Waec Physics 2002 Past Questions and Answers

Question 16:

• WAEC 2002

Which of the following statements correctly defines quantitatively the work done by a force? the product of the force and the distance moved

A. Parallel to the line of action of the force from a reference point
B. Perpendicular to the line of action of the force from a reference point
C. On a line through the reference point
D. By the object

Question 17:

• WAEC 2002

a load of mass120kg is raised vertically through a height of 2m in 30s by a machine whose efficiency is 100%. Calculate the power generated by the machine. [g = 10ms^-2]

A. 60W
B. 80W
C. 100W
D. 120W

Question 18:

• WAEC 2002

A block and tackle system has 6 pulleys. If the efficiency of the machine is 60%, determine its mechanical advantages

A. 12.0
B. 10.0
C. 3.6
D. 1.8

Question 19:

• WAEC 2002

Which of the following actions will improve the efficiency of the pulley system?

A. Reducing the mass of the pulley
B. Increasing the friction force between the string and the pulley
C. Increasing the mass per unit length of the string of the pulley
D. Increasing the mass of the pulley

Question 20:

• WAEC 2002

The ice and steam points of a certain thermometer are -20^o and 100^o respectively. Calculate the Celsius temperature temperature corresponding to 70^o on the thermometer

A. 84.0^o
B. 75.0^o
C. 64.0^o
D. 58.0^o