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Tuesday, 19 May 2026
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Physics Past Questions and Answers

Jamb 1987 Physics Questions

Question 16:
Hot water is added to three times its mass of water at 10oC and the resultant temperature is 20oC. What is the initial temperature of the hot water?
  • A 100<sup style='font-size: smaller;'>o</sup>C
  • B 80<sup style='font-size: smaller;'>o</sup>C
  • C 50<sup style='font-size: smaller;'>o</sup>C
  • D 40<sup style='font-size: smaller;'>o</sup>C
View Answer & Explanation
Question 17:
22,000J of heat is required to raise the temperature of 1.5kg of paraffin from 20oC to 30oC. Calculate the specific heat capacity of paraffin.
  • A 1466Jkg<sup style='font-size: smaller;'>-1</sup><sup style='font-size: smaller;'>o</sup>C<sup style='font-size: smaller;'>-1</sup>
  • B 2933Jkg<sup style='font-size: smaller;'>-1</sup><sup style='font-size: smaller;'>o</sup>C<sup style='font-size: smaller;'>-1</sup>
  • C 4400Jkg<sup style='font-size: smaller;'>-1</sup><sup style='font-size: smaller;'>o</sup>C<sup style='font-size: smaller;'>-1</sup>
  • D 5866Jkg<sup style='font-size: smaller;'>-1</sup><sup style='font-size: smaller;'>o</sup>C<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 18:
In which of the following are the substance arranged in descending order of their thermal conductivities?
  • A Copper, steel, glass
  • B Steel, copper, glass
  • C Steel, glass, copper
  • D Copper, glass, steel
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Question 19:
The vacuum in a thermos flask helps to reduce heat transfer by?
  • A Convection and radiation
  • B Convection and conduction
  • C Conduction and radiation
  • D Radiation only
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Question 20:
Which of the following phenomena explains the fact that a house whose roof is coated with white paint will be cooler in the hot season than one coated with black paint ?
  • A Conduction
  • B Convection
  • C Refraction
  • D Reflection
View Answer & Explanation