Physics Past Questions and Answers

If the linear expansivity of a metal rod is \(4 \times 10^{-5}\) per \({ }^{\circ} C\), what will be the new length of the rod if it is heated from \(15^{\circ} C\) to \(95^{\circ} C\) from its original length of \(20 cm\)

The heat required to melt ice at \(0^{\circ} C\) to water at the same temperature is called ____________

Which of the following is used in a nuclear reactor to slow down fast moving electrons?

Calculate the power-rating of a heating element which melted in \(20 g\) of ice at \(0^{\circ} C\). and raised the temperature of the resulting water to \(60^{\circ} C\) in 2 minutes Specific latent heat of fusion of ice \(=340 V / g\) Specific heat capacity of water \(=4.2 J / 9^{\circ} C\)

If a man cannot see objects very close to him the following can be used to correct the problem.