1000+ Physics Questions and Answers Pdf - 2

Question: 6

What is a moderator?

The moderator is a material which is used to slow down the neutrons produced by nuclear fission.

Question: 7

Give the medical applications of X-rays?

Radio graphy : X-ray photographs are used to detect fracture and dislocation of bones. They are used to locate the foreign body in digestive track or lungs and bullet embedded in a limb.

Radio Therapy : They are used to destroy the malignant tumors and cure some skin disease.

Question: 8

Name the materials that are used as moderators?

Graphite, Heavy water, Berillium and its oxides are used as moderators.

Question: 9

What is the principle of atom bomb?

If the number produced in a nuclear fission is not controlled a large amount of energy is released in a violet explosion. The uncontrolled chain reaction is the basic principle of atom bomb.

Question: 10

Define the unit of radiation exposure?

The unit of radiation exposure is roentgen. One Roentgen is a quantity of radiation which produces 1.61x10¹⁵ ion pairs in one kilogram of air.