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Why machine parts are not jammed in the ...

Why machine parts are not jammed in the summer?

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The coefficient of viscosity of the lubricating oil gets increased due to fall in temperature. Due to this, oil becomes more thin and therefore various machine parts are not jammed.
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PREMIERS PUBLISHERS-PROPERTIES OF MATTER-OTHER IMPORTANT QUESTION & ANSWERS (CONCEPTUAL QUESTIONS)
  1. Why is it easier to swim in sea water than in river water?

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  2. Stirred liquid comes to rest after some time. Why?

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  3. Why machine parts are not jammed in the summer?

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  4. Which fall faster-big rain drops or small rain drops?

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  6. Why hot soup tastes better than cold soup?

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  7. Why new earthen pots keep water cooler than the old one?

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  8. Explain why some oils spread on water, when others float as drops.

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  9. Out of friction force and viscous force which depends upon velocity.

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  12. Why aeroplanes and cars have streamline shape?

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  14. Why hot water is preferred to cold water for washing clothes?

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  16. A person standing near a speeding train has a danger of falling toward...

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  17. Why a small bubble rises slowly through a liquid whereas the bigger bu...

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  18. Mercury does not wet the glass. Why?

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  19. A needle floats in clean water, but sinks in soap solution. Why?

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  20. A piece of chalk when immersed in water emits bubbles. Why?

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