Fill in the blanks:
a. The hotness of an object is determined by its _____.
b. Temperature of boiling water cannot be measured by _______ thermometer.
c. Temperature is measured in degree ______.
d. No medium is required for transfer of heat by the process of _______.
e. A cold steel spoon is dipped in a cup of hot milk. It transfers heat to its other end by the process of _______.
f. Clothes of ______ colours absorb heat better than clothes of light colours.
Match the following:
|i. Land breeze blows during||(a) summer|
|ii. Sea breeze blows during||(b) winter|
|iii. Dark coloured clothes are preferred during||(c) day|
|iv. Light coloured clothes are preferred during.||(d) night|
Go to a doctor or your nearest health centre. Observe the doctor taking temperature of patients. Enquire:
a. why she dips the thermometer in a liquid before use.
b. whey the thermometer is kept under the tongue.
c. whether the body temperature can be measured by keeping the thermometer at some place other than the mouth.
d. whether the temperature of different parts of the body is the same or different.
You can add more questions which come to your mind.
Take two similar transparent glasses of bottles having wide mouths. Put a few crystals of potassium permanganate or pour a few drops of ink in the bottle. Fill this bottle with hot water. Fill the other bottle with cold water. Cover the cold water bottle with a thick piece of paper such as a post card. Press the post card firmly with one hand and hold the bottle with the other hand. Invert the bottle and place it on top of the hot water bottle. Hold both the bottles firmly. Ask some other person to pull the post card. Observe what happens. Explain.