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Heat Test - 20

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Weekly Quiz Competition
  • Question 1
    1 / -0
    Insulators have very high:
    Solution
    The specific heat capacity of a substance is the amount of heat required to raise the temperature of unit mass of substance through $$1^{o} \ C$$.
    The insulators don't allow the heat to pass through them easily. A large amount of heat is required to raise their temperature even by $$1^{o} \ C$$ because insulators have high specific heat capacity.
  • Question 2
    1 / -0
    Conductors require __________ heat energy to get heated.
    Solution
    Conductors have very low specific heat capacity (c), therefore heat required $$(Q)$$ to raise their temperature to a certain range is also less by the following relation: $$Q\propto c$$
  • Question 3
    1 / -0
    In general, metals have very low :
    Solution
    In general, metals are good conductors. So they offer less resistance to the flow of current. Thus, metals have very low resistivity.
  • Question 4
    1 / -0
    Why do insulators take larger time to heat up?
    Solution
    Substances that don't allow heat to easily pass through them are known as insulators. They cannot pass the heat easily through them.  Therefore, the unit mass of an insulator requires more heat to raise its temperature by $$1^{o}$$ i.e. specific heat capacity of insulators is very high or we can say they need more heat per degree rise in temperature.
  • Question 5
    1 / -0
    Substances which do not allow heat to easily pass through them are known as
    Solution
    Substances which don't allow heat to easily pass through them are known as insulators. Insulators have crystal structure of molecules, molecules are far from each other, compared to conductors. Hence they cannot pass the heat easily through them, besides this insulators don't have free electrons to pass heat more quickly.
  • Question 6
    1 / -0
    Substances which allow heat to pass through them easily are known as
    Solution
    Substances which allows heat to pass through them easily are known as Conductors.
    Substances which don't allow heat to pass through them easily are known as Insulators.
    Substances which allows current to pass through them in some conditions are known as Semiconductors. 
  • Question 7
    1 / -0
    In the convection process rate of heat transfer is compared in the option between gas and liquid, choose the correct statement
    Solution
    In liquids, particles are neither too close nor too far but comparatively closer than gas; so liquid convects more as compared to gas. At $$0^{\circ}C$$ and $$4^{\circ}C$$ when density is more; the rate of convection decreases. But when the density of water is normal i.e. at room temperature, the convection rate of water is pretty good. Density only affects the rate of convection.
  • Question 8
    1 / -0
    Water is poured into a pan and heated over a flame. After some time, the hot water begins rising to the top. Which type of heat transfer is involved in this ?
    Solution
    Convection is heat transfer by mass motion of a fluid such as air or water when the heated fluid is caused to move away from the source of heat, carrying energy with it. Convection above a hot surface occurs because hot air expands, becomes less dense, and rises.
  • Question 9
    1 / -0
    An insulator is a non-metallic substance which :
    Solution
    An electrical insulator is a material whose internal electric charges do not flow freely because of extremely high resistance. Very little electric current will flow through it under the influence of a potential difference applied.
  • Question 10
    1 / -0
    Our body temperature cannot fall below:
    Solution
    Our body temperature cannot fall below $$35^{o}C$$ or $$95^{o}F$$, because below this temperature body will suffer hypothermia.
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