Radioactive decay of a material involves a _____________ order reaction?
Radioactive decay of a material involves a _____________ order reaction?
A. Third
B. Second
C. First
D. Zero
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A radioactive isotope undergoes decay with respect to time following _____________ law?
A radioactive isotope undergoes decay with respect to time following _____________ law?A. Logarithmic
B. Exponential
C. Linear
D. Inverse squareWhich of the following nuclear materials is fissile ?
Which of the following nuclear materials is fissile ?A. Uranium-238
B. Thorium-232
C. Plutonium-239
D. None of theseWhich 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 raysOrdinary water is not used as a moderator because, it___________________?
Ordinary water is not used as a moderator because, it___________________?A. Has a low absorption cross-section
B. Has a low scattering cross-section
C. Absorbs neutrons
D. Does not absorb neutronsIn a pressurised water reactor (PWR), the___________________?
In a pressurised water reactor (PWR), the___________________?A. Fuel is natural uranium and heavy water acts both as moderator & coolant
B. Coolant water boils in the core of the reactor
C. Coolant water is pressurised to prevent bulk boiling of water in the core
D. Use of moderator is not requiredIn β-decay of radioactive material, the ratio of neutron to proton____________________?
In β-decay of radioactive material, the ratio of neutron to proton____________________?A. Increases
B. Remain same
C. Decreases
D. Is unpredictable; may increase or decrease