In gamma-ray emission from a nucleus from Physics JEE Year 2007

Subject

Physics

Class

JEE Class 12

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 Multiple Choice QuestionsMultiple Choice Questions

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31.

In gamma-ray emission from a nucleus

  • both the neutron number and the proton number change

  • there is no change in the proton number and the neutron number

  • only the neutron number changes

  • only the neutron number changes


B.

there is no change in the proton number and the neutron number

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32.

If in a p-n junction diode, a square input signal of 10V is applied as shown Then the output signal across RL will be 

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33.

A photon of frequency v has a momentum associated with it. If c is the velocity of light, the momentum is

  • v /c

  • h v c

  • h v /c2

  • h v /c2

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34.

For the given uniform square lamina ABCD, whose centre is O,

  • square root of 2 space straight I subscript AC space equals space straight I subscript EF
  • IAD = 3IEF

  • IAC = IEF

  • IAC = IEF

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35.

The half-life period of a radio-active element X is same as the mean life-time of another radio-active element Y. Initially, they have the same number of atoms. Then

  • X will decay faster than Y

  • Y will decay faster than X

  • X and Y have same decay rate initially

  • X and Y have same decay rate initially

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36.

Carbon, silicon and germanium have four valence electrons each. At room temperature which one of the following statements is most appropriate?

  • The number of free conduction electrons is significant in C but small in Si and Ge

  • The number of free conduction electrons is negligibly small in all the three

  • The number of free electrons for conduction is significant in all the three

  • The number of free electrons for conduction is significant in all the three

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37.

Which of the following transitions in hydrogen atoms emit photons of highest frequency?

  • n = 2 to n = 6

  • n = 6 to n = 2

  • n = 2 to n =1

  • n = 2 to n =1

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38.

Two lenses of power -15D and +5D are in contact with each other. The focal length of the combination is

  • -20 cm

  • -10 cm

  • +20 cm

  • +20 cm

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39.

A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of

  • 1000

  • 10000

  • 10

  • 10

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40.

Young’s double slit experiment the intensity at a point where the path-difference is λ/6(λ being the wavelength of the light used) is I. If I0 denotes the maximum intensity, I/I0 is equal to

  • fraction numerator 1 over denominator square root of 2 end fraction
  • fraction numerator square root of 3 over denominator 4 end fraction
  • 1/2

  • 1/2

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