In This Post we are providing Chapter-13 Nuclei NCERT MCQ for Class 12 Physics which will be beneficial for students. These solutions are updated according to 2021-22 syllabus. These MCQS can be really helpful in the preparation of Board exams and will provide you with a brief knowledge of the chapter.
NCERT MCQ ON NUCLEI
Q.1. Cathode ray consists of
(a) photons
(b) electrons
(c) protons
(d) α-particles
Answer: (b)
Q.2. 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)
Q.3. The presently accepted value of charge/mass (e/m) is
(a) 1.66 x 10–19 c/kg
(b) 9.1 x 1011 c/kg
(c) 1.76 x 1011 c/kg
(d) 9.1 x 1019 c/kg
Answer: (c)
Q.4. 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)
Q.5. Photoelectric emission occurs only when the incident light has more than a certain minimum
(a) power
(b) wavelength
(c) intensity
(d) frequency
Answer: (d)
Q.6. 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)
Q.7. 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)
Q.8. The wave nature of light was established by (i) Maxwell’s equations (ii) Fraunhofer’s lines (iii) Hertz experiment (iv) Einstein’s theory
(a) (i) and (ii) only
(b) (ii) and (iv) only
(c) (i) and (iii) only
(d) (iii) and (iv) only
Answer: (c)
Q.9. 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)
Q.10. 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)
Q.11. The theory of quantization of electric charge was given by
(a) William Crookes
(b) J. J. Thomson
(c) R.A. Millikan
(d) Wilhelm Hallwachs
Answer: (c)
Q.12. 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)
Q.13. Which of the following metals is not sensitive to visible light?
(a) Cesium
(b) Sodium
(c) Rubidium
(d) Cadmium
Answer: (d)
Q.14. A photosensitive substance emits _____when illuminated by light.
(a) only protons
(b) only neutrons
(c) electrons and protons
(d) only electrons
Answer: (d)
Q.15. 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)
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