9th Physics Chapter 7 MCQs
9th Physics Chapter 7 MCQs.
7.1 How do the molecules in a solid behave?
(a) Move randomly
(b) Vibrate about their mean positions
(c) Rotate and vibrate randomly at their own positions
(d) Move in a straight line from hot to cold ends.
Correct option is (b)
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7.2 What type of motion is of the molecules in a gas?
(a) Linear motion
(b) Random motion
(c) Vibratory motion
(d) Rotatory motion
Correct option is (b)
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7.3 Temperature of a substance is:
(a) the total amount of heat contained in it
(b) the total number of molecules in it
(c) degree of hotness or coldness
(d) dependent upon the intermolecular distance
Correct option is (c)
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7.4 Heat is the:
(a) total Kinetic energy of the molecules
(b) the internal energy
(c) work done by the molecules
(d) the energy in transit
Correct option is (d)
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7.5 In Kelvin scale, the temperature corresponding to melting point of ice is:
(a) zero
(b) 32
(c) -273
(d) +273
Correct option is (d)
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7.6 The temperature which has the same value on Celsius and Fahrenheit scale is:
(a) -40
(b) +40
(c) +45
(d) -45
Correct option is (a)
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7.7 Which one is a better choice for a liquid-in-glass thermometer?
(a) Is colourless
(b) Is a bad conductor
(c) Expand linearly
(d) Wets glass
Correct option is (c)
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7.8 One disadvantage of using in a liquid-in-glass thermometer:
(a) it has large expansivity
(b) it has low freezing point(-112 degree Celsius)
(c) it wets the glass tube
(d) its expansion is linear
Correct option is (c)
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7.9 Water is not used as a thermometric liquid mainly due to:
(a) colourless
(b) a bad conductor of heat
(c) non-linear expansion
(d) a low boiling point(100 degree Celsius)
Correct option is (c)
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7.10 A thermometer has a narrow capillary tube so that it:
(a) quickly responds to temperature changes
(b) can read the maximum temperature
(c) gives a large change for a given temperature rise
(d) can measure a large range of temperature
Correct option is (c)
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7.11 Which thermometer is most suitable for recording rapidly varying temperature?
(a) Thermocouple thermometer
(b) Mercury-in-glass laboratory thermometer
(c) Alcohol-in-glass thermometer
(d) Mercury-in-glass clinical thermometer
Correct option is (a)
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