Physics Past Questions and Answers

A piece of copper of mass 30g loses 60J of heat energy. If the specific heat capacity of copper is 400J\(kg^{-1}K^{-1}\), Calculate the change in the temperature of the copper

Steel bars each of length 3m at 28°C are to be used for constructing a rail line. If the linear expansitivity of the steel is 1 x \(10^{-5}K^{-1}\),what is the safety gap that must be left between the successive bars if the highest temperature expected is 40°C?

Which of the following explains why a thick glass cup cracks when boiling water is poured into it?

When white light is incident on a glass prism the spectrum produced on a screen placed beyond the prism is due to?

At what distance from a simple microscope must an object be placed so that the image 5 times the size of the object is produced 20cm from the lens?