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Physics 2021 JAMB Past Questions

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16

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
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17

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
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18

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
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19

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
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20

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
View Answer & Discuss (4) JAMB 2021
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