Self Studies
Self Studies
Self Studies
Self Studies

Heat Test - 12

Result Self Studies

Heat Test - 12
  • Score

    -

    out of -
  • Rank

    -

    out of -
TIME Taken - -
Self Studies

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Self Studies Self Studies
Weekly Quiz Competition
  • Question 1
    1 / -0
    Name a metal among the following having highest heat conductivity .
    Solution
    Following are the thermal conductivities of the following metals and alloys: ( in $$wK/m$$ )
    $$Silver-430 \\ Copper-400 \\ Aluminium-235 \\ Brass-109$$
    Order of thermal (heat) conductivity:
    $$Silver \gt Copper \gt Aluminium \gt Brass$$
    So, Silver has highest thermal conductivity
  • Question 2
    1 / -0
    Which of the following is the very poor conductor of heat ?
    Solution
    Water is the poor conductor among all. As it is liquid and liquids generally have low heat conductivity than solids. Tighter the molecules are held, more the vibrational energy can transfer between them, heat is no more than vibrating molecules. If we talk about steam, its molecules are less tightly held. But it's important to note that we are talking here of heat conductivity not convection or radiation and contact surface area with heat source.
  • Question 3
    1 / -0
    Heat transfer is done by:
    Solution
    Convection is one of the methods of heat transfer. In this method, heat is transferred in fluid from one part to another part by the means of movement of the molecules of the fluid.
  • Question 4
    1 / -0
    If a liquid is heated in weightlessness, the heat is transmitted through
    Solution
    $$Weightlessness$$ means there is no proper interaction between molecules. So the heat cannot go through $$convention$$. The only way is to go by $$conduction. Radiation$$ is also not possible in the case of liquids.
  • Question 5
    1 / -0
    In convection, heat is transferred
    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. The transfer of molecules occurs during convection. Since the movement of particles constitutes convection, it is the macro form of heat transfer. Also, convection is only possible in fluids where the particles can move easily and the rate of convective heat transfer depends on the rate of flow to a great extend.
  • Question 6
    1 / -0
    Name a medium which is a good insulator of heat.
    Solution
    Trapped (still) air is good insulator.
    Thermal conductivity of air is small as compared to solid and liquid. Eg- glass conducts 30 times more power per unit distance per unit temperature than air.
    The less dense the material, the less thermal conductivity. And gas (air) is least dense than solid and liquid.
  • Question 7
    1 / -0
    Which of the following is not a scale of temperature?
    Solution
    Richter scale is used to measure the intensity of earthquakes.
  • Question 8
    1 / -0
    More energetic molecules of a body transfer some of their energy to other molecules, without any change in their position in:
    Solution
    Conduction is defined as the process of transferring heat from one molecule to another molecule without the actual movement of molecules.
    Here, more energetic molecules of a body transfer some of their energy to other molecules, without any change in their position.
  • Question 9
    1 / -0
    When we touch a steel rod and a paper simultaneously, we feel that the rod is colder because:
    Solution
    When we touch a steel rod and a paper simultaneously in winter, we feel the rod is comparatively colder because steel being a good conductor of heat, heat from our hand flows to steel but there is no transfer of heat from our hand to paper as it is an insulator of heat. So we don't feel cold when we touch a paper but we do when we touch a steel rod.
  • Question 10
    1 / -0
    The fastest mode of transfer of heat is
    Solution
    The energy transferred by radiation propagates with the speed of light . In radiation , heat is transferred by electromagnetic waves , which have the fastest speed , so it is the fastest mode of heat transmission .
Self Studies
User
Question Analysis

  • Correct -

  • Wrong -

  • Skipped -

My Perfomance
  • Score

    -

    out of -
  • Rank

    -

    out of -
Re-Attempt Weekly Quiz Competition
Self Studies Get latest Exam Updates
& Study Material Alerts!
No, Thanks
Self Studies
Click on Allow to receive notifications
Allow Notification
Self Studies
Self Studies Self Studies
To enable notifications follow this 2 steps:
  • First Click on Secure Icon Self Studies
  • Second click on the toggle icon
Allow Notification
Get latest Exam Updates & FREE Study Material Alerts!
Self Studies ×
Open Now