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A piece of paper wrapped tightly on a wo...

A piece of paper wrapped tightly on a wooden rod is found to get charged quickly when held over a flame compared to similar piece when wrapped on a brass rod This is because .

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SL ARORA-Thermal Properties of Matter-Exercise
  1. When we step barefoot into an office with a marble floor, we feel cold...

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  2. We can easily boil water in a paper cup. Why?

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  3. A piece of paper wrapped tightly on a wooden rod is found to get charg...

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  4. Woolen cloths are worn in winter but not in summer. Why?

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  5. Stainless steel cooking pans are perferred with extra copper bottoms. ...

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  6. If a drop of water falls on a very hot iron, it does not evaporates fo...

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  7. Explain why a brass tumbler feels much colder than a wooden tray on a ...

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  8. Usually a good conductor of heat is a good conductor of electricity al...

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  9. Why do electrons in insulators not contribute to its conductivity?

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  10. As air is a bad conductor of heat, whu do we not feel warm without clo...

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  11. Room are provided with the ventilators near the roof. Why?

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  12. Why snow is better heat insulator than ice?

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  13. We cannot boil water inside the earth's satellite. Explain.

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  14. Water is heated from below but not from top. Why?

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  15. Statement-1: Coolant coils are fitted at the top of a refrigerator , f...

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  16. The earth constantly receives heat radiation from the sun and gets war...

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  17. Animals curl into a ball, when they feel very cold.

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  18. A poor emitter has a large reflectivity. Explain why.

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  19. when a piece of red glass heated in a furnace is taken out, it glows w...

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  20. Two stars radiate maximum energy at wavelength 3.6 xx 10^(-7)m and 4.8...

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