Search SchoolNGR

Saturday, 15 August 2026
Register . Login

Physics Past Questions and Answers

Topic: Change of State

Jamb Physics Questions - Change of State

Question 1:
An ice cube floats in a glass of water filled to the brim. What happens when the ice melts?
  • A The water level remains the same
  • B There is a drop in the level of water in the glass due to condensation on its outside
  • C The water in the glass overflows
  • D The level of water drops because melted ice occupies less volume
  • E None of the above is correct
View Answer & Explanation
Question 2:
The latent heat of fusion of ice is 80cal g-1. How much heat is required to change 10g of ice at QoC into water at the same temperature?
  • A 80 cal
  • B 10 cal
  • C 8 cal
  • D 800 cal
  • E 400 cal
View Answer & Explanation
Question 3:
The heat from the sun reaches the earth by the process
  • A Insulation
  • B Precipitation
  • C Conduction
  • D Convection
  • E Radiation
View Answer & Explanation
Question 4:
All the heat generated in a 5 ohms resistor by 2A flowing for 30 seconds is used to evaporate 5g of a liquid at its boiling point. Which of the following is the correct value of the specific latent heat of the liquid?
  • A 120J
  • B 60Jg<sup style='font-size: smaller;'>-1</sup>
  • C 120Jg<sup style='font-size: smaller;'>-1</sup>
  • D 1500J
  • E 1500Jg<sup style='font-size: smaller;'>-1</sup>
View Answer & Explanation
Question 5:
a pressure cooker saves both time and fuel in cooking because inside the cooker, the
  • A Boiling point of water is raised
  • B Pressure is constant
  • C Heat is completely trapped
  • D Temperature is evenly distributed
  • E Volume of steam varies
View Answer & Explanation