Practice MCQ Questions and answers on Physics-GK Page-4 section-13

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31.
The energy of a photon, whose momentum is 10 MeV/c, where c is the speed of light, is given by

A. 10 MeV

B. 100 MeV

C. 1 MeV

D. 0.1 MeV

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32.
The energy of a photon varies directly with its

A. Wave length

B. Frequency

C. Speed

D. None of the above

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33.
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 statements is not correct?

A. The wavelength of X-ray photon is less than the wavelength of visible radiation photon.

B. Both the photons have different energies.

C. The speeds of both the photons in vacuum are different

D. The frequency of X-ray photon is higher than the frequency of visible radiation photon.

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34.
The threshold frequency is the frequency below which :

A. Photo current increases with voltage

B. Photo current decreases with voltage

C. Photo electric emission is not possible

D. Photo current is constant

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35.
Which of the following supports particle nature of photons ?

A. Diffraction

B. Polarization

C. Photoelectric effect

D. Interference

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36.
The reverse effect of X–ray emission is

A. Raman effect

B. Compton effect

C. Zeeman effect

D. Photoelectric

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37.
The term photon refers to

A. Light ray

B. Sub atomic particle

C. Radiation

D. None of the above

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38.
In a conductor

A. There is no conduction band

B. The forbidden energy gap is very wide

C. The forbidden energy gap is very narrow

D. The valence band and the conduction band overlap each other

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39.
The unit of intensity of electric field is

A. N/c

B. N/m

C. J/c

D. Volt

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40.
. . . . . . . . . exerts a force on anything that has an electric charge.

A. Electric field

B. Electrostatic force

C. Inductive field

D. All of the above

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Practice MCQ Questions and answers on Physics-GK

31. The energy of a photon, whose momentum is 10 MeV/c, where c is the speed of light, is given by

Answer & Solution

32. The energy of a photon varies directly with its

Answer & Solution

33. 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 statements is not correct?

Answer & Solution

34. The threshold frequency is the frequency below which :

Answer & Solution

35. Which of the following supports particle nature of photons ?

Answer & Solution

36. The reverse effect of X–ray emission is

Answer & Solution

37. The term photon refers to

Answer & Solution

38. In a conductor

Answer & Solution

39. The unit of intensity of electric field is

Answer & Solution

40. . . . . . . . . . exerts a force on anything that has an electric charge.

Answer & Solution

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31.
The energy of a photon, whose momentum is 10 MeV/c, where c is the speed of light, is given by

32.
The energy of a photon varies directly with its

33.
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 statements is not correct?

34.
The threshold frequency is the frequency below which :

35.
Which of the following supports particle nature of photons ?

36.
The reverse effect of X–ray emission is

37.
The term photon refers to

38.
In a conductor

39.
The unit of intensity of electric field is

40.
. . . . . . . . . exerts a force on anything that has an electric charge.