Physics 1991 Waec Past Questions and Answers

Question 11 :

• WAEC 1991

A boatman facing north wants to cross a flowing river to a point directly opposite its position at the other bank. If the river is flowing eastwards, in what direction should he row his boat?

A. West
B. East
C. North-west
D. North-east
E. South-west

Question 12 :

• WAEC 1991

The diagram above represents six maximum and minimum thermometer. If the temperature of the surrounding falls, which of the following correctly states how the thermometer would respond to the change in temperature?

A. S₁, would move upward but S₂ would not move
B. S₁ would not move but S₂ would move upwards
C. Both S₁ and S₂ would move upwards
D. S₁ would move downwards and S₂ would move downwardw
E. S₁ would move downwards and S₂ wouldnmove downwards

Question 13 :

• WAEC 1991

A wire, 20m long is heated from a temperature of 5oC to 55oC. If the change in length is 0.020m, calculate the linear expansivity of the wire

A. 1.0 x 10^-3k^-1
B. 2.0 x 10^-4k^-1
C. 2.0 x 10^-5k^-1
D. 1.0 x 10^-5k^-1
E. 2.0 x 10^-6k^-1

Question 14 :

• WAEC 1991

A water fall is 420m high. Calculate the difference in temperature of the water between the top and bottom of the water fall. Neglect heat loses(g = 10.0m^-2 specific heat capacity of water = 4.20 x 10^-3 JKg^-1 K^-1)

A. 0.1^oC
B. 1.0^oC
C. 42^oC
D. 100^oC
E. 4.20^oC

Question 15 :

• WAEC 1991

The set-up illustrated above shows a capillary tube of uniform cross-sectional area in two different arrangements. Using the data in the diagrams. Calculate the pressure of the atmosphere

A. 76cm of Hg
B. 75cm of Hg
C. 74cm of Hg
D. 60cm of Hg
E. 45cm of Hg