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Nuclei · Question 64

AIPMT 2003MCQEasy📈 Topic in 0% papers+4−1
1

The mass number of a nucleus is

  1. always less than its atomic number
  2. always more than its atomic number
  3. sometimes equal to its atomic number
  4. sometimes less than and sometimes more than its atomic number

Answer

(3) sometimes equal to its atomic number

Solution

Mass number A = Z + N, where N is the number of neutrons (N 0).

⇒ A can never be less than Z, so (1) and (4) are wrong.

∵ For ordinary hydrogen 11H, N = 0, so A = Z = 1; hence (2) 'always more' is also wrong.

∴ The mass number is sometimes equal to the atomic number (and otherwise greater).

Answer: (3)

Out of syllabusAIPMT 2003

Keep practising — Nuclei

2

A nuclear reaction given by ZXA Z+1YA + -1e0 + represents

  1. -decay
  2. -decay
  3. fusion
  4. fission
Out of syllabusAIPMT 2003
3

Which of the following are suitable for the fusion process?

  1. light nuclei
  2. heavy nuclei
  3. elements lying in the middle of the periodic table
  4. middle elements, which are lying on binding energy curve.
AIPMT 2002
4

A deuteron is bombarded on 8O16 nucleus, then an -particle is emitted. The product nucleus is

  1. 7N13
  2. 5B10
  3. 4Be9
  4. 7N14
AIPMT 2002
5

A sample of radioactive element containing 4 1016 active nuclei. Half-life of element is 10 days, then number of decayed nuclei after 30 days

  1. 0.5 1016
  2. 2 1016
  3. 3.5 1016
  4. 1 1016
Out of syllabusAIPMT 2002
6

X(n, ) 73Li, then X will be

  1. 105B
  2. 95B
  3. 114Be
  4. 42He
AIPMT 2001
7

Mn and Mp represent the mass of neutron and proton respectively. An element having mass M has N neutrons and Z protons, then the correct relation will be

  1. M < \N Mn + Z Mp\
  2. M > \N Mn + Z Mp\
  3. M = \N Mn + Z Mp\
  4. M = N\Mn + Mp\
AIPMT 2001
8

Energy released in nuclear fission is due to

  1. some mass is converted into energy
  2. total binding energy of fragments is more than the binding energy of parental element
  3. total binding energy of fragments is less than the binding energy of parental element
  4. total binding energy of fragments is equal to the binding energy of parental element
AIPMT 2001
9

Which rays contain (positive) charged particles?

  1. -rays
  2. -rays
  3. -rays
  4. X-rays
Out of syllabusAIPMT 2001
10

Half life of a radioactive element is 12.5 hours and its quantity is 256 g. After how much time its quantity will remain 1 g?

  1. 50 h
  2. 100 h
  3. 150 h
  4. 200 h
Out of syllabusAIPMT 2001
11

Nuclear fission is best explained by

  1. liquid drop model
  2. Yukawa -meson theory
  3. independent particle model of the nucleus
  4. proton-proton cycle
AIPMT 2000

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