Tag: nuclear reactor

Questions Related to nuclear reactor

In a nuclear reactor the excess reactivity can be controlled by using _____________ rods.

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

  1. Lead rods

  2. Iron rods

  3. Uranium rods

  4. Cadmium rods

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Correct Option: A
Explanation:

Lead rods 

In nuclear reactor the lead rods have the ability to control the excess reactivity by suitably absorbing the neutrons and thus making the reaction controllable. 

Cadmium rods are used in a nuclear reactor

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

  1. To produce neutrons

  2. To speed up neutrons

  3. To absorb neutrons

  4. None of these

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Correct Option: C
Explanation:

To absorb neutrons 

Cadmium rods are inserted in nuclear reacter to absorb the extra nucleons any keep the nuclear reaction ratio of  1:1 , also keep the reaction stable. Cadmium has a high thermal neutron absorption cross section. Therefore cadmium rods will absorb neutrons, making them unavailable to cause fission.

The first atomic reactor was constructed by.

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

  1. Einstein

  2. Goldstein

  3. Fermi

  4. Curie

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Correct Option: C
Explanation:

Fermi 

Chicago phile -1 was the worlds first nuclear reactor. On December 1942, the first human made self sustaining nuclear chain reaction was initiated in CP -1 during an experiment led by Enrico Fermi.

In a nuclear reactor heavy water is used as a.

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

  1. Moderate

  2. Fuel

  3. Shield

  4. Controlling element

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Correct Option: A
Explanation:

Moderator 

A neutron moderator is a modium that reduces the spread of fast neutrons, thereby turning them into thermal neutrons capable of sustaining a nuclear chain reaction involving U-235. Heavy water is used as a moderator in nuclear reactor.

In nuclear power station energy of uranium is used for producing

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

  1. Electrical energy

  2. Mechanical energy

  3. Heat energy

  4. Magnetic energy

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Correct Option: A
Explanation:

A

A nuclear power plant is a facility at which energy is released by the fissioning of atoms is converted to electrical energy under strictly regulated operation conditions. 

Which one moves with greatest speed :

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

  1. $\alpha$-rays

  2. $\beta$-rays

  3. $\gamma$-rays

  4. cathode rays

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Correct Option: A
Explanation:

A

Alpha particles are released by high mass, proton rich unstable nuclei. The alpha particles is a helium nucleus, it consists of two protons and two neutrons. It contains no electron to balance the two positively charged protons. Alpha particles are therefore positively charged particles moving at high speed. 

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