Physics – Class 12 Mock Test 9

10%

Question 1 of 10

1. What is the reaction responsible for the production of light energy from the sun?

Nuclear

Emission

Fusion

Fission

Question 1 of 10

Question 2 of 10

2. The n-type semiconductor is which of the following?

Neutral

Negatively charged

Positively charged

Positive or negative depending upon doping materials

Question 2 of 10

Question 3 of 10

3. Which will be the unknown nucleus formed when ²²Ne₁₀ decays into two α-particles and an unknown nucleus?

Oxygen

Carbon

Fluorine

Neon

Question 3 of 10

Question 4 of 10

4. The operation of a nuclear reactor is said to be critical if the multiplication factor (k) has a value of what?

1.5

2.1

Question 4 of 10

Question 5 of 10

5. The manifestation of the band structure in solids is due to which of the following?

Heisenberg’s uncertainty principle

Bohr’s correspondence principle

Pauli’s exclusion principle

Boltzmann’s law

Question 5 of 10

Question 6 of 10

6. What is the half-time of a radioactive sample (in minutes), if its mean life is 200 s?

2.31 min

2 min

2.57 min

0.69 min

Question 6 of 10

Question 7 of 10

7. Identify the property which is not characteristic for a semiconductor?

At a very low temperature, it behaves like an insulator

The semiconductor is electrically neutral

The charge carriers are electrons and holes in the valence band at higher temperatures

At higher temperatures, two types of charge carriers will cause conductivity

Question 7 of 10

Question 8 of 10

8. An intrinsic semiconductor, at the absolute zero temperature, behaves like which one of the following?

n-type semiconductor

Insulator

p-type semiconductor

Superconductor

Question 8 of 10

Question 9 of 10

9. Controlled chain reactions form the basis of an atomic bomb.

True

False

Question 9 of 10

Question 10 of 10

10. Find the true statement.

The nuclear force is independent of charge

Nuclear charge is dependent on the charge

The nuclear force is weaker than the electromagnetic force

The nuclear force is weaker than the gravitational force

Question 10 of 10