91Ó°ÊÓ

A bimetallic strip is formed out of two identical strips, one of copper and other of brass, The coelficicnts of lincar expansion of the two materials are \(\alpha_{c}\) and \(\alpha_{R}\). On heating the temperature of strip goes up by \(A T\) and the strip bends to form an are of radius of curvature \(R\). Then \(R\) is (a) proportional to \(\mathrm{AT}\) (b) inversely proportional to \(\triangle T\) (c) proportional to \(\left|\alpha_{n}-\alpha_{C}\right|\) (d) inversely proportional to \(\left|\alpha_{n}-\alpha_{C}\right|\)

Statement-1: Thermoelectric thermometers can be used to measure quickly changing temperature. Statement- \(2:\) These thermometers have low thermal capacity and high thermal canductivity.

Two vessels of volumes 5 and 3 litres conuin air at pressures of 3 and 7 atmospheres, respectively. What will be the resulant pressurc when they are connccted through a small-bore ubc? \Lambdassume that the temperature remains constant throughout.

A metal ball immersed in water weighs \(W_{1}\) at \(0^{\circ} \mathrm{C}\) and \(W_{2}\) at 50 "C. The coelficient of cubical expansion of the metal is less than that of water. Then (a) \(W_{1}>W_{2}\) (b) \(W_{1}

Find cquation of polytropic process for which heat capacity is \(C=(7 / 2) R\) for a monoatomic gas. (a) \(P V=\) constant (b) \(P V^{2}=\) constant (c) \(P^{2} V=\) constant (d) None