Physics Past Questions and Answers

which of the following is NOT correct? i. the pitch of a sound note depends on the frequency of vibrations. ii. the intensity of a sound note is proportional to the amplitude of vibrations. iii. beats are produced by two sources of sound because one wave is travelling faster than the other. iv. when two sources of sound of frequencies 500Hz and 502Hz are sounded together, a beat frequency of 2Hz is observed. v. the first harmonic of a tone have double the frequency of the fundamental note.

Which of the following statements about defects of vision is/are CORRECT? i. for a long sighted person, close objects appear blurred. ii. for a short sighted person, distant objects appear blurred. iii. short sight is corrected by using a pair of converging lenses.

The range of wavelengths of the visible spectrum is 400nm - 700nm. The wavelength of gamma rays is

If the pressure on 100cm<sup style='font-size: smaller;'>3</sup> of an ideal gas is doubled while its kelvin temperature is halved, then the new volume of the gas will become

A train has an initial velocity of 44ms<sup style='font-size: smaller;'>-1</sup> and an acceleration of -4ms<sup style='font-size: smaller;'>-1</sup>. Its velocity after 10 seconds is