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

Question 1:

• JAMB 1978

If NEPA charges 5k per kWhr, what is the cost of operating for 24 hours a lamp required 1A on a 200v line?

A. 24k
B. 55k
C. 40k
D. 26k
E. 32k

Question 2:

• JAMB 1979

A 500kg car which was initially at rest travelled with an acceleration of 5m sec^-2, its kinetic energy after 4 seconds was

A. 10⁵J
B. 2.5 x 10³J
C. 2 x 10³J
D. 5 x 10³J
E. 5 x 10^5J`

Question 3:

• JAMB 1979

A landlord has eight 40W electric light bulbs, four 60W bulbs and two 100W bulb in his house. If he has all the points on for five hours daily and if N.E.P.A. charges 5k per unit, his bill for 30 days is

A. N5.70
B. N7.23
C. N3.65
D. N8.05
E. N4.50

Question 4:

• JAMB 1979

A body is released from rest and allowed to fall freely from a given height under gravity. The kinetic energy at its half-way point is

A. A little above half of its initial energy
B. A little below half of its initial energy
C. A half of its initioal energy
D. A little above its initial energy
E. A little below its initial energy

Question 5:

• JAMB 1980

A stand-by generator is connected to fifteen 40 W lamps and musician's 600 W amplifying system. How much energy is used if the generator runs for 6 hours?

A. 3.84k Wh
B. 7.20k Wh
C. 8.40k Wh
D. 12.00k Wh
E. 14.56k Wh