Waec Physics 2014 Past Questions and Answers

Question 21:

• WAEC 2014

A body of mass M kg rests on a plane inclined at an angle \(\theta\) to the horizontal. The component of the weight of the body parallel to the plane is

A. Mg sin \(\theta\)
B. Mg cos \(\theta\)
C. Mg tan \(\theta\)
D. Mg sec \(\theta\)

Question 22:

• WAEC 2014

A quantity of water at 20^oC is mixed with another quantity of water at 70^oC. The final steady temperature of the mixture is 40^oC. Determine the ratio of the mass of the cold water to that of the hot water

A. 7:2
B. 3:2
C. 2:5
D. 1:2

Question 23:

• WAEC 2014

The mass of an empty density bottle is 30g. When filled with a liquid, the mass reduces to 38g. Calculate the apparent cubic expansivity of the liquid

A. 6.25 x 10K^-1
B. 6.25 x 10^-3K^-1
C. 2.50 x 10^-3K^-1
D. 2.50 x 10^-4K^-1

Question 24:

• WAEC 2014

A car traveling at 30ms\(^{-1}\) overcomes a frictional resistance of 100N while moving. Calculate the power developed by the engine. [1 hp = 0.75 kW]

A. 0.23hp
B. 0.40hp
C. 4.00hp
D. 4.40hp

Question 25:

• WAEC 2014

The quality of a note depends on its

A. Frequency
B. Pitch
C. Overtones
D. Amplitude