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Nuclei · Question 68

AIPMT 2002MCQEasy📈 Topic in 25% papers+4−1
1

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

Answer

(3) 3.5 1016

Solution

Number of half-lives: n = 3010 = 3

Undecayed nuclei: N = N0 ( 12 )3 = 4 10168 = 0.5 1016

Decayed nuclei = N0 - N

= 4 1016 - 0.5 1016

= 3.5 1016

Answer: (3)

Out of syllabusAIPMT 2002

Keep practising — Nuclei

2

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

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

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
4

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
5

Which rays contain (positive) charged particles?

  1. -rays
  2. -rays
  3. -rays
  4. X-rays
Out of syllabusAIPMT 2001
6

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
7

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
8

For the given reaction, the particle X is 6C11 5B11 + + + X

  1. neutron
  2. anti neutrino
  3. neutrino
  4. proton
Out of syllabusAIPMT 2000
9

The relation between and T1/2 is ( T1/2 half-life)

  1. T1/2 = 2
  2. T1/2 2 =
  3. T1/2 = 1
  4. ( + T1/2) = 2
Out of syllabusAIPMT 2000

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