﻿ Medical Entrance Exam Question and Answers | Nuclei - Zigya

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# Nuclei

#### Multiple Choice Questions

1.

If radius of the  nucleus is taken to be RAl, then the radius of  nucleus is nearly

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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,

• m

• m

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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

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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

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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

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6.

The binding energy per nucleon of  nuclei are 5.60 MeV and 7.06 MeV, respectively. In the nuclear reaction, , the value of energy Q released is,

• 19.6 MeV

• -2.4 MeV

• 8.4 MeV

• 8.4 MeV

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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

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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

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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

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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

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