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An iron rod of length 50cm is joined end...

An iron rod of length 50cm is joined end to end to an aluminium rod of length 100cm. All measurements refer to `20^(@)C`. The coefficients of linear expansion of iron and aluminium are `12xx10^(-6)//""^(@)Cand24xx10^(-6)//""^(@)C` respectively. The average coefficient of composite rod is

A

`20xx10^(-6)//""^(@)C`

B

`36xx10^(-6)//""^(@)C`

C

`12xx10^(-6)//""^(@)C`

D

`48xx10^(-6)//""^(@)C`

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-THERMAL PROPERTIES OF MATTER-EXERCISE-3
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  2. Two uniform metal rods of length L(1)andL(2) and their linear coeffici...

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  3. An iron rod of length 50cm is joined end to end to an aluminium rod of...

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  4. A pendulum clock is 5 seconds fast at a temperature of 15^(@)C and 10 ...

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  5. A pendulum clock gives correct time at 20^(@)C at a place where g=10m/...

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  6. A steel meter scale is to be ruled so that millimetre intervals are ac...

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  7. An iron ball of diameter 6cm and is 0.01 mm too large to pass through ...

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  8. Steel rod at 40^(@)C is observed to be 1 m long when measured by a bra...

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  9. A sphere of coefficient of linear expansion alpha, mass 'm' and radius...

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  10. A thin circular metal disc of radius 500mm is set rotating about a cen...

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  11. Two thin metal strips, one of brass and the other of iron are fastened...

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  12. A wire of length L(0) is supplied heat to raise its temperature by T. ...

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  13. A mercury thermometer contains 2c.c. of Hg. At 0^(@)C. Distance betwee...

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  14. Volume of mercury in the bulb of a thermometer is 10^(-6)m^(3). Area o...

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  15. A vessel contains a liquid filled with 1/10th of its volume. Another v...

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  16. coefficient of real expansion of mercury is 0.18xx10^(-3)//""^(@)C. If...

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  17. Density of a liquid at 0^(@)C is 13.6 gm/c.c., and its coefficient of ...

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  18. A glass bulb of volume 250 c.c is completely filled with mercury at 20...

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  19. The densities of wood and benzene at 0^(@)C are 880 kg m^(-3) and 900 ...

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  20. A vertical glass tube, closed at the bottom contains mercury to a heig...

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