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Lecturer / Teacher - Physics (Secondary & Higher Secondary Wings) Complete Preparation Guide & Solved Questions (2026) - Apex Rankers

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Physics

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Q. 1 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the rate of change of momentum of a body directly proportional to, according to Newton's Second Law of Motion?
A
The applied net external force
✓ Correct
B
The kinetic energy
C
The velocity of the body
D
The gravitational potential
💡 Step-by-Step Explanation & Concept Rationale
Newton's Second Law states that F = dp/dt (the rate of change of momentum is equal to the net applied force).
Q. 2 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
A ball is projected horizontally from a height h with initial velocity v. At the same instant, an identical ball is dropped vertically from the same height. Neglecting air resistance, which ball hits the ground first?
A
Both balls hit the ground at exactly the same time
✓ Correct
B
The dropped ball hits first
C
The horizontally projected ball hits first
D
It depends on the mass of the balls
💡 Step-by-Step Explanation & Concept Rationale
Vertical and horizontal motions are completely independent; both balls experience the identical vertical acceleration g and initial vertical velocity zero, taking time t = sqrt(2h/g).
Q. 3 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the centripetal acceleration of an object of mass m moving at constant speed v in a circular path of radius r?
A
a = v² / r directed towards the center
✓ Correct
B
a = v / r² directed tangentially
C
a = v² * r directed outward
D
a = zero because speed is constant
💡 Step-by-Step Explanation & Concept Rationale
Centripetal acceleration is a = v²/r directed radially inward toward the center of rotation.
Q. 4 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
In an isolated system, what quantities are conserved during a perfectly elastic collision between two particles?
A
Both total linear momentum and total kinetic energy
✓ Correct
B
Only total linear momentum, kinetic energy is lost
C
Only kinetic energy, momentum changes
D
Neither momentum nor kinetic energy
💡 Step-by-Step Explanation & Concept Rationale
In elastic collisions, both total momentum and total kinetic energy are strictly conserved.
Q. 5 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
What is the moment of inertia of a uniform solid cylinder of mass M and radius R rotating about its central longitudinal axis?
A
I = (1/2) M R²
✓ Correct
B
I = M R²
C
I = (2/5) M R²
D
I = (1/12) M R²
💡 Step-by-Step Explanation & Concept Rationale
For a solid cylinder or disk of mass M and radius R about its cylindrical axis, I = 1/2 MR².
Q. 6 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
How much work is done by a centripetal force on a satellite orbiting Earth in a circular orbit?
A
Zero work, because the force is always perpendicular to the displacement vector
✓ Correct
B
Positive work equal to G*M*m/r
C
Negative work equal to kinetic energy
D
Infinite work over infinite revolutions
💡 Step-by-Step Explanation & Concept Rationale
Work W = F * d * cos(theta). For circular motion, theta = 90 deg, so cos(90) = 0, meaning no work is done.
Q. 7 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
What fundamental law of physics is represented by Bernoulli's Principle in fluid dynamics?
A
The Law of Conservation of Energy
✓ Correct
B
The Law of Conservation of Momentum
C
The Law of Conservation of Mass
D
The Second Law of Thermodynamics
💡 Step-by-Step Explanation & Concept Rationale
Bernoulli's equation (P + 1/2 rho*v² + rho*g*h = constant) is a direct formulation of conservation of mechanical energy for steady, incompressible, non-viscous fluid flow.
Q. 8 Physics (Secondary & College Level)
Difficulty: HARD (1 Mark)
What happens to the terminal velocity of a small spherical raindrop falling through air if its radius is doubled (Stokes' Law)?
A
It increases by a factor of 4 (quadruples)
✓ Correct
B
It doubles
C
It remains unchanged
D
It increases by a factor of 8
💡 Step-by-Step Explanation & Concept Rationale
Terminal velocity v_t is proportional to r² (from equating weight proportional to r³ with viscous drag 6*pi*eta*r*v). Doubling radius increases v_t by 2² = 4.
