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Physics Past Questions and Answers

Topic: Determination of specific heat capacity substances

Jamb Physics Questions - Determination of specific heat capacity substances

Question 1:
Heat is supplied uniformly at the rate of 100W to 1.0 x 10-2kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5oC, then the specific heat capacity of the liquid is
  • A 2.0 x 10<sup style='font-size: smaller;'>2</sup>Jkg<sup style='font-size: smaller;'>-1</sup>k<sup style='font-size: smaller;'>-1</sup>
  • B 2.0 x 10<sup style='font-size: smaller;'>2</sup>Jkg<sup style='font-size: smaller;'>-1</sup>
  • C 4.0 x 10<sup style='font-size: smaller;'>4</sup>Jkg<sup style='font-size: smaller;'>-1</sup>k<sup style='font-size: smaller;'>-1</sup>
  • D 4.0 x 10<sup style='font-size: smaller;'>4</sup>kg<sup style='font-size: smaller;'>-1</sup>
  • E 8.4 x 10<sup style='font-size: smaller;'>3</sup>Jkg<sup style='font-size: smaller;'>-1</sup>k<sup style='font-size: smaller;'>-1</sup>
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Question 2:
When two objects P and Q are supplied with the same quantity of heat, the temperature change in P is observed to be twice that of Q. The ratio of the specific heat capacity of P to Q is
  • A 1 : 4
  • B 4 : 1
  • C 1 : 1
  • D 2 : 1
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Question 3:
An electric heater is used to melt a block of ice of mass 1.5kg. If the heater is powered by a 12V battery and a current of 20A flows through the coil, calculate the time taken to melt the block of ice at 0oC. [specific latent heat of fusion of ice = 336 x 103Jkg-1]
  • A 76.0min
  • B 35.0min
  • C 21.0min
  • D 2.9min
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Question 4:
A 50W electric heater is used to heat a metal block of mass 5kg. If in 10 minutes a temperature rise of 12oC is achieved, the specific heat capacity of the metal is
  • A 400 J kg<sup style='font-size: smaller;'>-1</sup>K<sup style='font-size: smaller;'>-1</sup>
  • B 500 J kg<sup style='font-size: smaller;'>-1</sup>K<sup style='font-size: smaller;'>-1</sup>
  • C 390 J kg<sup style='font-size: smaller;'>-1</sup>K<sup style='font-size: smaller;'>-1</sup>
  • D 130 J kg<sup style='font-size: smaller;'>-1</sup>K<sup style='font-size: smaller;'>-1</sup>
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Question 5:
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 10<sup style='font-size: smaller;'>3</sup>s
  • B 1.05 x 10<sup style='font-size: smaller;'>5</sup>s
  • C 1.05 x 10<sup style='font-size: smaller;'>2</sup>s
  • D 1.05 x 10<sup style='font-size: smaller;'>4</sup>s
View Answer & Explanation