12th physics chapter 11: full solution, notes, MCQ, & free PDF | Bihar board

1. Who established that electric charge is quantised?

• • (a) J.J. Thomson
  • (b) William Crookes
  • (c) R.A. Millikan
  • (d) Wilhelm Rontgen

Answer: (c) R.A. Millikan

2. Cathode rays were discovered by

• • (a) Maxwell Clerk James
  • (b) Heinrich Hertz
  • (c) William Crookes
  • (d) J.J. Thomson

Answer: (c) William Crookes

3. The minimum energy required for the electron emission from the metal surface can be supplied to the free electrons by which of the following physical processes?

• • (a) Thermionic emission
  • (b) Field emission
  • (c) Photoelectric emission
  • (d) All of these

Answer: (d) All of these

4. The phenomenon of photoelectric emission was discovered in 1887 by

• • (a) Albert Einstein
  • (b) Heinrich Hertz
  • (c) Wilhelm Hallwachs
  • (d) Philipp Lenard

Answer: (b) Heinrich Hertz

5. A metal surface ejects electrons when hit by green light but nothing when hit by yellow light. The electrons will be ejected when the surface is hit by

• • (a) blue light
  • (b) heat rays
  • (c) infrared light
  • (d) red light

Answer: (a) blue light

6. Which of the following statements is correct regarding the photoelectric experiment?

• • (a) The photocurrent increases with intensity of light.
  • (b) Stopping potential increases with increase in intensity of incident light.
  • (c) The photocurrent increases with increase in frequency.
  • (d) All of these

Answer: (a) The photocurrent increases with intensity of light.

7. In photoelectric effect, the photocurrent

• • (a) depends both on intensity and frequency of the incident light.
  • (b) does not depend on the frequency of incident light but depends on the intensity of the inci-dent light.
  • (c) decreases with increase in frequency of inci-dent light.
  • (d) increases with increase in frequency of inci-dent light.

Answer: (b) does not depend on the frequency of incident light but depends on the intensity of the inci-dent light.

8. The maximum value of photoelectric current is called

• • (a) base current
  • (b) saturation current
  • (c) collector current
  • (d) emitter current

Answer: (b) saturation current

9. In photoelectric effect, the photoelectric current is independent of

• • (a) intensity of incident light
  • (b) potential difference applied between the two electrodes
  • (c) the nature of emitter material
  • (d) frequency of incident light

Answer: (d) frequency of incident light

10. In photoelectric effect, stopping potential depends on

• • (a) frequency of incident light
  • (b) nature of the emitter material
  • (c) intensity of incident light
  • (d) both (a) and (b)

Answer: (d) both (a) and (b)

11. According to Einstein’s photoelectric equation, the graph of kinetic energy of the photoelectron emitted from the metal versus the frequency of the incident radiation gives a straight line graph, whose slope

• • (a) depends on the intensity of the incident radi-ation.
  • (b) depends on the nature of the metal and also on the intensity of incident radiation.
  • (c) is same for all metals and independent of the intensity of the incident radiation.
  • (d) depends on the nature of the metal.

Answer: (c) is same for all metals and independent of the intensity of the incident radiation.

12. Which phenomenon best supports the theory that matter has a wave nature?

• • (a) Electron momentum
  • (b) Electron diffraction
  • (c) Photon momentum
  • (d) Photon diffraction

Answer: (b) Electron diffraction

bihar board 12th physics chapter 11 most mcq solution

13. Which of the following radiations cannot eject photo electrons ?

• • (A) ultraviolet
  • (B) infrared
  • (C) visible
  • (D) X-rays

Answer: (B) infrared

14. Evidence of the wave nature of light cannot be obtained from:

• • (A) diffraction
  • (B) interference
  • (C) doppler effect”
  • (D) reflection

Answer: (D) reflection

15. The charge of a photo electron is : 

• • (A) 9.1 x 10^-31 C
  • (B) 9.1 x 10^-27 C
  • (C) 9.1 x 10^-24 C
  • (D) none of these

Answer: (D) none of these

16. A photocell converts light energy into : 

• • (A) electrical energy
  • (B) magnetic energy
  • (C) sound energy
  • (D) None of these

Answer: (B) magnetic energy 

17. In which of the following phenomenon does light intera with matter ?

• • (A) diffraction
  • (B) polarisation
  • (C) dispersion
  • (D) photoelectric effect

Answer: (A) diffraction 

18. Photoelectric effect was discovered by : 

• • (A) Hertz
  • (B) Hallwaqchs
  • (C) Lenard
  • (D) MKillikan

Answer: (A) Hertz 

19. Photoelectric effect can be caused by : 

• • (A) X-rays
  • (B) Visible light
  • (C) γ-rays
  • (D) All of these

Answer: (D) All of these

20. β-rays are deflected in: 

• • (A) gravitational field
  • (B) only in magnetic field
  • (C) only in electric field
  • (D) both in magnetic and electric fields

Answer: (D) both in magnetic and electric fields

21. The energy of a photon of wavelength λ is: 

• • (A) hcλ
  • (B) hc / λ
  • (C) hλ / c
  • (D) λ / hc

Answer: (B) hc / λ

22. When light enters into glass its Wavelength :

• • (A) Decreases
  • (B) Increases
  • (C) Remains the same
  • (D) None of these

Answer: (A) Decreases 

23. The energy of emitted photo electron depends upon : 

• • (A) Intensity of light
  • (B) Wave length of light
  • (C) Work-function of metal
  • (D) None of these

Answer: (B) Wave length of light 

24. The minimum angular momentum of electron in Hydrogen atom will be: 

• • (A) h / π Js
  • (B) h / 2π Js
  • (C) hπ Js
  • (D) 2π h Js

Answer: (B) h / 2π Js

25. Life of a fossil in estimated by : 

• • (A) carbon dating
  • (B) X-ray
  • (C) y-ray
  • (D) laser

Answer: (A) carbon dating 

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02	Chemistry
03	Biology
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