Waec Physics 1996 Past Questions and Answers

Question 21:

• WAEC 1996

The inside of a vacuum flask is usually coated with silver to reduce heat lost by

A. Convection
B. Conduction
C. Radiation
D. Absorption
E. Evaporation

Question 22:

• WAEC 1996

The saturated vapour pressure of a liquid increases as the

A. Volume of the liquid increases
B. Volume of the liquid decreases
C. Temperature of the liquid increases
D. Temperature of the liquid decreases
E. Mass of the liquid decreases

Question 23:

• WAEC 1996

Cloud formation is the direct result of

A. Precipitation
B. Vaporization
C. Fusion
D. Sublimation
E. Condensation

Question 24:

• WAEC 1996

Water boils at a lower temperature when heated at the top of a mountain than at sea-level because at the top of the mountain the

A. Saturation vapour pressure of water is higher than at sea-level
B. Sun adds more heat to the water
C. Temperature is lower than at sea- level
D. Relative humidity of the atmosphere is lower
E. Pressure of the atmosphere is lower

Question 25:

• WAEC 1996

The main reason why rice cooks faster in a pressure cooker than in cooking pot is that

A. Less heat escapes from the cooker
B. The vapour pressure in the cooker is constant
C. The rice is not affected by the draught over the cooker
D. The vapour pressure in the cooker decreases
E. The boiling point of water in the cooker is raised.