Tag: nuclear physics

Quizzes (6) Questions (198)

Questions Related to nuclear physics

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

Heavy water is:

  1. compound of deutrium and oxygen
  2. water at $4 ^\circ C$

  3. water, in which soap does not lather

  4. compound of heavy oxygen and heavy hydrogen
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Heavy water is water that contains heavy hydrogen or deuterium. Deuterium differs from the hydrogen usually found in water, protium, in that each atom of deuterium contains a proton and a neutron. Heavy water may be deuterium oxide,$D _2O$ or it may be deuterium protium oxide, $DHO$. Heavy water occurs naturally, although it is much less common than regular water. 

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

Nuclear power stations are usually located near source of water because.

  1. Fuel could be transported to the station by ships

  2. Chemical wastes are discharged into the river

  3. Water is used as coolant and moderator

  4. Water is used to rotate the turbines of the generator
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Water can be used as coolant and moderator

Nuclear power stations are usually located near water source because water is used as coolant and moderator. 

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

The control rod in a nuclear reactor is made of.

  1. Cadmium

  2. Uranium

  3. Graphite

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

Control rods are used in nuclear reactors to control the fision rate of uranium and plutonium. They are composed of chemical elements such as boron, silver, indium and cadmium that are capable of absorbing many neutrons without themselves fissioning.

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

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

  1. Lead rods

  2. Iron rods

  3. Uranium rods

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

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

Cadmium rods are used in a nuclear reactor

  1. To produce neutrons

  2. To speed up neutrons

  3. To absorb neutrons

  4. None of these
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

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

In a nuclear reactor heavy water is used as a.

  1. Moderate

  2. Fuel

  3. Shield

  4. Controlling element
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

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

Which one moves with greatest speed :

  1. $\alpha$-rays
  2. $\beta$-rays
  3. $\gamma$-rays

  4. cathode rays
Reveal answer Fill a bubble to check yourself
A Correct answer
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.