Q.1: 1 kilojoule = ________ joules
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
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
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.
Q.9: “Thermo” is a Latin word which means ____________.
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.
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.
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.
Q.16: ____________ thermometers do not use mercury.
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.
Q.18: At _____________, the land cools more quickly than the sea.
Q.19: Liquids and gases are heated by the __________ process.
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.
Q.22: False ceilings are generally made up of _____________.
b) Plaster of Paris
Q.23: Most liquids and gases are ___________ conductors of heat.
Q.24: ____________ can not take place in vacuum.
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