Physics 2021 Jamb Past Questions and Answers

Question 26 :

• JAMB 2021

A boy standing some distance from the foot of a tall cliff claps his hands and hears an echo 0.5s later. If the speed of sound is 340ms\(^{-1}\), how far is he from the cliff?

A. 680m
B. 170m
C. 34m
D. 85m

Question 27 :

• JAMB 2021

Which of the following is not a vector quantity?

A. Momentum
B. Force
C. Temperature
D. Displacement

Question 28 :

• JAMB 2021

Calculate the heat energy required to vaporize 50g of water initially at 80ºC if the specific heat capacity of water is 4.23jg\(^{-1}\)k\(^{-1}\) (specific latent heat of vaporization of water is 2260jg\(^{-1}\)

A. 530000J
B. 23200J
C. 17200J
D. 130000J

Question 29 :

• JAMB 2021

In a series R-L-C circuit at resonance, the voltages across the resistor and the inductors are 30V and 40V respectively.

What is the voltage across the capacitor?

A. 30V
B. 40V
C. 50V
D. 70V

Question 30 :

• JAMB 2021

If the frequency of an emitted x-ray is 1.6 x 10\(^{16}\)Hz, the accelerating potential is?

[e = 1.6 x 10\(^{-19}\)J, h = 6.63 x 10-\(^{34}\)Js]

A. 6630.0V
B. 663.0V
C. 66.3V
D. 6.6V