#### Nuclear Physics Book Back Questions

10th Standard

Reg.No. :
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Science

Time : 00:45:00 Hrs
Total Marks : 30
3 x 1 = 3
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. In the nuclear reaction 6X12 $\overset { \alpha decay }{ \longrightarrow }$ zYA the value of A & Z.

(a)

8, 6

(b)

8, 4

(c)

4, 8

(d)

cannot be determined with the given data

4. 2 x 1 = 2
5. The radio isotope of ________ helps to increase the productivity of crops.

()

Phosphorous

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

()

Iukemia

7. 2 x 2 = 4
8. Assertion: A neutron impinging on U235, splits it to produce Barium and Krypton.
Reason: U - 235 is a fissile material.
Codes:
(a) If both the assertion and the reason are true and the reason is the correct explanation of the assertion.
(b) If both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.
(c) If the assertion is true, but the reason is false.
(d) If the assertion is false, but the reason is true.

9. Assertion: Control rods are known as 'neutron seeking rods'
Reason: Control rods are used to perform sustained nuclear fission reaction.
Codes:
(a) If both the assertion and the reason are true and the reason is the correct explanation of the assertion.
(b) If both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.
(c) If the assertion is true, but the reason is false.
(d) If the assertion is false, but the reason is true.

10. 2 x 2 = 4
11. Spontaneous process :
Natural Radioactivity, Induced process : ________

()

12. Deflected by electric field :
α ray, Null Deflection : __________

()

y- ray

13. 1 x 2 = 2
14. Which material protects us from radiation?

15. 2 x 4 = 8
16. Mr. Ramu is working as an X - ray technician in a hospital. But, he does not wear the lead aprons. What suggestion will you give to Mr. Ramu?

17. Give any two uses of radio isotopes in the field of agriculture?

18. 1 x 7 = 7
19. A radon specimen emits radiation of 3.7 × 103 GBq per second. Convert this disintegration in terms of curie. (one curie = 3.7 × 1010 disintegration per second).