The boiling point of a liquid is directly proportional to the atmospheric pressure.
True
False
The presence of impurities decreases the boiling point of a liquid.
True
False
When a material is heated, it expands, i.e., there is an increase in the length, area and volume of the material.
True
False
Coefficient of linear expansion is defined as the increase in length per unit original length per unit rise in temperature.
True
False
If two plates of different areas of a same metal are taken, then the plate with larger area will expand less on heating as compared to the plate with smaller area.
True
False
Aluminium is seen to expand thrice as much as steel.
True
False
Bimetallic strips are used to control temperature.
True
False
Click the correct answer.
Which form of energy causes sensation of hotness or coldness?
sound energy
light energy
heat energy
chemical energy
Which of the following is not an effect of heat?
Change in temperature
Change in state of matter
Change in dimensions
Change in position
Which of the following is not true about heat transfer?
It occurs from a body at a higher temperature to a body at a lower temperature.
It continues till the two bodies attain the same temperature.
It continues till thermal equilibrium is established.
It occurs from a body at a lower temperature to a body at a higher temperature.
What will be the coefficient of linear expansion if the length of a rod is increased from l1 to l2 for the rise in temperature of t °C?
(l2 - l1)/( l1 t)
(l2 - l1)/( l2 t)
(l2 - l1)/(t)
(l2 - l1)/( l1)
While constructing metal bridges some space is left to allow expansions of metal in the summer because
the metal contracts in the sun.
the metal in the bridge may increase in size.
the hot metal evaporates.
some metal parts can reach melting point.
Which of the following statement(s) is/are not correct about evaporation?
It is a surface phenomenon.
It takes place at all temperatures below boiling point.
It depends on the temperature of surroundings.
It occurs at the bottom of a liquid.
Click each box on the left and then click the matching box on the right.
