CBSE Class 12 Nuclei Multiple Choice Questions with Answers. MCQ Questions Class 12 Nuclei with Answers Is Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Nuclei MCQs with Answers to know their preparation level.
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MCQ Questions Class 12 Nuclei with Answers - Set - 4
Question 1:
Radius of 1st Bohr orbit is a0 (= 0.529 Å) What is the radius of 2nd Bohr orbit?
(a) 10-8
(b) 2a0
(c) 4a0
(d) 2√2a0
Correct Answer – (C)
Question 2 :
An electron and a positron each having a mass equivalent to 0.53 MeV annihilate each other and produce a photon. The minimum energy of the photon is.
(a) 0.53 MeV
(b) 1.06 MeV
(c) 2.12 MeV
(d) zero
Correct Answer – (B)
Question 3 :
Rutherford is the unit of:
(a) radioactivity
(b) energy
(c) photoelectric current
(d) magnetic field
Correct Answer – (A)
Question 4 :
Alpha particle emitted from a radioactive material are:
(a) Helium nuclei
(b) Hydrogen nuclei
(c) Lithium nuclei
(d) None of the above
Correct Answer – (A)
Question 5 :
The density of a nucleus is of the order of:
(a) 1015 kg m-3
(b) 1018 kg m-3
(c) 1017 kg m-3
(d) 1016 kg m-3
Correct Answer – (C)
MCQ Questions Class 12 Nuclei with Answers
Question 6 :
The wavelength of y-rays is of the order of:
(a) 10-8 m
(b) 10-5 m
(c) 10-11 m
(d) 10-22 m
Correct Answer – (C)
Question 7 :
According to Yukawa’s theory of nuclear forces, the origin of nuclear force between nucleons is due to the exchange of
(a) mesons
(b) photons
(c) electrons
(d) positrons
Correct Answer – (B)
Question 8 :
The half life of a radioactive decay is n times its mean life, n is equal to:
(a) 0.6930
(b) 0.0693
(c) 1/0.6930
(d) 0.3070
Correct Answer – (A)
Question 9 :
When the mass of a sample of a radioactive substance decreases, the mean life of the sample:
(a) increases
(b) decreases
(c) remain unchanged
(d) first decreases then increases
Correct Answer – (C)
Question 10 :
Chadwick was awarded the Nobel prize in Physics in 1935 for his discovery of:
(a) electron
(b) proton
(c) neutron
(d) None of these
Correct Answer – (C)
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