Waec Physics 2001 Past Questions and Answers

Question 11:

• WAEC 2001

The time rate of change of momentum is

A. Impulse
B. Force
C. Power
D. Pressure

Question 12:

• WAEC 2001

Which of the following statements about elastic collision is correct?

A. Momentum is lost due to the sound produced
B. Loss of momentim is equal to loss in kinetic energy
C. Both kinetic energy and momentum are conserved
D. Kinetic energy is lost while momentum is conserved

Question 13:

• WAEC 2001

Electrical resistance is a property of an electrical energy to be converted into

A. Mechanical energy
B. Heat energy
C. Magnetic energy
D. Chemical energy

Question 14:

• WAEC 2001

A simple machine with an efficiency of 75% lifts a load of 5000N when a force of 500N is applied to it. Calculate the velocity ratio of the machine

A. 10.0
B. 13.3
C. 17.5
D. 25.0

Question 15:

• WAEC 2001

A screw jack with a Tommy bar of length 12cm is used to raise a car through a vertical height of 25cm by turning the Tommy bar through 50 revolutions. Calculate the approximate velocity ratio of the jack [\(\pi = 3.142\)]

A. 21
B. 38
C. 48
D. 151