Chapter 4 heat and its affects of cordova learning series question and answers
Answers
Answer:
Solution 1
Similarities:
(i) Both consist a long, narrow, uniform glass tube.
(ii) Both have a bulb at one end.
(iii) Both contains mercury in the bulb.
(iv) Both contain Celsius scale on the glass tube.
Explanation:
Differences:
Clinical thermometer Laboratory thermometer
Temperature range is from 35°C to 42°C. Temperature range is from – 10°C to 110°C.
It is used to measure temperature of human body. It is used to measure temperature in experiments performed in laboratory.
It has a kink which prevents the immediate back flow of mercury. Usually, it does not have a kink.
Solution 2
Two examples of conductors of heat are:
(i) Copper
(ii) Iron
Two examples of insulators of heat are:
(i) Wood
(ii) Plastic
Concept insight: Conductors are the objects which allow heat to pass through them easily. Insulators are the objects which do not allow heat to pass through them easily.
Solution 3
(a) Temperature
(b) Clinical thermometer.
Concept insight: Laboratory thermometer is used to measure temperature of boiling water.
(c) Celsius
Concept insight: Temperature is expressed in the unit of 'degree celsius'.
(d) Radiation
Concept insight: Heat can be transferred by radiation even through vacuum.
(e) Conduction
Concept insight: Conduction is the process of heat transfer from hotter part to colder part without the movement of material as a whole.
(f) Dark
Concept insight: Dark coloured clothes absorb more heat radiations while light coloured clothes reflect most of the heat radiations that fall on them.
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