A. Increases
B. Remain same
C. Decreases
D. Is unpredictable; may increase or decrease
Related Mcqs:
- Radioactive decay of a material involves a _____________ order reaction?
A. Third
B. Second
C. First
D. Zero - Number of secondary neutron emitted on fission of an atom of U-235 by slow neutron bombardment is_______________?
A. 3
B. 235
C. 200
D. 92 - Emission of β-particles during radioactive decay of a substance is from__________________?
A. Innermost shell
B. Nucleus
C. Outermost shell
D. None of these - Radioactive decay is a _____________ change?
A. Chemical
B. Nuclear
C. Physical
D. None of these - The new nucleus formed after β-decay of a radioactive element has___________________?
A. Less atomic number
B. Less atomic weight
C. More atomic number
D. More atomic weight - A radioactive isotope undergoes decay with respect to time following _____________ law?
A. Logarithmic
B. Exponential
C. Linear
D. Inverse square - Thorium-232 (a fertile material) on absorption of a neutron gets converted into ___________ , which is a fissile material?
A. Thorium-233
B. Uranium-235
C. Uranium-233
D. Plutonium-239 - The ratio of mass of a neutron to that of an electron is about 1839. What is the ratio of the mass of a proton to that of an electron?
A. 159
B. 1837
C. 2537
D. 10000 - 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 - 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
