CBSE Physics Nuclear Physics Test 3 Online Practice Question Answers
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CBSE Physics Nuclear Physics Test 3 Online

Test Name Atomic and Nuclear Physics Test
Subject CBSE Physics
Test Type MCQs
Total Question 25
Total Marks 50
Total Time 20 Minutes
Test Help For
  • CBSE Physics.
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Central Board for Secondary Education (CBSE) is adjustments syllabus classes subjects their official results of all classes base in Indian examinations. Learning of Science subjects include in foundation of student from the start of study. Nuclear Physics online Quiz test given with all important questions and answers related to this topic are included for general knowledge exams for improve your level to best rank in examinations, test’s.

CBSE Physics Nuclear Physics Test 3 Online


1. Half-lives of two radioactive substances A and B are respectively 20 min. Initially, the samples of A and B have equal number of nuclei. After 80 min the ratio of remaining number of A and B nuclei is ?

Question 1 of 25

2. The relationship between disintegration constant (λ) and half-life (T) will be ?

Question 2 of 25

3. The most penetrating radiation out of the following is ?

Question 3 of 25

4. The stable nucleus that has a radius half that of Fe56 is ?

Question 4 of 25

5. In nuclear fission process, energy is released because ?

Question 5 of 25

6. Alpha particles are ?

Question 6 of 25

7. A nucleus nXm emits on α and two β-particles. The resulting nucleus is ?

Question 7 of 25

8. The count rate of Geiger Muller counter for the radiation of a radioactive material of half-life 30 min decreases to 5 S-1 after 2 h. The initial count rate was ?

Question 8 of 25

9. Which of the following is positively charged ?

Question 9 of 25

10. A nucleus ruptures into two nuclear parts, which have their velocity ratio equal to 2 : 1. What will be the ratio of their nuclear size (nuclear radius) ?

Question 10 of 25

11. Half-life of a radioactive substance is 12.5 h and its mass is 256 g. After what time, the amount of remaining substance is 1g ?

Question 11 of 25

12. A free neutron decays into a proton, an electron and ?

Question 12 of 25

13. The half-life of a radioactive material is 3 h. If the initial amount is 300 g, then after 18 h, it will remain ?

Question 13 of 25

14. In compound X(n,α)→ 3Li7, the element X is ?

Question 14 of 25

15. Which of the following is used as a moderator is nuclear reactors ?

Question 15 of 25

16. Nuclear fission can be explained by ?

Question 16 of 25

17. The activity of a radioactive sample is measured as 9750 counts/min. The decay constant is approximately ?

Question 17 of 25

18. A sample of radioactive elements contains 4 x 1010 active nuclei. If half-life of element is 10 days, then the number decayed nuclei after 30 days is ?

Question 18 of 25

19. Half-life period of a radioactive substance is 6 h. After 24 h activity is 0.01 μC, what was the initial activity ?

Question 19 of 25

20. Complete the equation for the following fission process :

92U235 + 0n138Sr90 + .............. ?

Question 20 of 25

21. Atomic weight of boron is 10.81 and it has two isotopes 105B and 115B. Then, the ratio of atoms of 105B and 115B in nature would be ?

Question 21 of 25

22. In one α and β-emission ?

Question 22 of 25

23. A nuclear decay is expressed as

6C115B11 + β+ + X

Then the unknown particle X is ?

Question 23 of 25

24. In a fission reaction

23692U →117X + 117Y + n + n

the binding energy per nucleon of X and Y is 8.5 MeV whereas of 236U is 7.6 MeV. The total energy liberated will be about ?


Question 24 of 25

25. Mp and Mn are masses of proton and neutron respectively. An element of mass m has Z protons and N neutrons, then ?

Question 25 of 25


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