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Why are small holes provided at the bott...

Why are small holes provided at the bottom of the chimney of the oil lamp?Explain.

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JBD PUBLICATION-PROPERTIES OF BULK MATTER-EXAMPLE
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  2. Write one difference between natural convection and forced convection.

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  3. Why are small holes provided at the bottom of the chimney of the oil l...

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  4. Out of two thermos flasks of same height and capacity but one having c...

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  5. State Newton's law of cooling.

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  6. Is the bulb of a thermometer made of diathermic or adiabatic wall?

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  7. Why does a metal bar appear hotter than a wooden bar at the same tempe...

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  8. Calculate the temperature which has same numerical value on Celsius an...

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  9. These days people use steel utensils with copper bottom. This is suppo...

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  10. One day in the morning, Ramesh filled up 1/3 bucket of hot water from ...

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  11. One day in the morning, Ramesh filled up 1/3 bucket of hot water from ...

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  12. Distinguish between elasticity and plasticity.

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  13. Define plasticity.

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  14. Two wires are made of the same metal .The length of teh first wire is ...

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  15. What is elastic hystersis?

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  16. A beam is supported at two ends and loaded at the middle.What is the e...

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  17. A liquid surface is horizontal. why?

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  19. Can young's modulus of a solid be different for extension(tensile) and...

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  20. Why springs are made of steel and not of copper?

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