Quiz for Work, Power and Energy

Q1: Work done is zero when:

A. Displacement is zero B. Force is zero C. Force is perpendicular to displacement D. All of the above

Q2: The SI unit of work is:

A. Joule B. Watt C. Newton D. Calorie

Q3: A force is said to do positive work when:

A. Angle between force and displacement is acute B. Force is zero C. Body is at rest D. Angle is 90°

Q4: Kinetic energy depends on:

A. Mass only B. Velocity only C. Mass and velocity D. Acceleration

Q5: The work-energy theorem states:

A. Work done = Change in KE B. Work done = Change in PE C. Work done = Force × time D. None

Q6: Which quantity is scalar?

A. Force B. Momentum C. Work D. Displacement

Q7: The unit of power is:

A. Joule B. Watt C. Newton D. Calorie

Q8: If power is constant and time doubles, then work done will:

A. Remain same B. Be halved C. Be doubled D. Be zero

Q9: The energy stored in a stretched spring is:

A. Kinetic energy B. Potential energy C. Thermal energy D. Electric energy

Q10: 1 horsepower (HP) =

A. 746 W B. 1 kW C. 1000 W D. 500 W

Q11: Which has more energy: 1 kg moving at 10 m/s or 2 kg at 7 m/s?

A. 1 kg body B. 2 kg body C. Both same D. Cannot say

Q12: Potential energy of an object depends on:

A. Height B. Velocity C. Mass and height D. Speed

Q13: If net work done on a body is zero, its kinetic energy:

A. Increases B. Decreases C. Becomes zero D. Remains constant

Q14: Power is defined as:

A. Work × time B. Force / distance C. Work / time D. Energy × time

Q15: A body is moving in a circle with constant speed. Work done is:

A. Zero B. Positive C. Negative D. Maximum

Q16: A man climbs a 10 m high hill. His potential energy increases by:

A. Depends on his weight B. Only on time C. Only on height D. Zero

Q17: A 60 W bulb consumes how much energy in 2 minutes?

A. 120 J B. 720 J C. 7200 J D. 3600 J

Q18: What is the kinetic energy of 2 kg mass moving at 3 m/s?

A. 9 J B. 6 J C. 3 J D. 18 J

Q19: Which of the following is not a form of mechanical energy?

A. Kinetic energy B. Potential energy C. Thermal energy D. Elastic energy

Q20: The spring constant k has units of:

A. N/m B. J C. kg·m²/s² D. N·m