The nucleus  Xnm emits one α  part

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 Multiple Choice QuestionsMultiple Choice Questions

211.

In beta plus decay

  • antineutrino is produced with electron

  • neutrino is produced with positron

  • neutron is produced with electron

  • none of these


212.

Assertion:  Co2760  is a source of gamma radiation.

Reason: Gamma emission is due to nuclear decay.

  • 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.


213.

Half life of a radio-active element is 8 years, how much amount will be present after 32 years?

  • 14

  • 18

  • 116

  • 132


214.

Gamma decay takes place

  • Prior to alpha decay.

  • Prior to beta decay.

  • Prior to positron decay.

  • Due to de-excitment of nuclear levels.


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215.

The nucleus  Xnm emits one α  particle and 2β- particles. The resulting nucleus is

  • Yn-2m-4

  • Zn-4m-6

  • Znm-6

  • Xnm-4


D.

Xnm-4

Emission of  α-particle decreases the mass number and the atomic number by 4 and 2 respectively. Emission of [β-particle increases the atomic number by 1 while the mass number remains unchanged. After the emission of the one a-particle and two β-particles.

Decreases in mass number = 4 - 0 = 4

Decreases in atomic number = 2 - 2 =0

∴ The resulting the nucleus is  Xnm-4

i.e the isotope of the given nucleus.


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216.

Assertion:  More energy is released in fusion than fission. 

Reason:  More number of nucleons take part in fission.

  • 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.


217.

Asserion: γ-radiation emission occurs after α and β decay.

Reason: Energy levels occurs in nucleus.

  • 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.


218.

The ratio of the masses of the elements having their nuclear radii 2 fermi and 1 fermi

  • 8

  • 2

  • 3

  • 4


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219.

A proton travels few distance in an electric field, then it enters a crossed magnetic field of 1 T and radius 0.2 m, find the velocity of proton

  • 0.2 × 108 m s-1

  • 0.2 ×  107 m s-1

  • 0.2 ×  106 m s-1

  • 2 ×  107 m s-1


220.

For a nuclear reactor to run in critical condition the reproduction factor k should be

  • = 1

  • > 1

  • < 1

  • >>> 1


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