PHYSICS (MECHANICS & ELECTRICITY) TESTS QUESTIONS
WITH 100% VERIFIED ANSWERS PLUS RATIONALES.
1. A particle moves with constant acceleration. Which of the following quantities
remains constant?
A. Velocity
B. Displacement
C. Acceleration
D. Kinetic energy
Correct Answer: C
Rationale: Constant acceleration means the rate of change of velocity is fixed.
Velocity and displacement change with time, and kinetic energy depends on velocity,
so they are not constant.
2. A car accelerates uniformly from rest to 20 m/s in 5 s. What is its acceleration?
A. 2 m/s²
B. 4 m/s²
C. 5 m/s²
D. 10 m/s²
Correct Answer: B
Rationale: Acceleration = (v − u)/t = (20 − 0)/5 = 4 m/s². Other options result from
incorrect calculations.
3. Which law explains why passengers lurch forward when a car suddenly stops?
A. Newton’s First Law
B. Newton’s Second Law
C. Newton’s Third Law
D. Law of Gravitation
Correct Answer: A
Rationale: Newton’s First Law (inertia) states that objects resist changes in motion.
Passengers continue moving forward when the car stops.
4. The unit of force in the SI system is:
A. Joule
B. Watt
C. Newton
D. Pascal
Correct Answer: C
Rationale: Force is measured in Newtons (N). Joule is energy, Watt is power, Pascal
is pressure.
,5. A body of mass 2 kg experiences a force of 10 N. What is its acceleration?
A. 2 m/s²
B. 5 m/s²
C. 10 m/s²
D. 20 m/s²
Correct Answer: B
Rationale: Using F = ma, a = F/m = 10/2 = 5 m/s².
6. Work done is maximum when the angle between force and displacement is:
A. 0°
B. 45°
C. 90°
D. 180°
Correct Answer: A
Rationale: Work = Fd cosθ, which is maximum when cosθ = 1 (θ = 0°).
7. The kinetic energy of a body depends on:
A. Mass only
B. Velocity only
C. Both mass and velocity
D. Neither mass nor velocity
Correct Answer: C
Rationale: KE = ½mv², so it depends on both mass and velocity.
8. A projectile is launched at 45°. Its range is maximum because:
A. Velocity is maximum
B. Time of flight is minimum
C. sin(2θ) is maximum
D. Acceleration is zero
Correct Answer: C
Rationale: Range ∝ sin(2θ), which is maximum at θ = 45°.
9. The momentum of an object is given by:
A. mv²
B. ma
C. mv
D. mgh
Correct Answer: C
Rationale: Momentum = mass × velocity.
,10. Which quantity is conserved in an elastic collision?
A. Kinetic energy only
B. Momentum only
C. Both momentum and kinetic energy
D. Neither
Correct Answer: C
Rationale: Elastic collisions conserve both momentum and kinetic energy.
11. The gravitational acceleration on Earth is approximately:
A. 5 m/s²
B. 9.8 m/s²
C. 15 m/s²
D. 20 m/s²
Correct Answer: B
Rationale: Standard gravitational acceleration is 9.8 m/s².
12. The centripetal force acting on a body moving in a circle is directed:
A. Outward
B. Tangentially
C. Toward the center
D. Along velocity
Correct Answer: C
Rationale: Centripetal force always points toward the center of the circular path.
13. Power is defined as:
A. Force × velocity
B. Work × time
C. Work/time
D. Energy × time
Correct Answer: C
Rationale: Power is the rate of doing work: P = W/t.
14. Ohm’s law states that V is proportional to I when:
A. Temperature changes
B. Resistance changes
C. Physical conditions remain constant
D. Current is zero
Correct Answer: C
Rationale: Ohm’s law holds only when temperature and physical conditions are
constant.
, 15. The SI unit of electric current is:
A. Volt
B. Ampere
C. Coulomb
D. Ohm
Correct Answer: B
Rationale: Current is measured in amperes (A).
16. Resistance is given by:
A. V × I
B. V/I
C. I/V
D. V²
Correct Answer: B
Rationale: From Ohm’s law, R = V/I.
17. Two resistors in series have equivalent resistance:
A. Product of resistances
B. Sum of resistances
C. Reciprocal sum
D. Difference
Correct Answer: B
Rationale: In series, resistances add directly.
18. Two resistors in parallel have equivalent resistance:
A. Sum
B. Difference
C. Reciprocal sum
D. Product
Correct Answer: C
Rationale: For parallel resistors, 1/R = 1/R₁ + 1/R₂.
19. Electrical power is given by:
A. VI
B. V/I
C. I/V
D. V²/I²
Correct Answer: A
Rationale: Power = Voltage × Current.
