Physics 1990 Waec Past Questions and Answers

Question 16 :

• WAEC 1990

A cube made of a metal of linear expansivity is warmed through a temperature of t. lf the initial volume of the cube is V what is the increase in volume of the cube?

A. 1/3α Vt
B. 1/2α Vt
C. α Vt
D. 2α Vt
E. 3α Vt

Question 17 :

• WAEC 1990

Dry hydrogen is trapped by pellet of mercury in a uniform capillary tube closed at one end. If the length of the column of hydrogen at 27°C is 1.0m, at what temperature will the length be 1.20m?

A. 22.5^oC
B. 32.4^oC
C. 77.0^oC
D. 87.0^oC
E. 360.0^oC

Question 18 :

• WAEC 1990

Two solids P and Q of equal mass are heated to the same temperature and dropped simultaneously into two identical containers X and Y containing equal volumes of water at room temperature. The temperature of X will rise higher than that of Y only if the

A. Volume of P is greater than that of Q
B. Specific heat capacity of P is higher than that of Q
C. Density of P is greater than that of Q
D. Density of P is lower than that of Q
E. Specitic heat capacity of P is lower than that of Q.

Question 19 :

• WAEC 1990

lf the temperature of a small quantity of water in a closed container is gradually increased from 0^o to 40^oC then the density of the water within this range

A. Increases for a while and then decreases
B. Decreases for a while and then increases
C. Increases gradually
D. Decreases gradually
E. Remains the same

Question 20 :

• WAEC 1990

How much heat is given out when a piece of iron of mass 50g and specific heat capacity 460 Jkg^-1k^-1 cools from 85^oC to 25^oC?

A. 1.38 x 10⁶ J
B. 2.53x10⁴J
C. 7.66x10³J
D. 1.38x10³J
E. 1.27 X10³J