Every Book Back multiple-choice question from Nuclear Physics (10th Standard Science, Samacheer Kalvi) — each with the correct option highlighted and a clear, worked explanation. Free to read in English and Tamil.
Q1
Man-made radioactivity is also known as _____________
- A. Induced radioactivity
- B. Spontaneous radioactivity
- C. Artificial radioactivity
- D. a & cCorrect
Explanation. Man-made radioactivity is artificially induced in lighter elements by bombarding them with projectiles, making it both induced and artificial radioactivity.
Q2
Unit of radioactivity is _____________
- A. roentgen
- B. curie
- C. becquerel
- D. all the aboveCorrect
Explanation. Radioactivity is measured in several units including the SI unit becquerel, the traditional unit curie, and roentgen for radiation exposure.
Q3
Artificial radioactivity was discovered by ____________
- A. Bequerel
- B. Irene CurieCorrect
- C. Roentgen
- D. Neils Bohr
Explanation. Artificial or induced radioactivity was discovered by Irene Curie and F. Joliot in 1934.
Q4
In which of the following, no change in mass number of the daughter nuclei takes place?
i) α decay
ii) β decay
iii) γ decay
iv) neutron decay
- A. (i) is correct
- B. (ii) and (iii) are correctCorrect
- C. (i) & (iv) are correct
- D. (ii) & (iv) are correct
Explanation. In beta decay, the mass number remains unchanged while the atomic number increases by one. In gamma decay, only the energy state changes, leaving both mass and atomic numbers constant.
Q5
____________ isotope is used for the treatment of cancer.
- A. Radio Iodine
- B. Radio CobaltCorrect
- C. Radio Carbon
- D. Radio Nickel
Explanation. Radio cobalt (Co-60) is a radioactive isotope of cobalt widely used in radiotherapy for treating cancer.
Q6
Gamma radiations are dangerous because
- A. it affects eyes & bones
- B. it affects tissues
- C. it produces genetic disorderCorrect
- D. it produces enormous amount of heat
Explanation. Gamma rays have extremely high penetrating power. They can easily penetrate human tissues and mutate genes, leading to genetic disorders.
Q7
_____________ aprons are used to protect us from gamma radiations
- A. Lead oxide
- B. Iron
- C. LeadCorrect
- D. Aluminium
Explanation. Lead has a very high density and atomic number, making lead aprons highly effective in absorbing and blocking penetrating gamma radiations.
Q8
Which of the following statements is/are correct?
i. α particles are photons
ii. Penetrating power of γ radiation is very low
iii. Ionization power is maximum for α rays
iv. Penetrating power of γ radiation is very high
- A. (i) & (ii) are correct
- B. (ii) & (iii) are correct
- C. (iv) only correct
- D. (iii) & (iv) are correctCorrect
Explanation. Alpha particles are helium nuclei with the highest ionizing power but low penetrating power, whereas gamma radiations are photons with very high penetrating power and low ionizing power.
Q9
Proton - Proton chain reaction is an example of __________________
- A. Nuclear fission
- B. α - decay
- C. Nuclear fusionCorrect
- D. β - decay
Explanation. The proton-proton chain reaction is a nuclear fusion process that combines hydrogen nuclei to form helium, releasing stellar energy in stars like the Sun.
Q10
In the nuclear reaction 6 X12 α decay Z YA, the value of A & Z.
- A. 8, 6
- B. 8, 4Correct
- C. 4, 8
- D. cannot be determined with the given data
Explanation. During alpha decay, a helium nucleus is emitted. This decreases the mass number of the parent nucleus by four and its atomic number by two.
Q11
Kamini reactor is located at __________
- A. KalpakkamCorrect
- B. Koodankulam
- C. Mumbai
- D. Rajasthan
Explanation. Kamini, which stands for Kalpakkam Mini reactor, is located at Kalpakkam in Tamil Nadu, India.
Q12
Which of the following is/are correct?
i. Chain reaction takes place in a nuclear reactor and an atomic bomb.
ii. The chain reaction in a nuclear reactor is controlled
iii. The chain reaction in a nuclear reactor is not controlled
iv. No chain reaction takes place in an atom bomb
- A. (i) only correct
- B. (i) & (ii) are correctCorrect
- C. (iv) only correct
- D. (iii) & (iv) are correct
Explanation. Chain reactions occur in both. In a nuclear reactor, the chain reaction is controlled to generate power, while in an atomic bomb, it is uncontrolled, leading to an explosion.
About these Nuclear Physics questions
These are the Book Back multiple-choice questions for Nuclear Physics from the Tamil Nadu State Board (Samacheer Kalvi) 10th Standard Science syllabus. Each question shows the correct option and an original, step-by-step explanation so you understand the method, not just the answer. Use the answer key above to jump to any question, then take the practice test to check yourself under exam-like conditions.
Frequently asked questions
How many MCQs are there in Nuclear Physics?
This chapter has 12 book-back multiple-choice questions, each with the correct answer and a step-by-step explanation.
Are these 10th Standard Science MCQs free to practise online?
Yes. Every question, answer and explanation here is free, and you can also take them as a timed practice test.
Where can I find the Nuclear Physics book-back answers?
The correct option for each question is highlighted on this page with a worked explanation, plus a quick answer-key summary at the top.
