Practice Test: Question Set - 08
1. Uranium is recovered from its ore (pitchblende) by
- (A) Froth floatation technique
- (B) Leaching with sulphuric acid
- (C) Smelting in a furnace
- (D) Dissolving in water
2. Percentage of heavy water in ordinary water is around
- (A) 0.015
- (B) 7.54
- (C) 0.71
- (D) 32.97
3. Which of the following is not an ore of uranium?
- (A) Pitchblende
- (B) Kyanite
- (C) Carnotite
- (D) Rescolite
4. Atoms with same number of neutrons, but different number of nucleons are called
- (A) Isotones
- (B) Isobars
- (C) Isotopes
- (D) Isostere
5. "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
6. The emission of an a-particle causes the resultant nucleus to have
- (A) More atomic weight and less atomic number
- (B) Less atomic weight and less atomic number
- (C) Less atomic weight and more atomic number
- (D) None of these
7. 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
8. Neutrons have mass approximately equal to that of __________ atoms.
- (A) Hydrogen
- (B) Helium
- (C) Deuterium
- (D) None of these
9. Nuclear fuel generally used in reactors is uranium oxide instead of uranium, because the former has higher
- (A) Melting point, hence can be subjected to higher
temperature
- (B) Density; hence core volume for a given power
output would be smaller
- (C) Resistance to effects of irradiation
- (D) All (a), (b) and (c)
10. Which of the following is artificially produced as it does not occur in nature?
- (A) Uranium-235
- (B) Uranium-233
- (C) Plutonium-239
- (D) Both (b) and (c)
11. Radioactivity of an isotope is expressed in
- (A) Barn
- (B) MeV
- (C) Curie
- (D) Ergs
12. Hydrogen differs from deuterium in __________ properties.
- (A) Radioactive
- (B) Physical
- (C) Chemical
- (D) All (a), (b) and (c)
13. 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
14. 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
15. The mass number of an element is not changed, when it emits __________ radiations.
- (A) α & β
- (B) β & γ
- (C) γ & α
- (D) α, β, & γ
Next Tests: