Class 12 Physics · Chapter 7 · Test 1
Binding Energy, Fission, Fusion
48 MCQs
48 questions · 40 min · 48 marks
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Sample questions
The first 5 of 48. Try each one, then tap to see the answer.
Question 1
Rutherford's experiments in 1911 indicated the existence of:
- AA dense positively charged nucleus of very small size
- BA uniformly positive atom
- CElectrons only
- DA neutral atom with no centre
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Answer: A
Rutherford's experiments indicated a dense positively charged central nucleus surrounded by electrons.
Question 2
The neutron was discovered in 1932 by:
- ARutherford
- BBohr
- CHahn
- DJames Chadwick
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Answer: D
James Chadwick discovered the neutron in 1932 as Rutherford had predicted.
Question 3
In the nuclide symbol Z stands for the:
- AMass number
- BNumber of neutrons
- CAtomic number (number of protons)
- DNumber of electrons only
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Answer: C
Z is the atomic or charge number and indicates the number of protons.
Question 4
The mass number A stands for the total number of:
- AProtons only
- BNeutrons only
- CElectrons
- DNucleons (protons and neutrons)
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Answer: D
A is the mass number and counts all the nucleons.
Question 5
The number of neutrons in a nucleus is given by:
- AA - Z
- BA + Z
- CZ - A
- DA × Z
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Answer: A
N = A - Z.
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