📖 Tier 1: Prepare & Study Guide
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General Science Solved Questions Bank & Study Material (2026) - Apex Rankers
General Competitive Exams | Topic-Wise Comprehensive Solved Pool
501 Total Solved Questions
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32 Subject Areas / Chapters
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Q. 1
General Knowledge
Difficulty: Medium
(1 Mark)
Supersonic planes fly at a speed:
A
Less than the speed of sound
B
Equal to the speed of sound
C
More than the speed of sound
✓ Correct
D
Equal to the speed of light
💡
Step-by-Step Explanation & Concept Rationale
"Supersonic" describes speeds that exceed the speed of sound (Mach 1) in a given medium.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Which is the first chemical fertilizer?
A
Super phosphate
✓ Correct
B
Ammonium nitrate
C
Potassium sulphate
D
Ammonium nitrite
💡
Step-by-Step Explanation & Concept Rationale
Single superphosphate, produced from phosphate rock and sulfuric acid, was the first commercial chemical fertilizer.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
Herbicides are used for the elimination of:
A
Plant diseases
B
Pests
C
Weeds
✓ Correct
D
Insects
💡
Step-by-Step Explanation & Concept Rationale
Herbicides are a specific type of pesticide designed to kill unwanted plants or weeds.
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
If there is high rainfall... sunshine... and well-drained soil, which... crops would thrive most?
A
Rice
B
Sugarcane
C
Tea
✓ Correct
D
Jute
💡
Step-by-Step Explanation & Concept Rationale
Tea cultivation specifically requires high rainfall and well-drained sloping soil to prevent waterlogging.
Q. 4
General Knowledge
Difficulty: Easy
(1 Mark)
The primary objective of green revolution in Pakistan was:
A
Equitable distribution...
B
Provision of better seeds...
C
Modernization of agriculture...
✓ Correct
D
Abolition of bounded labour
💡
Step-by-Step Explanation & Concept Rationale
The Green Revolution focused on increasing crop yields through high-yielding varieties, irrigation, and chemical fertilizers.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Cytochrome contains:
A
Magnesium
B
Iron
✓ Correct
C
Copper
D
Calcium
💡
Step-by-Step Explanation & Concept Rationale
Cytochromes are hemeproteins containing iron atoms that facilitate electron transfer in cellular respiration.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
The drugs caffeine, tannin and nicotine are:
A
Steroids
B
Cortisones
C
Alkaloids
✓ Correct
D
Mild alkalis
💡
Step-by-Step Explanation & Concept Rationale
Alkaloids are a group of naturally occurring organic compounds that contain mostly basic nitrogen atoms and have physiological effects on humans.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
The type of crop which is able to fix nitrogen from air is known as:
A
Tuber
B
Coffee
C
Legume
✓ Correct
D
Wheat
💡
Step-by-Step Explanation & Concept Rationale
Legumes (like peas and beans) have a symbiotic relationship with Rhizobium bacteria in their root nodules that convert atmospheric nitrogen into a usable form.
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
The saliva helps in the digestion of:
A
Starch
✓ Correct
B
Proteins
C
Fibres
D
Fats
💡
Step-by-Step Explanation & Concept Rationale
Saliva contains the enzyme amylase (ptyalin), which begins the chemical breakdown of complex starches into simpler sugars like maltose.
Q. 4
General Knowledge
Difficulty: Easy
(1 Mark)
Amniocentesis is a method for:
A
Determination of foetal sex
✓ Correct
B
Separation of amino acids
C
Determination of the sequence of amino acids in a protein
D
Inducing abortion
💡
Step-by-Step Explanation & Concept Rationale
While used to detect genetic abnormalities, amniocentesis allows for the analysis of foetal chromosomes, which reveals the sex of the child.
Q. 5
General Knowledge
Difficulty: Easy
(1 Mark)
A recently developed technique for monitoring foetal growth uses:
A
X-rays
B
Microwaves
C
Ultrasonic
✓ Correct
D
Ultraviolet rays
💡
Step-by-Step Explanation & Concept Rationale
Medical ultrasonography uses high-frequency sound waves to create images of the foetus, as it is non-ionizing and safe for prenatal care.
Q. 6
General Knowledge
Difficulty: Easy
(1 Mark)
If there were no organic life on the Earth, the amount of oxygen in the atmosphere will:
A
Remain unchanged
B
Be approximately hundred per cent
C
Be almost nil
✓ Correct
D
Be approximately fifty per cent
💡
Step-by-Step Explanation & Concept Rationale
Nearly all atmospheric oxygen is a byproduct of photosynthesis performed by living organisms over billions of years.
Q. 7
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is not an element of the bone?
A
Calcium
B
Phosphorus
C
Carbon
✓ Correct
D
Oxygen
💡
Step-by-Step Explanation & Concept Rationale
Note: While bone contains organic carbon, the key (c) identifies it as the "non-mineral" element compared to the primary inorganic constituents.
Q. 8
General Knowledge
Difficulty: Easy
(1 Mark)
Inspection and dissection of a body after death... is called:
A
Autopsy
✓ Correct
B
Autotomy
C
Autoesism
D
Autograft
💡
Step-by-Step Explanation & Concept Rationale
An autopsy is a highly specialized surgical procedure that consists of a thorough examination of a corpse to determine the cause of death.
Q. 9
General Knowledge
Difficulty: Easy
(1 Mark)
The bulkiest muscle in the human body is found in:
A
Legs
B
Hands
C
Hip
✓ Correct
D
Neck
💡
Step-by-Step Explanation & Concept Rationale
The gluteus maximus, located in the hip/buttocks, is the largest and heaviest muscle in the human body.
Q. 10
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following trees grows the fastest?
A
Coconut
B
Palm
C
Mango
D
Bamboo
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Some species of bamboo are the fastest-growing plants on Earth, with growth rates of up to 91 cm (36 in) in a 24-hour period.
Q. 11
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is not a contagious disease?
A
Measles
B
Hysteria
✓ Correct
C
Typhoid
D
Influenza
💡
Step-by-Step Explanation & Concept Rationale
Contagious diseases are spread by pathogens; hysteria is a psychological or neurological condition and is not infectious.
Q. 12
General Knowledge
Difficulty: Easy
(1 Mark)
‘Pasteurized Milk’ is:
A
Specially treated milk in order to kill bacteria
✓ Correct
B
Milk mixed with protein rich powder
C
Milk rich in fats
D
Medicated milk for children
💡
Step-by-Step Explanation & Concept Rationale
Pasteurization involves heating milk to a specific temperature for a set time to eliminate pathogens and extend shelf life.
Q. 13
General Knowledge
Difficulty: Easy
(1 Mark)
Deficiency of vitamin C causes:
A
Night-blindness
B
Beri-Beri
C
Scurvy
✓ Correct
D
Rickets
💡
Step-by-Step Explanation & Concept Rationale
Scurvy results from a lack of Vitamin C (ascorbic acid), which is essential for the synthesis of collagen in humans.
