Important Questions of Nuclei Physics | Zigya

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191.

A nucleus disintegrates into two nuclear parts which have their velocities in the ratio 2 : 1. The ratio of their nuclear size will be

  • 21/3 : 1

  • 1 : 31/2

  • 31/2 : 1

  • 1 : 21/2


192.

A block having 12g of element is placed in a room. This element is a radioactive element with half-life of 15 yr. After how many years will there be just 1.5 g of the element in the box?

  • 40 yr

  • 45 yr

  • 20 yr

  • 15 yr


193.

A7 Li target is bombarded with a proton beam current of 10-4 A for one hour to produce 7Be of activity 1.8 × 108 disintegrations per second. Assuming that one 7Be radioactive nuclei is produced by bombarding 1000 protons, its half-life is

  • 0.87 × 107 s

  • 0.2 × 107 s

  • 0.67 × 108 s

  • 0.87 × 106 s


194.

Two radioactive materials X1 and X2 have decay constants 6 and 3A respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X1 to that of X2 will be 1e  after a time

  • 16 λ

  • 13 λ

  • 36 λ

  • 69 λ


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195.

A neutron in a nuclear reactor collides head on elastically with the nucleus of a carbon atom initially at rest. The fraction of kinetic energy transferred from the neutron to the carbon atom is

  • 1112

  • 211

  • 48121

  • 48169


196.

Assertion: Thermonuclear fusion reactions may become the source of unlimited power for the mankind.

Reason: A single fusion event involving isotopes of hydrogen produces more energy from nuclear fission of  U93235

  • 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.


197.

An atom of mass number 15 and atomic number 7 captures an a-particle and then emits a proton. The mass number and atomic number of the resulting atom will be respectively

  • 14 and 12

  • 15 and 3

  • 16 and 4

  • 18 and 8


198.

A zener diode is specified as having a breakdown voltage of 9.1 V, with a maximum power dissipation of 364 mW. What is the maximum current the diode can handle?

  • 40 mA

  • 60 mA

  • 50 mA

  • 45 mA


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199.

Assertion: Generally heavy nuclei are unstable.

Reason: It has more neutrons and protons.

  • 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


200.

The half-life of radium is 1600 years. What is the fraction of sample undecayed after 6400 years?

  • 116

  • 14

  • 18

  • 124


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