Physics 2021 Jamb Past Questions and Answers

Question 21 :

• JAMB 2021

If the fraction of the atoms of a radioactive material left after 120 years is 1/64, what is the half-life of the material?

A. 24 years
B. 20 years
C. 10 years
D. 2 years

Question 22 :

• JAMB 2021

A certain radioactive source emits radiation that was found to be deflected by both magnetic and electric fields. The radiation is?

A. Beta rays
B. Gamma rays
C. X-rays
D. Ultra-violet rays

Question 23 :

• JAMB 2021

The inner diameter of a test tube can be measured accurately using a?

A. Micrometer screw gauge
B. Pair of dividers
C. Meter rule
D. Pair of vernier calipers

Question 24 :

• JAMB 2021

Two bodies have masses in the ratio3:1. They experience forces which impart to them, acceleration in the ratio 2:9 respectively. Find the ratio of forces the masses experienced

A. 1:4
B. 2:1
C. 2:3
D. 2:5

Question 25 :

• JAMB 2021

Particles of mass 10\(^{-2}\)kg is fixed to the tip of a fan blade which rotates with angular velocity of 100rad\(^{-1}\). If the radius of the blade is 0.2m, the centripetal force is?

A. 2N
B. 20N
C. 200N
D. 400N