Q. 14
General Knowledge
Difficulty: Easy
(1 Mark)
Hydrophobia is related to:
A
Rabies
✓ Correct
B
Hepatitis
C
Yellow fever
D
Tetanus
💡
Step-by-Step Explanation & Concept Rationale
Hydrophobia (fear of water) is a characteristic symptom of the later stages of a rabies infection in humans.
Q. 15
General Knowledge
Difficulty: Easy
(1 Mark)
The Bacteriophages are:
A
Virus that attacks bacteria
✓ Correct
B
Virus that attacks insect
C
Bacteria that attacks plant
D
Bacteria that attacks insect
💡
Step-by-Step Explanation & Concept Rationale
Bacteriophages (phages) are viruses that infect and replicate within bacteria and archaea.
Q. 16
General Knowledge
Difficulty: Easy
(1 Mark)
Silkworm eats:
A
Mango
B
Mangrove
C
Strawberry
D
Mulberry
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
The larvae of the domestic silkmoth (Bombyx mori) feed exclusively on the leaves of white mulberry trees.
Q. 17
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following birds is a flightless bird?
A
Emu
✓ Correct
B
Hen
C
Swan
D
None of these
💡
Step-by-Step Explanation & Concept Rationale
The emu is a large, flightless ratite native to Australia; while hens have limited flight, the emu is biologically incapable of it.
Q. 18
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is an oxygen carrier?
A
R.B.C.
✓ Correct
B
R.B.C. and Plasma
C
R.B.C. and W.B.C.
D
R.B.C. W.B.C. and Plasma
💡
Step-by-Step Explanation & Concept Rationale
Red Blood Cells contain hemoglobin, the iron-rich protein that binds to and transports oxygen throughout the body.
Q. 19
General Knowledge
Difficulty: Medium
(1 Mark)
What does blood consist of:
A
60% plasma, 40% corpuscles
✓ Correct
B
40% plasma, 60% corpuscles
C
25% plasma, 75% corpuscles
D
90% plasma, 10% corpuscles
💡
Step-by-Step Explanation & Concept Rationale
Human blood typically consists of roughly 55-60% liquid plasma and 40-45% formed elements like red and white cells.
Q. 20
General Knowledge
Difficulty: Easy
(1 Mark)
Pituitary gland is located just below the:
A
Brain
✓ Correct
B
Heart
C
Liver
D
Kidney
💡
Step-by-Step Explanation & Concept Rationale
The pituitary (master gland) is located at the base of the brain, seated in a bony hollow called the sella turcica.
Q. 21
General Knowledge
Difficulty: Easy
(1 Mark)
What is the normal process of losing heat?
A
Exhaling warm air
B
Excretion
C
By producing the sweat
✓ Correct
D
Food and liquid gets warmed up
💡
Step-by-Step Explanation & Concept Rationale
Sweat production (evaporative cooling) is the human body's primary physiological mechanism for dissipating excess heat.
Q. 22
General Knowledge
Difficulty: Easy
(1 Mark)
What is necessary for photosynthesis?
A
CO2, sunlight, carbohydrates, water
B
Oxygen, CO2, sunlight
C
Water, CO2, chlorophyll, sunlight
✓ Correct
D
Chlorophyll, oxygen, carbohydrates
💡
Step-by-Step Explanation & Concept Rationale
Photosynthesis is the process where plants use sunlight, water, and carbon dioxide to create energy (glucose) and oxygen.
Q. 23
General Knowledge
Difficulty: Easy
(1 Mark)
‘Parasexual’ means the fusion of:
A
Cytoplasm
B
Hybridization by protoplasms
C
Nucleus
✓ Correct
D
Choloroplasm
💡
Step-by-Step Explanation & Concept Rationale
The parasexual cycle is a non-meiotic mechanism for transferring genetic material, involving the fusion of nuclei (karyogamy).
Q. 24
General Knowledge
Difficulty: Medium
(1 Mark)
Which... is not a function of blood in human body?
A
To supply oxygen to organs
B
To maintain the body temperature
C
To remove waste products from the body
D
All the above are functions of blood
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Blood serves as a transport medium for gases and waste, and acts as a central regulator of body temperature.
Q. 25
General Knowledge
Difficulty: Easy
(1 Mark)
Rose propagation is done by:
A
Cutting
✓ Correct
B
Budding
C
Seeding
D
Plantation
💡
Step-by-Step Explanation & Concept Rationale
While roses can be seeded, vegetative propagation via stem cuttings is the standard method for cloning specific varieties.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
The wood largely used for railway sleepers is:
A
Sundari
B
Deodhar
✓ Correct
C
Toona
D
Sal
💡
Step-by-Step Explanation & Concept Rationale
Deodar cedar wood is durable, rot-resistant, and historically preferred for railway sleepers in South Asia.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
The age of a tree can be determined more or less accurately by:
A
Counting the number of branches
B
Measuring the height of the tree
C
Counting the number of annual rings...
✓ Correct
D
Measuring the diameter of the trunk
💡
Step-by-Step Explanation & Concept Rationale
Dendrochronology is the science of dating tree growth rings to determine the age of the specimen.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Energy transfers of Kreb’s cycle and electron transport chain takes place in:
A
Lysosomes
B
Cytoplasm
C
Mitochondria
✓ Correct
D
Chloroplasts
💡
Step-by-Step Explanation & Concept Rationale
Mitochondria are the cellular organelles where the Krebs cycle and Electron Transport Chain occur to produce ATP.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
The most abundant element in the earth’s crust is:
A
Oxygen
✓ Correct
B
Aluminum
C
Iron
D
Silicon
💡
Step-by-Step Explanation & Concept Rationale
Oxygen is the most abundant element in the Earth's crust by mass, accounting for approximately 46.6%.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
Which one of the following is a non-metallic mineral?
A
Manganese
B
Magnesium
C
Gypsum
✓ Correct
D
Bauxite
💡
Step-by-Step Explanation & Concept Rationale
Gypsum is a soft sulfate mineral; Manganese, Magnesium, and Bauxite are either metals or ores from which metals are extracted.
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
Which... chemicals in automobile exhaust can cause cancer?
A
Carbon monoxide
B
Polycyclic hydrocarbons
✓ Correct
C
Lead
D
Oxides of nitrogen
💡
Step-by-Step Explanation & Concept Rationale
PAHs are potent atmospheric pollutants and known carcinogens produced by the incomplete combustion of organic matter like fuel.
Q. 4
General Knowledge
Difficulty: Easy
(1 Mark)
Acid rain is caused by pollution of environment by:
A
Carbon dioxide and nitrogen
B
Carbon monoxide and carbon dioxide
C
Ozone and carbon dioxide
D
Nitrous oxide and sulphur dioxide
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
These gases react with water, oxygen, and other chemicals in the atmosphere to form sulfuric and nitric acids.
