NEET Physics Composition and Size of Nuclei MCQS Set 01

a) protons and neutrons

b) electrons and protons

c) neutrons and electrons

d) electrons, protons and neutrons

Answer: protons and neutrons

Question: The radius of a nucleus is

a) directly proportional to the cube root of its mass number

b) None of these

c) inversely proportional to its atomic weight

d) directly proportional to its mass number

Answer: directly proportional to the cube root of its mass number

Question: A nuclei having same number of neutron but different number of protons / atomic number are called

a) isotopes

b) isomers

c) isotones

d) isobars

Answer: isotopes

Question: The radius of nucleus is of the order of

a) 10^–13 m

b) 10^–15 m

c) 10^–6 m

d) None of these

Answer: 10^–13 m

Question: The ratio of volumes of nuclei (assumed to be in spherical shape) with respective mass numbers 8 and 64 is

a) 0.125

b) 0.25

c) 2

d) 0.5

Answer:  0.125

Question: Nucleus of an atom whose atomic mass is 24 consists of

a) 11 protons and 13 neutrons

b) 11 protons and 13 electrons

c) 11 electrons, 13 protons and 11 neutrons

d) 11 electrons, 11 protons and 13 neutrons

Answer: 11 protons and 13 neutrons

Question: The mass number of He is 4 and that for sulphur is 32. The radius of sulphur nuclei is larger than that of helium by

a) 2

b) 8

c) 4

d) 6

Answer: 2

Question: Assertion : Neutrons penetrate matter more readily as compared to protons.
Reason : Neutrons are slightly more massive than protons

a) If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion

b) If Assertion is correct but Reason is incorrect

c) If both Assertion and Reason are correct and Reason is the correct explanation of Assertion

d) If both the Assertion and Reason are incorrect.

Answer: If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion

Question:  Which of the following statements are correct ?
I. Nuclear density is a constant for all matter.
II. Nuclear density is around 2.3 × 10¹⁷ kg/m³
II. Nuclear density is very large compared to ordinary matter.
IV. Mass of ordinary matter is mainly due to nucleus

a) I, II, III and IV

b) II and III

c) I, II and III

d) I and II

Answer: I, II, III and IV

Question: A nucleus splits into two nuclear parts which have their velocity ratio equal to 2 : 1. What will be the ratio of their nuclear radius?

a) 1 : 2^1/3

b) 1 : 3^1/2

c) 2^1/3 : 1

d) None of these

Answer:  1 : 2^1/3