Physics – Class 12 Mock Test 8

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Question 1 of 10

1. What is the frequency of a photon whose energy is 66.3 eV?

81.6 × 10¹⁶ Hz

12.6 × 10¹⁶ Hz

1.6 × 10¹⁶ Hz

91.6 × 10¹⁶ Hz

Question 1 of 10

Question 2 of 10

2. The photoelectric effect is commonly found in solar panels.

False

True

Question 2 of 10

Question 3 of 10

3. If the frequency of the incident radiation is equal to the threshold frequency, what will be the value of the stopping potential?

Infinite

180 V

1220 V

Question 3 of 10

Question 4 of 10

4. According to Bohr’s principle, what is the relation between the principal quantum number and the radius of the orbit?

r proportional to \(\frac {1}{n}\)

r proportional to \(\frac {1}{n^2}\)

r proportional to n²

r proportional to n

Question 4 of 10

Question 5 of 10

5. What is the cause of diffraction?

Reflection of primary wavelets

Interference of secondary wavelets

Interference of primary wavelets

Reflection of secondary wavelets

Question 5 of 10

Question 6 of 10

6. Which theory of light is wave theory or particle theory?

de – Broglie hypothesis

Static physics

Quantum mechanics

Dynamic physics

Question 6 of 10

Question 7 of 10

7. The sun gives light at the rate of 1500 W/m² of area perpendicular to the direction of light. Assume the wavelength of light as 5000Å. Calculate the number of photons/s arriving at 1 m² area at that part of the earth.

3.770 × 10¹¹

3.770 × 10²¹

3.770 × 10²⁰

4.770 × 10²¹

Question 7 of 10

Question 8 of 10

8. Which among the following shows the particle nature of light?

Polarization

Interference

Refraction

Photoelectric effect

Question 8 of 10

Question 9 of 10

9. Wave theory explains the photoelectric effect.

False

True

Question 9 of 10

Question 10 of 10

10. The size of the atom is proportional to which of the following?

A^2/3

A^1/3

A^-1/3

Question 10 of 10