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 Multiple Choice QuestionsMultiple Choice Questions

1.

Given the value of rydberg constant is 10 m-1, the wave number of the last line of the Balmer series in hydrogen spectrum will be:

  • 0.5 x 107 m-1

  • 0.25 x 107 m-1

  • 2.5 x10m-1

  • 2.5 x10m-1

1779 Views

2.

The ratio of escape velocity at earth (Ve) to the escape velocity at a planet (vp) whose radius and mean density are twice as that of earth is,

  • 1:2 square root of 2

  • 1:4

  • 1:square root of 2

  • 1:square root of 2

3045 Views

3.

Consider 3rd orbit of He+ (Helium), using non-relativistic approach, the speed of electron in this orbit will be (given K= 9 x 109 constant, Z=2 and h (Planck's constant = 6.6 x 10-34 Js-1

  • 2.92 x 106 m/s

  • 1.46 x 106 m/s

  • 0.73 x 106 m/s

  • 0.73 x 106 m/s

1502 Views

4.

A proton carrying 1 MeV kinetic energy is moving in a circular path of radius R in the uniform magnetic field. What should be the energy of an alpha particle to describe a circle of the same radius in the same field.

  • 2 MeV

  • 1 MeV

  • 0.5 MeV

  • 0.5 MeV

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5.

The transition from the state n = 3 to n=1 in a hydrogen-like atom results in ultraviolet radiation. Infrared radiation will be obtained in the transition from.

  • 2→ 1 

  • 3 →2

  • 4 → 2

  • 4 → 2

878 Views

6.

An electron in hydrogen atom first jumps from third excited state to second excited state and then from second excited to the first excited state. The ratio of the wavelengths λ1:λ2 emitted in the two cases is

  • 7/5

  • 27/20

  • 27/5

  • 27/5

889 Views

7.

An electron of a stationary hydrogen atom passes from the fifth energy level to ground level. The velocity that the atom acquired as a result of photon emission will be

  • fraction numerator 24 hR over denominator 25 space straight m end fraction
  • fraction numerator 25 hR over denominator 24 space straight m end fraction
  • fraction numerator 25 space straight m over denominator 24 space hR end fraction
  • fraction numerator 25 space straight m over denominator 24 space hR end fraction
1412 Views

8.

Hydrogen atom in ground state is excited by a monochromatic radiation of straight lambda space equals space 975 space straight A with straight o on top. The number of spectral lines in the resulting spectrum emitted will be,

  • 3

  • 2

  • 6

  • 6

2814 Views

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9.

The wavelength λe of an electron and λp of a photon of same energy E are related by

  • straight lambda subscript straight p proportional to space straight lambda subscript straight e superscript 2
  • straight lambda subscript straight p proportional to space straight lambda subscript straight e
  • straight lambda subscript straight p proportional to square root of space straight lambda subscript straight e end root
  • straight lambda subscript straight p proportional to square root of space straight lambda subscript straight e end root
1378 Views

10.

A certain mass of hydrogen is changed to helium the process of fusion. The mass defect in fusion reaction is 0.02866 u. The energy liberated per u is (given 1 u =931 MeV)

  • 2.67 MeV

  • 26.7 MeV

  • 6.675 MeV

  • 6.675 MeV

2120 Views

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