1)Pitch is measure of the ____________ of sound.
(a) amplitude (b) wavelength (c) time period (d) frequency
2)A book placed on a shelf can be seen from any part of that room due to _________.
(a) regular reflection
(b) clear reflection
(c) diffused reflection
(d) parallel reflection
3)Two mirrors A and B are placed at right angles to each other. A ray of light incident
on mirror A at an angle of 25° falls on mirror B after reflection. The angle of reflection
for the ray reflected from mirror B would be