MCQ Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter

MCQ’s For All Chapters – Physics Class 12th

1. There will be total 10 MCQ in this test.
2. Please keep a pen and paper ready for rough work but keep your books away.
3. The test will consist of only objective type multiple choice questions requiring students to mouse-click their correct choice of the options against the related question number.
4. No negative marking for incorrect choice.
5. Please click on “Finish the Test” when you want to exit.
6. All the best – Happy Studying.

1. Photons of frequency f is incident on a metal surface of threshold frequency f₀ . The maximum K.E. of emitted photoelectrons is

h(f + f₀)

hf₀

h(f - f₀)

hf

Question 1 of 10

2. The photoelectric threshold frequency of a metal is f₀. When light of frequency 4f₀ is incident on the metal, the maximum K.E. of the emitted electron is

2 hf₀

4 hf₀

3 hf₀

hf₀/ 2

Question 2 of 10

3. Sodium surface is illuminated by ultraviolet and visible radiation successively and the stopping potential determined. The stopping potential is

Greater with visible light

Equal in both cases

Greater with ultraviolet light

Infinite in both cases

Question 3 of 10

4. Light of frequency 1.5 times the threshold frequency is incident on a photosensitive material .If the frequency is halved and the intensity is doubled, the photoelectric current becomes

Doubled

Quadrupled

Halved

zero

Question 4 of 10

5. Light of wavelength 4000 Ao is incident on a metal of work function 3.2 x 10^-19 J.
What is the maximum kinetic energy of the emitted electron?

2.2 x 10^-19 J

1.75 x 10^-19 J

0.75 x 10^-19 J

1.1 x 10^-19 J

Question 5 of 10

6. Light from a bulb is falling on a wooden table but no photo electrons are emitted as

Work function of wood is less

Work function of wood is more

It depends on the frequency

It is independent of work function

Question 6 of 10

7. Photons of energy 6 eV are incident on a potassium surface of a work function 2.1 eV. What is the stopping potential?

-3.9V

-8.1V

-5V

-1.9V

Question 7 of 10

8. The energy of the incident photon is 20 eV and the work function of the photosensitive metal is 10 eV. What is the stopping potential?

30 V

5 V

10 V

15 V

Question 8 of 10

9. Light of two different frequencies whose photons have energies of 1eV and 2.5 eV respectively successively illuminate a metal of work function 0.5eV. The ratio of maximum speed of emitted electrons is

1:5

1:4

1:3

1:2

Question 9 of 10

10. A photosensitive material would emit electrons if exited by photons beyond a threshold. To cross the threshold, you would increase

Frequency of light

Wavelength of light

Intensity of light

Amplitude of light

Question 10 of 10

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