MCQ

MCQ 11 Mark

The vacuum kept in between the walls of a thermos flask reduces the heat transfer by

A
conduction only
B
convection only
C
radiation only
✓
conduction and convection

Answer

Correct option: D.

conduction and convection

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MCQ 21 Mark

In the process of convection, heat travel

A
sideways
B
downwards
✓
upwards
D
in all directions

Answer

Correct option: C.

upwards

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MCQ 31 Mark

Heat in a liquid is transferred by

A
conduction
✓
convection
C
radiation
D
conduction and radiation

Answer

Correct option: B.

convection

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MCQ 41 Mark

Which of the statement is correct

A
lron rims are cooled before they are placed on cartwheels
B
A glass stopper gets tight on warming the neck of the bottle
C
Telephone wires sag in winter, but become tight in summer
✓
A little space is left between two rails on a railway track

Answer

Correct option: D.

A little space is left between two rails on a railway track

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MCQ 51 Mark

A thermometer uses

A
water
✓
mercury
C
air
D
none of the above

Answer

Correct option: B.

mercury

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MCQ 61 Mark

The temperature of pure melting ice is

✓
$0^{\circ} C$
B
$100^{\circ} C$
C
$95^{\circ} C$
D
$98.6^{\circ} F$

Answer

Correct option: A.

$0^{\circ} C$

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MCQ 71 Mark

If we add a lump of ice to a tumbler containing water,

✓
heat flows from water to ice
B
heat flows from ice to water
C
heat flows from water to ice if water is more
D
heat flows from ice to water if ice is more

Answer

Correct option: A.

heat flows from water to ice

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PHYSICS MCQ

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