A. γ-rays
B. α-rays
C. Neutrons
D. None of these
Related Mcqs:
- The disintegration rate of a radioactive element _______________?
A. Progressively increases
B. Progressively decreases
C. Remains constant throughout
D. May increase or decrease depending on the material - Nuclear reactors are provided with shield to guard against the emission of mainly _____________ rays?
A. X
B. α and β
C. Neutrons & gamma
D. Infrared - Emission of β-particles during radioactive decay of a substance is from__________________?
A. Innermost shell
B. Nucleus
C. Outermost shell
D. None of these - The atomic number of a radioactive element is not changed, when it emits _____________ rays?
A. α
B. β
C. γ
D. α & β - 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 months - Which of the following may be used to measure the rate of nuclear disintegration ?
A. Geiger-Muller Counter
B. Cyclotron
C. Cold chamber
D. Mass spectrograph - 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 - Which of the following types of nuclear reactors is most prone to radioactive hazards ?
A. Pressurised water reactor
B. Gas cooled reactor
C. Molten sodium cooled reactor
D. Boiling water reactor - The amount of a radioactive material (having a half life of 100 years) remaining after 400 years will be ______________ of its original weight?
A. 1/2
B. 1/4
C. 1/8
D. 1/16 - The half life period of a radioactive element depends on its _______________________?
A. Temperature
B. Pressure
C. Amount
D. None of these
