ICS Part 2 Physics Chapter 21 Short Questions Preparation


12th Class Physics
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Physics - ICS Part 2 Physics Chapter 21 Short Questions Preparation

Question # 1

What are thermal reactors?

  • Ans 1: The thermal reactors are called thermal reactors because the neutrons must be slowed down to thermal energies to produce further fission,They use natural uranium or slightly enriched uranium as fuel.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 1

Question # 1

What are thermal reactors?

  • Ans 1: The thermal reactors are called thermal reactors because the neutrons must be slowed down to thermal energies to produce further fission,They use natural uranium or slightly enriched uranium as fuel.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 2

Question # 1

What is half line?

  • Ans 1: The half line T1/2of a radioactive elements is that period in which half of the atoms decay.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 3

Question # 1

Briefly give the use of (a)Wilson cloud chamber (b)G.M counter.

  • Ans 1: Wilson Cloud Chamber:It provides information about the change in mass and energy of radiating particles.
    G.M Counter:It is used to determine the range and penetrating power of ionizing particles.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 4

Question # 1

Define absorbed dose and Gray.

  • Ans 1: Absorbed dose:It is defined as the amount of energy absorbed from an ionizing radiation per unit mass of the absorbing body i.e.
    Absorbed dose=energy/mass
    Gray: it is defined as the amount of energy equal to one joule absorbed by a body of mass 1kg i.e
    gray=1 joule/1 kg
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ICS Part 2 Physics Chapter 21 Short Questions Preparation - Set 5

Question # 1

What do you understand by "background radiation "?State two source of this radiation?

  • Ans 1: When no radioactive source is placed near the radiation detector,it records radiation,These radiations are called background radiations..
    Its source are
    1. Cosmic rays
    2. presence of radioactive substance Earth crust and atmosphere.
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ICS Part 2 Physics Chapter 21 Short Questions Preparation