06: Heat Energy Class 8 Physics : Icse-viii-physics

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ICSE-VIII-Physics

06: Heat Energy Class 8 Physics

with Solutions -

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Section : A
Objective Questions

Qstn #1
Write true or false for each statement

#1-a
Evaporation is rapid on a wet day.

Ans :
False

#1-b
Evaporation takes place only from the surface of liquid.

Ans :
True

#1-c
All molecules of a liquid take part in the process of evaporation.

Ans :
False

#1-d
Temperature of a liquid rises during boiling or vaporization

Ans :
False

#1-e
All molecules of a liquid take part in boiling.

Ans :
True

#1-f
Boiling is a rapid phenomenon.

Ans :
True

#1-g
All solids expand by the same amount when heated to the same rise in temperature.

Ans :
False

#1-h
Telephone wires are kept tight between the two poles in winter.

Ans :
True

#1-i
Equal volumes of different liquids expand by the different amount when they are heated to the same rise in temperature.

Ans :
True

#1-j
Solids expand the least and gases expand the most on being heated.

Ans :
True

#1-k
A mercury thermometer makes use of the property of expansion of liquids on heating.

Ans :
True

#1-l
Kerosene contracts on heating.

Ans :
False