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

11.

This question contains Statement -1 and Statement-2. Of the four choices given after the statements,
Choose the one that best describes the two statements.
Statement – I: Energy is released when heavy nuclei undergo fission or light nuclei undergo fusion.
and
Statement – II: For heavy nuclei, binding energy per nucleon increases with increasing Z while for light nuclei it decreases with increasing Z.

  • Statement – 1is false, Statement – 2 is true.

  • Statement – 1is true, Statement – 2 is true; Statement -2 is correct explanation for Statement-1.

  • Statement – 1is true, Statement – 2 is true; Statement -2 is not a correct explanation for Statement-1.

  • Statement – 1is true, Statement – 2 is true; Statement -2 is not a correct explanation for Statement-1.

184 Views

12.

If M0 is the mass of an oxygen isotope 8O17 , Mp and MN are the masses of a proton and a neutron respectively, the nuclear binding energy of the isotope is

  • (M08MP) C2

  • (M08MP9MN) C2

  • M0C2

  • M0C2

160 Views

13.

In gamma-ray emission from a nucleus

  • both the neutron number and the proton number change

  • there is no change in the proton number and the neutron number

  • only the neutron number changes

  • only the neutron number changes

132 Views

14.

The half-life period of a radio-active element X is same as the mean life-time of another radio-active element Y. Initially, they have the same number of atoms. Then

  • X will decay faster than Y

  • Y will decay faster than X

  • X and Y have same decay rate initially

  • X and Y have same decay rate initially

114 Views

Advertisement
15.

When 3Li7 nuclei are bombarded by protons, and the resultant nuclei are 4Be8 , the emitted particles will be

  • neutrons

  • alpha particles

  • beta particles

  • beta particles

520 Views

16.

The ‘rad’ is the correct unit used to report the measurement of

  • the rate of decay of radioactive source

  • the ability of a beam of gamma ray photons to produce ions in a target

  • the energy delivered by radiation to a target.

  • the energy delivered by radiation to a target.

199 Views

17.

If the binding energy per nucleon in Li presubscript 3 presuperscript 7and He presubscript 4 presuperscript 2 nuclei are 5.60 MeV and 7.06 MeV respectively, then in the reaction

straight p space plus space Li presubscript 3 presuperscript 7 space rightwards arrow with space on top space 2 space He presubscript 2 presuperscript 4
energy of proton must be

  • 39.2 MeV

  • 28.24 MeV

  • 17.28 MeV

  • 17.28 MeV

138 Views

18.

The intensity of gamma radiation from a given source is I. On passing through 36 mm of lead, it is reduced to l/8. The thickness of lead which will reduce the intensity to l/2 will be

  • 6 mm

  • 9 mm

  • 18 mm

  • 18 mm

625 Views

Advertisement
19.

A photocell is illuminated by a small bright source placed 1 m away. When the same source of light is placed 1 /2 m away, the number of electrons emitted by photocathode would

  • decrease by a factor of 4

  • increase by a factor of 4

  • decrease by a factor of 2

  • decrease by a factor of 2

225 Views

20.

Starting with a sample of pure 66Cu, 7/8 of it decays into Zn in 15 minutes. The corresponding half-life is

  • 10 minutes

  • 15 minutes

  • 5 minutes

  • 5 minutes

452 Views

Advertisement