Physics Past Questions and Answers

A force of \(16 \mathrm{~N}\) is applied to a \(4.0 \mathrm{~kg}\) block that is at rest on a smooth horizontal surface. What is the velocity of the block at \(t=\) 5 seconds?

The distance travelled by a particle starting from rest is plotted against the square of the time elapsed from the commencement of motion. The resulting graph is linear. The slope of this graph is a measure of

A small needle is carefully floated on water in a beaker. When a few drops of kerosene are introduced into the water, the needle sinks. Which of the following statements correctly explains the observation?

I. There is tension on the water surface II. Kerosene reduces the density of water so that the needle becomes denser than water

III. Kerosene reduces the surface tension of water

Which of the following is a correct explanation of the inertia of a body?

Two masses \(40 \mathrm{~g}\) and \(60 \mathrm{~g}\) are attached firmly to the ends of a light meter rule. The centre of gravity of the system is