1. The physical properties of an atom are related to
(A) nucleus
(B) electron
(C) proton
(D) neutron
2. The spontaneous emission of radiations from certain elements is called
(A) radioactivity
(B) half-life
(C) isotopes
(D) uranium-235
3. The radioactive elements are
(A) stable
(B) unstable
(C) radioactivity
(D) half-life
4. For artificial radioactivity, elements are broken down
(A) stable
(B) unstable
(C) radioactivity
(D) half-life
5. Alpha rays carry a charge
(A) positive
(B) negative
(C) neutral
(D) zero
6. Beta rays are actually fast moving
(A) nucleus
(B) electron
(C) proton
(D) neutron
7. Rays have no charge and mass as well
(A) alpha
(B) beta
(C) gamma
(D) no one
8. Rays are more powerful than X-rays
(A) alpha
(B) beta
(C) gamma
(D) no one
9. The disintegration of radioactive elements into their half quantity is called
(A) new life
(B) half-life
(C) old life
(D) lifeless
10. Fission means
(A) to break
(B) to add
(C) to waste
(D) to acquire
11. Fusion means
(A) to break
(B) to add
(C) to waste
(D) to acquire
12. One atom of uranium-235 emits ______ neutron(s) on breaking
(A) 1
(B) 2
(C) 3
(D) 4
13. The transformation of one element into another is only possible in ______ reactions
(A) Nuclear
(B) Fusion
(C) Fission
(D) Neutral
14. All isotopes are
(A) radioactive
(B) stable
(C) fusion
(D) half-life
15. The isotope of cobalt helpful to kill cancerous cells is
(A) Co59
(B) Co60
(C) Co61
(D) Co62
16. The study of genetic changes in plants and animals is done with the help of
(A) radioactive isotopes
(B) radioactivity
(C) alpha rays
(D) beta rays
17. The structure and nature of polymers can be determined with the help of
(A) radioactive isotopes
(B) radioactivity
(C) alpha rays
(D) beta rays
18. The half-life of C14 is (in years)
(A) 5577
(B) 5569
(C) 5567
(D) 5568
19. An archaeologist determined the age of Egyptian pyramids
(A) Einstein
(B) Goldsmith
(C) Curie
(D) Libby
20. Which isotope of carbon exists?
(A) 6C12
(B) 6C13
(C) 6C14
(D) 6C15