Physics 2021 Jamb Past Questions and Answers

Question 31 :

• JAMB 2021

Which of the following is not correct about the molecules of a substance in a gaseous state. They?

A. Are in a constant state of motion
B. Have different speeds
C. Have a temperature which is measured by the average kinetic energy
D. The collision between the gases is perfectly inelastic

Question 32 :

• JAMB 2021

A given mass of gas has a pressure of 80 Nm\(^{-2}\) at a temperature of 47 C. If the temperature is reduced to 27 C with volume remaining constant, the new pressure is?

A. 46.0 Nm\(^{-2}\)
B. 75.0 Nm\(^{-2}\)
C. 80.0 Nm\(^{-2}\)
D. 85.3 Nm\(^{-2}\)

Question 33 :

• JAMB 2021

0.5kg of water at 10ºC is completely converted to ice at 0ºC by extracting (88000) of heat from it. If the specific heat capacity of water is 4200jkg\(^{1}\) Cº. Calculate the specific latent heat of fusion of ice.

A. 9.0kjkg\(^{-1}\)
B. 84.0kjkg\(^{-1}\)
C. 134.0kjkg\(^{-1}\)
D. 168.0kjkg\(^{-1}\)

Question 34 :

• JAMB 2021

Which of the following instruments may be used to measure relative humidity?

A. Hydrometer
B. Manometer
C. Hygrometer
D. Hypsometer

Question 35 :

• JAMB 2021

A source of sound produces waves in air of wavelength 1.65m. If the speed of sound in air is 330ms\(^{-1}\), the period of vibration in air is?

A. 200
B. 0.005
C. 0.5
D. 0.02