Related Mcqs:

1. 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

2. The half life period of a radioactive element is 100 days. After 400 days, one gm of the element will be reduced to ______________ gm?

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

3. What is the average life of a radioactive atom having a ‘half life period’ of T ?

   A. 1.44 T
   B. 0.144 T
   C. 14.4 T
   D. 2T

4. The amount of a radioisotope remaining undecayed after a time equal to four times its half life, will be _____________ percent?

   A. 3.125
   B. 6.25
   C. 12.50
   D. 25

5. 75% of a radioactive element decays in 6 hours. Its half life period is ______________ hours?

   A. 3/4
   B. 1/6
   C. 3
   D. 4

6. The half life period of a radioactive element depends on its _______________________?

   A. Temperature
   B. Pressure
   C. Amount
   D. None of these

7. If 4 gm of a radioisotope has a half life period of 10 days, the half life of 2 gm of the same isotope will be ____________ days?

   A. 5
   B. 10
   C. 20
   D. 30

8. The half life period of a radioactive element depends upon the___________________?

   A. Temperature
   B. Pressure
   C. Amount of element present
   D. None of these

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

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

10. In β-decay of radioactive material, the ratio of neutron to proton____________________?

    A. Increases
    B. Remain same
    C. Decreases
    D. Is unpredictable; may increase or decrease