Physics Past Questions and Answers

The ice and steam points of a mercury-in-glass thermometer of centigrade scale and of uniform bore correspond respectively to \(3 \mathrm{~cm}\) and 19 em lengths of the mercury thread. When the thread is \(12 \mathrm{~cm}\), the temperature is ____________

An electric cell has an internal resistance of 2 ohms, a current of \(0.5 \mathrm{~A}\) is found to flow when \(a\) resistor of 5 ohms resistance is connected across it. What is the electromotive force of the cell?

A uniform beam HK of length \(10 \mathrm{~m}\) and weighing \(200 \mathrm{~N}\) is supported at both ends. A man weighing, \(100 \mathrm{~N}\) stands at a point \(P\) on the beam. if the reactions at \(\mathrm{H}\) and \(\mathrm{K}\) are respectively \(800 \mathrm{~N}\) and \(400 \mathrm{~N}\), then the distance HP is ____________

What are the units of thermal conductivity?

A \(500 \mathrm{~kg}\) car which was initially at rest travelled with an acceleration of \(5 \mathrm{~m} / \mathrm{s}^{2}\), its kinetic energy after 4 seconds was ____________