Physics Past Questions and Answers

A uniform cylindrical block of wood floats in water with one-third of its height above the water level, in a liquid of relative density 0.8, what fraction of its height will be above the liquid level?

A thin aluminum plate has a surface area of 1500m<sup style='font-size: smaller;'>[/sup] at 20[sup]o</sup>C. What will be its surface area when it is cooled to -20<sup style='font-size: smaller;'>o</sup>C? (Take the linear expansivity of aluminum to be 2.5 x 10<sup style='font-size: smaller;'>-5</sup>k<sup style='font-size: smaller;'>-1</sup>).

Two liquids, P at a temperature of 20<sup style='font-size: smaller;'>o</sup>C and Q at a temperature of 80<sup style='font-size: smaller;'>o</sup>C have specific heat capacities of 1.0Jkg<sup style='font-size: smaller;'>-1</sup><sup style='font-size: smaller;'>o</sup>C<sup style='font-size: smaller;'>-1</sup> and 1.5J kg<sup style='font-size: smaller;'>-1</sup><sup style='font-size: smaller;'>o</sup>C<sup style='font-size: smaller;'>-1</sup>respectively. if equal masses of P and Q are mixed in a lagged calorimeter, then the equilibrium temperature is

A quantity of gas occupies a certain volume when the temperature is -73<sup style='font-size: smaller;'>o</sup>C and the pressure is 1.5 atmospheres. If the pressure is increased to 4.5 atmospheres and the volume is halved at the same time, what will be the new temperature of the gas?

In a gas experiment, the pressure of the gas is plotted against the reciprocal of the volume of the gas at a constant temperature. the unit of the slope of the resulting curve is