Dual Nature Of Matter And Radiation Mcq in English

Dual Nature Of Matter And Radiation Mcq in English | Class 12 Physics Mcq In English | Class 12 Dual Nature of Radiation and Matter MCQs | dual nature of radiation and matter important questions

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Dual Nature Of Matter And Radiation Mcq in English

1. Which one of the following is deflected in electric field ?

• (A) Gamma rays
• (B) X-rays.
• (C) Ultraviolet rays
• (D) Cathode rays

2. Wavelength of a particles of mass m moving with velocity V is

• (A) λ = mV / h
• (B) λ = h / mV
• (C) λ = h. mV
• (D) λ = mV / 2h

3. Who established that electric charge is quantised ?

• (A) J.J. Thomson
• (B) William Crookes
• (C) R.A. Millikan
• (D) Wilhelm Rontgen

4. Cathode rays were discovered by

• (A) Maxwell Clerk James
• (B) Heinrich Hertz
• (C) William Crookes
• (D) J. J. Thomson

5. The maximum value of photoelectric current is called

• (A) base current
• (B) saturation current
• (C) collector current
• (D) emitter current

6. Which of the following devices is sometimes called an electric eye?

• (A) LED
• (B) Photocell
• (C) Integrated chip (IC)
• (D) Solar cell

7. X-rays are

• (A) deflected by an electric field
• (B) deflected by a magnetic field
• (C) deflected by both electric and magnetic fields
• (D) not deflected by electric and magnetic fields

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

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

9. A photocell converts light energy into

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

10. When light enters into glass its Wavelength

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

11. The energy of emitted photo electron depends upon

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

12. The critical angle of light passing from glass to air is minimum for

• (A) Red colours
• (B) Green colour
• (C) Yellow colour
• (D) Violet colour

13. Transverse nature of light is shown by

• (A) Interference
• (B) Reflection
• (C) Polarisation
• (D) Dispersion

14. Kirchhoffe’s second law of conservation of

• (A) charge
• (B) energy
• (C) momentum
• (D) angular momentum

15. Life of a fossil in estimated by

• (A) carbon dating
• (B) X-ray
• (C) laser
• (D) none

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