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Chapter 1: Electric Charges and Fields
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Chapter 2: Electrostatic Potential and Capacitance
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Chapter 3: Current Electricity
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Chapter 4: Moving Charges and Magnetism
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Chapter 5: Magnetism and Matter
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Chapter 6: Electromagnetic Induction
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Chapter 7: Alternating Current
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Chapter 8: Electromagnetic Waves
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Chapter 9: Ray Optics and Optical Instruments
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Chapter 10: Wave Optics
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Chapter 11: Dual Nature of Radiation and Matter
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Chapter 12: Atoms
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Chapter 14: Semiconductor Electronics Materials
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Chapter 15: Communication Systems
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1. |
The atomic number of an atom represents (a) number of neutrons in nucleus. (b) total number of protons and electrons in the atom. (c) number of protons in nucleus. (d) total number of protons and neutrons in nucleus. |
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2. |
Select the correct answer from the codes (a), (b), (c) and (d) as given below. Assertion (A): The nucleus Reason (R): (a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A). (b) Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A). (c) Assertion (A) is true, but Reason (R) is false. (d) Assertion (A) is false and Reason (R) is also false. |
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3. |
The mass density of a nucleus of mass number A is : (a) proportional to A1/ 3 (b) proportional to A2/ 3 (c) proportional to A3 (d) independent of A |
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4. |
Two nuclei have their mass numbers in the ratio of 8 : 1. The ratio of their nuclear densities is: (a) 8 : 1 (b) 4 : 1 (c) 2 : 1 (d) 1 : 1 |
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5. |
The radius of (a) |
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1.
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(i) Distinguish between isotopes and isobars.
(ii) Two nuclei have different mass numbers A1 and A2. Are these nuclei necessarily the isotopes of the same element? Explain.
(CBSE 2022, 2M)
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2.
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Obtain the first Bohr’s radius and the ground state energy of a muonic hydrogen atom i.e. an atom where the electron is replaced by a negatively charged muon (μ–) of mass about 207 me that orbits around a proton. (Given for hydrogen atom, radius of first orbit and ground state energy are 0·53×10–10 m and – 13·6 eV respectively)
(CBSE 2019, 3M)
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3.
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(a) Distinguish between isotopes and isobars, giving one example for each.
(b) Why is the mass of a nucleus always less than the sum of the masses of its constituents? Write one example to justify your answer.
(CBSE 2019, 3M)
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4.
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(a) Classify the following six nuclides into
(i) isotones,
(ii) isotopes, and
(iii) isobars :
 (b) How does the size of a nucleus depend on its mass number? Hence explain why the density of nuclear matter should be independent of the size of the nucleus.
(CBSE 2019, 3M)
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5.
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Show that the density of a nucleus is independent of its mass number.
Why are lighter nuclei more stable than heavier nuclei?
(CBSE 2023, 2M)
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Chemistry
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Biology
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Mathematics
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Physical Education
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Chapter Name
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Sub Topics of Chapter 13: Nuclei
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Nuclei
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13.1 Introduction
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13.2 Atomic Masses and Composition of Nucleus
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13.3 Nuclear Size and Density
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13.4 Binding Energy and Mass Defect
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13.5 Nuclear Force
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13.6 Radioactivity
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13.7 Laws of Radioactive Decay
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13.8 Nuclear Energy: Fission and Fusion
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is more stable than the nucleus
contains more number of protons.
nucleus is R. The radius of
nucleus will be
(b) 
(c) 
(d) 
