A Metallic Ball Has Spherical Cavity At Its Centre. If The Ball Is Heated, What Happens To The Cavity?

Two straight metallic strips each of thickness t and length L are rivetted together. Their coefficients of linear expansions are   If they are heated through temperature , the bimetallic strip will bend to form an arc of radius:

A pendulum clock is 5 sec fast at temperature of 15^oC and 10 seconds slow at a temperature of 30^oC. At what temperature does it give the correct time?

A thermometer is graduated in millimeters. It registers – 3 mm when the bulb of thermometer is in pure melting ice and 22 mm when the thermometer is in steam at a pressure of 1 atmosphere. The temperature in ^oC when the thermometer registers 13 mm is:

The resistance of a resistance thermometer has values 2.71 and 3.70 ohm at 10^oC and 100^oC. The temperature at which the resistance is 3.26 ohm is:

The standard fixed point for temperature measurements in use today is:

A test tube containing water is placed in boiling water so that its mouth remains outside the boiling water. Choose the wrong statement:

What extinguishes a fire most quickly?

A 10 kg iron bar (specific heat 0.11 cal/gm-^oC) at 80^oC is placed on a block of ice. How much ice melts?

A vertical glass jar is filled with water at 10^oC. It has one thermometer at the top and another at the bottom. The central region of the jar is gradually cooled. It is found that the bottom thermometer reads 4^oC earlier than the top thermometers and the top thermometer reads 0^oC earlier than the bottom thermometer. This happens because:

A thin copper wire of length L increase in length by 1% when heated from 0^oC to 100^oC. If a thin copper plate of area  is heated from 0^oC to 100^oC, the percentage increase in its area will be: