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