In nuclear explosion, the energy is released in the form of : fr

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 Multiple Choice QuestionsMultiple Choice Questions

351.

Which of the following arrangement is possible?

  • n l m s
    5 2 2 +1/2
  • 2 2 0 -1/2
  • 3 -2 1 +1/2
  • 0 0 1 +1/2

352.

If the mass defect of 40X is 0.090 u , then binding energy per nucleon is :

(1 u = 931.5 MeV)

  • 9.315 MeV

  • 931.5 MeV

  • 83.0 MeV

  • 8.38 MeV


353.

27Co60 is radioactive because :

  • its atomic number is high

  • it has high pn ratio

  • it has high np ratio

  • None of the above


354.

Assertion : For Balmer series of hydrogen spectrum, the value n1 = 2 and n2 = 3, 4, 5... .

Reason : The value of n2 for a line in Balmer series of hydrogen spectrum having the highest wavelength is 6.

  • If both assertion and reason are true and reason is the correct explanation of assertion.

  • If both assertion and reason are true but reason is not the correct explanation of assertion.

  • If assertion is true but reason is false.

  • If both assertion and reason are false.


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355.

In nuclear explosion, the energy is released in the form of :

  • kinetic energy

  • electrical energy

  • potential energy

  • None of these


D.

None of these

In nuclear explosion, nuclear energy is released .


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356.

The number of atoms in 52 g of He is

  • 78.299 x 1024atoms

  • 7.820 x 10-24atoms

  • 7.829 x 1024 atoms

  • 78.234 x 1025 atoms


357.

Threshold frequency of a metal is 5 × 1013 s-1 upon which 1 x 1014s-1 frequency light is focused. Then the maximum kinetic energy of emitted electron is

  • 3.3 × 10-21

  • 3.3 × 10-20

  • 6.6 × 10-23

  • 6.6 × 10-20


358.

From elementary molecular orbital theory we can deduce the electronic configuration of the singly positive nitrogen molecular ion as :

  • σ1s2σ*1s2σ2s2σ*2s2π2p4σ2p1

  • σ1s2σ*1s2σ2s2σ*2s2σ2p2π2p3

  • σ1s2σ*1s2σ2s2σ*2s2σ2p3 , π2p2

  • σ1s2σ*1s2σ2s2σ*2s2σ2p2π2p4


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359.

The valence shell electronic configuration of Cr2+ ion is :

  • 4s03d4

  • 3p64s2

  • 4s33d2

  • 4s23d0


360.

In Bohr's Orbit, nh2π indicates

  • Momentum

  • Kinetic energy

  • Potential energy

  • Angular momentum


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