Determination of specific heat capacity substances - Jamb Physics Past Questions and Answers

Question 11:

• JAMB 2006

An immersion heater rated 2.0A, 240V is used to boil water from temperature 52°c to 100°c. If the mass of the water is 2.5kg. determine the time taken to boil the water.
[specific heat capacity of water = 4.2 x 10³ jkg^-1 k^-1]

A. 1.05 x 10³s
B. 1.05 x 10⁵s
C. 1.05 x 10²s
D. 1.05 x 10⁴s

Question 12:

• JAMB 2007

2 kg of water is heated with a heating coil which draws 3.5 A from a 200 V mains for 2 minutes. what is the increase in temperature of the water?
[specific heat capacity of water = 4200 jkg ^-1k^-1]

A. 30°
B. 25°
C. 15°
D. 10°

Question 13:

• JAMB 2009

An electric heater rated 220v, 1000 w is immersed into a bucket full of water, calculate the mass of water if the temperature changes from 30°c to 100°c and the current flows for 300seconds.
[specific heat capacity of water = 4200 jkg^-1 K^-1]

A. 4.28 kg
B. 42.86 kg
C. 1.02 kg
D. 7.14 kg

Question 14:

• JAMB 2012

Calculate the mass of ice that would melt when 2kg of copper is quickly transferred from boiling water to a block of ice without heat loss;
Specific heat capacity of copper = 400JKg^-1K^-1
Latent heat of fusion of ice = 3.3 x 10⁵JKg^-1

A. 8/33kg
B. 33/80kg
C. 80/33kg
D. 33/8kg

Question 15:

• JAMB 2012

A metal of mass 0.5kg is heated to 100°C and then transferred to a well-lagged calorimeter of heat capacity 80JK^-1 containing water of heat capacity 420JK^-1 at 15°C. If the final steady temperature of the mixture is 25°C, find the specific heat capacity of the metal.

A. 877Jkg^-1K^-1
B. 286Jkg^-1K^-1
C. 133Jkg^-1K^-1
D. 92Jkg^-1K^-1