Q. 9 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the theoretical maximum efficiency of a Carnot heat engine operating between a hot reservoir at T_H and a cold reservoir at T_C (in Kelvin)?
A
eta = 1 - (T_C / T_H)
✓ Correct
B
eta = 1 - (T_H / T_C)
C
eta = T_H / T_C
D
eta = (T_H - T_C) / T_C
💡 Step-by-Step Explanation & Concept Rationale
The Carnot efficiency is the absolute thermodynamic upper limit for any heat engine: eta = (T_H - T_C) / T_H = 1 - T_C/T_H.
Q. 10 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
In an adiabatic process involving an ideal gas, which thermodynamic variable remains zero?
A
Heat transfer (dQ = 0)
✓ Correct
B
Work done (dW = 0)
C
Change in internal energy (dU = 0)
D
Change in temperature (dT = 0)
💡 Step-by-Step Explanation & Concept Rationale
An adiabatic process is thermally insulated from the surroundings such that no heat enters or leaves the system (Q = 0).
Q. 11 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
According to the Second Law of Thermodynamics, what happens to the total entropy of an isolated system during an irreversible spontaneous process?
A
It always increases (dS > 0)
✓ Correct
B
It decreases to zero
C
It remains strictly constant
D
It fluctuates unpredictably
💡 Step-by-Step Explanation & Concept Rationale
The Second Law dictates that the entropy of an isolated system never decreases and strictly increases in all natural spontaneous irreversible processes.
Q. 12 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the time period T of a simple pendulum of length L in a gravitational field g for small angular displacements?
A
T = 2 * pi * sqrt(L / g)
✓ Correct
B
T = 2 * pi * sqrt(g / L)
C
T = pi * sqrt(L * g)
D
T = 2 * pi * (L / g)
💡 Step-by-Step Explanation & Concept Rationale
The period of a simple pendulum is T = 2*pi*sqrt(L/g), independent of the mass of the bob.
Q. 13 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
When light travels from an optically denser medium (refractive index n1) into a rarer medium (n2) at an angle of incidence greater than the critical angle, what phenomenon occurs?
A
Total Internal Reflection
✓ Correct
B
Polarization by Scattering
C
Diffraction
D
Refraction towards the normal
💡 Step-by-Step Explanation & Concept Rationale
Total internal reflection occurs when light strikes a boundary with a rarer medium at an angle exceeding critical angle theta_c = arcsin(n2/n1).
Q. 14 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
In Young's Double-Slit Experiment, what is the fringe width (fringe spacing beta) on a screen at distance D for light of wavelength lambda with slit separation d?
A
beta = (lambda * D) / d
✓ Correct
B
beta = (lambda * d) / D
C
beta = (d * D) / lambda
D
beta = lambda / (d * D)
💡 Step-by-Step Explanation & Concept Rationale
Fringe spacing beta = lambda * D / d.
Q. 15 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is Coulomb's law for the electrostatic force between two point charges q1 and q2 separated by distance r in vacuum?
A
F = (1 / (4 * pi * epsilon_0)) * (q1 * q2 / r²)
✓ Correct
B
F = (1 / (4 * pi * epsilon_0)) * (q1 * q2 / r)
C
F = epsilon_0 * (q1 * q2 / r²)
D
F = (q1 + q2) / r²
💡 Step-by-Step Explanation & Concept Rationale
Coulomb's Law states force is directly proportional to the product of charges and inversely proportional to the square of distance.
Q. 16 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the equivalent capacitance when two capacitors C1 and C2 are connected in parallel?
A
C_eq = C1 + C2
✓ Correct
B
C_eq = (C1 * C2) / (C1 + C2)
C
C_eq = 1/C1 + 1/C2
D
C_eq = sqrt(C1 * C2)
💡 Step-by-Step Explanation & Concept Rationale
In parallel, capacitors add directly: C_eq = C1 + C2.
