Physics
Fill in the blanks:
(a) Boiling occurs at …………… .
(b) Evaporation takes place at …………… .
(c) The molecules of liquid …………… heat from surroundings in evaporation.
(d) Heat is …………… during boiling.
(e) Cooling is produced in …………… .
(f) A longer rod expands …………… than a shorter rod on being heated to the same temperature.
(g) Liquids expand …………… than the solids.
(h) Gases expand …………… than the liquids.
(i) Alcohol expands …………… than water.
(j) Iron expands …………… than copper.
Heat Energy
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Answer
(a) Boiling occurs at a fixed temperature.
(b) Evaporation takes place at all temperatures.
(c) The molecules of liquid absorb heat from surroundings in evaporation.
(d) Heat is absorbed during boiling.
(e) Cooling is produced in evaporation.
(f) A longer rod expands more than a shorter rod on being heated to the same temperature.
(g) Liquids expand more than the solids.
(h) Gases expand more than the liquids.
(i) Alcohol expands more than water.
(j) Iron expands less than copper.
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Related Questions
Assertion (A) : Glass containers with narrow necks are more likely to break when hot water is poured into them suddenly.
Reason (R) : Glass is a good conductor of heat.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Assertion (A) : A gas expands less than a liquid for the same rise in temperature.
Reason (R) : Gases have negligible intermolecular forces of attraction.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- Assertion is true but reason is false
- Assertion is false but reason is true
Write true or false for each statement:
(a) Evaporation is rapid on a wet day.
(b) Evaporation takes place only from the surface of a liquid.
(c) All molecules of a liquid take part in the process of evaporation.
(d) Temperature of a liquid rises during boiling or vaporization.
(e) All molecules of a liquid take part in boiling.
(f) Boiling is a rapid phenomenon.
(g) All solids expand by the same amount when heated to the same rise in temperature.
(h) Telephone wires are kept tight between the two poles in winter.
(i) Equal volumes of different liquids expand by different amounts when they are heated to the same rise in temperature.
(j) Solids expand the least and gases expand the most on being heated.
(k) A mercury thermometer makes use of the property of expansion of liquids on heating.
(l) Kerosene contracts on heating.
Match the following:
Column A Column B (a) Blowing air increases (i) increase in inter-molecular separation (b) Increase in pressure increases (ii) pendulum of a clock (c) Thermal expansion (iii) cooking utensils (d) Invar (iv) boiling point (e) Pyrex glass (v) evaporation