CBSE Questions for Class 7 Physics Heat Quiz 9 - MCQExams.com

What does the bulb of a clinical thermometer contain?
  • Water
  • Mercury
  • Iron
  • Zinc
Wool is used in making garments used in winter because
  • Wool is a good conductor of heat
  • Wool is a bad conductor of heat
  • Air, trapped in between the wool fibres, prevents the flow of heat from our body to the cold surroundings.
  • Both B and C
Choose the correct option
  • Temperature of a water kept inside a beaker is measured when the laboratory thermometer is held inside the water
  • Temperature of a water kept inside a beaker is measured when the laboratory thermometer is removed from the water
  • Temperature of our body is measured when the clinical thermometer is kept inside the mouth
  • Temperature of our body is measured when the clinical thermometer is removed from the mouth
Which of the following is the range of temperature recorded by a laboratory thermometer ?
  • $$0^oC$$ to $$100^oC$$
  • $$-10^oC$$ to $$110^oC$$
  • $$30^oC$$ to $$120^oC$$
  • $$45^oC$$ to $$145^oC$$
How should a thermometer be dipped inside beaker containing water
  • Vertically
  • Tilted
  • Any of the above way
  • None of the above way
Choose the correct option 
  • A clinical thermometer should be washed using water before and after use
  • A clinical thermometer should be washed using antiseptic solution before and after use
  • A clinical thermometer can be used after it is heated by fire
  • None of the above
A laboratory thermometer is dipped in a beaker containing ice. As the thermometer is removed the mercury level will
  • rise
  • fall
  • either rise or fall depending upon how much ice is kept inside the beaker
  • neither rise nor fall
Which of the following is not true about Laboratory thermometers ?
  • Laboratory thermometers are used to measure temperatures with a high degree of precision.
  • Laboratory thermometers are used to measure body temperature.
  • Range of laboratory thermometer is -10C to 110C
  • Laboratory thermometers are designed for lab purposes such as checking boiling point, freezing point etc.
Which of the following minimizes the transference of heat in a thermos flask?
$$1$$. Conduction
$$2$$. Convection
$$3$$. Radiation
  • $$2$$ and $$3$$
  • $$1$$ and $$2$$
  • $$1, 2$$ and $$3$$
  • $$1$$ and $$3$$
Two thin blankets are warmer than one blanket of their combined thickness, this happens, because 
  • one blanket is heavier
  • Double layer prevent transmission of heat
  • Two blankets have large mass
  • None of the above
An ideal thermometer should have
  • Small heat capacity
  • Large heat capacity
  • Medium heat capacity
  • Variable heat capacity
A long silver tea spoon is placed in a cup filled with hot tea. After some time, the exposed end (the end which is not dipped in tea) of the spoon becomes hot even without a direct contact with the tea. This phenomenon can be explained mainly by_______
  • conduction
  • reflection
  • radiation
  • thermal expansion
Choose the correct answer from the alternatives given :
For measuring very high temperature, we use
  • Mercury thermometer
  • Thermoelectric pyrometer
  • Platinum resistance thermometer
  • None of the above
When a mercury thermometer is inserted into a pot of hot water. What temperature does the reading of the thermometer tell?
  • Temperature of water and surroundings
  • Temperature of the hot water
  • Temperature of the surroundings
  • Temperature of the pot
Thermocole lined box is used as a cold storage because:
  • Thermocole is a bad conductor
  • It is cheaper
  • It is easier to construct
  • None of these
Glass cracks when heated; while a metal does not because
  • Glass is bright
  • Glass has pores inside
  • Glass is a bad-conductor
  • None of these
Heat from the sun is received by the earth through
  • Radiation
  • Convection
  • Conduction
  • None of the above
Thermal insulation is used to 
  • stop the flow of heat
  • reduce the flow of heat
  • absorb heat
  • reverse the heat flow direction
In which of the following process convection does not take place primarily?
  • Sea and land breeze
  • Trade wind
  • Boiling of water
  • Warming of glass of bulb due to filament
In which of the following processes, convection does not take place primarily?
  • Sea and land breeze
  • Boiling of water 
  • Heating air around a furnace
  • Warming of glass of bulb due to filament
The Process of convection is faster than 
  • Conduction
  • Radiation
  • Both conduction and convection
  • Neither conduction nor radiation
The thermal radiations are similar to
  • $$X-$$rays
  • Cathode rays
  • $$\alpha -$$rays
  • Sound waves
The energy from the sun reaches the earth by 
  • Conduction
  • Radiation
  • Convection
  • All the above

In which of the following process, convection does not take place primarily?
  • Sea and land breeze
  • Boiling of water
  • Warming of glass bulb due to filament
  • Heating air around furnace
Two thermometers are constructed in the same way except that one has a spherical bulb and the other a cylindrical bulb; which one will respond quickly to temperature changes?
  • Spherical bulb thermometer
  • Cylindrical bulb thermometer
  • both equally
  • either
Glass is a good conductor of heat.
  • True
  • False
Mark correct option or options :
  • Sun temperature is measured by radiation pyrometer
  • Insect temperature is measured by thermocouple thermometer
  • Moon's temperature is measured by thermometer
  • Both A and B
Figure (a, b, c, d) shows a student reading a doctor's thermometer. Which of the figure indicates the correct method of reading temperature?
All bodies radiate heat at all temperature except at
  • $$0^0C$$
  • $$100^0C$$
  • $$0K$$
  • Absolute temperature
A beggar wrapped himself with a few layers of newspaper on a cold winter night. This helped him to keep himself warm because
  • Friction between the layers of newspaper produces heat.
  • Air trapped between the layers of newspaper is a bad conductor of heat.
  • Newspaper is a conductor of heat.
  • Newspaper is at a higher temperature than the temperature of the surrounding.
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