(a) Work, Energy and Power - Jamb Physics Past Questions and Answers

Question 6:

• JAMB 1983

A man of mass 50kg ascends a flight of stairs 5m high in 5 seconds. If acceleration due to gravity is 10ms^-2, the power expended is

A. 100W
B. 200W
C. 250W
D. 400W
E. 500W

Question 7:

• JAMB 1983

Of the following derived units, the one that is not a unit of power is

A. Joule/second
B. Ampere volt
C. Ampere²volt
D. Volts²/ohm

Question 8:

• JAMB 1983

Which of the following best describes the energy changes which take place when a steam engine drives a generator which lights a lamp?

A. Heat \( \to \) light \( \to \) sound \( \to \) kinetic
B. Kinetic \( \to \) light \( \to \) heat \( \to \) electricity
C. Heat \( \to \) kinetic\( \to \) electricity \( \to \) heat \( \to \) light
D. Electricity \( \to \) kinetic \( \to \) heat v light
E. Heat \(\ to \) sound \( \to \) kninetic v electricity

Question 9:

• JAMB 1984

If a water pump at Kainji Dam is capable of lifting 1000kg of water through a vertical height of 10m in 10s, the power of the pump is [g = 10ms^-2]

A. 1.0kW
B. 10.0kW
C. 12.5kW
D. 15.0kW
E. 20.0kW

Question 10:

• JAMB 1984

A device that converts sound energy into electrical energy is

A. The horn of a motor car
B. An A.C. generator
C. A microphone
D. The telephone
E. Radio waves