1) Central heating systems in buildings work on the principle of a. convection b. radiation c. conduction d. all of above
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2) The good conductors of heat is a. water b. wool c. rubber d. metal
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3) The process in which heat is transferred in form of waves is called a. Conduction b. convection c. thermal climbing d. radiation
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4) Central heating system in buildings work on the principle of a. convection b. fusion c. radiation d. conduction
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5) As compared to non-metals, heat reaches from the hot part to the cold parts of the metal objects a. slowly b. quickly c. equal time d. none of above
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6) A metal box having four faces of different nature is called a. Leslie triangle b. Leslie hexagon c. Leslie pentagon d. Leslie cube
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7) The rising currents of hot air are called a. air currents b. thermals c. radiation d. layers
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8) Poor conductors of heat are a. liquids only b. gases only c. metals d. liquids and gases
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9) The mode of transfer of heat by vibrating atoms and free electrons in solids from hot to cold parts of a body is known as heat's a. radiation b. convection c. conduction d. fusion
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10) The rate of heat flow is a. directly proportional to length b. inversely proportional to length c. not related to length d. none of above
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11) The materials which trap air inside them are a. bad conductors of heat b. good conductors of heat c. moderately conducts heat d. transfer heat by convection
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12) When temperature of an object is higher than its surroundings then as compare to absorbing, it is radiating a. more heat b. less heat c. equal heat d. zero heat
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