Nuclear Structure – Online MCQs – Physics 10th

1. A radioactive decay can be represented as shown. ₆C¹⁴ → ₇N¹⁴ + . . . . The emitted particle is a/an:

β-particle

α-particle

β+particle

gamma-ray

2. Isotopes above the stability line have:

few protons to be stable

few neutrons to be stable

too many neutrons to be stable

too many protons to be stable

3. Half-life of a radioactive element depends upon

amount of element present

nature of element

pressure

temperature

4. α particle is a :

carbon nucleus

hydrogen nucleus

helium nucleus

nitrogen nucleus

5. The severe health hazards caused by radioactive emissions is/are:

deep-sited burns

All of these

cancer

genetic change

6. Radioactive materials should be handled carefully. Which safety measure does not reduce the risk of using radioactive material?

Using lead screening

Keeping the material at a low temperature

Keeping the material along a distance

using the material for a short time

7. Ions are:

charged molecules

charged atoms and charged molecules

charged atoms

None of these

8. In each nuclear fission, a few neutrons are emitted. These neutrons can trigger further nuclei to undergo self-sustained fission reaction that is known as:

nuclear fusion

chemical reaction

nuclear fission

chain reaction

9. A nuclear reaction is given by:

fission

σ – decay

β-decay

fusion

10. If the radioactive source is placed inside the electric field, this radiation does not change its direction.

β⁺(positron)

β^–(electrons)

11. When atoms lose or gain electrons, they become:

compounds

ions

helium nucleus

molecules

12. A process in which two light nuclei combine to form a heavier nucleus is called:

alpha-decay

nuclear fusion

beta-decay

nuclear fission

13. The decay for these emissions increases the number of neutrons.

β^–(electrons)

β⁺(positron)

14. Various types of cancer are treated by:

iodine-131

cobalt-60

Phosphorous-32

carbon-14

15. The safest way to dispose of a large quantity of radioactive waste is:

burying it in a dry rock deep underground

washing it in the drain

draining it into the sea

burning it on a fire

16. Nuclei join the nucleons through another specific:

covalent bond

magnetic force

electrostatic force

binding energy

17. Gamma radiations are:

hydrogen nucleus

photons

electrons

helium nucleus

18. A scientist experiments using a seated source that emits β-particles. The range of the β-particles in the air is about 30cm. The precaution that is the most effective to protect the scientist from radiation is:

washing his hands before leaving the laboratory

handling the source with long tongs

keeping the temperature of the source low

opening all windows in the laboratory

19. In γ ray emission from a nucleus:

only the proton number changes

only the neutron number changes

both the neutron number and the proton number change

there is no change in the proton number and the neutron number

20. A radioactive nuclide emits a β-particle. The atomic number (proton number) of the nucleus:

decreases by 4

increases by 1

stays the same

decreases by 2

Online MCQs Test | Unit 20 : Nuclear Structure | Physics Class 10th | Sindh Board Science Group