Waec Physics 2008 Past Questions and Answers

Question 11:

• WAEC 2008

The diagram above illustrates a bar magnet near a coil connected to a galvanometer, When the magnet is rapidly moves towards the coil i. e.m.f. is induced in the coil ii. the galvanometer needle deflects iii. the magnet is attracted by the coil. Which of the statements above is/are correct?

A. I only
B. Ii only
C. Iii only
D. I and iii only

Question 12:

• WAEC 2008

The mass attached to a string is moving in a circular path. If the speed is doubled, the tension in the string will be

A. Doubled
B. Halved
C. Four times as great
D. One-fourth as much

Question 13:

• WAEC 2008

An object of mass 2kg moving with a velocity 3ms^-11 collides head-on with another object of mass 1kg moving in the opposite direction with a velocity of 4ms^-1. If the objects stick together after collision, calculate their common speed.

A. 0.60ms^-1
B. 0.67ms^-1
C. 2.00ms^-1
D. 3.33^-1

Question 14:

• WAEC 2008

A ball is dropped and it hits the floor at a point A. It rebounds upward to a point B. While moving from A to B its

A. Kinetic energy is increasing
B. Potential energy is increasing
C. Potential energy is decreasing
D. Kinetic energy remains constant

Question 15:

• WAEC 2008

Which of the following devices convert heat energy to electrical energy?

A. Transformer
B. Dynamo
C. Thermocouple
D. Thermostat