Physics-Objective Related Question Answers
651. Chain reaction is allowed to proceed slowly and in a controlled manner in?
Nuclear reactor
652. Fuels used in nuclear reactors are?
Uranium 233; Uranium 235; Plutonium 239
653. The device used to slow down the fast moving secondary neutrons?
Moderator
654. Commonly used moderators are?
Heavy water; Graphite; Rods of Boron and Cadmium; Berillium oxide
655. The substances used to remove the heat produced from the nuclear reactor?
Coolants
656. Coolant used in high temperature breeder reactor?
Liquid Sodium
657. The fuel used in the fast breeder reactors?
Plutonium; Uranium oxide Power reactors Converts nuclear fission energy into electric power
658. Early reactors were known as?
Atomic piles
659. Atomic clock (ceasium) was discovered by?
Louis Essen
660. The total normal force exerted by a fluid on a surface is called?
Thrust
661. The total gravitational force act on a body?
Weight {W=mg [m·= mass of the body; g = acceleration due to gravity]}
662. Weight of a body is Minimum at?
the Equator
663. Weight of a body is Zero at?
The centre of Earth
664. Weight of a body is maximum at?
The poles of the Earth
665. Weight of a body in moon is equal to?
1/6th of the weight of a body on earth
666. The amount of matter contained in a body is called?
Mass
667. Density of water is?
1000 kg/m3
668. Density of water is maximum at?
4°C
669. Relative density is also known as?
Specific gravity
670. Water occupies maximum volume at?
- 0°C
671. When ice melts level of water….?
remains Constant
672. When ice melts, its volume…..?
Decreases
673. Why Ice floats on water?
Density of Ice is less than the density of water
674. Why a ship of iron and steel float on water?
Density of iron is less than the density of water
675. Why Iron nail sinks in water?
Density of iron is less than the density of water
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