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1) The substances through which heat does not conduct easily are called a. bad conductors b. good conductors c. good convections d. bad convections
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2) The rate of emission of radiation depends on a. color and texture of surface b. surface temperature c. surface area d. all of above
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3) The movement of cold air from the land towards the sea is called a. wind energy b. planetary wind c. land breeze d. sea breeze
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4) In home utensils such as handles of sauce-pans, spoons, hot-plates etc. we use a. plasma b. good conductors c. bad conductors d. mercury
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5) White and polished surface reflects more heat than a. black surface only b. rough surface only c. polished surface d. black and rough surface
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6) The surface which absorbs more heat is a. black and rough b. white and rough c. red and rough d. pink and rough
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7) Thermal conductivity of air is a. 0.026 Wm-1 K-1 b. 0.75 Wm-1 K-1 c. 0.59 Wm-1 K-1 d. 1.58 Wm-1 K-1
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8) If the cross sectional area is larger, the rate of flow of heat will be a. zero b. constant c. smaller d. greater
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9) The heat flow rate depends on a. cross sectional area of solid b. length of solid c. temperature difference between ends d. all of above
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10) Eagles fly without flapping their wings due to a. air currents b. sun radiation c. thermal climbing d. none of above
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