Q. 5
General Knowledge
Difficulty: Easy
(1 Mark)
Galvanised iron is iron coated with
A
Gold
B
Silver
C
Zinc
✓ Correct
D
None of the above
💡
Step-by-Step Explanation & Concept Rationale
Galvanization is the process of applying a protective zinc coating to steel or iron to prevent rusting and corrosion.
Q. 6
General Knowledge
Difficulty: Easy
(1 Mark)
Sucrose on hydrolysis with dilute acids give:
A
Glucose and lactose
B
Glucose and fructose
✓ Correct
C
Lactose and fructose
D
Glucose and galactose
💡
Step-by-Step Explanation & Concept Rationale
Sucrose is a disaccharide that breaks down into its constituent monosaccharides—glucose and fructose—during hydrolysis.
Q. 7
General Knowledge
Difficulty: Easy
(1 Mark)
Bagasse, a by-product of sugar manufacturing industry, is used for the production of:
A
Paper
✓ Correct
B
Alcohol
C
Confectioneries
D
Glass
💡
Step-by-Step Explanation & Concept Rationale
Bagasse is the dry pulpy fibrous residue that remains after sugarcane stalks are crushed, used extensively as a paper pulp source.
Q. 8
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is the most stable element?
A
Hydrogen
B
Oxygen
C
Lead
✓ Correct
D
Uranium
💡
Step-by-Step Explanation & Concept Rationale
Lead is the final, stable product of several radioactive decay chains, making it one of the most nuclear-stable heavy elements.
Q. 9
General Knowledge
Difficulty: Easy
(1 Mark)
Bauxite is:
A
Aluminum oxide \(Al_{2}O_{3}\)
B
Hydrated aluminum oxide \(Al_{2}O_{3}\)⋅x\(H_{2}O\)
✓ Correct
C
A mixture of oxides of Al, Fe and Si
D
Aluminum fluoride AlF
💡
Step-by-Step Explanation & Concept Rationale
Bauxite is a naturally occurring heterogeneous sedimentary rock that serves as the principal ore for extracting aluminum. Chemically, its primary component consists of various aluminum hydroxide minerals (such as gibbsite, boehmite, and diaspore), which are collectively represented by the general formula for hydrated aluminum oxide.
Q. 10
General Knowledge
Difficulty: Easy
(1 Mark)
The group of metals Fe, Co, Ni may be best called as:
A
Alkali metals
B
Rare metals
C
Main group metals
D
Transition metals
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Iron (Fe), Cobalt (Co), and Nickel (Ni) are located in the d-block of the periodic table and are classic transition metals.
Q. 11
General Knowledge
Difficulty: Easy
(1 Mark)
Aqua regia is concentrated HNO3 : concentrated HCl:
A
0.043055555555555555
B
0.04236111111111111
C
0.04375
✓ Correct
D
0.044444444444444446
💡
Step-by-Step Explanation & Concept Rationale
Aqua regia (royal water) is a highly corrosive mixture made of one part nitric acid and three parts hydrochloric acid.
Q. 12
General Knowledge
Difficulty: Medium
(1 Mark)
Which... laws is explained by the statement that matter can neither be created nor destroyed?
A
Law of Conservation of Energy
B
Law of Conservation of Mass
✓ Correct
C
Le Chatelier’s Principle
D
Law of Osmosis
💡
Step-by-Step Explanation & Concept Rationale
This fundamental principle states that the total mass of substances in a closed system remains constant during a chemical reaction.
Q. 13
General Knowledge
Difficulty: Easy
(1 Mark)
A lighted candle gets extinguished when covered with a tumbler because of:
A
Presence of non-luminous matter
B
Adequate supply of air
C
Inadequate supply of air
✓ Correct
D
None of the above
💡
Step-by-Step Explanation & Concept Rationale
Combustion requires oxygen; once the oxygen inside the tumbler is consumed, the chemical reaction stops and the flame dies.
Q. 14
General Knowledge
Difficulty: Easy
(1 Mark)
What is the best explanation for hard water?
A
It is heavy
B
It is viscous
C
Soap lathers profusely in it
D
It contains some calcium or magnesium salts
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Hard water is formed when water percolates through deposits of limestone, chalk, or gypsum, dissolving these minerals.
Q. 15
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following gases is used in fire extinguisher?
A
Carbon monoxide
B
Carbon dioxide
✓ Correct
C
Sulphur dioxide
D
Nitrogen
💡
Step-by-Step Explanation & Concept Rationale
CO2 is used because it is non-flammable and heavier than air, effectively smothering the fire by displacing oxygen.
Q. 16
General Knowledge
Difficulty: Easy
(1 Mark)
Excessive chlorination leads to pollution of water by producing:
A
Hydrochloric acid
✓ Correct
B
Hydrochlorine
C
Sodium chloride
D
None of the above
💡
Step-by-Step Explanation & Concept Rationale
When chlorine gas (\(\text{Cl}_{2}\)) is dissolved in water, it undergoes a disproportionation reaction to form hydrochloric acid (\(\text{HCl}\)) and hypochlorous acid (\(\text{HOCl}\)). Excessive chlorination overproduces these acids, causing a steep drop in the water's pH (making it highly acidic and corrosive) and creating secondary pollutant byproducts.
Q. 17
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is a chemical change?
A
Melting of iron
B
Bending of iron
C
Rusting of iron
✓ Correct
D
Tempering of iron
💡
Step-by-Step Explanation & Concept Rationale
Rusting is an oxidation reaction that changes iron into a new chemical substance, iron oxide.
Q. 18
General Knowledge
Difficulty: Easy
(1 Mark)
Mixture of water and alcohol can be separated by:
A
Filtration
B
Distillation
✓ Correct
C
Sublimation
D
Chromatography
💡
Step-by-Step Explanation & Concept Rationale
Distillation relies on the different boiling points of water (100∘C) and ethanol (78∘C) to separate them.
Q. 19
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is used as a food preservative?
A
Sodium benzoate
✓ Correct
B
Sodium perborate
C
Citric acid
D
None of the above
💡
Step-by-Step Explanation & Concept Rationale
Sodium benzoate is widely used to inhibit the growth of mold, yeast, and some bacteria in acidic food products.
Q. 20
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is not a by-product of coal gas?
A
Coke
B
Coal-tar
C
Sulphuric acid
D
Cobalt
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Coke, coal tar, and ammonia are primary byproducts of coal carbonization; Cobalt is an elemental metal.
Q. 21
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is a gaseous pollutant?
A
Lead
B
Hydrogen chloride
✓ Correct
C
Sodium chloride
D
Dust
💡
Step-by-Step Explanation & Concept Rationale
Hydrogen chloride (HCl) is a colorless gas with a pungent odor that acts as an atmospheric pollutant in industrial areas.
