Related Mcqs:

1. The atomic number of a radioactive element is not changed, when it emits _____________ rays?

   A. α
   B. β
   C. γ
   D. α & β

2. The 92U238 emits an a-particle. The product is____________________?

   A. 90U234
   B. 90U238
   C. 90U236
   D. 92U236

3. The atomic weight and atomic number of an element are A and Z respectively. What is the number of neutrons in the atom of that element ?

   A. A + Z
   B. A – Z
   C. A
   D. Z

4. 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

5. The ratio of neutrons to protons of an element having a mass number and atomic number of 80 and 40 respectively is ___________________?

   A. 1
   B. 0.5
   C. 2
   D. 4

6. The mass number of an element is equal to the number of _____________ in the nucleus?

   A. Electrons
   B. Neutrons
   C. Protons
   D. Neutrons plus protons (i.e., nucleons)

7. The atomic mass of an element is fractional, because ______________________?

   A. Of uncertainty principle
   B. It may have isobars
   C. It contains neutrons
   D. It may have isotopes

8. Which of the following radiations is the least penetrating ?

   A. α-rays
   B. β-rays
   C. γ-rays
   D. X-rays

9. 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

10. “Critical mass” is the minimum mass of nuclear fissile material required for the_______________________?

    A. Sustainment of chain reaction
    B. Power generation on commercial scale
    C. Economic power generation
    D. None of these