Waec Physics 1995 Past Questions and Answers

Question 11:

• WAEC 1995

A body weighing 10 N in air is partially immersed in water. It displaces water of mass 0.3 kg. What is the upthrust on the body? (g = 10 ms^-2)

A. 13.0 N
B. 7.0 N
C. 3.3N
D. 3.0N
E. 0.3 N.

Question 12:

• WAEC 1995

A mercury-in-glass thermometer reads - 20^o at the ice point and 100^o at the steam point. Calculate the celcius temperature corresponding to 70^o on the thermometer.

A. 41.0^oC
B. 50.0^oC
C. 62.5^oC
D. 70.0^oC
E. 75.0^oC.

Question 13:

• WAEC 1995

A brass rod is 2 m long at a certain temperature. Calculate the linear expansion of the rod for a temperature change of 100K. (Take the linear expansivity of brass as 1.8 x 10'5K").

A. 0.3600 m
B. 0.1800 m
C. 0.0360 m
D. 0.0036m
E. 0.0018 m

Question 14:

• WAEC 1995

A body of specific heat capacity 450J kg^-1 K^-1 falls to the ground from rest through a vertical height of 20m. Assuming conservation of energy, calculate the change in temperature of the body on striking the ground level. (g = 10ms^-2)

A. 0^oC
B. 2/9^oC
C. 4/9^oC
D. 9/4^oC
E. 9/2^oC

Question 15:

• WAEC 1995

Hot water at a temperature of t is added to twice that amount of water at a temperature of 30°C. If the resulting temperature of the mixture is 50°C. Calculate t.

A. 90^oC
B. 80^oC
C. 50^oC
D. 40^oC
E. 30^oC.