WITH 100% VERIFIED ANSWERS PLUS RATIONALES.
1. A particle moves with constant acceleration. Which of the following quantities
remains constant?
A. Velocity
B. Displacement
C. Acceleration
D. Kinetic energy
Correct Answer: C
Rationale: Constant acceleration means the rate of change of velocity is fixed.
Velocity and displacement change with time, and kinetic energy depends on velocity,
so they are not constant.
2. A car accelerates uniformly from rest to 20 m/s in 5 s. What is its acceleration?
A. 2 m/s²
B. 4 m/s²
C. 5 m/s²
D. 10 m/s²
Correct Answer: B
Rationale: Acceleration = (v − u)/t = (20 − 0)/5 = 4 m/s². Other options result from
incorrect calculations.
3. Which law explains why passengers lurch forward when a car suddenly stops?
A. Newton’s First Law
B. Newton’s Second Law
C. Newton’s Third Law
D. Law of Gravitation
Correct Answer: A
Rationale: Newton’s First Law (inertia) states that objects resist changes in motion.
Passengers continue moving forward when the car stops.
4. The unit of force in the SI system is:
A. Joule
B. Watt
C. Newton
D. Pascal
Correct Answer: C
Rationale: Force is measured in Newtons (N). Joule is energy, Watt is power, Pascal
is pressure.
,5. A body of mass 2 kg experiences a force of 10 N. What is its acceleration?
A. 2 m/s²
B. 5 m/s²
C. 10 m/s²
D. 20 m/s²
Correct Answer: B
Rationale: Using F = ma, a = F/m = 10/2 = 5 m/s².
6. Work done is maximum when the angle between force and displacement is:
A. 0°
B. 45°
C. 90°
D. 180°
Correct Answer: A
Rationale: Work = Fd cosθ, which is maximum when cosθ = 1 (θ = 0°).
7. The kinetic energy of a body depends on:
A. Mass only
B. Velocity only
C. Both mass and velocity
D. Neither mass nor velocity
Correct Answer: C
Rationale: KE = ½mv², so it depends on both mass and velocity.
8. A projectile is launched at 45°. Its range is maximum because:
A. Velocity is maximum
B. Time of flight is minimum
C. sin(2θ) is maximum
D. Acceleration is zero
Correct Answer: C
Rationale: Range ∝ sin(2θ), which is maximum at θ = 45°.
9. The momentum of an object is given by:
A. mv²
B. ma
C. mv
D. mgh
Correct Answer: C
Rationale: Momentum = mass × velocity.
,10. Which quantity is conserved in an elastic collision?
A. Kinetic energy only
B. Momentum only
C. Both momentum and kinetic energy
D. Neither
Correct Answer: C
Rationale: Elastic collisions conserve both momentum and kinetic energy.
11. The gravitational acceleration on Earth is approximately:
A. 5 m/s²
B. 9.8 m/s²
C. 15 m/s²
D. 20 m/s²
Correct Answer: B
Rationale: Standard gravitational acceleration is 9.8 m/s².
12. The centripetal force acting on a body moving in a circle is directed:
A. Outward
B. Tangentially
C. Toward the center
D. Along velocity
Correct Answer: C
Rationale: Centripetal force always points toward the center of the circular path.
13. Power is defined as:
A. Force × velocity
B. Work × time
C. Work/time
D. Energy × time
Correct Answer: C
Rationale: Power is the rate of doing work: P = W/t.
14. Ohm’s law states that V is proportional to I when:
A. Temperature changes
B. Resistance changes
C. Physical conditions remain constant
D. Current is zero
Correct Answer: C
Rationale: Ohm’s law holds only when temperature and physical conditions are
constant.
, 15. The SI unit of electric current is:
A. Volt
B. Ampere
C. Coulomb
D. Ohm
Correct Answer: B
Rationale: Current is measured in amperes (A).
16. Resistance is given by:
A. V × I
B. V/I
C. I/V
D. V²
Correct Answer: B
Rationale: From Ohm’s law, R = V/I.
17. Two resistors in series have equivalent resistance:
A. Product of resistances
B. Sum of resistances
C. Reciprocal sum
D. Difference
Correct Answer: B
Rationale: In series, resistances add directly.
18. Two resistors in parallel have equivalent resistance:
A. Sum
B. Difference
C. Reciprocal sum
D. Product
Correct Answer: C
Rationale: For parallel resistors, 1/R = 1/R₁ + 1/R₂.
19. Electrical power is given by:
A. VI
B. V/I
C. I/V
D. V²/I²
Correct Answer: A
Rationale: Power = Voltage × Current.
