Waec Physics 2013 Past Questions and Answers

Question 16:

• WAEC 2013

The magnitude of the expansion or contraction of a substance depends on the i. temperature change ii. nature of the substance iii. size of the substance. Which of the statements above are correct?

A. I and ii only
B. Ii and iii only
C. I and iii only
D. I, ii and iii

Question 17:

• WAEC 2013

Highly polished silvery surfaces are

A. Poor absorbers and poor emitters of radiation
B. Poor absorbers and good emitters of radiation
C. Good absorbers and poor emitters of radiation
D. Good absorbers and good emitters of radiation

Question 18:

• WAEC 2013

The volume of a given mass of gas at 27^oC and 800 mmHg is 76cm². Calculate its volume at s.t.p

A. 100.0 cm³
B. 72.8 cm³
C. 60.0 cm³
D. 36.4 cm³

Question 19:

• WAEC 2013

Ice of mass 10g at 5°C was completely converted to water at 0°C, calculate the quantity of heat used. [specific heat capacity of ice = 2.1 Jg\(^{-1}\)K\(^{-1}\), specific latent heat of fusion of ice = 336 Jg\(^{-1}\)]

A. 105J
B. 3255J
C. 3465J
D. 16821J

Question 20:

• WAEC 2013

An electric heater has a resistance of 50\(\Omega\). When it is immersed in water and connected to mains source, it draws a current of 4.0A. Calculate the heat gained by the water if the heater is switched on for 2 minutes, assuming no heat losses to the surroundings

A. 4200J
B. 1600J
C. 24000J
D. 96000J