Physics Past Questions and Answers

A body of mass \(200 g\) and specific heat capacity \(0.4\) \(J / g . K\) cools from \(370 C\) to \(310< C >\)
Calculate the quantity of heat released by the body.

The length of mercury thread when it is at \(0 \circ C\), \(1000 C\) and unknown temperature XoC is \(200 mm\), \(220 mm\) and \(270 mm\) respectively. Determine the value of \(X\).

The linear expansivity of a substance is \(1,2 \times 10\) \(4 / K\). A cube of this substance has a volume of \(8.0 \times 103 cm 3\) at \(300< C >\)
Calculate the increase in itsvolumeat \(800 C\)

Which of the following statement about liquid pressure is NOT correct?

A ship traveling towards a cliff receives the echo of its whistle after \(3.5\) seconds. A short while later, it receives the echo after \(2.5\) seconds. If the speed of sound in air under prevailing conditions is \(250 \mathrm{~m} / \mathrm{s}\), how much closer is the ship to the cliff?