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Physics Past Questions and Answers

Topic: Relationship between saturated vapour pressure (S.V.P) and boiling

Jamb Physics Questions - Relationship between saturated vapour pressure (S.V.P) and boiling

Question 1:
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 2:
Which of the following conditions will make water boil at a temperature of 100oC when the atmospheric pressure is 750mmHg?
  • A Increase the external pressure
  • B Reduce the external pressure
  • C Heat more rapidly at the same pressure
  • D Reduce the external pressure by a quarter
View Answer & Explanation
Question 3:
A vapour is said to be saturated when
  • A More molecules return to the liquid than the amount that left it
  • B A dynamic equilibrium exists between the molecules of the liquid and the vapour molecules at a given temperature
  • C The vapour pressure is equal to the atmospheric pressure
  • D All molecules are moving with the same speed in all directions at a given temperature
View Answer & Explanation
Question 4:
I. A liquid boils when its saturated vapour pressure is equal to the external pressure
II. Dissolved substances in pure water lead to increase in the boiling point.
III. When the external pressure is increased, the boiling point increases.
IV. Dissolved substances in pure water decrease the boiling point.
Which combination of the above are peculiarities of the boiling point of a liquid?
  • A I, II and III
  • B I, II, III and IV
  • C I, II and IV
  • D II, III and IV
View Answer & Explanation
Question 5:
A vapour is said to be saturated when
  • A A dynamic equilibrium exists between liquid molecules and the vapour molecules
  • B A dynamic aquilibrium exists such that more molecules return to the liquid than are living it
  • C The temperature of the vapour varies
  • D The vapour pressure is atmospheric
View Answer & Explanation