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 Multiple Choice QuestionsMultiple Choice Questions

1.

If radius of the Al presubscript 13 presuperscript 27 nucleus is taken to be RAl, then the radius of Te presubscript 53 presuperscript 125 nucleus is nearly

  • open parentheses 53 over 13 close parentheses to the power of 1 third end exponent straight R subscript Al
  • 5 over 3 straight R subscript Al
  • 3 over 5 straight R subscript Al
  • 3 over 5 straight R subscript Al
660 Views

2.

When an alpha particle of mass m moving with velocity v bombards on a heavy nucleus of charge Ze, its distance of closest approach from the nucleus depends on mass as,

  • fraction numerator 1 over denominator square root of straight m end fraction
  • 1 over straight m squared
  • m

  • m

2165 Views

3.

The half-life to a radioactive nucleus is 50 days. The time interval (t2-t1) between the time t2 when 2/3 of  it has decayed and the time t1 when 1/3 of it had decayed is

  • 30 days

  • 50 days

  • 60 days

  • 15 days

1174 Views

4.

If the nuclear radius of27 Al is 3.6 Fermi, the approximate nuclear radius of 64Cu in Fermi is

  • 2.4

  • 1.2

  • 4.8

  • 4.8

933 Views

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5.

A mixture consists of two radioactive materials A1 and A2 with half-lives of 20 s and 10 s respectively. Initially, the mixture has 40 g of A1 and 160 g of A2. The amount of the two in the mixture will become equal after

  • 60 s

  • 80 s

  • 20 s

  • 20 s

921 Views

6.

The binding energy per nucleon of Li presubscript 3 presuperscript 7 space and space He presubscript 2 presuperscript 4 nuclei are 5.60 MeV and 7.06 MeV, respectively. In the nuclear reaction, Li presubscript 3 presuperscript 7 space plus space straight H presubscript 1 presuperscript 1 space rightwards arrow space He presubscript 2 presuperscript 4 space plus space straight Q, the value of energy Q released is,

  • 19.6 MeV

  • -2.4 MeV

  • 8.4 MeV

  • 8.4 MeV

1253 Views

7.

A radio isotope X with a half life 1.4 x 109 yr decays of Y which is stable. A sample of the rock from a cave was found to contain X and Y in the ratio 1:7. The age of the rock is,

  • 1.96 x 109 yr

  • 3.92 x 109 yr

  • 4.20 x 109 yr

  • 4.20 x 109 yr

1309 Views

8.

The half-life of radioactive isotope X is 20 yr. It decays to another element Y which is stable.The two elements X and Y were found to be in the ratio 1:& in a sample of given rock is estimated to be

  • 40 yr

  • 60 yr

  • 80 yr

  • 80 yr

1050 Views

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9.

A radioactive nucleus of mass M emits a photon of frequency v and the nucleus recoils.The recoil energy will be

  • h2v2 / 2Mc2

  • zero

  • hv

  • hv

1579 Views

10.

The power obtained in a reactor using U235 disintegration is  1000kW. The mass decay of U235 per hour is

  • 20 μg

  • 40 μg

  • μg

  • μg

1023 Views

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