Additional questions with solutions: (Notes)
Que. – What is thermometer?
Ans. – A device which is used for recording temperature is known as thermometer.
Que. – What is clinical thermometer?
Ans. - A device which is used for recording body temperature is known as clinical thermometer.
Que. – What is the temperature of normal body?
Ans. – 37 °C
Que. – Which thermometer do not use mercury?
Ans. – Digital thermometer.
Que. – What is the range of clinical thermometer?
Ans. – 37 °C to 42 °C.
Que. – What is laboratory thermometer?
Ans. – The temperature of some other things are measured by a special kind of thermometer. Which range is generally –10°C to 110°C is known as laboratory thermometer.
Que. –Why should we use antiseptic solution to wash out the thermometer?
Ans. – After using the thermometer it get infected or may be isolated with germs. So we use antiseptic solution to wash out the thermometer.
Que. – What is conduction?
Ans. – The process by which heat is transferred from the hotter end to the colder end of an object is known as conduction.
Que. – Why does a metallic pot get heated when we kept it on a flame?
Ans. – Due to conduction.
Que. – How does the sun’s heat reaches to us?
Ans. – The heat of the sun reaches us by radiation.
Que. – What is convection?
Ans. – The process of transferring of heat in liquid like water is known as convection.
Que. – Define conductor of heat? Write with examples.
Ans. – The materials which allow to pass the heat from themselves easily are known as conductor of heat. EX. – copper, Iron, almunium etc.
Que. – Define bad conductor of heat with examples.
Ans. – the materials which does not allow to pass the heat from themselves are known as bad conductor of heat. Ex – wood, plastics etc.
Que. – What is radiation?
Ans. – The process of transferring the heat which does not need any medium is known as radiation. Ex – reaching the heat of the sun to us.
Que. – What are the modes to transfer the heat?
Ans. – There are three modes
(i) Conduction
(ii) Convection
(iii) Radiation
Que. – Why does it seem comfortable to put on deep coloured clothes in winter?
Ans. – The deep coloured surface usually absorbs more heat, so putting on deep coloured clothes in winter is comfortable.
Que. – Which colour absorbs more heat?
Ans. – Black.
Que. – Why should we put on the white dress in summer?
Ans. – Light colour or white dress reflects the most of the heat radiation and absorbs less heat so that it keeps us comfortable.
Que. – Why do woolen clothes keep us warm in winter?
Ans. - woolen clothes keep us warm in winter because the wool is bad conductor of heat. The airs trap among its fibers.
Que. – by which mode of transferring of heat will take place in copper?
Ans. – conduction.