Q. 22
General Knowledge
Difficulty: Easy
(1 Mark)
The best antiknock compound used in petrol to increase mileage is:
A
Ethyl magnesium chloride
B
Sodium ethoxide
C
Zinc ethyl
D
Tetraethyl lead
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
TEL was widely used as a gasoline additive to reduce engine "knocking" by raising the octane rating.
Q. 23
General Knowledge
Difficulty: Easy
(1 Mark)
Liquefied petroleum gas consists of mainly:
A
Methane, Butane and Propane
✓ Correct
B
Methane, Ethane and Hexane
C
Ethane, Hexane and Nonane
D
None of the above
💡
Step-by-Step Explanation & Concept Rationale
LPG is a flammable mixture of hydrocarbon gases, primarily containing propane and butane.
Q. 24
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is not a chemical change?
A
Heating coal
B
Making curd from milk
C
Converting water into steam
✓ Correct
D
Rusting of iron
💡
Step-by-Step Explanation & Concept Rationale
Boiling water is a physical change (change of state), whereas the others involve the creation of new chemical substances.
Q. 25
General Knowledge
Difficulty: Easy
(1 Mark)
None-stick kitchenware is coated with:
A
Glass
B
Graphite
C
Teflon
✓ Correct
D
Silicon
💡
Step-by-Step Explanation & Concept Rationale
Teflon (polytetrafluoroethylene) is used for its extremely low friction and non-reactive properties.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
What is the latest means of communication?
A
Fibre optics
B
Laser
C
Superconductivity
D
(a) and (c)
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Fibre optics and superconductivity-based technologies represent the cutting edge of modern communication infrastructure.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Sunderbans is the name of:
A
Deciduous forest
B
Smei evergreen forest
C
Tropical forest
D
Tidal forest
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
The Sundarbans is a vast mangrove area (tidal halophytic forest) in the Ganges-Brahmaputra delta.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
Lichens and Mosses are the characteristic vegetation of:
A
Mediterranean region
B
Temperate region
C
Tundra region
✓ Correct
D
Hot desert region
💡
Step-by-Step Explanation & Concept Rationale
Mosses and lichens are organisms adapted to the extreme cold and short growing seasons of the Arctic tundra.
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
All the following contribute to pollution except:
A
Thermal power plants
B
Automobiles
C
Nuclear power plants
D
Hydro-electric power project
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Hydroelectric projects are a source of clean energy that does not emit atmospheric pollutants during generation.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Of the following, which provides the maximum amount of energy in the present day world?
A
Hydroelectric power resources
B
Coal
C
Liquid fuels
✓ Correct
D
Atomic energy
💡
Step-by-Step Explanation & Concept Rationale
Liquid fuels (primarily petroleum and crude oil) provide the largest percentage of global primary energy consumption. They dominate the global transportation sector (gasoline, diesel, and jet fuel) and serve as a vital baseline for industrial power, comfortably outpacing all other energy resources.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Hygrometer is used for measuring the
A
Speed of sound
B
Density of milk
C
Humidity of air
✓ Correct
D
Specific gravity of liquids
💡
Step-by-Step Explanation & Concept Rationale
A hygrometer is a weather instrument used to measure the amount of water vapor (humidity) in the atmosphere.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is a non-metal?
A
Mercury
B
Magnesium
C
Manganese
D
Silicon
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Silicon is a chemical element with the symbol Si and atomic number 14; it is classified as a metalloid/non-metal.
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following pairs is not correct?
A
Barometer – Torricelli
B
Telescope – Galileo
C
Aeroplane – Wright brothers
D
Bicycle – Edison
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Thomas Edison invented the incandescent light bulb and phonograph, while the bicycle was developed by others like Kirkpatrick Macmillan.
Q. 4
General Knowledge
Difficulty: Medium
(1 Mark)
Which of the following vitamins is associated with coagulation of blood?
A
Vitamin A
B
Vitamin B
C
Vitamin E
D
Vitamin K
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Vitamin K is essential for the synthesis of proteins required for blood clotting (coagulation).
Q. 5
General Knowledge
Difficulty: Easy
(1 Mark)
Bauxite is an ore of:
A
Copper
B
Iron
C
Aluminum
✓ Correct
D
Manganese
💡
Step-by-Step Explanation & Concept Rationale
Bauxite is the world's main source of aluminum, containing aluminum oxides and hydroxides.
Q. 6
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is used in fire extinguishers?
A
Carbon sulphite
B
Carbon monoxide
C
Carbon dioxide
✓ Correct
D
Mixture of the gases
💡
Step-by-Step Explanation & Concept Rationale
CO2 is used because it is denser than air and does not support combustion, effectively smothering the fire.
Q. 7
General Knowledge
Difficulty: Easy
(1 Mark)
What is the normal rate of heart beat in human beings?
A
32 times per min.
B
42 times per min
C
62 times per min
D
72 times per min
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
A normal resting heart rate for adults ranges from 60 to 100 beats per minute, with 72 being the standard average.
Q. 8
General Knowledge
Difficulty: Medium
(1 Mark)
Universal blood donor belongs to the blood group
A
A
B
B
C
AB
D
O
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Group O-negative blood can be given to patients of any blood group because it lacks A, B, and Rh antigens.
Q. 9
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is entirely a plant product?
A
Lac
B
Resin
C
Agar-Agar
✓ Correct
D
Latex
💡
Step-by-Step Explanation & Concept Rationale
Agar-agar is a gelatinous substance derived from red algae (seaweed).
Q. 10
General Knowledge
Difficulty: Easy
(1 Mark)
In animals, the principal role of Vitamin E is
A
Respiration
B
Reproduction
✓ Correct
C
Digestion
D
Transpiration
💡
Step-by-Step Explanation & Concept Rationale
Vitamin E is essential for maintaining reproductive health and fertility in various animal species.
Q. 11
General Knowledge
Difficulty: Easy
(1 Mark)
Hereditary disorders are the result of
A
Defective DNA nucleus
✓ Correct
B
Lack of vitamin E
C
Defective RNA nucleus
D
None of these
💡
Step-by-Step Explanation & Concept Rationale
Genetic or hereditary disorders are caused by mutations or abnormalities in the DNA sequence within cell nuclei.
Q. 12
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following roofs provide better protection against heat?
A
Reinforced concrete
B
Asbestos sheets
✓ Correct
C
Cement slab
D
None of these
💡
Step-by-Step Explanation & Concept Rationale
Asbestos was historically used for roofing because of its excellent thermal insulation and heat-resistant properties.
Q. 13
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is not a vitamin?
A
Trypsin
✓ Correct
B
Ascorbic acid
C
Riboflavin
D
Niacinamide
💡
Step-by-Step Explanation & Concept Rationale
Trypsin is a digestive enzyme that breaks down proteins; the others are vitamins (C, B2, and B3).
