A metal metre scale gives correct measurement at 0∘C . If is generally used at a temperature of 40∘C .The correction to be made for every metre is ( α=10−6/1∘C )

A steel rular exactly 20 cm long is graguated to give correct measurements at 20^@C . (a) Will it give readings that are too long or too short at lower temperatures? (b) What will be that actual length of the rular when it is used in the desert at a temperature of 40^@ C ? alpha_(steel = 1.2 xx 10^-5(.^@ C)^-1 .

A metallic tape gives correct value at 25^(@)C .A piece of wood is being measured by this metallic tape at 10^(@)C . The reading is 30 cm on the tape, the real length of wooden piece must be

A brass scale gives correct length at 0^(@)C . If the temperature by 25^(@)C and the length read by the scale is 10 cm . Then the actual length will be

A barometer with a brass scale correct at 0^(@)C reads 70 cm of mercury on a day when the air temperature is 40^(@)C . The correct reading at 0^(@)C is (Coefficient of real exapansion of mercury is 0.00018//^(@)C and coefficient of linear expansion of brass is 0.00018//^(@)C)

At room temperature ( 25^@C ) the length of a steel rod is measured using a brass centimetre scale. The measured length is 20 cm. If the scale is calibrated to read accurately at temperature 0^@C , find the actual length of steel rod at room temperature.

The correct value of 0^(@)C on the Kelvin scale is

The correct value of 0^(@)C on the Kelvin scale is

A steel scale is correct at 0^(@)C . The length of a brass tube measured by it at 40^(@)C is 4.5m . The correct length of the tube at 0^(@)C is (Coefficients of linear expansion of steel and brass are 11 xx 10^(-6//@)C and 19 xx 10^(-6//@)C respectively).