Geology Civil Services Solved Test
Earth Science Objective Question Paper
1. 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
Answer (b)
2. Boiling water
reactor uses the following as
moderator, coolant
and working fluid
(a) Ordinary fluid
(b) Heavy water
(c) Molten lead
(d) Hydrogen gas
Answer (a)
3. Fast breeder
reactors
(a) Operate at extremely high power densities
(b) Are liquid-metal cooled
(c) Produce more fuel than they constune
(d) All of the above
Answer (d)
4. Pump used in
liquid metal cooled reactor for
circulation of
liquid metal is
(a) Centrifugal
(b) Axial
(c) Reciprocation
(d) Electromagnetic
Answer (d)
5. A pressurised
water reactor employs pressuriser
(a) To maintain constant pressure in primary
circuit under varying load
(b) To supply high pressure steam
(c) To increase pressure of water in primary
circuit
(d) To provide subcooled water at high pressure
Answer (a)
6. Reactors for
propulsion applications uses
(a) Natural uranium
(b) Molten lead
(c) Thorium
(d) Plutonium
Answer (b)
7. Breeder reactors
employ liquid metal coolant
because it
(a) Acts as good moderator
(b) Produces maximum steam
(c) Transfers heat from core at a fast rate
(d) Breeds neutrons
Answer (c)
8. For economical
operation of nuclear plant
(a) Used fuel should be reprocessed
(b) Moderator should be used
(c) Coolant should be employed
(d) Control rods should be used
Answer (a)
9. When a reactor
becomes critical, then the
production of
neutrons is
(a) Infinite
(b) Zero
(c) Exactly balanced by the loss of neutrons
through leakage
(a) Initiated
Answer (c)
10. Energy
produced by a thermal reactor of same
size as breeder
reactor is
(a) Almost same
(b) Slightly more
(c) Slightly less
(d) Much less
Answer (d)
11. Superheated
steam is generated on which if
the following
reactor?
(a) Boiling water
(b) Gas cooled
(c) Pressurised water
(d) All of the above
Answer (b)
12. More appropriate
for a moderator, is one which
(a) Does not absorb neutrons
(b) Absorbs neutrons
(c) Accelerates neutrons
(d) Eats up neutrons
Answer (a)
13. In triggering
fission, which of the following
types of neutrons
are desirable?
(a) Fast moving
(b) Slow moving
(c) Critical neutrons
(d) Neutrons at rest
Answer (b)
14. Serious difficulty
in designing reactor shield
is presented by
(a) Alpha particles
(b) Beta particles
(c) Thermal neutrons
(d) Fast neutrons and gamma rays
Answer (d)
15. In order to have constant chain
reaction to
Produce a constant rate of heat output, the
value
Of ratio of the number of neutrons in one
generation
To the number of neutrons in the
immediately
Preceeding generation must be
(a) Greater
than 1.0
(b) Less
than 1.0
(c) Equal
to zero
(d) Equal
to 1.0
Answer (d)
16. Effective
moderators are those materials which
contain
(a) Kinetic energy of neutrons
(b) Kinetic energy of fission products
(d) Instantaneous release of gamma rays
(d) Gradual radioactive decay of fission Products
Answer (a)
17. In nuclear
fission
(a) The original elements change into completely
Different elements.
(b) The electrons of the elements change
(c) The molecules rearrange themselves to form
other molecules
(d) None of the above
Answer (a)
18. Which of the
following can be used as a coolant
in nuclear plant ?
(a) Light or heavy water
(b) Molten lead
(c) Thorium
(d) Plutonium
Answer (a)
19. Function of
control rods in nuclear plant is to
control
(a) Temperature
(b) Readioactive pollution
(c) Absorption of neutron
(d) Fuel consumption
Answer (c)
20. In triggering
fission, which type of neutrons
are more effective?
(a) Fast
(b) Slow
(c) In bulk
(d) Static
Answer (b)
21. 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
Answer (b)
22. Reactors
designed for propulsion applications
are designed for
(a) Natural uranium
(b) Enriched uranium
(c) Pure uranium
(d) Any type of uranium
Answer (b)
23. 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
Answer (d)
24. 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
Answer (b)
25. Breeding gain
in case of thermal breeder
reactor as
compared to fast breeder reactor is
(a) Same
(b) Lower
(c) Higher
(d) Unity
Answer (b)
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