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Heat Test - 11

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Heat Test - 11
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  • Question 1
    1 / -0
    Ventilators are provided at the top of a room:
    Solution
    Hotter air has lower density in compare to cold air. The air we exhale is relatively hotter than the air present in the room so that hotter air moves upwards and normal air in the room seat downward. this process happens continuously, and at the top level in the room, hot air gets collected. To exhaust that air from the room we provide ventilators at the top. Ventilators also help to inter fresh air inside the room. The process of flow of air is known as conventional current.
    Hence Option C
  • Question 2
    1 / -0
    As we go down into the earth, the temperature .................... ?
    Solution
    As we go down into the earth, the temperature increases.
    Temperature increases due to the gas and pressure present inside the surface of the earth. The temperature increases because we go near to the core of the earth which is metallic and hotter.
  • Question 3
    1 / -0

    Directions For Questions

    Perhaps the highest temperature material you will ever see is the sun's outer atmosphere, or corona. At a temperature of about $$2 \times {10^6}$$  $$^oC$$ or $$3.6 \times {10^6}$$ $$ ^oF$$, the corona glows with a light that is literally unearthly. But because corona is also very thin, its light is rather faint. You can only see the corona during a total solar eclipse when the sun's disk is covered by the moon.

    ...view full instructions

    To measure high temperatures $$> 2500^oC$$, we use
    Solution
    Pyrometer can measure temperature ranging from $$ {50 }^{ \circ  }C\ to \  { 4000 }^{ \circ  }C $$
    All other measuring devices are used for temperatures below $$ {2500 }^{ \circ  }C$$
    Hence, Option D is correct
  • Question 4
    1 / -0
    Sun's heat reaches the earth by the process of:
    Solution
    Sun's heat reaches the earth by the process of radiation.
  • Question 5
    1 / -0
    The kinetic energy of molecules of a gas increases with:
    Solution
    B. Kinetic energy increases with rise in temperature.
  • Question 6
    1 / -0
    What is S.I. unit of temperature?
    Solution
    Hint: It is on the name of one a physicist.
    Solution: Step 1: Finding SI unit of temperature:
    One of the seven SI base units, the kelvin is the SI unit of thermodynamic temperature. Unlike the rest of the SI, the degree Celsius (°C) is a separate unit of temperature.
    Option A is correct.

  • Question 7
    1 / -0
    In a solid, heat is transferred mainly by the process of
    Solution
    Thermal conduction is the transfer of heat (internal energy) by rigorous vibration of the microscopic particles and transferring the energy from one particle to another without any real flow of the particles. For example, heat is conducted from the bottom of a saucepan in contact with a stove to the handle of the saucepan.
  • Question 8
    1 / -0
    A good insulator of heat is
    Solution
    A thermal conductor is a material that allows energy in the form of heat, to be transferred within the material, without any movement of the material itself. Eg. Metals.
    An insulator is a material that does not allow a transfer of electricity or heat. Materials that are poor thermal conductors can also be described as being good thermal insulators. Eg. trapped air
  • Question 9
    1 / -0
    Heat is not transferred by the process of convection in:
    Solution
    Convective heat transfer occurs within a fluid itself and it is carried out by transfer of one fraction of the fluid to the remaining portion. Hence unlike conduction, transfer of molecules occurs during convection. Since movement of particles constitutes convection, it is the macro form of heat transfer. Also convection is only possible in fluids where the particles can moved easily and the rate of convective heat transfer depends on the rate of flow to a great extend. In solids the particles are rigid and cannot move, so heat is not transferred by the process of convection in solids.
  • Question 10
    1 / -0
    Heat is transmitted from higher to lower temperature through actual mass motion of the molecules in
    Solution
    Conduction: It is the mechanism of heat transfer in which heat is transfer takes place by vibration of molecules and molecules will not leave their original position. 
    Convection: It is a mode of heat transfer by actual motion of mass. It is possible only in fluids.
    Radiation: It does not require any medium to transfer heat. It transfers heat by electromagnetic waves
    option (B) is the correct answer 
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