Q. 17 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
According to Faraday's Law of Electromagnetic Induction and Lenz's Law, what is the induced electromotive force (EMF)?
A
EMF = - N * (dPhi / dt)
✓ Correct
B
EMF = + N * (dPhi / dt)
C
EMF = N * I * R
D
EMF = B * A * t
💡 Step-by-Step Explanation & Concept Rationale
Faraday-Lenz Law states induced EMF is proportional to the negative rate of change of magnetic flux through the circuit.
Q. 18 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the energy E of a photon of light with frequency f according to Planck's Quantum Theory?
A
E = h * f
✓ Correct
B
E = h / f
C
E = f / h
D
E = 1/2 h * f²
💡 Step-by-Step Explanation & Concept Rationale
Planck's equation states that photon energy is quantized as E = hf, where h is Planck's constant (6.626 x 10^-34 J s).
Q. 19 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
In the Photoelectric Effect, what happens to the maximum kinetic energy of emitted photoelectrons when the frequency of incident light is increased above the threshold frequency?
A
It increases linearly with incident frequency
✓ Correct
B
It remains constant while electron count increases
C
It decreases exponentially
D
It drops to zero
💡 Step-by-Step Explanation & Concept Rationale
Einstein's photoelectric equation (KE_max = hf - Phi) shows that kinetic energy increases linearly with photon frequency.
Q. 20 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the half-life t_1/2 of a radioactive isotope with decay constant lambda?
A
t_1/2 = ln(2) / lambda ≈ 0.693 / lambda
✓ Correct
B
t_1/2 = lambda / 0.693
C
t_1/2 = 1 / lambda²
D
t_1/2 = lambda * ln(2)
💡 Step-by-Step Explanation & Concept Rationale
Half-life is related to the decay constant by t_1/2 = ln(2)/lambda = 0.693/lambda.
Q. 21 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
What is the de Broglie wavelength lambda associated with a particle of mass m moving with velocity v?
A
lambda = h / (m * v) = h / p
✓ Correct
B
lambda = (m * v) / h
C
lambda = h * m * v
D
lambda = p² / (2 * m)
💡 Step-by-Step Explanation & Concept Rationale
The de Broglie wave equation relates matter wavelength to momentum via lambda = h/p.
Q. 22 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the SI unit of Magnetic Flux?
A
Weber (Wb)
✓ Correct
B
Tesla (T)
C
Henry (H)
D
Gauss (G)
💡 Step-by-Step Explanation & Concept Rationale
Magnetic flux is measured in Webers (Wb = T m²). Magnetic flux density is measured in Tesla (T).
Q. 23 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the SI unit of Self-Inductance and Mutual Inductance?
A
Henry (H)
✓ Correct
B
Farad (F)
C
Weber (Wb)
D
Siemens (S)
💡 Step-by-Step Explanation & Concept Rationale
Inductance is measured in Henries (1 H = 1 Wb/A = 1 V s/A).
Q. 24 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What type of semiconductor is formed when pure silicon (Group IV) is doped with a trivalent impurity like Boron or Gallium?
A
p-type semiconductor (holes are majority carriers)
✓ Correct
B
n-type semiconductor (electrons are majority carriers)
C
Intrinsic semiconductor
D
Superconductor
💡 Step-by-Step Explanation & Concept Rationale
Trivalent dopants have 3 valence electrons, creating electron vacancies (holes), producing p-type semiconductors.
Q. 25 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What type of semiconductor is produced by doping Germanium or Silicon with a pentavalent impurity like Phosphorus or Arsenic?
A
n-type semiconductor (free electrons are majority carriers)
✓ Correct
B
p-type semiconductor
C
Insulator
D
Photodiode
💡 Step-by-Step Explanation & Concept Rationale
Pentavalent dopants donate an extra free conduction electron, producing n-type semiconductors.
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