Quantity of Heat - Jamb Physics Past Questions and Answers

Question 11:

• JAMB 1992

How much heat is absorbed when a block of copper of mass 0.05kg and specific heat capacity 390Jkg^-1K^-1 is heated from 20^oC to 70^oC?

A. 39 . 98 x 10^-1J
B. 9.75 x 10²J
C. 3.98 x 10³J
D. 9.75 x 10³J

Question 12:

• JAMB 1994

When 100g of liquids L1 at 78°C was mixed with Xg of liquid L2 at 50°C, the final temperature was 66°C. Given that the specific heat capacity of L2is half that of L1, find x

A. 50g
B. 100g
C. 150g
D. 200g

Question 13:

• JAMB 1995

An electric kettle with negligible heat capacity is rated at 2000W. If 2.0kg of water is put in it, how long will it take the temperature of water to rise from 20^OC to 100^OC? [specific heat capacity of water = 4200Jkg^-1k^-1]

A. 420S
B. 336S
C. 168S
D. 48S

Question 14:

• JAMB 1995

A quantity of ice at 10^oC is heated until the temperature of the heating vessel is 90^oC. Which of the following constants is NOT required to determine the quantity of heat supplied to the vessel?

A. Specific heat capacity of ice
B. Specific heat capacity of water
C. Specific latent heat of fusion
D. Specific latent heat of vaporization

Question 15:

• JAMB 1998

A 500W heater is used to heat 0.6kg of water from 25^oC to 100^oC in t₂ seconds. If another 1000W heater is used to heat 0.2kg of water from 10^oC to 100^oC in t, seconds, find \(\frac {t_1}{t_2}\)

A. 50
B. 5
C. 5/4
D. 1/5