Practice test

Atomic and nuclear physics - Test Set 3

Review 20 exam-focused questions with detailed explanations, then start the interactive test when you are ready.

20 questions

Questions and explanations

  1. Question 1

    If an electron and a photon have the same wavelength, then they will have the same:
    1. Velocity
    2. Linear momentum
    3. Angular momentum
    4. Energy
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  2. Question 2

    NDA 2018
    If a free electron moves through a potential difference of 1 kV, then the energy gained by the electron is given by
    1. 1.6* 10-19 J
    2. 1.6*10-16 J
    3. 1*10-19 J
    4. 1*10=16 J
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  3. Question 3

    Who among the following has explained the phenomenon of photoelectric effect?
    1. Max Planck
    2. Albert Einstein
    3. Neils Bohr
    4. Ernest Rutherford
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  4. Question 4

    For photoelectric effect to take place, the metal used as the cathode should have ……….
    1. High melting point
    2. Low melting point
    3. Low work function
    4. Low resistance
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  5. Question 5

    The wavelength of X-rays is of the order of the wavelength of X-rays:
    1. 1 Å
    2. 1 μm
    3. 1 mm
    4. 1 cm
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  6. Question 6

    In radio therapy, X-rays are used to:
    1. Detect bone fractures
    2. Treat cancer by controlled exposure
    3. Detect heart diseases
    4. None of the above
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  7. Question 7

    The reverse effect of X-ray emission is:
    1. Raman effect
    2. Compton effect
    3. Zeeman effect
    4. photoelectric effect
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  8. Question 8

    X-rays are:
    1. Deflected by an electric field but not by a magnetic field
    2. Deflected by a magnetic field but not by an electric field
    3. Deflected by both a magnetic field and an electric field
    4. Not deflected by an electric field and a magnetic field
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  9. Question 9

    Which one among the following waves carries the maximum energy per photon?
    1. X-rays
    2. Radio waves
    3. Light waves
    4. Microwaves
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  10. Question 10

    Which one of the following types of radiations has the smallest wavelength?
    1. Microwaves
    2. Infrared
    3. Visible light
    4. X-rays
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  11. Question 11

    UPRO/ARO (Pre) 2016
    Consider the following statements about nuclear fusion reactors.
    I. They work on the principle of fission of heavy nuclei.
    II. They usually have Tokamak design.
    III. They operate at very high temperature.
    Select the correct statements using the codes given below.
    1. I and III
    2. I and II
    3. II and III
    4. All of these
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  12. Question 12

    NDA 2017
    If the potential difference applied to an X-ray tube is doubled while keeping the separation between the filament and the target as same, what will happen to the cut-off wavelength?
    1. Will remain same
    2. Will be doubled
    3. Will be halved
    4. Will be four times of the original wavelength
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  13. Question 13

    A photon of X-ray has energy of 1 keV. A photon of visible radiation has energy of 3 eV. In this context, which one of the following statement(s) is/are not correct?
    1. The wavelength of X-ray photon is less than the wavelength of visible radiation photon.
    2. Both the photons have different energies.
    3. The speeds of both the photons in vacuum are different.
    4. The frequency of X-ray photon is higher than the frequency of visible radiation photon.
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  14. Question 14

    Infrared, visible and ultraviolet radiations/light have different properties. Which one of the following statements related to these radiations/ light is not correct?
    1. The wavelength of infrared is more than that of ultraviolet radiation.
    2. The wavelength of ultraviolet is smaller than that of visible light.
    3. The photon energy of visible light is more than that of infrared light.
    4. The photon energy of ultraviolet is less than that of visible light.
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  15. Question 15

    Consider the following statements about visible light, UV light and X-ray.
    I. The wavelength of visible light is more than that of X-ray.
    II. The energy of X-ray photons is higher than that of UV light photons.
    III. The energy of UV light photons is less than that of visible light photons.
    Which of the statement(s) given above is/are correct?
    1. I, II and III
    2. I and II
    3. II and III
    4. Only I
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  16. Question 16

    Rutherford’s α- particle scattering experiment on thin gold foil was responsible for the discovery of :
    1. Electron
    2. Proton
    3. Atomic nucleus
    4. Neutron
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  17. Question 17

    Which is the most suitable unit for expressing nuclear radius?
    1. Micron
    2. Nanometer
    3. Fermi
    4. Angstrom
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  18. Question 18

    Radioactivity is measured by:
    1. GM counter
    2. polarimeter
    3. calorimeter
    4. colorimeter
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  19. Question 19

    Atomic mass of an element is equal to the sum of number of:
    1. Electrons and protons only
    2. Protons and neutrons only
    3. Electrons and neutrons only
    4. Electrons, protons and neutrons
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  20. Question 20

    An element has an atomic weight of W and an atomic number of N. The number of protons in the nucleons of its atom is:
    1. N
    2. W
    3. W-N
    4. W+N
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