Online Chemical Engineering Test - Nuclear Power Engineering Test

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Total number of questions: 20.
Time allotted: 30 minutes.
Each question carries 1 mark; there are no negative marks.
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Moderating material used in a thermal-reactor should be a

good absorber of neutrons.

solid substance.

poor absorber of neutrons.

none of these.

[#]

'Light water' used as a coolant in nuclear reactor is nothing but

ordinary water.

mildly acidic (pH = 6) water.

mildly alkaline (pH = 8) water.

none of these.

[#]

Uranium is recovered from its ore (pitchblende) by

froth floatation technique.

leaching with sulphuric acid.

smelting in a furnace.

dissolving in water.

[#]

Which is not a fissile nuclear material ?

U-233

U-235

U-238

Pu-239

[#]

Heavy water plant is not located at

Kota and Baroda

Talcher (Orissa)

Tuticorin(Tamilnadu)

Korba

[#]

Artificially produced radioactive isotopes are used for

power generation.

treatment of certain diseases.

initiating nuclear fission and fusion.

all (a), (b) and (c).

[#]

Heavy water has maximum density at __________ °C.

11.6

18.6

[#]

Uranium percentage in monazite sand is about

0.01

0.25

1.2

[#]

Thorium-232 (a fertile material) on absorption of a neutron gets converted into __________ , which is a fissile material.

thorium-233

uranium-235

uranium-233

plutonium-239

[#]

10.

Mass of a positron is same as that of a/an

electron

α-particle

proton

neutron

[#]

11.

Candu reactor is a __________ nuclcear reactor.

natural uranium fuelled heavy water cooled & moderated

highly enriched uranium (85% U-235) fuelled

homogeneous

fast breeder

[#]

12.

H₂ is a better coolant than CO₂, due to its relatively

lower density.

higher specific heat.

non-reactivity to uranium.

lower neutron capture cross-section.

[#]

13.

Percentage of natural uranium present in uranium ore found in Jadugoda (Jharkhand) is

0.1

[#]

14.

First experimental observation of nuclear fission was done by

Plane

Rutherford

Fermi

Hahn and Strassman

[#]

15.

Thorium can be converted into U-233 in a __________ reactor.

liquid metal cooled

fast breeder

thermal

swimming pool

[#]

16.

Pick out the wrong statement.

The nucleus of a hydrogen atom is identical with a proton.

A, β-ray particle is identical with an electron.

Mass of an electron is about 1/1800th of the lightest nucleus.

Positron is heavier than a proton.

[#]

17.

Radioactive decay is a __________ change.

chemical

nuclear

physical

none of these

[#]

18.

The time required for half of the __________ of a radioactive isotope to decay is called its half life.

nuclei

electrons

protons

neutrons

[#]

19.

A fast breeder reactor employs

graphite as moderator.

water as coolant.

molten sodium as coolant as well as moderator.

U-235 as fuel.

[#]

20.

The velocity of thermal (slow) neutrons triggering nuclear fission reaction (having energy equal to 0.025 eV) is about __________ metres/second.

1100

2200

3300

4400

[#]

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