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Why a small gap is left between the iron rails of railway tracks ?

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SL ARORA-Thermal Properties of Matter-Exercise
  1. The diameters of steel. rods A and B having the same length are 2 cm a...

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  2. The difference between lenghts of a certain brass rod and of a steel r...

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  3. Why a small gap is left between the iron rails of railway tracks ?

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  4. Pendulum clocks generally go fast in winter and slow in summer.Why ?

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  5. Why is inver used in making a clock pendulum?

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  6. A brass disc fits snugly in a hole in a steel plate. Should you heat o...

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  7. A tightnened glass stopper can be taken out easily by pouring hot wate...

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  8. A long cylindrical metal vessel, having a linear coefficient (alpha), ...

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  9. When hot water is poured on a glass plate, it breaks because of

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  10. Two indentical recrangular strips. One of copper and the other of stee...

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  11. Iron rims are heated red hot before planting on car wheels. Why?

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  12. In riveting boiler plates, red hot rivets are used. Why ?

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  13. A metal ball is heated through a certain temperature. Out of mass, rad...

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  14. A beaker filled with water at 4 .^(@)C over flows if the temperature o...

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  15. A block of wood is floating on water at 0^@C with a certain volume V a...

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  16. Is J a physical quantity ?

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  17. Why is J called a conversion factor?

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  18. When we rub our hands, they are warmed but only to a certain maximum t...

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  19. There is a slight temperature difference between the water fall at the...

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  20. Why do the brake drums of a car get heated, when the car moves down a ...

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