Quiz for Power

Q1: A body does 100 J of work in 5 seconds. What is its power?

A. 5 W B. 10 W C. 20 W D. 25 W

Q2: 1 horsepower is equal to how many watts?

A. 746 B. 736 C. 750 D. 780

Q3: A 60 W bulb glows for 10 hours. Energy consumed is:

A. 2.16 MJ B. 2160 J C. 6000 J D. 21.6 kJ

Q4: The commercial unit of energy is:

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

Q5: Which of these is a scalar quantity?

A. Power B. Displacement C. Velocity D. Momentum

Q6: A machine delivers 1000 J of energy in 2 s. Its power is:

A. 200 W B. 500 W C. 1000 W D. 2000 W

Q7: A man climbs 20 m in 10 seconds. His mass is 50 kg. What is his power output? (g=10 m/s²)

A. 500 W B. 1000 W C. 1500 W D. 2000 W

Q8: What does average power mean?

A. Total energy used B. Total work done C. Work done per unit time D. Time taken per work

Q9: Instantaneous power is:

A. Work done per unit time B. Power at any instant C. Total energy per second D. All of these

Q10: A device consumes 500 W. How much energy in kWh is used in 4 hours?

A. 1 kWh B. 2 kWh C. 4 kWh D. 0.5 kWh

Q11: The rate of doing work is called:

A. Force B. Power C. Energy D. Velocity

Q12: If velocity of a body doubles, its power becomes:

A. Same B. Doubled C. Four times D. Halved

Q13: Which bulb consumes more power?

A. 40 W B. 60 W C. 100 W D. 25 W

Q14: What is the dimensional formula of power?

A. ML²T⁻³ B. MLT⁻² C. ML²T⁻² D. ML⁻¹T⁻²

Q15: In uniform circular motion, the power is:

A. Zero B. Constant C. Increases D. Decreases

Q16: Power is a function of:

A. Work and time B. Displacement C. Velocity only D. Acceleration only

Q17: Which of the following has the highest power output?

A. Human B. Horse C. Machine D. Sun

Q18: If a 60 W and 100 W bulb operate at the same voltage, which has higher resistance?

A. 60 W B. 100 W C. Both same D. Cannot be determined

Q19: Power developed by a force is maximum when the angle between force and velocity is:

A. 0° B. 45° C. 90° D. 180°