MCQ- 6 ICSE Physics class 10 ch-6 Modern Physics

Nuclear Fission and Fusion - Class 10 Physics

1. What is the key process in nuclear fission?

Combining two nuclei
Splitting a heavy nucleus
Producing alpha particles
Formation of gamma rays

Correct Answer: Splitting a heavy nucleus

2. What is the critical mass in nuclear fission?

Minimum temperature
Minimum mass of fissionable material
Maximum nuclear density
Maximum energy release

Correct Answer: Minimum mass of fissionable material

3. Which nuclear reaction is responsible for the energy of stars?

Nuclear fission
Nuclear fusion
Radioactive decay
Alpha decay

Correct Answer: Nuclear fusion

4. What is the difference between nuclear fission and fusion?

Fission splits nuclei, fusion combines nuclei
Fusion splits nuclei, fission combines nuclei
Both release gamma rays
Both require critical mass

Correct Answer: Fission splits nuclei, fusion combines nuclei

5. What is the main principle behind an atom bomb?

Controlled chain reaction
Uncontrolled chain reaction
Nuclear fusion
Controlled nuclear fusion

Correct Answer: Uncontrolled chain reaction