GATE CY topic:radioactivity PYQs & Answers

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topic:radioactivity

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Questions 1–8 of 8. Imported answers require independent review unless marked reviewed.

Topic practice 8 questionsPage 1 of 1

The sum of the number of α-particles and β-particles emitted in the nuclear decay process, ²³⁸₉₂U → ²⁰⁶₈₂Pb, is _____ (in integer).

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An archaeological specimen containing

gives 45 counts per gram of carbon in 5 minutes. A specimen of freshly cut wood gives 20 counts per gram of carbon per minute. The counter used recorded a background count of 5 counts per minute in the absence of any

containing sample. The age of the specimen is _____ years (in integer).\n\n[Note:

= 5730 years]

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The choice(s) that correctly identify radionuclides (P, Q, R, S) shown in the following nuclear reaction is(are)

Your answerSelect all correct options. You can choose more than one.

P =

Q =

R =

S =

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Given the initial weight of 1 mg of radioactive ⁶⁰₂₇Co (half-life = 5.27 years), the amount disintegrated in 1 year (rounded off to two decimal places) is ______ mg.

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The fission reaction of

with thermal neutron is represented below.

and

are the primary fission fragment pair, which undergo series of radioactive decay to form stable nuclei

and

(chain ends). The

and

, respectively are:

Your answerChoose one option.

and

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The total number of α and β particles emitted in the following radioactive decay is ________. ²³⁸₉₂U → ²¹⁰₈₂Pb

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For the radioactive isotope ¹³¹I, the time required for 50% disintegration is 8 days. The time required for the 99.9% disintegration of 5.5 g of ¹³¹I is ________ days. (Up to one decimal place)

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undergoes

decay to

of its initial amount in 15 days. The time required for its decay to

of its initial amount is ______ days (up to two decimal places).

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GATE CY topic:radioactivity PYQs

How to practice topic:radioactivity

Question 60

Question 58

Question 33

Question 46

Question 39

Question 19

Question 20

Question 42