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Nuclei · Question 53

AIPMT 2005MCQEasy📈 Topic in 12% papers+4−1
1

In any fission process the ratio mass of fission productsmass of parent nucleus is

  1. equal to 1
  2. greater than 1
  3. less than 1
  4. depends on the mass of the parent nucleus.

Answer

(3) less than 1

Solution

In fission, a heavy nucleus splits into two medium-mass nuclei that have a higher binding energy per nucleon.

Energy Q = m c2 is released, where m = mass of parent nucleus − mass of fission products > 0

Mass of fission products < mass of parent nucleus, i.e. the ratio is less than 1.

Answer: (3)

AIPMT 2005

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2

Fission of nuclei is possible because the binding energy per nucleon in them

  1. increases with mass number at low mass numbers
  2. decreases with mass number at low mass numbers
  3. increases with mass number at high mass numbers
  4. decreases with mass number at high mass numbers.
AIPMT 2005
3

Which one of the following pairs of nuclei are isotones ?

  1. 34Se74, 31Ga71
  2. 38Sr84, 38Sr86
  3. 42Mo92, 40Zr92
  4. 20Ca40, 16S32
Out of syllabusAIPMT 2005
4

If M(A, Z), Mp and Mn denote the masses of the nucleus AZX, proton and neutron respectively in units of u (1 u = 931.5 MeV/c2) and BE represents its binding energy in MeV, then

  1. M(A, Z) = ZMp + (A - Z)Mn - BE
  2. M(A, Z) = ZMp + (A - Z)Mn + BE/c2
  3. M(A, Z) = ZMp + (A - Z)Mn - BE/c2
  4. M(A, Z) = ZMp + (A - Z)Mn + BE
AIPMT 2004
5

If in a nuclear fusion process the masses of the fusing nuclei be m1 and m2 and the mass of the resultant nucleus be m3, then

  1. m3 = m1 + m2
  2. m3 = |m1 - m2|
  3. m3 < (m1 + m2)
  4. m3 > (m1 + m2)
AIPMT 2004
6

A nucleus represented by the symbol AZX has

  1. Z neutrons and A - Z protons
  2. Z protons and A - Z neutrons
  3. Z protons and A neutrons
  4. A protons and Z - A neutrons
Out of syllabusAIPMT 2004
7

The half life of radium is about 1600 years. Of 100 g of radium existing now, 25 g will remain unchanged after

  1. 4800 years
  2. 6400 years
  3. 2400 years
  4. 3200 years
Out of syllabusAIPMT 2004
8

Solar energy is mainly caused due to

  1. burning of hydrogen in the oxygen
  2. fission of uranium present in the Sun
  3. fusion of protons during synthesis of heavier elements
  4. gravitational contraction
AIPMT 2003
9

The volume occupied by an atom is greater than the volume of the nucleus by a factor of about

  1. 101
  2. 105
  3. 1010
  4. 1015
AIPMT 2003
10

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
AIPMT 2003
11

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

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