Waec Physics 2007 Past Questions and Answers

Question 21:

• WAEC 2007

A cube made of metal of linear expansivity \(\alpha\) is heated through a temperature \(\theta\). If the initial volume of the cube is V_o, the correct expression for the increase in volume of the cube is

A. \(\frac{1}{3} \alpha V_o \theta\)
B. \(\frac{1}{2} \alpha V_o \theta\)
C. \(2 \alpha V_o \theta\)
D. \(3 \alpha V_o \theta\)

Question 22:

• WAEC 2007

A relative density bottle of volume 50cm³ is completely filled with a liquid at 30^oC. It is then heated to 80^oC such that 0.75cm³ of the liquid is expelled. Calculate the apparent cubic expansivity of the liquid.

A. 0.00030k^-1
B. 0.00032k^-1
C. 0.01970k^-1
D. 0.02030k^-1

Question 23:

• WAEC 2007

A body of mass 200g and specific heat capacity 0.4Jg^-1k^-1 cools from 37^oC to 31^oC. Calculate the quantity of the heat released by the body.

A. 4800J
B. 1200J
C. 480J
D. 202J

Question 24:

• WAEC 2007

According to the kinetic theory of gasses, which of the following property of a gas can be affected by the collision of the gas molecule with the walls of the container?

A. Temperature
B. Energy
C. Viscosity
D. Pressure

Question 25:

• WAEC 2007

The pressure of a fixed mass of an ideal gas at 27°C is 3 pa. The gas is heated at a constant volume until its pressure is 5 pa. Determine the new temperature of the gas.

A. 100^oC
B. 227^oC
C. 273^oC
D. 500^oC