CBSE Class 12 Physics Dual Nature Of Radiation And Matter Notes Set A

Dual Nature Of Radiation And Matter MCQ Questions with Answers Class 12 Physics 

Question- The particle nature of light is not confirmed by

(a) photoelectric effect

(b) scattering of X-rays by electrons

(c) diffraction of electrons

(d) compton effect

Answer-(c)

Question-  The photoelectric current does not depend upon the
(i) frequency of incident light
(ii) work function of the metal
(iii) stopping potential
(iv) intensity of incident light

(a) (i) and (iv) only

(b) (ii) and (iii) only

(c) (iii) only

(d) (ii) only

Answer-(c)

Question- A discharge takes place between the two electrodes on applying the electric field to the gas in the discharge tube. The cause of this fluorescence was attributed to

(a) the radiations which appeared to be coming from the anode

(b) the radiation which appeared to be coming from the cathode

(c) the protons coming from the cathode

(d) the protons coming from the anode

Answer-(b)

Question- Photoelectric emmision occurs only when the incident light has more than a certain minimum

(a) power

(b) wavelength

(c) intensity

(d) frequency

Answer-(d)

Question- In photoelectric effect, electrons are ejected from metals, if the incident light has a certain minimum

(a) wavelength

(b) frequency

(c) amplitude

(d) angle of incidence

Answer-(b)

Question- Which of the following when falls on a metal will emit photoelectrons ?

(a) UV radiations

(b) Infrared radiation

(c ) Radio waves

(d) Microwaves

Answer-(a)

Question- Photons are deflected by

(a) electric field only

(b) magnetic field only

(c) electromagnetic field

(d) None of these

Answer-(d)

Question- The work-function of a metal is

(a) the minimum current required to take out electron from the metal surface

(b) the maximum frequency required to take out electron from the metal surface

(c) the minimum amount of energy required to take out the electron from the metal surface

(d) None of these

Answer-(c)

Question- The work function of a metal is independent of
(i) nature of the surface of the metal
(ii) dimensions of the metal
(iii) properties of the metal
(iv) abundance of the metal

(a) (i) only

(b) (i) and (iii)

(c) (ii) and (iii)

(d) (ii) and (iv)

Answer-(d)

Question- Which of the following metals is not sensitive to visible light?

(a) Caesium

(b) Sodium

(c) Rubidium

(d) Cadmium

Answer-(d)

Question- Cathode ray consists of

(a) photons

(b) electrons

(c) protons

(d) α-particles

Answer-(b)

Question- A photosensitive substance emits _____when illuminated by light.

(a) only protons

(b) only neutrons

(c) electrons and protons

(d) only electrons

Answer-(d)

Question- Particle like behavior of light arises from the fact that each quanta of light has definite ...X... and a fixed value of ...Y.. just like a particle, Here, X and Y refer to

(a) frequency, energy

(b) shape, volume

(c) energy, frequency

(d) energy, momentum

Answer-(d)

Question- In a photon-particle collision, the quantity that does not remain conserved is

(a) total energy

(b) total momentum

(c) number of photons

(d) None of these

Answer-(c)

Question- In which of the following, emission of electrons does not take place?

(a) Thermionic emission

(b) X-rays emission

(c) Photoelectric emission

(d) Secondary emission

Answer-(b)

Question- It is essential to consider light as a stream of photons to explain

(a) diffraction of light

(b) refraction of light

(c) photoelectric effect

(d) reflection of light

Answer-(c)

Question- Photoelectric effect can be explained by

(a) wave theory of light

(b) Bohr’s theory

(c) quantum theory of light

(d) corpuscular theory of light

Answer-(d)

Question- The theory of quantisation of electric charge was given by

(a) William Crookes

(b) J. J. Thomson

(c) R.A. Millikan

(d) Wilhelm Hallwachs

Answer-(c)

Question- In Einstein’s picture of Photoelectric emission, the photoelectric emission does not take place by

(a) continuous emission of energy from radiation

(b) continuous absorption of energy from radiation

(c) discrete absorption of energy from radiation

(d) discrete emission of energy from radiation

Answer-(b)

Question- The wave theory of light does not explain

(a) polarisation

(b) diffraction

(c) photocurrent

(d) interference

Answer-(c)

Question- Electrically, photons are

(a) positively charged

(b) negatively charged

(c) neutral

(d) strongly charged, may be positive or negative

Answer- (c)

Question- Of the following properties, the photon does not possess

(a) rest mass

(b) momentum

(c) energy

(d) frequency

Answer-(a)

Question- The stopping potential is directly related to

(a) the work function of the metal

(b) intensity of incident radiation

(c) the saturation current for the given frequency

(d) the kinetic energy gained by the photoelectrons

Answer-(d)

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