Half Life MCQ Tests
12th Class Physics MCQ Tests
Half Life
of 12th Class Physics has 5 questions. If you take an online MCQ test, the system will randomly choose the questions. If you want to take the quiz by chapter then click the start test button.
Total Questions: 5
Total Marks: 5
Time: 5 Mins
Total Questions: 5
Total Marks: 5
Time: 5 Mins
5Min : 00 Sec Remaining
Question # 1
What fraction of a radioactive sample decays after two half-lives have elapsed, if No is the original number of atoms?
Question # 2
Tritium is a radioactive isotope of hydrogen with a half-life of 12 years. If a sample starts with 40 million atoms of tritium, how many atoms of tritium will be left after 12 years?
Question # 3
What is its decay constant, when its half-life is 27 minutes?
Question # 4
The count rate from a radioactive material falls from 400 counts per second to 50 counts per second in 12 minutes. What is its half-life?
Question # 5
What is the percentage of the original quantity of a radioactive material left after 5 half lives, approximately?
Total Questions
12345
Question # 1
What fraction of a radioactive sample decays after two half-lives have elapsed, if No is the original number of atoms?
Question # 2
Tritium is a radioactive isotope of hydrogen with a half-life of 12 years. If a sample starts with 40 million atoms of tritium, how many atoms of tritium will be left after 12 years?
Question # 3
What is its decay constant, when its half-life is 27 minutes?
Question # 4
The count rate from a radioactive material falls from 400 counts per second to 50 counts per second in 12 minutes. What is its half-life?
Question # 5
What is the percentage of the original quantity of a radioactive material left after 5 half lives, approximately?
Total Questions
12345
Physics
12th Class Online Classes 2026
Updated on: 17-05-2026
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