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Physics (Secondary & College Level) (Physics) Solved Questions & Notes (2026) - Apex Rankers

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280 Total Solved Questions
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Physics (Secondary & College Level)

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Q. 1 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. 2 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. 3 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. 4 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. 5 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.
Q. 6 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
In a step-up electrical transformer, which condition is true regarding primary and secondary coils?
A
Secondary turns N_s > Primary turns N_p and Secondary Voltage V_s > Primary Voltage V_p
✓ Correct
B
Secondary turns N_s < Primary turns N_p
C
Secondary Current I_s > Primary Current I_p
D
Total output power exceeds input power
💡 Step-by-Step Explanation & Concept Rationale
A step-up transformer increases voltage proportionally to turns ratio (V_s/V_p = N_s/N_p) while current decreases to conserve energy.
Q. 7 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the speed of electromagnetic waves in a vacuum (c)?
A
3.0 x 10^8 m/s
✓ Correct
B
3.0 x 10^6 m/s
C
3.0 x 10^5 km/s
D
3.0 x 10^10 m/s
💡 Step-by-Step Explanation & Concept Rationale
Speed of light in vacuum c = 1 / sqrt(mu_0 * epsilon_0) ≈ 2.998 x 10^8 m/s.
Q. 8 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
What is the escape velocity from the surface of the Earth (radius R and mass M)?
A
v_esc = sqrt(2 * G * M / R) ≈ 11.2 km/s
✓ Correct
B
v_esc = sqrt(G * M / R)
C
v_esc = 2 * G * M / R²
D
v_esc = sqrt(g * R / 2)
💡 Step-by-Step Explanation & Concept Rationale
Escape velocity is derived from kinetic energy equaling gravitational binding energy: v_esc = sqrt(2GM/R) ≈ 11.2 km/s for Earth.
Q. 9 Physics (Secondary & College Level)
Difficulty: HARD (1 Mark)
Which physical quantity remains conserved in Kepler's Second Law of Planetary Motion (Equal Areas Law)?
A
Orbital Angular Momentum
✓ Correct
B
Linear Momentum
C
Total Kinetic Energy
D
Gravitational Force
💡 Step-by-Step Explanation & Concept Rationale
Because gravitational torque is zero about the Sun, areal velocity dA/dt = L / (2m) is constant, proving conservation of angular momentum.
Q. 10 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
What is the impedance Z of a series RLC alternating current circuit at resonance frequency?
A
Z = R (minimum impedance, purely resistive)
✓ Correct
B
Z = infinity
C
Z = omega * L
D
Z = 1 / (omega * C)
💡 Step-by-Step Explanation & Concept Rationale
At resonance, inductive reactance X_L equals capacitive reactance X_C, canceling out the reactive component so Z = R.
Q. 11 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
What is Brewster's angle theta_B for unpolarized light reflected from a dielectric interface of refractive index n?
A
tan(theta_B) = n
✓ Correct
B
sin(theta_B) = n
C
cos(theta_B) = n
D
theta_B = 45 degrees
💡 Step-by-Step Explanation & Concept Rationale
Brewster's Law states that reflected light is 100% linearly polarized when tan(theta_B) = n2/n1.
Q. 12 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the resistance of an ideal voltmeter and an ideal ammeter respectively?
A
Voltmeter: Infinite resistance; Ammeter: Zero resistance
✓ Correct
B
Voltmeter: Zero resistance; Ammeter: Infinite resistance
C
Both have 50 Ohm resistance
D
Both have zero resistance
💡 Step-by-Step Explanation & Concept Rationale
An ideal voltmeter draws zero current (R = inf), while an ideal ammeter introduces zero voltage drop (R = 0).
Q. 13 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What law states that the total electric flux out of a closed Gaussian surface is equal to the enclosed charge divided by permittivity?
A
Gauss's Law for Electrostatics
✓ Correct
B
Ampere's Law
C
Biot-Savart Law
D
Faraday's Law
💡 Step-by-Step Explanation & Concept Rationale
Gauss's Law: Phi_E = oint E * dA = Q_enclosed / epsilon_0.
Q. 14 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the work done in moving a test charge q along an equipotential surface between two points?
A
Zero Joules
✓ Correct
B
q * V
C
1/2 q * V²
D
Infinite Joules
💡 Step-by-Step Explanation & Concept Rationale
Since potential difference delta V = 0 along an equipotential surface, W = q * delta V = 0.
Q. 15 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
What is the resolving power of a microscope primarily limited by according to Rayleigh's criterion?
A
Diffraction of light (wavelength lambda and numerical aperture NA)
✓ Correct
B
The focal length of the eyepiece exclusively
C
The brightness of the light source
D
The thickness of the glass slide
💡 Step-by-Step Explanation & Concept Rationale
Resolving limit d = 0.61 * lambda / NA is fundamentally governed by wave diffraction.
Q. 16 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. 17 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. 18 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. 19 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. 20 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.
Q. 21 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
In a step-up electrical transformer, which condition is true regarding primary and secondary coils?
A
Secondary turns N_s > Primary turns N_p and Secondary Voltage V_s > Primary Voltage V_p
✓ Correct
B
Secondary turns N_s < Primary turns N_p
C
Secondary Current I_s > Primary Current I_p
D
Total output power exceeds input power
💡 Step-by-Step Explanation & Concept Rationale
A step-up transformer increases voltage proportionally to turns ratio (V_s/V_p = N_s/N_p) while current decreases to conserve energy.
Q. 22 Physics (Secondary & College Level)
Difficulty: EASY (1 Mark)
What is the speed of electromagnetic waves in a vacuum (c)?
A
3.0 x 10^8 m/s
✓ Correct
B
3.0 x 10^6 m/s
C
3.0 x 10^5 km/s
D
3.0 x 10^10 m/s
💡 Step-by-Step Explanation & Concept Rationale
Speed of light in vacuum c = 1 / sqrt(mu_0 * epsilon_0) ≈ 2.998 x 10^8 m/s.
Q. 23 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
What is the escape velocity from the surface of the Earth (radius R and mass M)?
A
v_esc = sqrt(2 * G * M / R) ≈ 11.2 km/s
✓ Correct
B
v_esc = sqrt(G * M / R)
C
v_esc = 2 * G * M / R²
D
v_esc = sqrt(g * R / 2)
💡 Step-by-Step Explanation & Concept Rationale
Escape velocity is derived from kinetic energy equaling gravitational binding energy: v_esc = sqrt(2GM/R) ≈ 11.2 km/s for Earth.
Q. 24 Physics (Secondary & College Level)
Difficulty: HARD (1 Mark)
Which physical quantity remains conserved in Kepler's Second Law of Planetary Motion (Equal Areas Law)?
A
Orbital Angular Momentum
✓ Correct
B
Linear Momentum
C
Total Kinetic Energy
D
Gravitational Force
💡 Step-by-Step Explanation & Concept Rationale
Because gravitational torque is zero about the Sun, areal velocity dA/dt = L / (2m) is constant, proving conservation of angular momentum.
Q. 25 Physics (Secondary & College Level)
Difficulty: MEDIUM (1 Mark)
What is the impedance Z of a series RLC alternating current circuit at resonance frequency?
A
Z = R (minimum impedance, purely resistive)
✓ Correct
B
Z = infinity
C
Z = omega * L
D
Z = 1 / (omega * C)
💡 Step-by-Step Explanation & Concept Rationale
At resonance, inductive reactance X_L equals capacitive reactance X_C, canceling out the reactive component so Z = R.
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