Q.1 What is the SI unit of force?
Newton
Joule
Watt
Pascal
Explanation - The SI unit of force is Newton (N), defined as kg·m/s².
Correct answer is: Newton
Q.2 Which of the following is a vector quantity?
Speed
Mass
Velocity
Distance
Explanation - Velocity has both magnitude and direction, making it a vector.
Correct answer is: Velocity
Q.3 What is the acceleration due to gravity on Earth approximately?
8.9 m/s²
9.8 m/s²
10.8 m/s²
7.5 m/s²
Explanation - The average acceleration due to gravity near Earth's surface is 9.8 m/s².
Correct answer is: 9.8 m/s²
Q.4 A body moving in a circular path at constant speed experiences:
No acceleration
Tangential acceleration
Centripetal acceleration
Zero net force
Explanation - Even though speed is constant, the direction changes, producing centripetal acceleration.
Correct answer is: Centripetal acceleration
Q.5 Which law of motion states that a body will remain at rest or in uniform motion unless acted upon by a force?
Newton's First Law
Newton's Second Law
Newton's Third Law
Law of Gravitation
Explanation - Newton's First Law is also known as the law of inertia.
Correct answer is: Newton's First Law
Q.6 Work is defined as:
Force × Displacement
Force × Velocity
Mass × Acceleration
Energy × Time
Explanation - Work is the product of force and displacement in the direction of the force.
Correct answer is: Force × Displacement
Q.7 The slope of a velocity-time graph represents:
Speed
Acceleration
Distance
Force
Explanation - The slope of velocity vs. time graph is the rate of change of velocity, which is acceleration.
Correct answer is: Acceleration
Q.8 Kinetic energy of a body depends on:
Velocity only
Mass only
Mass and Velocity
Height above ground
Explanation - Kinetic energy = (1/2) m v², depends on both mass and velocity.
Correct answer is: Mass and Velocity
Q.9 Which type of collision conserves both momentum and kinetic energy?
Elastic collision
Inelastic collision
Perfectly inelastic collision
Plastic collision
Explanation - Elastic collisions conserve both momentum and kinetic energy.
Correct answer is: Elastic collision
Q.10 What is momentum defined as?
Mass × Acceleration
Mass × Velocity
Force × Time
Velocity × Distance
Explanation - Momentum is the product of mass and velocity.
Correct answer is: Mass × Velocity
Q.11 The unit of power in SI is:
Watt
Joule
Newton
Pascal
Explanation - Power is the rate of doing work, and its SI unit is Watt (Joule/second).
Correct answer is: Watt
Q.12 If no external force acts on a system, the total momentum remains constant. This is the law of:
Inertia
Conservation of Energy
Conservation of Momentum
Conservation of Mass
Explanation - Momentum is conserved in an isolated system with no external forces.
Correct answer is: Conservation of Momentum
Q.13 Which of the following is not a scalar quantity?
Time
Work
Force
Distance
Explanation - Force has magnitude and direction, so it is a vector, not a scalar.
Correct answer is: Force
Q.14 Displacement can be:
Only positive
Only negative
Zero, positive, or negative
Always greater than distance
Explanation - Displacement depends on direction, so it can be zero, positive, or negative.
Correct answer is: Zero, positive, or negative
Q.15 What is the centripetal force responsible for keeping planets in orbit around the Sun?
Magnetic Force
Electric Force
Gravitational Force
Frictional Force
Explanation - The gravitational attraction between the Sun and planets provides the centripetal force.
Correct answer is: Gravitational Force
Q.16 What is the potential energy of a mass m raised to a height h?
mgh
1/2 mv²
mg/h
mh/g
Explanation - Potential energy is given by mgh, where g is acceleration due to gravity.
Correct answer is: mgh
Q.17 Which type of motion does a freely falling object exhibit?
Uniform motion
Uniformly accelerated motion
Circular motion
Oscillatory motion
Explanation - A freely falling object accelerates uniformly under gravity.
Correct answer is: Uniformly accelerated motion
Q.18 The inertia of a body depends on:
Velocity
Mass
Acceleration
Force applied
Explanation - Inertia is the property of matter that depends on its mass.
Correct answer is: Mass
Q.19 The SI unit of work is:
Newton
Joule
Watt
Erg
Explanation - Work is measured in Joules, defined as Newton × meter.
Correct answer is: Joule
Q.20 Which law explains the action and reaction forces?
Newton's First Law
Newton's Second Law
Newton's Third Law
Law of Gravitation
Explanation - Newton's Third Law states: for every action, there is an equal and opposite reaction.
Correct answer is: Newton's Third Law
Q.21 Which of these quantities can never be negative?
Velocity
Displacement
Distance
Acceleration
Explanation - Distance is a scalar quantity and is always positive or zero.
Correct answer is: Distance
Q.22 Impulse is equal to:
Force × Distance
Force × Time
Mass × Acceleration
Mass × Time
Explanation - Impulse is the product of force and the time duration it acts.
Correct answer is: Force × Time
Q.23 What does the area under a velocity-time graph represent?
Acceleration
Displacement
Force
Power
Explanation - The area under velocity-time graph gives displacement.
Correct answer is: Displacement
Q.24 A machine has a mechanical advantage of 5. If the input force is 20 N, the output force is:
5 N
100 N
25 N
200 N
Explanation - Mechanical advantage = Output Force / Input Force. So Output = 5 × 20 = 100 N.
Correct answer is: 100 N
Q.25 The motion of a pendulum is an example of:
Translational motion
Rotational motion
Oscillatory motion
Circular motion
Explanation - A pendulum swings back and forth about its mean position, showing oscillatory motion.
Correct answer is: Oscillatory motion