Q. 14
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is not the colour in rainbow?
A
Black
✓ Correct
B
Blue
C
Indigo
D
Violet
💡
Step-by-Step Explanation & Concept Rationale
Black is the absence of visible light; the rainbow consists of Red, Orange, Yellow, Green, Blue, Indigo, and Violet.
Q. 15
General Knowledge
Difficulty: Easy
(1 Mark)
Oxidation results in ————
A
Gain of electrons
B
Loss of electrons
✓ Correct
C
Gain of protons
D
Loss of protons
💡
Step-by-Step Explanation & Concept Rationale
Oxidation is a chemical reaction involving the loss of electrons by a molecule, atom, or ion.
Q. 16
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following substances exhibit the property of sublimation?
A
Ice
B
Camphor
✓ Correct
C
Ethyl alcohol
D
Wax
💡
Step-by-Step Explanation & Concept Rationale
Sublimation is the transition of a substance directly from the solid to the gas state; camphor exhibits this.
Q. 17
General Knowledge
Difficulty: Easy
(1 Mark)
The layer of atmosphere which affords protection to human beings against solar ultraviolet radiation is:
A
Troposphere
B
Stratosphere
✓ Correct
C
Ionosphere
D
Exosphere
💡
Step-by-Step Explanation & Concept Rationale
The stratosphere contains the ozone layer, which absorbs most of the Sun's harmful ultraviolet radiation.
Q. 18
General Knowledge
Difficulty: Easy
(1 Mark)
Bronze is an alloy of
A
Copper and Zinc
B
Tin and Zinc
C
Copper and Tin
✓ Correct
D
Iron and Zinc
💡
Step-by-Step Explanation & Concept Rationale
Bronze is a metal alloy consisting primarily of copper, usually with tin as the main additive.
Q. 19
General Knowledge
Difficulty: Easy
(1 Mark)
An isotope of Uranium employed as fuel is
A
U-232
B
U-235
✓ Correct
C
U-238
D
U-240
💡
Step-by-Step Explanation & Concept Rationale
Uranium-235 is the fissile isotope used as the primary fuel for nuclear reactors and weapons.
Q. 20
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following are the Rabi crops?
A
Wheat, Rice, Mustard
B
Rice, Maize, Groundnut
C
Wheat, Barley, Mustard
✓ Correct
D
Barley, Mustard, Groundnut
💡
Step-by-Step Explanation & Concept Rationale
Rabi crops are sown in winter and harvested in spring; wheat, barley, and mustard are typical examples in South Asia.
Q. 21
General Knowledge
Difficulty: Easy
(1 Mark)
Gypsum salt is:
A
CaSO4⋅2H2O
✓ Correct
B
CaSO4⋅H2O
C
2CaSO4⋅H2O
D
CaSO4⋅5H2O
💡
Step-by-Step Explanation & Concept Rationale
Gypsum is a soft sulfate mineral composed of calcium sulfate dihydrate.
Q. 22
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is most important ore of aluminum?
A
Hematite
B
Bauxite
✓ Correct
C
Limestone
D
Bronze
💡
Step-by-Step Explanation & Concept Rationale
Bauxite is the primary commercial ore from which aluminum is extracted.
Q. 23
General Knowledge
Difficulty: Easy
(1 Mark)
Earth’s crust have the abundant reserves of ———
A
Iron, Silicon and Oxygen
B
Silicon, Nitrogen and Aluminum
C
Silicon, Oxygen and Aluminum
✓ Correct
D
Iron, Silicon and Nitrogen
💡
Step-by-Step Explanation & Concept Rationale
These three elements are the most abundant in the Earth's crust by mass.
Q. 24
General Knowledge
Difficulty: Easy
(1 Mark)
Caustic soda is ———
A
Na2CO3
B
NaHCO3
C
NaOH
✓ Correct
D
NaCl
💡
Step-by-Step Explanation & Concept Rationale
Caustic soda is the common name for the inorganic compound sodium hydroxide.
Q. 25
General Knowledge
Difficulty: Easy
(1 Mark)
Pure gold is ———
A
17 carat
B
20 carat
C
24 carat
✓ Correct
D
36 carat
💡
Step-by-Step Explanation & Concept Rationale
Gold purity is measured in carats; 24-carat gold is 99.9% pure.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
The wet camel hair, when brushed, cling together due to:
A
Surface tension
✓ Correct
B
Viscosity
C
Elasticity
D
Adhesion
💡
Step-by-Step Explanation & Concept Rationale
Surface tension of the thin water film on the hairs pulls them toward each other when they are wet.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
The world environment day is celebrated on:
A
46119
B
46178
✓ Correct
C
46189
D
46240
💡
Step-by-Step Explanation & Concept Rationale
Led by the UNEP, World Environment Day has been celebrated annually on June 5th since 1973.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Oncogenes are:
A
Tumor inducing genes
✓ Correct
B
Ancestral genes
C
Genes inhibiting cell division
D
Genes present in a prokaryotic cells
💡
Step-by-Step Explanation & Concept Rationale
An oncogene is a gene that has the potential to cause cancer by promoting uncontrolled cell growth.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
The unit structure of which gene is made up of is:
A
DNA
B
Nucleotides
✓ Correct
C
Endoplasmic reticulum
D
RNA
💡
Step-by-Step Explanation & Concept Rationale
Genes are segments of DNA made up of sequences of nucleotides (adenine, guanine, cytosine, and thymine).
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following diseases is inheritable?
A
Colour blindness
✓ Correct
B
Malignancy
C
Hepatitis
D
Leukemia
💡
Step-by-Step Explanation & Concept Rationale
Red-green color blindness is a genetic disorder typically inherited as an X-linked recessive trait.
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Q. 1
General Knowledge
Difficulty: Medium
(1 Mark)
Which one of the following is not correctly matched?
A
Isopleths – A line joining places of equal height
✓ Correct
B
Isobar – A line joining places of equal pressure
C
Isohyets – A line joining places of equal rainfall
D
Isotherm – A line joining places of equal temperature
💡
Step-by-Step Explanation & Concept Rationale
Isopleths is a general term for lines of equal value; lines specifically joining points of equal height are called contours.
Q. 2
General Knowledge
Difficulty: Medium
(1 Mark)
Humidity in the air is maximum in:
A
Winter
B
Summer
C
Monsoon
✓ Correct
D
Autumn
💡
Step-by-Step Explanation & Concept Rationale
The monsoon season brings massive amounts of evaporated ocean water into the atmosphere, resulting in peak humidity levels.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
The size of the earth was first suggested by:
A
Hipparcus
B
Galileo
C
Ptolemy
D
Eratosthenes
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Eratosthenes of Cyrene first calculated the circumference of the Earth using the angle of the sun in approx. 240 BCE.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
Where was the first photograph taken?
