The size of an atom is of the order of one __________________?

Related Mcqs:

1. Critical energy should be _______________ the neutron binding energy of the atom in order to initiate a nuclear fission?

   A. Equal to
   B. Less than
   C. More than
   D. Either more or less

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. The ratio of volume of an atom to that of its nucleus is__________________?

   A. 1012
   B. 10-12
   C. 10-8
   D. 108

4. 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

5. 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

6. Out of the following, nucleus of _____________ atom contains the largest number of neutrons?

   A. U-235
   B. U-238
   C. U-239
   D. Pu-239

7. The atomic number of an element is equal to the number of ______________ present in its atom?

   A. Neutrons
   B. Electrons
   C. Protons
   D. Either B. or C.

8. How many atoms are present in one gm-atom of an element ?

   A. 2 × 1023
   B. 6 × 1023
   C. 6 × 1032
   D. 5 × 105

9. Heavy water used in the nuclear reactors to slow down the speed of neutrons is __________________?

   A. Highly purified water
   B. A compound of oxygen and deuterium
   C. Water having dissolved salts of heavy metals
   D. None of these

10. Hydrogen bomb employs the nuclear fusion of __________________ ?

    A. Hydrogen
    B. Deuterium
    C. Tritium
    D. Helium