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Nuclei · Question 15

JEE Main 2025 (Online) 7th April Evening ShiftMCQEasy📈 Topic in 13% papers+4−1
1

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below :

  1. (A) is correct but (R) is not correct
  2. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
  3. (A) is not correct but (R) is correct
  4. Both (A) and (R) are correct and (R) is the correct explanation of (A)

Answer

(3) (A) is not correct but (R) is correct

Solution

Radius of a nucleus: R = R0 A1/3, so (R) is correct.

Mass of the nucleus A m (m = mass of a nucleon)

= A m 43 R03 A = 3m4 R03

Nuclear density is independent of A: the 6429Cu and 126C nuclei have the same density, so (A) is not correct.

Answer: (3)

JEE Main 2025 (Online) 7th April Evening Shift

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2

A radioactive material P first decays into Q and then Q decays to non-radioactive material R. Which of the following figure represents time dependent mass of P, Q and R ?

  1. [figure]
  2. [figure]
  3. [figure]
  4. [figure]
JEE Main 2025 (Online) 4th April Evening Shift
3

Match the LIST-I with LIST-II Choose the correct answer from the options given below:

  1. A-II, B-I, C-III, D-IV
  2. A-III, B-I, C-II, D-IV
  3. A-III, B-I, C-IV, D-II
  4. A-II, B-I, C-IV, D-III
JEE Main 2025 (Online) 3rd April Morning Shift
4

Energy released when two deuterons (1H2 ) fuse to form a helium nucleus (2He4 ) is : (Given : Binding energy per nucleon of 1H2 = 1.1 MeV and binding energy per nucleon of 2He4 = 7.0 MeV)

  1. 26.8 MeV
  2. 8.1 MeV
  3. 23.6 MeV
  4. 5.9 MeV
JEE Main 2025 (Online) 2nd April Evening Shift
5

Choose the correct nuclear process from the below options [p : proton, n : neutron, e- : electron, e+ : positron, : neutrino, : antineutrino]

  1. n p + e+ +
  2. n p + e- +
  3. n p + e+ +
  4. n p + e- +
JEE Main 2025 (Online) 28th January Morning Shift

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