The thermonuclear reaction of hydrogen inside the stars is taking

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.
Advertisement

 Multiple Choice QuestionsMultiple Choice Questions

91.

The phenomena in which proton flips is

  • nuclear magnetic resonance

  • lasers

  • radioactivity

  • nuclear fusion


92.

Assume the graph of specific binding energy versus mass number is as shown in the figure. Using this graph, select the correct choice from the following.

              

  • Fusion of two nuclei of mass number lying in the range of 100 < A < 200 will release energy

  • Fusion of two nuclei of mass number lying in the range of 51 < A < 100 will release energy

  • Fusion of two nuclei of mass number lying in the range of 1 < A < 50 will release energy

  • Fission of the nucleus of mass number lying in the range of 100 < A < 200 will release energy when broken into two fragments


93.

Pick out the correct statement from the following.

  • Energy released per unit mass of the reactant is less in case of fusion reaction

  • Packing fraction may be positive or may be negative

  • Pu239 is not suitable for a fission reaction

  • For stable nucleus, the specific binding energy is low


94.

A radioactive sample S1 having the activity A1 has twice the number of nuclei as another sample S2 of activity A2. If A1 = 2A1, then the ratio of half-life of S2 to the half-life of S2 is

  • 4

  • 2

  • 0.25

  • 0.75


Advertisement
95.

When a neutron is disintegrated to give a β-particle,

  • a neutrino alone is emitted

  • a proton and neutrino are emitted

  • a proton alone is emitted

  • a proton and an antineutrino are emitted


Advertisement

96.

The thermonuclear reaction of hydrogen inside the stars is taking place by a cycle of operations. The particular element which acts as a catalyst is

  • Nitrogen

  • Oxygen

  • Helium

  • Carbon


D.

Carbon

In carbon cycle, carbon is a reactant and as well as an end product.


Advertisement
97.

The fraction of the initial number of radioactive nuclei which remain undecayed after half of a half-life of the radioactive sample is

  • 14

  • 122

  • 12

  • 12


98.

1 curie represents

  • 3.7 × 107 disintegrations per second

  • 3.7 × 1010 disintegrations per second

  • 106 disintegrations per second

  • 1 disintegrations per second


Advertisement
99.

Decay constants of two radio-active samples A and B are 15x and 3x respectively. They have equal number of initial nuclei. The ratio of the number of nuclei left in A and B after a time 16x is

  • e-2

  • e

  • e2

  • e-1


100.

Mass number of the elements A, B, C and D are 30, 60, 90 and 120 respectively. The specific binding energy of them are 5 MeV, 8.5 MeV, 8 MeV and 7 MeV respectively. Then, in which of the following reaction/s energy is released ?

1.  D → 2B

2.  C → B + A

3.  B → 2A

  • in (1), (2) and (3)

  • Only in (1)

  • in (2), (3)

  • in (1), (3)


Advertisement