Physics Past Questions and Answers

Which of the following is a pure semiconductor?

The diagram above shows a velocity - time graph. The statement that is true about this motion is that the car

The diagram above represents balls in an undulating surface. Which of the following option represents positions of stable equilibrium?

A bob of weight 0.1 N hangs from a massless string of length 50 cm. A variable horizontal force which increase from zero is applied to pull the bob until the string makes an angle of 60o with the vertical. The work done is

Two metals P and Q of length l<sub style='font-size: smaller;'>1</sub> and l<sub style='font-size: smaller;'>2</sub> are heated through the same temperature difference. If the ratio of the linear expansivities of P to Q is 2:3 and the ratio of lengths is 3:4. What is the ratio of increase in length of P to Q?