Science

Heat

Question:

State similarities and differences between the laboratory thermometer and the clinical thermometer.

Answer:

Similarities:
(i) Both thermometers consist of long narrow uniform glass tubes.
(ii) Both have a bulb at one end.
(iii) Both contain mercury in bulb.
(iv) Both use Celsius scale on the glass tube.
Differences:
(i) A clinical thermometer reads temperature 35 °C to 45 °C while the range of laboratory thermometer is -10 °C to 110 °C.
(ii) Clinical thermometer has a kink near the bulb while there is no kink in the laboratory thermometer.
Due to kink mercury does not fall down on its own in clinical thermometer.

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Heat

Q 1.

Fill in the blanks
The hotness of an object is detetmined by its ____________ .
(b) Temperature of boiling water cannot be measured by a ____________ 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.

Q 3.

In places of hot climate it is advised that the outer walls of houses be painted white. Explain.

Q 4.

Discuss why wearing more layers of clothing during winter keeps us warmer than wearing just one thick piece of clothing?

Q 5.

State similarities and differences between the laboratory thermometer and the clinical thermometer.

Q 6.

Give two examples each of conductors and insulators of heat.

Q 7.

Look at figure 4.6. Mark where the heat is being transferred by conduction, by convection and by radiation