Physics Past Questions

Which of the following is NOT a vector quantity

P1 P3 O O3 O2 P2 Fig. 1 Consider the three forces acting at O and in equilibrium as shown in Fig. 1. Which of the following equation is/are CORRECT? I. P1 cos 01 = P1 cos O2 II. P3 = P1 cos O1 + P2 cos O2 III. P1 sin O1 = P2 sin O2

Cord Pull Fig. 2 A brick at rest on a horizontal table is pulled by a horizontal cord, as shown in Fig. 2. The force of friction on the brick

The force with which an object is attracted to the earth is called its

The unit quantity of electricity is called

If the relative density of a metal is 19, what will be the mass of 20cm3 of the metal when immersed in water?

Which of the following statements about liquid pressure is NOT correct? The pressure

A ship traveling towards a cliff receives the echo of its whistle after 3.5 seconds. A short while later, it receives the echo after 2.5 seconds. If the speed of sound in air under the prevailing conditions is 250m s-1, how much closer is the ship to the cliff?

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 produces by two sources of sound because one wave is travelling faster than the other. IV. When two sources of sound of frequencies 500 Hz and 502 Hz are sounded together, a neat frequency of 2 Hz is observed. V. The first harmonic of a note has 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 sort sighted person, distant objects appear blurred. III. Short sight is corrected by using a pair of converging lenses.