Tag: the nuclear power station

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

A nuclear reactor must consist of which of the following parts?
I. Electric generator
II. Fissionable fuel elements
III. Moderator

  1. I only

  2. III only

  3. I and II only

  4. II and III only

  5. I, II and III
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

A nuclear reactor must consist:
 II. Fissionable fuel elements such as U-235 and Pu-239.
III. Moderator (heavy water) which slows down the speed of neutrons.

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

Boron rods, in a nuclear reactor, are used as.

  1. moderator

  2. Protective shield

  3. Coolants

  4. Control rods
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Control rods are used in nuclear reactors to control the fission rate of uranium and plutonium. It is achieved by removing the excess neutrons from the reactor core. The only way to remove the excess neutrons through some elements which posses strong neutron absorption capacity. One such element is boron. By regulating the movement or insertion of boron rods into the reactor core while fission process is in progress, the excess neutrons produced during the chain reaction are absorbed by boron which rods regulate the availability of neutron. 


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

A disadvantage of nuclear power is - 

  1. it produces carbon dioxide which is responsible for global warming

  2. it produces toxic waste

  3. it affects the ozone layer

  4. it requires large amounts of fuel to produce a small amount of energy
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Nuclear fuels are non-renewable sources of energy and large amount of radioactive materials, which are toxic in nature, are released in the environment which are extremely hazardous to the health of living being for thousands of years.

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

Cadmium rods are used as moderators in a nuclear reactor.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Commonly used moderators include regular(light) water (roughly 75% of the world's reactors), solid graphite (20% of reactors) and heavy water (5% of reactors). Beryllium has also been used in some experimental types, and hydrocarbons have been suggested as another possibility.

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

In a nuclear power plant, uranium atoms

  1. combine and give off heat energy

  2. split and give off heat energy

  3. burn and give off heat energy

  4. split and give off electrons
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

A nuclear reactor produces and controls the release of energy from splitting the atoms of Uranium. Nuclear plants do not burn anything to create steam. Instead they split uranium atoms in a process of fission

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

Boron rods are used in nuclear reactor as

  1. moderator

  2. control rods

  3. coolant

  4. protective shield
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Control rods are used in nuclear reactors to control the fission rate of uranium an plutonium. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning
The wide absorption spectrum of boron makes it suitable as neutron shield