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(A) : Steel rods are used in R.C.C. ( ...

(A) : Steel rods are used in R.C.C.
( R) : Both steel and R.C.C. have almost same values of coefficient of linear expansion.

A

Both (A) and (R) are true and (R) is the correct explanation of (A)

B

Both (A) and (R) are true and (R) is not the correct explanation of (A)

C

(A) is true but (R) is false

D

Both (A) and (R) are false

Text Solution

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The correct Answer is:
A
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A thin brass sheet at 10^(@)C and a thin stell sheet at 20^(@)C have the same surface area. The common temperature at which both would have the same area is (coefficient of liner expansion for brass and steel are respectively 19xx10^(-6//@)C and 11xx10^(-6//@)C) .

Railway lines are laid with gaps to allow for expansion. If the gap between the steel rails 66 m long be 3.63 cm at 10^(@) C . Then the temperature at which the lines touch (coefficient of linear expansion for steel = 11 xx 10^(-6)^(@) C^(-1) ) is

What should be the lengths of steel and copper rod so that the length of steel rod is 10 cm longer than the copper rod at all the temperatures. Coefficients of linear expansion for copper and steel are alpha_(Cu)=1.7xx10^(-5)""^(@)C^(-1)andalpha_("steel")=1.1xx10^(-5)""^(@)C^(-1)

A meter scale made of steel , reads accirately at 25 ^(@) C Suppose in an experiment an accuracy of 0.06 mm in 1 m is required , the range of temperature in which the experiment can be performed with this meter scale is ( Coefficient of linear expansion of steel is 11xx10 ^(-6) // ""^(@) C )

A steel tape Im long is correctly calibrated for a temperature of 27.0 ^(@) C . The length of a steel rod measured by this tape is found to be 63.0 cm on a hot day when the temperature is 45.0^(@) C .What is the actual length of the steel rod on that day? What is the length of the same steel rod on a day when the temperature is 27.0^(@) C ? Coefficient of linear expansion of steel = 1.20 xx 10^(-5) K^(-1) .

AAKASH SERIES-THERMAL PROPERTIES OF MATTER-EXERCISE-IB
  1. (A) : Metals are isotropic solids ( R) : Metals are composed of larg...

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  2. (A) : When a circular disc with a hole is heated, the diameter of the ...

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  3. (A) : Steel rods are used in R.C.C. ( R) : Both steel and R.C.C. hav...

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  4. (A) : When a Bimetalic strip made up of Brass and Iron is heated then ...

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  5. (A) : Invar is used in metal tapes, balance wheels and pendulum clocks...

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  6. (A) : A brass disc fits snugly in the hole of the iron plate. To remov...

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  7. (A) : In summer, the pendulum clock runs slow. ( R) : As temperature...

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  8. (A) : A tightly closed metal lid of a glass bottle can be opened more ...

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  9. (A) : A man would feel iron or wooden balls equally hot at 98.4^(@)F. ...

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  10. (A) : Fahrenheit is the smallest unit in the measurement of temperatur...

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  11. (A) : Solids expand on heating. ( R) : Potential energy of the atoms...

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  12. (A) : Solids expand on heating. ( R) : Atoms of the solid are an har...

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  13. (A) : Thermal expansion of solids is due to the anharmonicity of the l...

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  14. (A) : In laying down a railway track a small gap is left between the e...

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  15. (A) : Some times water pipes burst in severe winter. ( R) : On freez...

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  16. (A) : When a strip made of iron and copper is heated it bends with iro...

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  17. (A) : Reading of temperature may be same on Fahrenheit and Kelvin scal...

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  18. (A) : Two bodies at the same temperature may contain different amount ...

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  19. (A) : A clinical thermometer is usually much shorter than a laboratory...

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  20. (A) : A hollow bottle retains its shape when heated. ( R) : When hol...

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