Waec Physics 2012 Past Questions and Answers

Question 21:

• WAEC 2012

In the formation of sea breeze. wind blows from

A. Sky to land
B. Sea to sky
C. Land to sea
D. Sea to land

Question 22:

• WAEC 2012

A piece of copper of mass 20g at a temperature of 110°C was dropped into a mixture of ice and water at 0°C. If the final steady temperature of the mixture is 0°C . Calculate the amount of ice that melted [Specific heat capacity of copper = 0.4 Jg\(^{-1}\)K\(^{-1}\), specific latent heat of fusion of ice = 330Jg\(^{-1}\)]

A. 0.37g
B. 0.60g
C. 2.40g
D. 2.70g

Question 23:

• WAEC 2012

Which of the following factors decreases the rate of evaporation of a liquid?

A. Increase in pressure over the liquid
B. Lowering the boiling point
C. Decreasing in humidity
D. Wind

Question 24:

• WAEC 2012

When two waves are superimposed on each other, the following occurrences are possible, except

A. Nodal lins
B. Anti nodal lines
C. Stationary waves
D. Dispersion

Question 25:

• WAEC 2012

Which of the following properties of waves is exclusive to transverse waves?

A. Reflection
B. Interference
C. Diffraction
D. Polarization