Class 11 Physics · Chapter 12 · Test 1
Nucleus and Antimatter
38 MCQs This test covers the structure and properties of the nucleus, nucleons, isotopes, atomic mass unit, and the four fundamental forces. It also covers matter and antimatter, positron, pair production, annihilation, and the readable exercise MCQs 12.3 and 12.5.
38 questions · 30 min · 38 marks
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Sample questions
The first 5 of 38. Try each one, then tap to see the answer.
Question 1
The charge on a proton is:
- A+1.6 x 10^-19 C
- B-1.6 x 10^-19 C
- CZero
- D+1.6 x 10^19 C
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Answer: A
A proton carries a charge equal in magnitude to that of an electron but positive.
Question 2
The neutron was discovered in 1932 by:
- AAnderson
- BChadwick
- CDirac
- DMaxwell
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Answer: B
James Chadwick discovered the neutron in 1932.
Question 3
Protons and neutrons together are called:
- ALeptons
- BMesons
- CNucleons
- DPhotons
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Answer: C
The particles inside the nucleus are collectively called nucleons.
Question 4
The atomic number Z of a nucleus is the number of:
- ANeutrons
- BNucleons
- CElectrons and neutrons
- DProtons
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Answer: D
Z is the number of protons in the nucleus.
Question 5
The mass number A of a nucleus is:
- AZ + N
- BZ - N
- CZ x N
- DN - Z
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Answer: A
A is the total number of nucleons so A = Z + N.
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