Physics 2021 Jamb Past Questions and Answers

Question 11 :

• JAMB 2021

A solid weighs 10.00N in air, 6N when forcefully immersed in water, and 7.0N when fully immersed in a liquid, X. Calculate the relative density of the liquid X.

A. \(\frac{5}{3}\)
B. \(\frac{4}{3}\)
C. \(\frac{3}{4}\)
D. \(\frac{7}{10}\)

Question 12 :

• JAMB 2021

When the temperature of a liquid increases, its surface tension

A. Decreases
B. Increases
C. Remains constant
D. Increases then decreases

Question 13 :

• JAMB 2021

A gas at a volume of V\(_{0}\) in a container at pressure p\(_{0}\) is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?

A. \(\frac{p_{0}} {5}\)
B. \(\frac{4p_{0}}{5}\)
C. P\(_{0}\)
D. 5P\(_{0}\)

Question 14 :

• JAMB 2021

A piece of substance of specific heat capacity 450Jkg\(^{-1}\)k\(^{1}\) falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms\(^{-2}\)]


A. \(\frac{2}{9}\)ºC
B. \(\frac{4}{9}\)ºC
C. \(\frac{9}{2}\)ºC
D. \(\frac{9}{4}\)ºC

Question 15 :

• JAMB 2021

I. A liquid boils when its saturated vapor pressure is equal to the external pressure
II. Dissolved substances in pure water lead to an increase in the boiling point.
III. When the external pressure is increased, the boiling point increases.
IV. Dissolved substances in pure water decreases the boiling point

Which of the above combinations are peculiarities of the boiling point of a liquid?

A. I, II and III only
B. I, II, III, and IV
C. I, II, and IV
D. II, III, and IV