Home
Current Affairs January 2024

What is the correct answer?

4

The mass number of a substance represents the sum of total number of

A. Protons and neutrons in an atom

B. Protons and electrons in an atom

C. Neutrons and electrons in an atom

D. Protons and neutrons in a nucleus

Correct Answer :

D. Protons and neutrons in a nucleus


Related Questions

What is the correct answer?

4

In a fission process, maximum percentage of energy is released as

A. Kinetic energy of neutrons

B. Kinetic energy of fission products

C. Instantaneous release of gamma rays

D. Gradual radioactive decay of fission products

What is the correct answer?

4

Which of the following can be used as a coolant in nuclear plant?

A. Light or heavy water

B. Molten lead

C. Carbon dioxide

D. Freon

What is the correct answer?

4

Each fission of U₂₃₅ produces on the average _________ fast neutrons as a product of reaction.

A. 2.46

B. 24.6

C. 246

D. 2460

What is the correct answer?

4

Amongst the following, the fissionable materials are

A. U₂₃₃ and Pu₂₂₉

B. U₂₃₁ and Pu₂₃₃

C. U₂₃₅ and Pu₂₃₅

D. U₂₃₈ and Pu₂₃₉

What is the correct answer?

4

The efficiency of a nuclear power plant in comparison to conventional and nuclear consideration is

A. Higher cost of nuclear fuel

B. High initial cost

C. High heat rejection in condenser

D. Lower temperature and pressure conditions

What is the correct answer?

4

Effective moderators are those materials which contain

A. Light weight atoms

B. Heavy weight atoms

C. Critical atoms

D. Zero weight atoms

What is the correct answer?

4

Pick up the wrong statement

A. In a heterogeneous or solid fuel reactor, the fuel is mixed in a regular pattern within moderator.

B. Slow or thermal neutrons have energy of the order or 0.025 eV

C. Fast neutrons have energies above 1000 eV

D. Fast reactor uses moderator

What is the correct answer?

4

Solid fuel for nuclear reactions may be fabricated into various small shapes such as

A. Plates

B. Pallets

C. Pins

D. Any one of the above

What is the correct answer?

4

Half life of a radioactive isotope corresponds to the time required for half of the following to decay

A. Electrons

B. Protons

C. Neutrons

D. Atom

What is the correct answer?

4

In the breeder reactors the generation of new fissionable atom is

A. At the lower rate than the consumption

B. At a higher rate than the consumption

C. At an equal rate of the consumption

D. Depends on other considerations

What is the correct answer?

4

The energy produced by a thermal reactor of same size as a breeder reactor is

A. Almost same

B. Slightly more

C. Slightly less

D. Much less

What is the correct answer?

4

Electron volt is the unit of

A. Atomic power

B. Energy

C. Voltage

D. Radio activity

What is the correct answer?

4

In a thermal power plant, coal from the coal handling plant is moved to the boiler bunker through a

A. Belt conveyor

B. Bucket conveyor

C. Fork lift truck

D. Overhead crane

What is the correct answer?

4

The total energy released in fission of U is

A. 5 MeV

B. 10 MeV

C. 199 MeV

D. 168 MeV

What is the correct answer?

4

The material most commonly used for shielding is

A. Carbon

B. Lead

C. Concrete

D. All of these

What is the correct answer?

4

The fuel needed, with reflector in nuclear power plant, in order to generate sufficient neutrons to sustain a chain reaction, would be

A. More

B. Less

C. Same

D. Zero

What is the correct answer?

4

A nuclear fission is initiated when the critical energy as compared to neutron binding energy of the atoms is

A. Same

B. More

C. Less

D. There is no such criterion

What is the correct answer?

4

The function of control rods in nuclear plants is to

A. Control temperature

B. Control radioactive pollution

C. Control absorption of neutron

D. Control fuel consumption

What is the correct answer?

4

Which of the following type of pump is used in liquid metal cooled reactor for circulation of liquid metal

A. Centrifugal

B. Axial

C. Reciprocation

D. Electromagnetic

What is the correct answer?

4

In nuclear fission each neutron that causes fission releases

A. No new neutron

B. At least one new neutron

C. One new neutron

D. More than one new neutron

What is the correct answer?

4

Boiling water reactor uses the following as moderator, coolant and working fluid

A. Ordinary fluid

B. Heavy water

C. Molten lead

D. Hydrogen gas

What is the correct answer?

4

In triggering fission, the following types of neutrons are desirable

A. Fast moving

B. Slow moving

C. Critical neutrons

D. Neutrons at rest

What is the correct answer?

4

Enriched uranium is one in which

A. Percentage of U₂₃₅ has been artificially increased

B. Percentage of U has been artificially increased

C. Percentage of U₂₃₄ has been artificially increased

D. Extra energy is pumped from outside

What is the correct answer?

4

Which of the following particles is the lightest?

A. Nucleus

B. Electron

C. Proton

D. Meson

What is the correct answer?

4

Which of the following is the primary fuel?

A. U₂₃₃

B. U

C. U₂₃₈

D. Pu

What is the correct answer?

4

Enriched uranium may contain fissionable contents of the order of

A. 1-99 %

B. 1-25 %

C. 1-50 %

D. 1-75 %

What is the correct answer?

4

Fast breeder reactor uses

A. Boiler

B. Direct cycle of coolant system

C. Double circuit system of coolant cycle

D. Multi passes system

What is the correct answer?

4

A boiling water reactor uses following as fuel

A. Enriched uranium

B. Plutonium

C. Thorium

D. U

What is the correct answer?

4

One gram of uranium will produce energy equivalent to approximately

A. 1 tonne of high grade coal

B. 4.5 tonnes of high grade coal

C. 10 tonnes of high grade coal

D. 100 tonnes of high grade coal

What is the correct answer?

4

The secondary fuel used in nuclear power plants is

A. U₂₃₃ and Pu₂₃₉

B. U₂₃₅ and Th₂₃₂

C. U₂₃₅ and Pu₂₃₈

D. U₂₃₃ and Pu₂₃₈