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 1984

What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 kobo per kWh?

A. N0.65
B. N0.13
C. N3.90
D. N39.00
E. N234.00

Question 9:

• JAMB 1984

A force varying linearly with the distance acts on a body as shown above, The work done on the body by the force during the first 10m of motion is

A. 100J
B. 150J
C. 200J
D. 300J
E. 600J

Question 10:

• JAMB 1985

In the Fig above, Current I passes through the combination, if the power dissipated in the 5 ohm resistor is 40W, then the power dissipated in the 10 ohm resistor is

A. 10W
B. 20W
C. 40W
D. 80
E. 100W