Related Mcqs:

1. Radioactive decay of a material involves a _____________ order reaction?

   A. Third
   B. Second
   C. First
   D. Zero

2. Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is_______________?

   A. 3
   B. 235
   C. 200
   D. 92

3. Emission of β-particles during radioactive decay of a substance is from__________________?

   A. Innermost shell
   B. Nucleus
   C. Outermost shell
   D. None of these

4. Radioactive decay is a _____________ change?

   A. Chemical
   B. Nuclear
   C. Physical
   D. None of these

5. The new nucleus formed after β-decay of a radioactive element has___________________?

   A. Less atomic number
   B. Less atomic weight
   C. More atomic number
   D. More atomic weight

6. A radioactive isotope undergoes decay with respect to time following _____________ law?

   A. Logarithmic
   B. Exponential
   C. Linear
   D. Inverse square

7. Thorium-232 (a fertile material) on absorption of a neutron gets converted into ___________ , which is a fissile material?

   A. Thorium-233
   B. Uranium-235
   C. Uranium-233
   D. Plutonium-239

8. The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?

   A. 159
   B. 1837
   C. 2537
   D. 10000

9. The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then____________?

   A. 3/4th of it will disintegrate in two months
   B. It will completely disintegrate in two months
   C. It will completely disintegrate in four months
   D. 1/8th of it will remain intact at the end of four months

10. The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be ______________ of its original weight?

    A. 1/2
    B. 1/4
    C. 1/8
    D. 1/16