Waec Physics 1991 Past Questions and Answers

Question 16:

• WAEC 1991

A fixed mass of gas of volume 600cm³ at a temperature of 27^oC is cooled at constant pressure to a temperature of 0^oC. What is the change in volume?

A. 54cm²
B. 273cm²
C. 300cm²
D. 546cm²
E. 600cm²

Question 17:

• WAEC 1991

The boiling point of a liquid depends on the following except the

A. Nature of the liquid
B. External pressure
C. Volume of the liquid
D. Impurities present in the liquid
E. Degree of it's molecular cohesive force

Question 18:

• WAEC 1991

A team trap is a component of the apparatus used in determining the specific latent heat of vaporisation of steam. In the steady steady state, the steam trap

A. Stores the steam for future use
B. Prevents the steam from escaping
C. Ensures that only dry steam gets into the calorimeter
D. Allows condensed steam to go into the calorimeter
E. Determine the quantity of steam used

Question 19:

• WAEC 1991

a tap supplies water at 26^oC while another supplies water at 82^oC. If a man wishes to bathe with water at 40^oC the ratio of hot mass of hot water to that of cold water required is

A. 1:3
B. 3:1
C. 3:7
D. 7:3
E. 15:8

Question 20:

• WAEC 1991

Melting ice cools an orange drink far better than the same mass of ice-cold water because

A. Melting ice is lower temperature than ice-cold water
B. Water has a higher specific heat than ice
C. Ice floats and cools the air above the drink
D. Ice absorbs latent heat during melting
E. Ice makes better thermal contact than water