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Class 12 Physics - Chapter 13: Nuclei MCQ Questions

9 Questions 18 Minutes
Answered: 0 / 9Unanswered: 9

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Question 1

Half-lives of two radioactive elements A and B are 20 minutes and 40 minutes, respectively. Initially, the samples have equal number of nuclei. After 80 minutes, the ratio of decayed numbers of A and B nuclei will be:

Question 2

Fusion reaction takes place, at high temperature because:

Question 3

A nuclear explosive is designed to deliver 1 MW power in the form of heat energy. If the explosion is designed with nuclear fuel consisting of U235 to run a reactor at this power level for one year, then the amount of fuel needed is (given energy per fission is 200 MeV)

Question 4

When the radioactive isotope 88Ra226 decays in a series by emission of three alpha (α) and a beta (ß) particle, the isotope X which remains undecayed is

Question 5

When a nucleus in an atom undergoes a radioactive decay, the electronic energy levels of the atom

Question 6

A radioactive isotope has a half-life of T years. The time it takes its activity to reduce to 3.125% is

Question 7

A radioactive nucleus A with a half-life T decays into a nucleus B. At t = 0, there is no nucleus B. At some time, t the ratio of the number of B to that of A is 0.3. Then, t is given by:

Question 8

Radioactive material ‘A’ has decay constant ‘8 λ’ and material ‘B’ has decay constant ‘λ’. Initially they have same number of nuclei. After what time, the ratio of number of nuclei of material ‘B’ to that ‘A’ will be 1/e?

Question 9

For a radioactive material, half-life is 10 minutes. If initially there are 600 number of nuclei, the time taken (in minutes) for the disintegration of 450 nuclei is:

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