Tag: nuclear physics

Questions Related to nuclear physics

The reaction that take place in nuclear reactor is: 

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. Nuclear fusion

  2. Nuclear fission

  3. Controlled nuclear fission

  4. Double decomposition

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Correct Option: C
Explanation:

Controlled nuclear fission

Moderator is a substance that ..................... the neutrons in a nuclear reactor.

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. Slow down

  2. Activates

  3. Both (a) and (b) above

  4. None of the above

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Correct Option: A

The nuclear reaction that takes place in a nuclear reactor is ____________.

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. controlled fission reaction

  2. uncontrolled fission reaction

  3. nuclear fusion reaction

  4. none of the above

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Correct Option: A
Explanation:

The nuclear reaction that takes place in a nuclear reactor is controlled fission reaction.

The amount of $U^{235}$ to be fissioned, to operate a $10\ kW$ nuclear reactor is (Approximately)

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. $1.2 \times 10 ^ { - 5 }\ \mathrm { gm } / \mathrm { s }$

  2. $1.2 \times 10 ^ { - 7 }\ \mathrm { gm } / \mathrm { s }$

  3. $1.2 \times 10 ^ { - 9 }\ \mathrm { gm } / \mathrm { s }$

  4. $1.2 \times 10 ^ { - 11 }\ \mathrm { gm } / \mathrm { s }$

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Correct Option: D

The amount of $U ^ { 235 }$ in kg which is to be used per hour in a nuclear reactor of capacity $100$ ($E = 200 MeV/fission$)

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. $0.45 \times 10^{-5}$

  2. $4.5 \times 10^{-5}$

  3. $4.5 \times 10^{5}$

  4. $45 \times 10^{-5}$

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Correct Option: B

High energy netrons are used in a nuclear reactor to initiate the fission reaction.

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. True

  2. False

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Correct Option: A
Explanation:
High energy neutrons are used in nuclear reactor to initiate the fission reaction.
For eg- U-235 and U-238

Cadmium rods are used as moderators in a nuclear reactor.

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. True

  2. False

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Correct Option: B
Explanation:
Cadmium rods are used in a nuclear reactor for regulating the power level of the reactor. Cadmium rods are used in nuclear reactors to control the fission rate of radioactive material used. It is capable of absorbing many neutrons without fissioning themselves.
Heavy water, graphite etc. are used as moderator

The material that slows down the neutrons in the nuclear reactor is called

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. Reduced

  2. Compressor

  3. Moderator

  4. None of these

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Correct Option: C

An atomic power nuclear reactor can deliver $300$ MW. The energy released due to fission of each nucleus of uranium atom $U^{235} $ is $170$ MeV. The number of uranium atoms fissioned per hour will be 

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. $4\times 10^{22}$

  2. $30\times 10^{22}$

  3. $10\times 10^{20}$

  4. $5\times 10^{15}$

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Correct Option: C

The fission of one uranium nucleus releases energy of amount x joules. Find the number of fissions required to produced energy at the rate of v MW for t hours a nuclear power plant.

chemistry nuclear physics nuclear reactor the nuclear power station isotopes and nuclear chemistry

  1. $ \dfrac {yt}{x} $

  2. $ \dfrac{x}{yt} $

  3. $ 3.6 \times 10^9 \dfrac {yt}{x} $

  4. $ 3.6 \times 10^9 \dfrac {x}{yt} $

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Correct Option: A