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Give scientific reasons: The telephone ...

Give scientific reasons:
The telephone wires which sag in summer become straight in winter.

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  1. Give scientific reasons: In winter why does an iron pillar feel colde...

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  2. Give scientific reasons: An ordinary glass bottle cracks when boiling...

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  3. Give scientific reasons: The telephone wires which sag in summer beco...

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  4. Use your brain power: Why is there a gap at the joints of rails and o...

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  5. Use your brain power: Why is mercury or alcohol used in a thermometer...

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  6. Give reason : Why does a hot substance not remain hot after two or th...

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  7. Rub your palms against each other and put them on your cheeks. What do...

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  8. Apparatus: Bars of stainless steel, aluminium and copper, a candle, a ...

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  9. Apparatus: A beaker, potassium permaganate crystals, a burner, water, ...

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  10. Light a candle and stand it upright. Hold your hands on its two sides ...

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  11. Light a candle and stand it upright. Hold your hands on its two sides ...

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  12. Apparatus: Two aluminium tins of the same size, two small galsses, wat...

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  13. Apparatus: Glass bottle, baloon, hot water, etc. : Procedure: Fix a b...

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  14. Answer the question in short: What is meant by thermoware?

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  15. Oral Work : What is conduction of heat?

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  16. Oral Work : What will happen when only upper part of liquid is heated...

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  17. Oral Work : How does the heat of the sun reach us?

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  18. Oral Work : How can we see objects at night using infrared camera?

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  19. Solve the following crossword puzzle. : Across: Thermos flask was i...

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  20. Project : Make a note of the various example of heat transfer seen in...

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