Physics Past Questions and Answers

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

\(44 KJ\) of heat was used in raising the temperature of \(2 kg\) of paraffin oil from \(360 K\) to \(370 K\). Calculate the specific heat capacity of paraffin oil

A simple machine overcomes a load of \(4000 N\) when a force of \(200 N\) is applied. If the velocity ration of the machine is 25 , calculate the efficiency of the machine?

A long sighted person is to read a book held at a distance of \(20 cm\) from the eyes. Which of the following will the person require to read the book with ease?

An object at the bottom of a pool of liquid \(10 m\) depth is seen by an observer as if it is at Bm depth. What is the refractive index of the liquid