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

_____________ aprons are used to protect us from gamma radiations

(a)

Lead oxide

(b)

Iron

(c)

Lead

(d)

Aluminium

Proton - Proton chain reaction is an example of__________

(a)

Nuclear fission

(b)

\(\alpha\) - decay

(c)

Nuclear fusion

(d)

\(\beta\) - decay

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

Nucleons are made of ________.

(a)

atoms

(b)

electrons and protons

(c)

electrons and neutrons

(d)

protons and neutrons

Nuclear fusion is possible only at an extremely high temperature of the order of ____ K.

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10⁷ to 10⁹ K

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

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P- 32

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

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Leukemia

Indian Atomic Energy Commission is known as ________.

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Baba Atomic Research Centre (BARC)

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

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Dosimeter

Uncontrolled fission reaction

(1)

Atom bomb

Fertile material

(2)

no change in mass number

Beta decay

(3)

Breeder reactor

Gamma decay

(4)

change in mass number & atomic number

Alpha decay

(5)

no change in mass number & atomic number