When a rod is heated from `25^(@)C` to `75^(@)C`, it expands by `1 mm`. When a rod of same materlal but with `4` times the length is heated from `25^(@)C` to `50^(@)C`. The increase in length is

A rod, when heated from 0^(@)C to 50^(@)C , expands by 1.0 mm. Another rod, twice as long as the first at 0^(@)C and of the same material, is heated from 0^(@)C to 25^(@)C . The second rod will expand by …………….. .

When a gas is heated from 25^(@)C " to " 50^(@)C at constant pressure of 1 bar, its volume :

5 moles of an ideal monoatomic gas absorbes x joule when heated from 25^(@) C to 30^(@) C at a constant volume. The amount of heat absorbed when 2 moles of the same gas is heated from 25^(@) C to 30^(@) C at constant pressure, is :

A thin copper wire of length l increases in length by 1% when heated from 0^(@)C " to " 100^(@)C . If a thin copper plate of area 2l times l is heated from 0^(@)C " to " 100^(@)C , find the percentage increase in its area.

A rod of length 50 cm is made of metal A and elongates by 0.2 cm when it is heated from 0^@C to 100^@C . Another rod made of metal B is of length 60 cm and elongates by 0.18 cm when heated from 0^@C to 100^@C . A composite rod of length 80 cm is made by welding pieces of rods A and B, placed end to end. When metal C is heated from 0^@C to 50^@C , it gets elongated by 0.08 cm. The length of the rod of metal A in the composite rod is

Assertion : When water is heated from 25^(@)C" to "50^(@)C , its pH increases Reason : The ionic product of water (Kw) increases with increase in temperature.