CBSE Class 12 Physics Dual Nature of Radiation and Matter Quiz 2

1. Millikan's oil drop experiment makes use of:

A Stokes' law B Boyle's law C Gas equation D Bernoulli's theorem

2. 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

3. In photo electric emission, for alkali metals the threshold frequency lies in the:

A visible region B ultraviolet region C infrared region D far end of the infrared region

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

A ultraviolet B infrared C visible D X-rays

5. What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of V volts?

A \(\frac{12.3}{V^2}\) Å B \(\frac{12.3}{V}\) Å C \(\frac{12.2}{V^2}\) Å D None of these

6. What is the de-Broglie wavelength of an electron accelerated from rest through a potential difference of 100 volts?

A 12.3 Å B 1.23 Å C 0.123 Å D None of these

7. What is the de-Broglie wavelength of a proton accelerated from rest through a potential difference of V volts?

A \(\frac{12.3}{√V}\) Å B \(\frac{12.3}{V}\) Å C \(\frac{12.2}{V^2}\) Å D None of these

8. When a yellow light is incident on a surface, no electrons are emitted while green light can emit electrons. If the red light is incident on the surface then:

A no electrons are emitted B photons are emitted C electrons of higher energy are emitted D electrons of lower energy are emitted

9. The de-Broglie wavelength of particle of mass 1 mg moving with a velocity of 1 ms^-1, in terms of Planck's constant h, is given by (in metre):

A 10⁵ h B 10⁶ h C 10^-3 h D 10³ h

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

A diffraction B interference C doppler effect D reflection