Waec Physics Past Questions and Answers

Question 36:

• WAEC 1988

0.5kg of water at 10^oC is completely converted to ice by extracting 188000J of heat from it. If the specific heat capacity of water is 4200J kg^-1C^-1, calculate the specific latent heat of fusion of ice.

A. 9.0 KJ kg^-1
B. 84.0 KJ kg^-1
C. 168.0 KJ kg^-1
D. 334.0 KJ kg^-1
E. 336.0 KJ kg^-1

Question 37:

• WAEC 1988

The temperature at which the water vapour present in the air is just sufficient to saturate it is called the

A. Ice point
B. Boiling point
C. Steam point
D. Dew point
E. Saturation point

Question 38:

• WAEC 1988

Which of the following instrument may be used to measure the relative humidity?

A. Hydrometer
B. Barometer
C. Manometer
D. Hypsometer
E. Hygrometer

Question 39:

• WAEC 1988

Which of the following will affect the saturation vapour pressure of a liquid?

A. Temperature of the liquid
B. Humidity of air
C. Volume of vapour
D. Volume of the liquid
E. Mass of the liquid

Question 40:

• WAEC 1988

Which of the following statements is/are not correct about image formed by a plane mirror?
I. The magnification produced is 1
II. The image distance is same as the object distance
III. The image is real
IV. The image is laterally inverted

A. I only
B. II only
C. III only
D. I & II only
E. II & IV only