# MCQ Questions forClass 12 Physics Chapter 11 Dual Nature of Radiation and Matter Questions with Answers

MCQ Questions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter with Answers

## CBSE: NCERT Solutions for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter MCQ’s with Answers

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## NCERT Physics MCQs for Class 12 Physics Chapter 11 Dual Nature of Radiation and Matter Question and Answers  PDF

Q1. De-Broglie equation states the:

(a) dual nature

(b) particle nature

(c) wave nature

(d) none of these

Q2. When an electron jumps across a potential difference of 1 V, it gains energy equal to :

(a) 1.602 × 10-19 J

(b) 1.602 × 1019 J

(c) 1.602 × 1024 J

(d) 1 J

Q3. The different stages of discharge in a discharge tube can be explained on the basis of:

(a) the wave nature of light

(b) the dual nature of light

(c) wave nature of electrons

(d) the collision between the charged particles emitted from the cathode the atoms of the gas in the tube

Answer:(d) the collision between the charged particles emitted from the cathode the atoms of the gas in the tube

Q4. Compared to liquids and solids, gases are:

(a) good conductors of electricity

(b) best conductors of electricity

(c) very poor conductors of electricity

(d) good or bad conductors of electricity depending upon the nature of the gas

Answer:(c) very poor conductors of electricity

Q5. The charge of a photo electron is :

(a) 9.1 × 10-31 C (b) 9.1 × 10-27 C

(c) 9.1 × 10-24 C (d) none of these

Q6. which Characteristic of a target does the Mosley’s law relate the frequency of X-rays?

(a) density (b) atomic number

(c) atomic weight (d) interatomic space

Q7. Evidence of the wave nature of light cannot be obtained from:

(a) diffraction (b) interference

(c) doppler effect (d) reflection

Q8. 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

Q9. 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

Q10. 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

Q11. Which of the following radiations cannot eject photo electrons?

(a) ultraviolet (b) infrared

(c) visible (d) X-rays

Q12.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

Q13.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

Answer:(d) not deflected by electric and magnetic fields

Q14. Millikan’s oil drop experiment makes use of:

(a) Stokes’ law (b) Boyle’s law

(c) Gas equation (d) Bernoulli’s theorem

Q15. Name the scientists who first studied the passage of electricity through fluids to establish the electrical nature of matter:

(a)Millikan (b) Planck

Q16. The momentum of an electron that emits a wavelength of 2 Å. will be:

(a) 6.4 × 10-36 kgms-1 (b) 3.3 × 10-24 kgms-1

(c) 3.3 × 10-34 kgms-1 (d) none of these

Q17.The strength of photoelectric current depends upon :

(d) distance between anode and cathode

Q18. The work function of photoelectric material is 3.3 eV. The threshold frequency will be equal to:

(a) 8 × 1014 Hz

(b) 8 × 1010 Hz

(c) 5 × 1010 Hz

(d) 4 × 1014 Hz

Q19.In Thomson’s experiment number of parabola gives :

(a) the no. of electrons present in element

(b) the no. of proton present in element

(c) the no. of neutrons present in element

(d) the no. of isotopes of the element present

Answer:(d) the no. of isotopes of the element present

Q20.The ratio of specific charge of an alpha particle to the proton is:

(a) 1 : 2 (b) 2 : 1 (c) 4 : 1 (d) 1 : 4

Q21. Kinetic energy of emitted electrons depends upon :

(a) frequency

(b) intensity

(c) nature of atmosphere surrounding the electrons

(d) none of these

Q22.Protons and alpha particles have the same de-Broglie wavelength. What is same for both of them ?

(a) Energy (b) Time period

(c) Frequency (d) Momentum

Q23. Photoelectrons are being obtained by irradiating zinc by a radiation of 3100 Å. In order to increase the kinetic energy of ejected photoelectrons.

(a) the intensity of radiation should be increased.

(b) the wave length of radiation should be increased.

(c) the wavelength of radiation should be decreased.

(d) both wavelength and intesity of radiation should be increased.

Q24. For light of wavelength 5000 Å, the photon energy is nearly 2.5 eV. For X-rays of wavelength 1 Å, the photon energy will be close to:

(a) 2.5 × 5000 eV (b) 2.5 ÷ 5000 eV

(c) 2.5 × (5000)² eV (d) 2.5 ÷ (5000)² eV

Q25. The best metal to be used for photoemission is:

(a) Potassium (b) Lithium

(c) Sodium (d) Cesium

Q26. The threshold frequency for a certain metal is v0. When light of frequency v = 2v0 is incident on it, the maximum velocity of photo electrons is 4 × 106 ms-1. If the frequency of incident radiation is increased to 5 v0, then the maximum velocity of photo electrons (m/s) is

(a) 8 × 105 (b) 2 × 106 (c) 2 × 107 (d) 8 × 106

Q27.Which of the following is not the property of photons

(a) charge (b) rest mass (c) energy (d) momentum

Q28. When light is directed at the metal surface, the emitted electrons:

(a) are called photons

(b) have energies that depend upon the intensity of light.

(c) have random energies.

(d) have energies that depend upon the frequency of light.

Answer:(d) have energies that depend upon the frequency of light.

Q29.The wavelength associated with n electron is 1Å. The potential difference required for accelerating it is

(a) 100 V (b) 150 V (c) 250 V (d) 10³ V