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Nuclei · Question 62

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

The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of 42He is (Given helium nucleus mass ≈ 4.0015 u.)

  1. 0.0305 J
  2. 0.0305 erg
  3. 28.4 MeV
  4. 0.061 u

Answer

(3) 28.4 MeV

Solution

42He nucleus has 2 protons and 2 neutrons.

Mass defect, m = 2mp + 2mn - MHe

= 2(1.0073) + 2(1.0087) - 4.0015

= 4.0320 - 4.0015 = 0.0305 u

Binding energy = m 931.5 MeV

= 0.0305 931.5

28.4 MeV

Answer: (3)

AIPMT 2003

Keep practising — Nuclei

2

A sample of radioactive element has a mass of 10 g at an instant t = 0. The approximate mass of this element in the sample after two mean lives is

  1. 1.35 g
  2. 2.50 g
  3. 3.70 g
  4. 6.30 g
Out of syllabusAIPMT 2003
3

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
Out of syllabusAIPMT 2003
4

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

  1. -decay
  2. -decay
  3. fusion
  4. fission
Out of syllabusAIPMT 2003
5

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
6

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
7

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
8

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

  1. 105B
  2. 95B
  3. 114Be
  4. 42He
AIPMT 2001
9

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
10

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
11

Which rays contain (positive) charged particles?

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

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