Important Questions of Nuclei Physics | Zigya

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201.

Mutual inductance of two coils can be increased by

  • decreasing the number of turns in the coils

  • increasing the number of turns in the coils

  • winding the coils on wooden cores

  • None of these


202.

Assertion:  If a heavy nucleus is split into two medium-sized parts, each of the nuclei will have more binding energy per nucleon than the original nucleus. 

Reason:  Joining two light nuclei together to give a single nucleus of medium size means more binding energy per nucleon than the two 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.


203.

n-alpha particles per second are emitted from N atoms of a radioactive element. The half-life of the radioactive element is

  • nN s

  • Nns

  • 0.693 Nn s

  • 0.693 nN s


204.

Assertion:  The ratio for time taken for light emission from an atom to that for release of nuclear energy in fission is 1 : 100. 

Reason:  Time taken for the light emission from an atom is of the order of 10-8 s.

  • 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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205.

Assertion:  Static crashes are heard on radio, when lightning flash occurs in the sky. 

Reason:  Electromagnetic waves having frequency of radio wave range interfere with radio waves.

  • 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.


206.

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

Reason: Energy levels occur 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.


207.

In nuclear fission, which of the following quantity is conserved?

  • Energy

  • Mass

  • Momentum

  • Both energy and mass


208.

When a slow neutron is captured by a U92235 nucleus, a fission energy releasing 200 MeV. If power of nuclear reactor is 100 W then rate of nuclear fission is

  • 3.6 × 106 s-1

  • 3.1 × 1012 s-1

  • 1.8 × 104 s-1

  • 4.1 × 106 s-1


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209.

Which of the following statement is incorrect?

  • Neutron is less stable than proton

  • Neutron can cause fission in nuclear reactors but proton can not.

  • A free proton can emit beta particle.

  • A bound proton can emit beta particle.


210.

Electric field at a distance r from infinitely long conducting sheet is proportional to

  • r-1

  • r-2

  • r-3/2

  • independent of r


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