Atoms with same number of neutrons, but different number of nucleons are called___________________?

Related Mcqs:

1. Neutrons have mass approximately equal to that of _____________ atoms?

   A. Hydrogen
   B. Helium
   C. Deuterium
   D. None of these

2. When the difference between mass number and atomic number of atoms of two or more elements are same, the atoms are termed as____________________?

   A. Isomers
   B. Isotopes
   C. Isobars
   D. Isotones

3. The number of neutrons accompanying the formation of 54Xe139 and 38Sr94 from the absorption of a slow neutron by 92U235, followed by nuclear fission is __________________?

   A. 1
   B. 2
   C. 3
   D. 4

4. Thermal neutrons which are used to cause the fission of U-235 have energy _____________ eV?

   A. < 0.025
   B. > 1
   C. 1-25
   D. > 200

5. 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

6. 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

7. A moderator _____________ the neutrons?

   A. Slows down
   B. Absorbs
   C. Accelerates
   D. Reflects

8. The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about ______________ metres/second?

   A. 1100
   B. 2200
   C. 3300
   D. 4400

9. 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

10. 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