Which of the following is the most harmful for the human being ?
Which of the following is the most harmful for the human being ?
A. β-rays
B. X-rays
C. γ-rays
D. Ultra violet rays
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The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then____________?
The half life period of a radioactive substance is best determined by counting the number of alpha particles emitted per second in a Geiger Muller counter from its known quantity. If the half life period of a radioactive substance is one month, then____________?A. 3/4th of it will disintegrate in two months
B. It will completely disintegrate in two months
C. It will completely disintegrate in four months
D. 1/8th of it will remain intact at the end of four monthsWhich of the following ores contains maximum percentage of uranium ?
Which of the following ores contains maximum percentage of uranium ?A. Carnotite
B. Thorium
C. Rescolite
D. PitchblendeAtoms of U-238 and U-235 differ in structure by three_____________________?
Atoms of U-238 and U-235 differ in structure by three_____________________?A. Electrons and three protons
B. Protons
C. Neutrons
D. ElectronsThorium-232 is converted into uranium-233 in a/an ______________ nuclear reactor?
Thorium-232 is converted into uranium-233 in a/an ______________ nuclear reactor?A. Thermal
B. Fast breeder
C. Heavy water moderated
D. Enriched uraniumGraphite is used in nuclear reactor as_____________________?
Graphite is used in nuclear reactor as_____________________?A. Insulation lining of the reactor
B. Fuel
C. Lubricant
D. Retarder of neutron velocityThe molecular weight of heavy water is_________________?
The molecular weight of heavy water is_________________?A. 10
B. 18
C. 20
D. 36