A
France
✓ Correct
B
Italy
C
U.K.
D
Germany
💡
Step-by-Step Explanation & Concept Rationale
Joseph Nicéphore Niépce took the earliest surviving photograph in France during the 1820s.
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following pairs of discovery and discoverer is not correct?
A
Television – Baird
B
Transistor – Shockley
C
Typewriter – Sholes
D
Telephone – Morse
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Alexander Graham Bell invented the telephone; Samuel Morse invented the telegraph and Morse code.
Q. 4
General Knowledge
Difficulty: Easy
(1 Mark)
Which ancient civilization had the passion for writing big numbers?
A
Indian
✓ Correct
B
Chinese
C
Sumerian
D
Inca
💡
Step-by-Step Explanation & Concept Rationale
Ancient Indian mathematicians developed advanced notation systems for expressing very large numerical powers.
Q. 5
General Knowledge
Difficulty: Easy
(1 Mark)
The first Atom Bomb was dropped at:
A
Pearl Harbour
B
Nagasaki
C
Tokyo
D
Hiroshima
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
The first atomic bomb used in warfare was dropped on the Japanese city of Hiroshima on August 6, 1945.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
The gland, which in relation to body size is largest at birth and then gradually shrinks after puberty, is:
A
Pituitary
B
Adrenal
C
Thyroid
D
Thymus
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
The thymus is a primary lymphoid organ that is most active during childhood and undergoes atrophy (involution) after puberty.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Which is the language used to create web documents?
A
HTML
✓ Correct
B
UNIX
C
JAVA
D
C++
💡
Step-by-Step Explanation & Concept Rationale
HyperText Markup Language (HTML) is the standard markup language used for documents designed to be displayed in a web browser.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
Which is the most popular website name ending?
A
.edu
B
.com
✓ Correct
C
.net
D
.org
💡
Step-by-Step Explanation & Concept Rationale
".com" (commercial) is the most widely used top-level domain on the internet.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Microscope is used to:
A
Identify distant object
B
Destroy bacteria
C
Magnify very minute particles
✓ Correct
D
None of the above
💡
Step-by-Step Explanation & Concept Rationale
Microscopes use lenses to produce enlarged images of small objects that are otherwise invisible to the naked eye.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Who wrote the classic “What is Life”?
A
Charles Darwin
B
Erwin Schrodinger
✓ Correct
C
Werner Heisenberg
D
T.H. Huxley
💡
Step-by-Step Explanation & Concept Rationale
This influential 1944 book by physicist Erwin Schrödinger explores life's physical and biological mechanisms.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is not an alloy?
A
Bronze
B
Zinc
✓ Correct
C
Brass
D
Steel
💡
Step-by-Step Explanation & Concept Rationale
Zinc is a pure chemical element; Bronze, Brass, and Steel are mixtures of two or more metals (alloys).
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
Hardest substances is ————
A
Diamond
✓ Correct
B
Gold
C
Silver
D
Copper
💡
Step-by-Step Explanation & Concept Rationale
Diamond is an allotrope of carbon with a rigid crystal structure, making it the hardest natural material.
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
The newly discovered high temperature superconductors are –
A
Metal alloys
B
Pure rare – earth metals
C
Ceramic oxides
✓ Correct
D
Inorganic polymers
💡
Step-by-Step Explanation & Concept Rationale
High-temperature superconductors discovered in the late 1980s are typically complex ceramic materials.
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Q. 1
General Knowledge
Difficulty: Medium
(1 Mark)
A shell explodes and many pieces fly off in different directions. The following is conserved:
A
Kinetic energy
B
Momentum and kinetic energy
✓ Correct
C
Neither momentum nor kinetic energy
D
Momentum
💡
Step-by-Step Explanation & Concept Rationale
In an explosion where no external forces act, linear momentum is conserved, even as chemical energy converts to kinetic.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is not immunized by ‘Triple Antigen’?
A
Typhoid
✓ Correct
B
Whooping cough
C
Tetanus
D
Diphtheria
💡
Step-by-Step Explanation & Concept Rationale
Triple antigen (DPT) provides immunity against Diphtheria, Pertussis (whooping cough), and Tetanus, not Typhoid.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
‘Laparoscopy’ is associated with:
A
Family planning
✓ Correct
B
Leprosy control
C
Study of Leprosy
D
Pollution control
💡
Step-by-Step Explanation & Concept Rationale
Laparoscopy is a surgical procedure often used for tubal ligation, a method of permanent family planning.
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
Goitre is associated with:
A
Thyroid glands
✓ Correct
B
Pituitary glands
C
Para-thyroid glands
D
Thymus glands
💡
Step-by-Step Explanation & Concept Rationale
A goiter is an abnormal enlargement of the thyroid gland, typically caused by iodine deficiency.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Graphite and Sillimanite belongs to the category of:
A
Ferrous minerals
B
Fertilizer minerals
C
Refractory minerals
✓ Correct
D
Base minerals
💡
Step-by-Step Explanation & Concept Rationale
Refractory minerals like graphite can withstand very high temperatures without melting or decomposing.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
In an atomic nucleus, protons and neutrons are held together by:
A
Coulombic forces
B
Gravitational forces
C
Exchange forces
✓ Correct
D
Magnetic forces
💡
Step-by-Step Explanation & Concept Rationale
The strong nuclear force, mediated by the exchange of mesons, holds the nucleus together despite electrostatic repulsion.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
A moderator is used in nuclear Reactors in order to:
A
Slow down the speed of the neutrons
✓ Correct
B
Accelerate the neutrons
C
Increase the number of neutrons
D
Decrease the number of neutrons
💡
Step-by-Step Explanation & Concept Rationale
Moderators like heavy water or graphite slow fast neutrons to "thermal" speeds to sustain the fission reaction.
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
Neutron was discovered by:
A
Otto Hahn
B
Enrcico Fermi
C
Lise Meitner
D
James Chadwick
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
James Chadwick was awarded the Nobel Prize in Physics for his 1932 discovery of the neutron.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Of the following food, which is rich in protein and oil?
A
Red gram
B
Soyabean
✓ Correct
C
Moon gram
D
Cow peas
💡
Step-by-Step Explanation & Concept Rationale
Soybeans are unique among legumes for their high content of both complete protein and healthy oils.
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Q. 1
General Knowledge
Difficulty: Medium
(1 Mark)
We see the Sun a little before it rises... and a little after it sets... This is a consequence of:
A
Total internal reflection
B
Refraction
✓ Correct
C
Dispersion
D
Scattering of Sun’s light
💡
Step-by-Step Explanation & Concept Rationale
Atmospheric refraction bends sunlight toward Earth, making the Sun visible even when it is below the physical horizon.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
The stars twinkle in the night because:
A
They emit light intermittently
B
The earth’s atmosphere absorbs light...
C
The star’s atmosphere absorbs light...
D
The refractive index of the air... fluctuates.
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Twinkling is caused by light passing through atmospheric layers of varying densities and refractive indices.
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
Rainbow is produced by tiny raindrops... as a result of:
A
Reflection and interference
B
Refraction and dispersion
C
Interference
D
Reflection, refraction and dispersion
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Sunlight undergoes refraction and dispersion inside the drop, and reflection off the internal back surface.
Q. 4
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is the combination of the three primary colour used in colour TV?
A
Green – Yellow – Blue
B
Yellow – Blue – Red
C
Red – Green – Yellow
D
Green – Blue – Red
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Color televisions, computer monitors, and phone screens operate on the additive color model (specifically the RGB color model). This system creates different colors by projecting beams of light directly into your eyes. The three primary colors of light are Red, Green, and Blue. When mixed at different intensities, they can replicate virtually any color perceivable by the human eye (for example, mixing red and green light produces yellow light)
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Turpentine oil is produced from:
A
Animal fat
B
Eucalyptus tree
C
Pine tree
✓ Correct
D
Mineral oil
💡
Step-by-Step Explanation & Concept Rationale
Turpentine is a fluid obtained by the distillation of resin from live trees, mainly pines.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Ordinary dry air consists of the following:
A
Nitrogen
✓ Correct
B
Oxygen
C
Argon
D
Carbon dioxide
💡
Step-by-Step Explanation & Concept Rationale
Nitrogen is the most abundant gas in Earth's atmosphere, making up approximately 78% of dry air by volume.
Q. 2
General Knowledge
Difficulty: Medium
(1 Mark)
The resolving power of an electron microscope is much higher than that of an ordinary light microscope because...
A
If wavelength is short and wavelength of electron beam can be made quite small...
✓ Correct
B
If wavelength is short and light given by electrons has very short wavelength
C
If magnification is high and electronic lens provides much higher magnification
D
If magnification is high and the electron microscope has a battery of lenses...
💡
Step-by-Step Explanation & Concept Rationale
Resolution is inversely proportional to wavelength; electrons have much shorter de Broglie wavelengths than photons of visible light, allowing for higher resolution.
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
On the Moon, astronauts inflate a rubber balloon with hydrogen gas and release it at a height of 2 meters. The balloon will:
A
Fall down
✓ Correct
B
Go upwards
C
Remain at the height of 2 meters
D
First go up and finally come down
💡
Step-by-Step Explanation & Concept Rationale
Since the Moon has no atmosphere, there is no air displacement or buoyant force to make the balloon float; gravity will cause it to fall.
Q. 4
General Knowledge
Difficulty: Easy
(1 Mark)
Nights are cooler in the deserts because:
A
Sand radiates heat less quickly as compared to the earth
B
Sand radiates heat more quickly as compared to the earth
✓ Correct
C
The sky is generally clear
D
The sky is generally cloudy
💡
Step-by-Step Explanation & Concept Rationale
Sand has a low specific heat capacity and high emissivity, meaning it absorbs heat rapidly during the day and loses it just as quickly at night.
Q. 5
General Knowledge
Difficulty: Easy
(1 Mark)
If there were no atmosphere, what would be the colour of sky?
A
White
B
Black
✓ Correct
C
Blue
D
Red
💡
Step-by-Step Explanation & Concept Rationale
The sky appears blue due to the scattering of sunlight by atmospheric gases (Rayleigh scattering); without air, no scattering occurs, leaving the sky dark.
Q. 6
General Knowledge
Difficulty: Easy
(1 Mark)
Ice skating can be used to demonstrate that when ice is under pressure, its:
A
Melting point is lowered
✓ Correct
B
Melting point is raised
C
Melting point remains unchanged
D
Coefficient of friction with metal is reduced
💡
Step-by-Step Explanation & Concept Rationale
This phenomenon (regelation) allows a thin layer of water to form under the skate blade, acting as a lubricant.
Q. 7
General Knowledge
Difficulty: Easy
(1 Mark)
Who was the first to measure earth’s radius?
A
Galileo
B
Copernicus
C
Ptolemy
D
Eratosthenes
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
The Greek mathematician Eratosthenes calculated the Earth's circumference and radius with remarkable accuracy around 240 BCE.
Q. 8
General Knowledge
Difficulty: Easy
(1 Mark)
Light travels in:
A
Longitudinal waves
B
Transverse waves
✓ Correct
C
Both of the above
D
None of above
💡
Step-by-Step Explanation & Concept Rationale
Light is an electromagnetic wave where the electric and magnetic fields oscillate perpendicular to the direction of wave travel.
Q. 9
General Knowledge
Difficulty: Easy
(1 Mark)
Ozone layer prevents which of the radiation from entering the atmosphere?
A
Infra-red
B
Ultraviolet
✓ Correct
C
X-rays
D
Gamma rays
💡
Step-by-Step Explanation & Concept Rationale
The ozone layer in the stratosphere absorbs approximately 98% of the Sun's medium-frequency ultraviolet light.
Q. 10
General Knowledge
Difficulty: Easy
(1 Mark)
Due to air pollution there is a gradual warming up of air. This is called:
A
Photosynthesis
B
Green house effect
✓ Correct
C
Air heating
D
Air pollution
💡
Step-by-Step Explanation & Concept Rationale
The trapping of the sun's warmth in the lower atmosphere due to greenhouse gases is the driver of global warming.
Q. 11
General Knowledge
Difficulty: Easy
(1 Mark)
The phenomenon of Aurora Borealis... display of red and green lights... is due to the radiations from:
A
Ionosphere
✓ Correct
B
Troposphere
C
Mesosphere
D
Stratosphere
💡
Step-by-Step Explanation & Concept Rationale
Auroras are caused by collisions between solar wind particles and oxygen/nitrogen atoms in the high-altitude ionosphere.
Q. 12
General Knowledge
Difficulty: Easy
(1 Mark)
When water boils, its temperature:
A
Begins to increase
B
Begins to decrease
C
Remains constant
✓ Correct
D
Fluctuates around a value
💡
Step-by-Step Explanation & Concept Rationale
At the boiling point, added thermal energy is used as latent heat to overcome molecular bonds (evaporation) rather than raising temperature.
Q. 13
General Knowledge
Difficulty: Easy
(1 Mark)
The term that best describes the shape of the earth is:
A
Geoid
✓ Correct
B
Sphere
C
Globe
D
Ellipse
💡
Step-by-Step Explanation & Concept Rationale
The Earth's shape is specifically an oblate spheroid, often referred to as a geoid to account for local gravity variations.
Q. 14
General Knowledge
Difficulty: Easy
(1 Mark)
The lunar eclipse occurs when:
A
Moon is between the earth and the sun
B
Earth is between the sun and the moon
✓ Correct
C
Sun is between the earth and the moon
D
Earth is at right angles to the direction of the sun and the moon
💡
Step-by-Step Explanation & Concept Rationale
A lunar eclipse happens when the Earth moves between the Sun and the Moon, casting its shadow on the lunar surface.
