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Nuclei · Question 47

AIPMT 2007MCQEasy📈 Topic in 50% papers+4−1
1

In a radioactive decay process, the negatively charged emitted -particles are

  1. the electrons produced as a result of the decay of neutrons inside the nucleus
  2. the electrons produced as a result of collisions between atoms
  3. the electrons orbiting around the nucleus
  4. the electrons present inside the nucleus

Answer

(1) the electrons produced as a result of the decay of neutrons inside the nucleus

Solution

As per NCERT, in - decay a neutron inside the nucleus is transformed into a proton:

n p + e- +

⇒ The electron so created is emitted at once as the - particle (with an antineutrino), and the atomic number increases by 1.

∵ Electrons are not present inside the nucleus, and orbital electrons or collisions between atoms do not give -rays,

∴ -particles are electrons produced by the decay of neutrons inside the nucleus.

Answer: (1)

Out of syllabusAIPMT 2007

Keep practising — Nuclei

2

If the nucleus 2713Al has a nuclear radius of about 3.6 fm, then 12552Te would have its radius approximately as

  1. 9.6 fm
  2. 12.0 fm
  3. 4.8 fm
  4. 6.0 fm
Out of syllabusAIPMT 2007
3

The binding energy of deuteron is 2.2 MeV and that of 42He is 28 MeV. If two deuterons are fused to form one 42He then the energy released is

  1. 30.2 MeV
  2. 25.8 MeV
  3. 23.6 MeV
  4. 19.2 MeV
AIPMT 2006
4

In a radioactive material the activity at time t1 is R1 and at a later time t2, it is R2. If the decay constant of the material is , then

  1. R1 = R2
  2. R1 = R2 e- (t1 - t2)
  3. R1 = R2 e (t1 - t2)
  4. R1 = R2(t2/t1).
Out of syllabusAIPMT 2006
5

The radius of germanium (Ge) nuclide is measured to be twice the radius of 94Be. The number of nucleons in Ge are

  1. 72
  2. 73
  3. 74
  4. 75
Out of syllabusAIPMT 2006
6

In the reaction 21H + 31H 42He + 10n, if the binding energies of 21H, 31H and 42He are respectively a, b and c (in MeV), then the energy (in MeV) released in this reaction is

  1. a + b + c
  2. a + b - c
  3. c - a - b
  4. c + a - b
AIPMT 2005
7

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.
AIPMT 2005
8

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
9

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
10

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
11

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

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