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Sunday, 16 August 2026
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Physics Past Questions and Answers

Topic: Vapours

Jamb Physics Questions - Vapours

Question 1:
The temperature at which the water vapour present in the air saturates the air and begins to condense is known as
  • A Boiling point
  • B Melting point
  • C Triple point
  • D Dew point
  • E Critical temperature
View Answer & Explanation
Question 2:
When the vapour of a substance is in equilibrium with its own liquid, it is said to be
  • A Gaseous
  • B Unsaturated
  • C Liquefied
  • D Diffused
  • E Saturated
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Question 3:
A vapour is said to be saturated when
  • A Moer molecules return to the liquid than leave it
  • B A dynamic equilibrium exists between the liquid molecules and the vapour molecules at a given temperature
  • C The vapour pressure is atmospheric
  • D The temperature of the vapour varies
  • E All molecules are moving with the same speed
View Answer & Explanation
Question 4:
Which of the following may be used to determine the relative humidity in a physics laboratory
I. Manometer
II. Wet-and-Dry Bulb Hygrometer
III. Hair Hygrometer
IV. A Hydrometer
  • A I Only
  • B II and III Only
  • C II Only
  • D III Only
  • E II,IIIand IV Only
View Answer & Explanation
Question 5:
In an experiment in which molten naphthalene is allowed to cool, the cooling curve in fig 5 was obtained, the temperature \( 80^{\circ}C \) is known as
  • A Cooling temperature
  • B Boiling point
  • C Melting point
  • D Vaporization point
View Answer & Explanation