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Heat

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Question
CBSEENSC7001096
Wired Faculty App

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

Solution

Similarities:

(i) Both clinical and laboratory thermometers have long, narrow, uniform glass tubes.

(ii) The bulbs of both the thermometers have mercury in them.

Differences:

(i) The temperature range of clinical thermometers is from 35°C to 42°C while that of laboratory thermometer is from −10°C to 110°C.

(ii) Clinical thermometer is used to measure the temperature of a human body. However, laboratory thermometer cannot be used to measure the temperature of a human body.

(iii) The least count of both the thermometers differs.

(iv) Unlike clinical thermometer that can be tilted, laboratory thermometer is kept upright while reading the temperature values.

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Question
CBSEENSC7001097
Wired Faculty App

Give two examples each of conductors and insulators of heat.

Solution

Two examples of conductors of heat are:

(i) Aluminium

(ii) Iron

Two examples of insulators of heat are:

(i) Wood

(ii) Plastic

Question
CBSEENSC7001098
Wired Faculty App

Fill in the blanks:

(a) The hotness of an object is determined 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.

Solution

temperature

,

clinical

,

Celsius

,

radiation

,

conduction

,

dark

Question
CBSEENSC7001099
Wired Faculty App

Match the following:

A. Land breeze blows during (i) summer
B. Sea breeze blows during (ii) winter
C. Dark coloured clothes are preferred during (iii) day
D. Light coloured clothes are preferred during (iv) night

Solution

A.

Land breeze blows during

(i)

night

B.

Sea breeze blows during

(ii)

day

C.

Dark coloured clothes are preferred during

(iii)

winter

D.

Light coloured clothes are preferred during

(iv)

summer

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