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CTET Prep: Science Questions - Chemistry - Radioactivity
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Radioactivity is the release of energy from the decay of the nuclei of certain kinds of atoms and isotopes. Atomic nuclei consist of protons and neutrons bound together in tiny bundles at the center of atoms.

CTET Prep: Science Questions - Chemistry - Radioactivity
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20 Questions

1. One Curie of activity is equivalent to
2. Emission of b-particle from an atom
3. The fuel in atomic pile is
4. Match List-I with List-II and select the correct answer using the codes given below the lists: List-I (Characteristics) List-II (Particles)
A. Zero mass 1. Positron
B. Fractional charge 2. Neutrino
C. Fractional spin 3. Quark
D. Integral spin 4. Photon Codes A B C D
5. In which process, a nucleus spontaneously breaks down by emitting radiation?
6. Which one of the following is not radioactive?
7. Isotopes of oxygen are
8. The a-particles are
9. Hydrogen bomb is based on the principle of
10. In atomic reactors, graphite is used as
11. A radioactive substance has a halflife of four months. Three-fourth of the substance would decay in
12. Match the List-I and List-II and select the correct answer using the codes given below the lists: List-I (Nuclear reactor component) List-II (Substance used)
A. Moderator 1. Uranium
B. Control rod 2. Graphite
C. Fuel rods 3. Boron
D. Coolant 4. Sodium Codes A B C D
13. Which one of the following can be used to confirm whether drinking water contains a gamma emitting isotope or not?
14. The activity of radio-isotope change with
15. Which of the following is a radioactive element?
16. Cobalt-60 is commonly used in radiation therapy because it emits
17. Which one radiation has the highest energy?
18. Energy produced in nuclear reaction is given by
19. Natural radioactivity was discovered by
20. Match the list-I (Radio-isotope) with list-II (Medicinal use) and select the correct matching: List-I List-II
A. 60CO 1. Leucaemia
B. 131I 2. Anaemia
C. 59Fe 3. Cancerous tumours
D. 32P 4. Disorders of thyroid gland Codes A B C D

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