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Sunday, 16 August 2026
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Physics Past Questions and Answers

Topic: Structure of Matter and Kinetic Theory

Jamb Physics Questions - Structure of Matter and Kinetic Theory

Question 31:
If a solid changes directly into a gas when heat is applied the process is called
  • A Vaporization
  • B Evaporation
  • C Sublimation
  • D Ionization
  • E Conversion
View Answer & Explanation
Question 32:
A small steel needle is carefully floated on water in a beaker. When a few drops of kerosine are introduced into the water the needle sink. Which of the following statements correctly explain(s) the observation? i. there is tension on the water surface ii. kerosine reduces the density of water so that needle becomes denser than water iii. kerosine reduces the surface tension of water
  • A I only
  • B Ii only
  • C Iii only
  • D I and ii
  • E I and iii
View Answer & Explanation
Question 33:
Which of the following statements describes an atom accurately? i. atoms of all elements are identical ii. an atom contains a nucleus and number of electrons iii. due to the electrons in the atom an atom is negatively charged iv. electrons in the atom move in circular orbits round the nucleus
  • A I and ii
  • B Ii and iii
  • C Iii and iv
  • D Ii and iv only
  • E I,ii and iii
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Question 34:
A given mass of an ideal gas occupies a volume V at a temperature T and under a pressure p. If the pressure is increased to 2p and the temperature reduced to \(\frac{1}{2T}\), then the percentage change in the volume of the gas is
  • A 0%
  • B 25%
  • C 75%
  • D 300%
  • E 400%
View Answer & Explanation
Question 35:
Which of the following properties of matter CANNOT be utilized for temperature measurement? The
  • A Length of a liquid column
  • B Volume of a gas at constant pressure
  • C Pressure of a gas at constant volume
  • D Resistance of a metallic wire
  • E Current produced in a photoelectric effect
View Answer & Explanation