Ch – 4 Heat & Its Effects

Q.1: 1 kilojoule = ________ joules

a) 100

b) 1,000

c) 10,000

Q.2: Why does your hands become warm when you rub them together ?

a) Because heat energy gets converted into mechanical energy

b) Because mechanical energy gets converted into chemical energy

c) Because mechanical energy gets converted into heat energy

Q.3: Why do the molecules move freely inside the liquids ?

a) Because the molecules are more tightly packed than solids

b) Because the molecules are more loosely packed than solids

c) Because the molecules are more loosely packed than gas

Q.4: Which of the following precautions have to be followed while reading a thermometer ?

i) Read the thermometer by holding it horizontally

ii) Hold the thermometer by its bulb

iii) Thermometer should be washed only before the use

a) only iii

b) i and ii

c) only i

Q.5: The flow of heat from a body at a higher temperature to another body or another part of the same body at a lower temperature is known as ____________.

a) heat cycle

b) transfer of heat

c) none

Q.6: Why are gaps left between two sections of the rail tracks ?

a) For expansion of rail tracks during summer

b) For contraction of rail tracks during summer

c) Both

Q.7: Liquid thermometers are based on the principle that ________________.

a) liquids contract on heating

b) liquids expand on heating

c) liquids expand on cooling

Q.8: The force of attraction in _______ molecules is almost negligible.

a) solid

b) liquid

c) gas

Q.9: “Thermo” is a Latin word which means ____________.

a) heat

b) cold

c) wet

Q.10: The ________________ is the temperature at which pure water boils at the sea level.

a) lower fixed point

b) medium fixed point

c) upper fixed point

Q.11: India has adopted __________ scale for measuring body temperature.

a) Celsius

b) Kelvin

c) Fahrenheit

Q.12: Celsius scale is named after the Swedish scientist ______________.

a) Anders Celsius

b) Francis Celsius

c) John Celsius

Q.13: The interval between two fixed points on a ____________ scale is divided into 180 divisions.

a) Celsius

b) Kelvin

c) Fahrenheit

Q.14: Fahrenheit scale is named after _________________.

a) Daniel Gabriel Fahrenheit

b) Douglas Fahreheit

c) Johsnon Fahrenheit

Q.15: The capillary tube in the laboratory thermometer is protected by a thick glass tube called _________ of the thermometer.

a) root

b) stem

c) body

Q.16: ____________ thermometers do not use mercury.

a) Laboratory

b) Digital

c) Clinical

Q.17: The ____________ in clinical thermometer prevents the movement of mercury back into the bulb when the thermometer is taken out of a person’s mouth.

a) stem

b) kink

c) both

Q.18: At _____________, the land cools more quickly than the sea.

a) day

b) noon

c) night

Q.19: Liquids and gases are heated by the __________ process.

a) conduction

b) convection

c) radiation

Q.20: The heat transferred without the need of any medium is known as ____________.

a) radiant heat

b) radiation heat

b) red heat

Q.21: ___________ is the fastest mode of heat transfer.

a) conduction

b) convection

c) radiation

Q.22: False ceilings are generally made up of _____________.

a) asbestos

b) Plaster of Paris

c) Both

Q.23: Most liquids and gases are ___________ conductors of heat.

a) good

b) bad

c) excellent

Q.24: ____________ can not take place in vacuum.

a) conduction

b) convection

c) both

Q.25: Why is glass chosen as the material for making the thermos flask ?

a) Because it is a bad conductor of heat

b) Because it is a good conductor of heat

c) Because it is transparent

Published by Priya Prakash

In the midst of winter, i found there was within me an invincible summer ~ Albert Camus

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