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 ?

Related Mcqs:

1. 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

2. 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.

3. 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

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

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

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

   A. α
   B. β
   C. γ
   D. α & β

6. 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

7. 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

8. 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

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

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

10. A moderator _____________ the neutrons?

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