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471.

Two men are standing at a distance of 100 M. In the middle of the distance between them the 10 M gap is vacuum. One calls another (second)
(a)Second man will listen some later
(b)Second man will listen some shorter
(c)Second man will listen never
(d)It cannot be determined
Comment
Answer is: C

472.

Low temperatures find application in
(a)Space travel, surgery and magnetic leviation
(b)Surgery, magnetic leviation and telemetry
(c)Space travel, surgery and telemetry
(d)Space travel, magnetic leviation and telemetry
Comment
Answer is: A

473.

The temperature of body is an indicator of
(a)The total energy of molecules of the body
(b)The average energy of the molecules of the body
(c)The total velocity of molecules of the body
(d)The average kinetic energy of the molecules of the body
Comment
Answer is: D

474.

At normal temperature due to puncture, the compressed air inside the tube of a car wheel suddenly start coming out. Then the air inside the tube
(a)Starts becoming hoter
(b)Starts becoming cooler
(c)Remains at the same temperature
(d)May become hotter or cooler depending on the amount of water vapour present in the air
Comment
Answer is: C

475.

Water is used in hot water bags because
(a)It is easily obtained
(b)It is cheaper and is not harmful
(c)It has high specific heat
(d)It is easy to heat water
Comment
Answer is: C

476.

Two bodies A and B are of same mass and same amount of heat is given to both of them.
If the temperature of A increases more than that of B because of heat addition, then
(a)The specific heat capacity of A is more than that of B
(b)The specific heat capacitybof A is less than that of B
(c)Both A and B have the same specific heat capacity but A has greater thermal conductivity
(d)Both A and B the same specific heat capacity but B has greater thermal conductivity
Comment
Answer is: B

477.

A Gas thermometer is more sensitive than a Liquid Thermometer because a gas
(a)Is lighter than liquid
(b)Expands more than a liquid
(c)Is easy of obtain
(d)Does not change state easily
Comment
Answer is: B

478.

The unit of Temperature adopted by the SI is the Celsius and Kelvin scales. it is based on the
(a)Melting point of ice
(b)Boiling point of water
(c)Triple point of water corresponding to - 0.01
(d)Temperature at which solid, liquid and gaseous water are all in equilibrium i.e., - 273
Comment
Answer is: C

479.

A real gas can be liquefied by the application of pressure when its temperature is
(a)Above the room temperature
(b)Above the inversion temperature
(c)At the Boyle temperature
(d)At the critical temperature
Comment
Answer is: D

480.

In the winter season if we touch to blocks one of iron and another of wood in the early morning then the block of Iron appears to be more cold because
(a)The temperature of iron block is less than that of the wooden block
(b)Iron is a bad conductor of heat in comparison of wood
(c)Wood is a bad conductor of heat in comparison of iron
(d)The block of iron is heavier than the wooden block
Comment
Answer is: A

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