Waec Physics Past Questions and Answers

Question 31:

• WAEC 1988

A given mass of gas has a pressure of 80Nm^-2 at a temperature of 47^oC. If the temperature is reduced to 27^oC with the volume remaining constant, the new pressure is

A. 46.0 Nm^-2
B. 75.0 Nm^-2
C. 80.0 Nm^-2
D. 85.3 Nm^-2
E. 139.4 Nm^-2

Question 32:

• WAEC 1988

Which of the following is a reason why a concrete floor feels colder to the bare feet than a mat on the same floor during the rainy season?

A. A mat if s better conductor of heat than the feet
B. Mat losses heat to the bare feet at a faster rate than concrete floor
C. Mat losses heat to the bare feet while the concrete floor extracts heat from them
D. Concrete floor is a better conductor of heat than the mat
E. Mat is a better conductor of heat than the floor

Question 33:

• WAEC 1988

In which of the following is the expansion of solids a disadvantage?

A. The fitting of wheels in rims
B. Fire alarms
C. The thermostat
D. The bimatellic thermometer
E. The balance wheel of a watch

Question 34:

• WAEC 1988

Which of the following best explains a person suffers more severe burns when his skin is exposed to steam than when boiling water is poured onto his skin?

A. Steam is at a higher temperature than boiling water
B. Steam posses greater heat energy per unit-mass than boiling water
C. Steam spreads more easily over a wider area of the skin than boiling water
D. Steam panetrates more easily over a wider area of the skin than boiling water
E. The specific latent heat of vaporization is released in changing from boiling water to steam

Question 35:

• WAEC 1988

Which of the following statements about radiant heat is/are not correct?
I. radiant heat cannot travel through a vacuum
II. rough surfaces emit radiant heat more than polished surfaces
III. Dark surfaces absorb radiant heat more than bright surfaces

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