Physics
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 |
Heat Energy
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Answer
| Column A | Column B |
|---|---|
| (a) Blowing air increases | (v) evaporation |
| (b) Increase in pressure increases | (iv) boiling point |
| (c) Thermal expansion | (i) increase in inter-molecular separation |
| (d) Invar | (ii) pendulum of a clock |
| (e) Pyrex glass | (iii) cooking utensils |
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Related Questions
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.
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.
What is matter? What is it composed of?
Do all the molecules of a liquid take part in evaporation? If not, explain your answer.