Physics 1992 Waec Past Questions and Answers

Question 16 :

• WAEC 1992

Which of the following colours of surfaces will radiate heat energy best?

A. Red
B. White
C. Black
D. Yellow
E. Blue

Question 17 :

• WAEC 1992

A gas which obeys Charles’ law exactly has a volume of 283cm³ at 10^oC. What is its volume at 30^oC?

A. 142cm³
B. 293cm³
C. 303cm³
D. 566cm³
E. 849cm³

Question 18 :

• WAEC 1992

Which of the following best explains why a person suffers a more severe burn when his skin is exposed to steam than when boiling water pours on his skin?

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

Question 19 :

• WAEC 1992

A small circular membrane is 10cm below the surface of a pool of mercury when the barometric height is 76 cm of mercury. If the density of mercury is 13600\(kgm^{-3}\), what is the pressure on the membrane in \(Nm^{-2}\)? \((g =10ms^{-2})\)

A. 1.17 x 10⁷ Nm^-2
B. 6.80 x 10⁵Nm^-2
C. 1.17x10⁵Nm^-2
D. 1.03 x 10⁵Nm^-2
E. 1.36 x10⁴ Nm^-2

Question 20 :

• WAEC 1992

Which of the following instruments is used to measure relative humidity?

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