Physics Past Questions and Answers

The fig above shows two waveforms X and Y. If the frequency of X is 30Hz what is the frequency of Y

In the fig above, what is the angle of reflection of the ray of light at mirror M?

E,F and G are yellow, red and cyan transparent light filters respectively. The color of a white opaque object when viewed through the arrangement of the filters above is

The wire X in the figure above is at right angles to the plane of the paper and carries a current into the paper. at which of the points labelled 1-4, will the magnetic flux density due to this current be in the same direction as that of the horizontal component of earth's magnetic field

In the circuit diagram above, the ammeter reads a current of 3A when R is 5 ohms and 6A when R is 6 ohms,the value of the unknown resistance X is