PHYSICS QUESTIONS AND ANSWERS
1. Kinematics: Displacement and Velocity
1. An object moves along a straight line with a constant velocity of 5 m/s. How far will it travel in
12 seconds?
A. 5 m
B. 12 m
C. 60 m
D. 17 m
Correct Answer: C
Rationale: Distance = velocity × time = 5 m/s × 12 s = 60 m.
2. If an object’s position is given by s(t)=4t2s(t)=4t^2 (in meters) with tt in seconds, what is its
instantaneous velocity at t=3t=3 s?
A. 12 m/s
B. 24 m/s
C. 36 m/s
D. 18 m/s
Correct Answer: B
Rationale: Velocity is the derivative v(t)=dsdt=8tv(t)=\frac{ds}{dt}=8t. At t=3t=3, v(3)=8(3)=24
m/sv(3)=8(3)=24\,\text{m/s}.
3. An object accelerates uniformly from rest with an acceleration of 2 m/s². What is its
displacement after 5 seconds?
A. 25 m
B. 20 m
C. 15 m
D. 10 m
Correct Answer: A
Rationale: Use s=12at2s=\frac{1}{2}at^2. Here, s=12(2)(52)=1⋅25=25 ms=\frac{1}{2}(2)(5^2)=1\
cdot25=25\,\text{m}.
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, 4. Which of the following graphs best represents an object with constant acceleration?
A. A straight line on a velocity-time graph
B. A horizontal line on a velocity-time graph
C. A curved line on a displacement-time graph
D. Both A and C
Correct Answer: D
Rationale: Constant acceleration produces a straight line in a velocity-time graph and a parabolic
(curved) shape in a displacement-time graph.
5. If an object is moving with constant speed, what can be said about its acceleration?
A. It is zero.
B. It is constant and nonzero.
C. It is changing continuously.
D. It depends on the direction.
Correct Answer: A
Rationale: Constant speed (with no change in magnitude of velocity) implies zero acceleration in
the absence of directional change.
2. Newton’s Laws of Motion
6. Newton’s First Law is also known as the law of:
A. Acceleration
B. Inertia
C. Action and reaction
D. Gravitation
Correct Answer: B
Rationale: Newton’s First Law states that an object at rest remains at rest and an object in
motion remains in motion unless acted upon by a net external force; this property is called
inertia.
7. According to Newton’s Second Law, if the net force on an object is doubled while its mass
remains the same, its acceleration will:
A. Remain the same
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, B. Double
C. Halve
D. Quadruple
Correct Answer: B
Rationale: Newton’s Second Law is F=maF=ma. If FF doubles and mm is constant, then aa
doubles.
8. Newton’s Third Law states that:
A. For every action, there is an equal and opposite reaction.
B. Force is directly proportional to acceleration.
C. Objects in motion remain in motion.
D. Energy cannot be created or destroyed.
Correct Answer: A
Rationale: Newton’s Third Law states that forces always occur in action–reaction pairs of equal
magnitude and opposite direction.
9. A free body diagram is used to:
A. Calculate the net force acting on an object.
B. Show all external forces acting on an object.
C. Simplify the analysis of motion.
D. All of the above.
Correct Answer: D
Rationale: Free body diagrams help visualize and sum the forces acting on an object to analyze
its motion.
10. Friction is an example of:
A. A contact force
B. A gravitational force
C. A non-contact force
D. A nuclear force
Correct Answer: A
Rationale: Friction is a force that arises from the contact between surfaces.
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1. Kinematics: Displacement and Velocity
1. An object moves along a straight line with a constant velocity of 5 m/s. How far will it travel in
12 seconds?
A. 5 m
B. 12 m
C. 60 m
D. 17 m
Correct Answer: C
Rationale: Distance = velocity × time = 5 m/s × 12 s = 60 m.
2. If an object’s position is given by s(t)=4t2s(t)=4t^2 (in meters) with tt in seconds, what is its
instantaneous velocity at t=3t=3 s?
A. 12 m/s
B. 24 m/s
C. 36 m/s
D. 18 m/s
Correct Answer: B
Rationale: Velocity is the derivative v(t)=dsdt=8tv(t)=\frac{ds}{dt}=8t. At t=3t=3, v(3)=8(3)=24
m/sv(3)=8(3)=24\,\text{m/s}.
3. An object accelerates uniformly from rest with an acceleration of 2 m/s². What is its
displacement after 5 seconds?
A. 25 m
B. 20 m
C. 15 m
D. 10 m
Correct Answer: A
Rationale: Use s=12at2s=\frac{1}{2}at^2. Here, s=12(2)(52)=1⋅25=25 ms=\frac{1}{2}(2)(5^2)=1\
cdot25=25\,\text{m}.
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, 4. Which of the following graphs best represents an object with constant acceleration?
A. A straight line on a velocity-time graph
B. A horizontal line on a velocity-time graph
C. A curved line on a displacement-time graph
D. Both A and C
Correct Answer: D
Rationale: Constant acceleration produces a straight line in a velocity-time graph and a parabolic
(curved) shape in a displacement-time graph.
5. If an object is moving with constant speed, what can be said about its acceleration?
A. It is zero.
B. It is constant and nonzero.
C. It is changing continuously.
D. It depends on the direction.
Correct Answer: A
Rationale: Constant speed (with no change in magnitude of velocity) implies zero acceleration in
the absence of directional change.
2. Newton’s Laws of Motion
6. Newton’s First Law is also known as the law of:
A. Acceleration
B. Inertia
C. Action and reaction
D. Gravitation
Correct Answer: B
Rationale: Newton’s First Law states that an object at rest remains at rest and an object in
motion remains in motion unless acted upon by a net external force; this property is called
inertia.
7. According to Newton’s Second Law, if the net force on an object is doubled while its mass
remains the same, its acceleration will:
A. Remain the same
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, B. Double
C. Halve
D. Quadruple
Correct Answer: B
Rationale: Newton’s Second Law is F=maF=ma. If FF doubles and mm is constant, then aa
doubles.
8. Newton’s Third Law states that:
A. For every action, there is an equal and opposite reaction.
B. Force is directly proportional to acceleration.
C. Objects in motion remain in motion.
D. Energy cannot be created or destroyed.
Correct Answer: A
Rationale: Newton’s Third Law states that forces always occur in action–reaction pairs of equal
magnitude and opposite direction.
9. A free body diagram is used to:
A. Calculate the net force acting on an object.
B. Show all external forces acting on an object.
C. Simplify the analysis of motion.
D. All of the above.
Correct Answer: D
Rationale: Free body diagrams help visualize and sum the forces acting on an object to analyze
its motion.
10. Friction is an example of:
A. A contact force
B. A gravitational force
C. A non-contact force
D. A nuclear force
Correct Answer: A
Rationale: Friction is a force that arises from the contact between surfaces.
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