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Nuclei · Question 14

NEET (UG) 2021MCQMedium📈 Topic in 50% papers+4−1
1

A radioactive nucleus ZAX Z-1B Z-3C Z-2D, where Z is the atomic number of element X. The possible decay particles in the sequence are :

  1. -, , +
  2. , -, +
  3. , +, -
  4. +, , -

Answer

(4) +, , -

Solution

-decay: Z decreases by 2; --decay: Z increases by 1; +-decay: Z decreases by 1.

X (Z) B (Z-1): Z falls by 1 +

B (Z-1) C (Z-3): Z falls by 2

C (Z-3) D (Z-2): Z rises by 1 -

Sequence: +, , -

Answer: (4)

Out of syllabusNEET (UG) 2021

Keep practising — Nuclei

2

The energy equivalent of 0.5 g of a substance is :

  1. 4.5 1013 J
  2. 1.5 1013 J
  3. 0.5 1013 J
  4. 4.5 1016 J
NEET (UG) 2020
3

When a uranium isotope 23592U is bombarded with a neutron, it generates 8936Kr, three neutrons and :

  1. 9140Zr
  2. 10136Kr
  3. 10336Kr
  4. 14456Ba
Out of syllabusNEET (UG) 2020
4

For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is

  1. 20
  2. 10
  3. 30
  4. 15
Out of syllabusNEET 2018
5

Radioactive material 'A' has decay constant '8 ' and material 'B' has decay constant ' '. Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material 'B' to that of 'A' will be e ?

  1. 17
  2. 18
  3. 19
  4. 1
Out of syllabusNEET 2017
6

The half-life of a radioactive substance is 30 minutes. The time (in minutes) taken between 40% decay and 85% decay of the same radioactive substance is

  1. 15
  2. 30
  3. 45
  4. 60
Out of syllabusNEET 2016 (Phase 2)
7

A nucleus of uranium decays at rest into nuclei of thorium and helium. Then

  1. The helium nucleus has more momentum than the thorium nucleus.
  2. The helium nucleus has less kinetic energy than the thorium nucleus.
  3. The helium nucleus has more kinetic energy than the thorium nucleus.
  4. The helium nucleus has less momentum than the thorium nucleus.
AIPMT 2015
8

If radius of the 2713Al nucleus is taken to be RAl, then the radius of 12553Te nucleus is nearly

  1. 35 RAl
  2. ( 1353 )1/3 RAl
  3. ( 5313 )1/3 RAl
  4. 53 RAl
Out of syllabusAIPMT 2015 (Cancelled)
9

The binding energy per nucleon of 73Li and 42He nuclei are 5.60 MeV and 7.06 MeV respectively. In the nuclear reaction 73Li + 11H 42He + 42He + Q the value of energy Q released is

  1. 19.6 MeV
  2. -2.4 MeV
  3. 8.4 MeV
  4. 17.3 MeV
AIPMT 2014
10

A radioactive X with a half life 1.4 109 years decays to 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. 1.96 109 years
  2. 3.92 109 years
  3. 4.20 109 years
  4. 8.40 109 years
Out of syllabusAIPMT 2014
11

A certain mass of Hydrogen is changed to Helium by the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is (given 1 u = 931 MeV)

  1. 6.675 MeV
  2. 13.35 MeV
  3. 2.67 MeV
  4. 26.7 MeV
NEET 2013

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