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Monday, 17 August 2026
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Physics Past Questions and Answers

Topic: Quantity of Heat

Jamb Physics Questions - Quantity of Heat

Question 46:
An electric heating coil rated at 1Kw is used to heat 2kg of water for 2 minutes. The initial water temperature is 30\(^o\)C. Taking the specific heat of the water as 4,000Jkg \(^{-1}\) and neglecting that of the container, the final water temperature is
  • A 15.0\(^o\)C
  • B 45.0\(^o\)C
  • C 52.5\(^o\)C
  • D 60.0\(^o\)C
View Answer & Explanation
Question 47:
Water of mass 150g at 60\(^o\)c is added to 300g of water at 20\(^o\)c and the mixture is well stirred. Calculate the temperature of the mixture.(neglect heat losses to the surroundings)
  • A 33\(^o\)c
  • B 40\(^o\)c
  • C 25\(^o\)c
  • D 10\(^o\)c
View Answer & Explanation
Question 48:
Lamps in domestic lightings are usually in
  • A Series
  • B Divergent
  • C Convergent
  • D Parallel
View Answer & Explanation
Question 49:
The statement 'Heat lost by the hot body equals that gained by the cold one' is assumed when determining specific that heat capacity by the method of mixtures. Which of the following validates the assumption?
I. Lagging the Calorimeter
II. Ensuring that only S.I units are used
III. Weighing the calorimeter, the lid and the stirrer.
  • A I only
  • B I & II only
  • C I & III only
  • D II & III only
View Answer & Explanation
Question 50:
The following are some units
I. Ns
II. Non
III. Nm\(^{-2}\)
IV. J°K\(^{-1}\)
V. JKj\(^{-1}\)
What are the units of latent heat?
  • A I
  • B II
  • C III
  • D V
View Answer & Explanation