Physics Past Questions and Answers

A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100 ms\(^{-1}\). The recoil speed of the machine gun is

If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of?

In what range of temperature is the expansion of water anomalous?

Which of the following statements about radioactivity is true?
(i) Alpha particle is positively charged
(ii) Beta particle is negatively charged
(iii) Gamma ray is neutral
(iv) Beta particle has the same mass as helium atom
(v) Gamma ray is charged.

In the study of Physics, temperature and heat are often confused with each other. Which of the following statements correctly defines these two elements?