Tag: chemistry

Questions Related to chemistry

In a nuclear reactor, moderators slow down the neutrons which come out in a fission process.The moderators used have light nuclei. Heavy nuclei will not solve the purpose, because

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

  1. The net weight of the reactor would be unbearably high.

  2. Heavy nuclei will break generating unwanted smaller nuclei.

  3. Elastic collision of neutrons with heavy nuclei will not slow them down.

  4. Substances with heavy nuclei do not occur in liquid or gaseous state at room temperature.

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Correct Option: C

The process by which the percentage of U-235'  in U-238 is increased, is called

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

  1. fission

  2. fusion

  3. chain reaction

  4. enrichment

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Correct Option: D
Explanation:

The process by which the percentage of U-235 in U-238 is increased is called enrichment.

Heavy water is used in nuclear reactor as _________.

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

  1. Coolant

  2. Moderator

  3. Both coolant and moderator

  4. Catalyst

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Correct Option: C
Explanation:

Both coolant and moderator.

Heary water ( $D _20$ )  also called deuterium oxide, water composed of deuterium, the hydrogen isotope with a mass double that of ordinary hydrogen and oxygen. The heary water is used as a moderator of neutrons and also as a coolent in nuclear power plants.

How many nuclear power plants does India have in 2018?

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

  1. 2

  2. 3

  3. 7

  4. None of these

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Correct Option: C
Explanation:
India has 7 nuclear power plants

India has 22 nuclear reactors in the operation in 7 nuclear power plants, having a total installed capacity of 6780 MW.
List of nuclear power plants
1. Tarapura
operator- NPCIL
Location- Maharashtra
2. Rawatbhata
operator- NPCIL
Location- Rajasthan
3.Kundankulam
operator- NPCIL
Location- Tamil Nadu
4. Kaiga 
operator- NPCIL
Location- Karnataka
5. Kakrapur
operator- NPCIL
Location- Gujrat
6. Kalpakkan
operator- NPCL
Location- Tamil Nadu
7. Narora
operation- NPCIL
Location- Uttar Pradesh

The term $BWR$ stands for

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

  1. Bureau of Workers Rights

  2. Boiling Water Reactor

  3. Bilateral Water Reactor

  4. Bureau of Waste Research

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Correct Option: B
Explanation:

BWR stands for Boiling Water Reactor.

Most of the highly radioactive 'spent' fuel at nucleus power plant are ___________.

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

  1. shipped abroad

  2. stored in specially designed containers

  3. buried underground

  4. reprocessed for other uses

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Correct Option: C
Explanation:

Highly radioactive spent fuel at nuclear power plant are buried underground for sake of safety.

What is the importance of moderator in a nuclear reactor?

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

  1. Moderator controls the flow of water inlet.

  2. Controls the nuclear fission by absorbing the excess neutrons.

  3. Controls the nuclear fission by slowing down the neutrons.

  4. None of these

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Correct Option: C
Explanation:

Controls the nuclear fission by slowing down the neutrons.


A moderator is a material used on a nuclear reactor to slow down the neutrons produced from fission. By slowing down neutrons the probability of a neutron interacting with Uranium-235 nuclei is greatly increased thereby maintaining the chain reaction. Carbon in the form of graphite is commonly used as a moderator.

Which is the material responsible for controlling the chain reaction in nuclear reactor?

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

  1. Boron

  2. Zirconium

  3. Beryllium

  4. Lead

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Correct Option: C
Explanation:

Beryllium

Beryllium is considered to be a basically an excellent material fir moderators and reflectors in nuclear reaction, because of its nuclear properties and many of its other physical and mechanical properties.

In a nuclear reactor, it is desirable to use reactor core in the form of ____________.

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

  1. cubical or cylindrical

  2. cubical or spherical

  3. cylindrical or spherical

  4. spherical

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Correct Option: C
Explanation:

In a nuclear reactor core from a physical standpoint, the best reactor core shape is a sphere, but design considerations often dictate a cylindrical shape.

The nuclear reaction that takes place in a nuclear reactor is a/an ________ .

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:

Controlled fission reaction takes place in nuclear reactor.