Q. 15
General Knowledge
Difficulty: Medium
(1 Mark)
The correct sequence of various regions in absorption spectrum is:
A
Infra-red, gamma rays, ultraviolet, microwave
B
Microwave, visible, infra-red, X-rays
C
Ultraviolet, visible, infra-red, microwave
✓ Correct
D
Visible, ultraviolet, microwave, infra-red
💡
Step-by-Step Explanation & Concept Rationale
This sequence follows the electromagnetic spectrum in order of increasing wavelength and decreasing frequency/energy.
Q. 16
General Knowledge
Difficulty: Easy
(1 Mark)
Days and nights are caused by: (1) Rotation of the earth... (2) Revolution of the earth... (3) Inclination of the earth's axis
A
All are correct
B
1 and 2 are correct
✓ Correct
C
2 and 3 are correct
D
Only 1 is correct
💡
Step-by-Step Explanation & Concept Rationale
Note: While rotation is the primary cause, the key (b) includes revolution; revolution and inclination primarily cause seasonal changes.
Q. 17
General Knowledge
Difficulty: Easy
(1 Mark)
Chain reaction in a nuclear reactor is controlled by:
A
Moderator
✓ Correct
B
Ions
C
Molecules of high energy
D
None of these
💡
Step-by-Step Explanation & Concept Rationale
While control rods capture neutrons, a moderator is used to slow down neutrons to ensure the chain reaction remains sustainable.
Q. 18
General Knowledge
Difficulty: Easy
(1 Mark)
As the altitude increases, the temperature decreases at the rate of 1∘C for every:
A
200 feet
B
300 feet
✓ Correct
C
400 feet
D
450 feet
💡
Step-by-Step Explanation & Concept Rationale
This is the standard environmental lapse rate in the troposphere (roughly 6.5∘C per 1000 meters).
Q. 19
General Knowledge
Difficulty: Easy
(1 Mark)
Rate of heating and cooling of land and water is different because: 1. specific heats 2. water is mobile 3. water is transparent
A
Only 1
B
Only 2
C
1 and 3
D
1, 2 and 3
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
All three factors contribute to the thermal inertia of water compared to the rapid heating and cooling of land.
Q. 20
General Knowledge
Difficulty: Easy
(1 Mark)
X-rays and y-rays are able to destroy the living tissues by the process of:
A
Ionization
✓ Correct
B
Scattering
C
Oxidation
D
Electrolysis
💡
Step-by-Step Explanation & Concept Rationale
These high-energy rays are ionizing radiation, meaning they strip electrons from atoms, damaging DNA and cellular structures.
Q. 21
General Knowledge
Difficulty: Easy
(1 Mark)
Water has maximum density at:
A
Room temperature
B
0∘
C
4∘
✓ Correct
D
100∘
💡
Step-by-Step Explanation & Concept Rationale
Water is most dense at 4∘C (39.2∘F); as it cools further toward freezing, it expands and becomes less dense.
Q. 22
General Knowledge
Difficulty: Easy
(1 Mark)
The non-conventional source(s) of energy is/are: (1) Biogas (2) Geothermal (3) Lignite
A
True
B
1 and 2
✓ Correct
C
2 and 3
D
1, 2 and 3
💡
Step-by-Step Explanation & Concept Rationale
(1) Biogas: This is a non-conventional source of energy. It is a renewable, eco-friendly energy resource produced from the anaerobic decomposition of organic matter (such as agricultural waste and manure).
(2) Geothermal: This is also a non-conventional source of energy. It taps into the natural, infinite heat generated within the Earth's crust, making it a completely renewable alternative to fossil fuels.
(2) Geothermal: This is also a non-conventional source of energy. It taps into the natural, infinite heat generated within the Earth's crust, making it a completely renewable alternative to fossil fuels.
Q. 23
General Knowledge
Difficulty: Easy
(1 Mark)
Decibel is a unit of measuring
A
Heat
B
Sound
✓ Correct
C
Weight
D
Light
💡
Step-by-Step Explanation & Concept Rationale
The decibel (dB) is a relative unit of measurement used to express the ratio of one value of a physical property (usually intensity) to another.
Q. 24
General Knowledge
Difficulty: Easy
(1 Mark)
‘Mica’ is extensively used in the manufacture of:
A
Alcohol
B
Electric appliances
✓ Correct
C
Laminates
D
Plastic
💡
Step-by-Step Explanation & Concept Rationale
Mica is an excellent electrical insulator and thermal conductor, making it ideal for use in high-voltage equipment and heaters.
Q. 25
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is the distinctive property of a superconductor?
A
It is not ductile
B
It can store electricity
C
It carries electricity very fast
D
It offers almost zero resistance to electric current
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Superconductivity is a state where a material can conduct electricity with zero energy loss below a critical temperature.
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Q. 1
General Knowledge
Difficulty: Medium
(1 Mark)
Respiratory quotient is the ratio of:
A
CO2/H2O
B
O2/H2O
C
CO2/O2
✓ Correct
D
O2/CO2
💡
Step-by-Step Explanation & Concept Rationale
The Respiratory Quotient (RQ) is the ratio of the volume of carbon dioxide produced to the volume of oxygen consumed.
Q. 2
General Knowledge
Difficulty: Easy
(1 Mark)
Pancreas secretes hormones, which helps in:
A
Growth of body
B
Blood clotting
C
Keeping sugar balance in body
✓ Correct
D
Production of anti-bodies
💡
Step-by-Step Explanation & Concept Rationale
The pancreas secretes insulin and glucagon, which regulate glucose levels in the bloodstream.
Q. 3
General Knowledge
Difficulty: Easy
(1 Mark)
The hormone that increases the rate of heart beat... after shock in a person is:
A
Pancreatin
B
Adrenalin
✓ Correct
C
Thyroxin
D
Gastrin
💡
Step-by-Step Explanation & Concept Rationale
Adrenaline (epinephrine) is the "fight or flight" hormone that increases heart rate and blood pressure during stress.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Which of the following is commonly called a “Polyamide”?
A
Rayon
B
Nylon
✓ Correct
C
Terylene
D
Orlon
💡
Step-by-Step Explanation & Concept Rationale
Nylons are synthetic polymers characterized by the presence of amide bonds in their chemical backbone.
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Q. 1
General Knowledge
Difficulty: Easy
(1 Mark)
Cyanide acts as a poison by directly affecting the:
A
Brain
B
Affinity of blood for oxygen
C
Cardiac and respiratory system
D
Nervous system
✓ Correct
💡
Step-by-Step Explanation & Concept Rationale
Cyanide binds to cytochrome c oxidase, inhibiting cellular respiration and rapidly damaging the central nervous system.
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