ICSE-VIII-Physics
06: Heat Energy Class 8 Physics
- #2Fill 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.Ans : (a) Boiling occurs at a fixed temperature. (b) Evaporation takes place at all temperature. (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.
- #2-aBoiling occurs at _____Ans : Boiling occurs at a fixed temperature.
- #2-bEvaporation takes place at ____Ans : Evaporation takes place at all temperature.
- #2-cThe molecules of liquid ____ heat from surroundings in evaporation.Ans : The molecules of liquid absorb heat from surroundings in evaporation.
- #2-dHeat is _____ during boiling.Ans : Heat is absorbed during boiling.
- #2-eCooling is produced in _____.Ans : Cooling is produced in evaporation.
- #2-fA longer rod expands _____ than a shorter rod on being heated to the same temperature.Ans : A longer rod expands more than a shorter rod on being heated to the same temperature.
- #2-gLiquids expand _____ than the solids.Ans : Liquids expand more than the solids.
- #2-hGases expand _____ than the liquids.Ans : Gases expand more than the liquids.
- #2-iAlcohol expands _____ than water.Ans : Alcohol expands more than water.
- #2-jIron expands _____ than copper.Ans : Iron expands less than copper.