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#### Nuclear Physics One Mark Questions

10th Standard EM

Reg.No. :
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Science

Time : 00:30:00 Hrs
Total Marks : 15
5 x 1 = 5
1. Gamma radiations are dangerous because

(a)

it affects eyes & bones

(b)

it affects tissues

(c)

it produces genetic disorder

(d)

it produces enormous amount of heat

2. _____________ aprons are used to protect us from gamma radiations

(a)

(b)

Iron

(c)

(d)

Aluminium

3. Proton - Proton chain reaction is an example of__________

(a)

Nuclear fission

(b)

$\alpha$ decay

(c)

Nuclear fusion

(d)

$\beta$ - decay

4. A chain reaction is continuous due to

(a)

large mass defect

(b)

large energy

(c)

production of more neutrons in fission

(d)

None of these

5. Nucleons are made of ________.

(a)

atoms

(b)

electrons and protons

(c)

electrons and neutrons

(d)

protons and neutrons

6. 5 x 1 = 5
7. Nuclear fusion is possible only at an extremely high temperature of the order of ____ K.

()

107 to 109 K

8. The radio isotope of ________ helps to increase the productivity of crops.

()

Phosphorous

9. If the radiation exposure is 100 R, it may cause ______________.

()

Iukemia

10. Indian Atomic Energy Commission is known as ________.

()

Baba Atomic Research Centre (BARC)

11. ______ is a device used to detect the level of exposure to ionizing radiation

()

Dosimeter

12. 5 x 1 = 5
13. Uncontrolled fission reaction

14. (1)

change in mass number & atomic number

15. Fertile material

16. (2)

Breeder reactor

17. Beta decay

18. (3)

Atom bomb

19. Gamma decay

20. (4)

no change in mass number & atomic number

21. Alpha decay

22. (5)

no change in mass number