Short Quiz

Question 1 of 5

CBSE Past Year 2026

Nuclides with the same number of neutrons are called :

A Isobars B Isotones C Isotopes D Isomers

Select one option. Answers are shown after the test.

Question 2 of 5

CBSE Past Year 2026

Reason (A) : The mass of a nucleus is less than the sum of the masses of the constituent nucleons.

Reason (R) : Energy is absorbed when the nucleons are bound together to form a nucleus.

A Both Assertion and Reason are true, and Reason is the correct explanation of Assertion. B Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion. C Assertion is true, but Reason is false. D Both Assertion and Reason are false.

Select one option. Answers are shown after the test.

Question 3 of 5

CBSE Past Year 2026

Assertion (A) : Nuclear forces are always attractive.

Reason (R) : The nuclear force between protons and neutrons in a nucleus is a weak force.

A Both Assertion and Reason are true, and Reason is the correct explanation of Assertion. B Both Assertion and Reason are true, but Reason is not the correct explanation of Assertion. C Assertion is true, but Reason is false. D Both Assertion and Reason are false.

Select one option. Answers are shown after the test.

Question 4 of 5

CBSE Past Year 2026

The radius of a nucleus of mass number 125 is

A 6·0 fm B 30 fm C 72 fm D 150 fm

Select one option. Answers are shown after the test.

Question 5 of 5

CBSE Past Year 2026

If \(r_1\) and \(r_2\) are the radii of atomic nuclei of mass numbers 64 and 27 respectively, then the value of \(\left(\frac{r_1}{r_2}\right)\) is:

A 1 B \(\frac{4}{3}\) C \(\frac{3}{4}\) D \(\frac{27}{64}\)

Select one option. Answers are shown after the test.

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