Physics MCQs

1) The speed of sound is greatest in

a)    Air

b)   Steel

c)    Ammonia

d)   Water

2) Conditions for interference are that the two sources should be coherent and

a)    At a far off distance

b)   Close together

c)    Coinciding

d)   None of these

3) In YDS experiment, the condition for constructive interference of two coherent waves is that the path difference should be

a)    Integral multiple of ⋋/2

b)   Integral multiple of ⋋

c)    Even integral multiple of ⋋/2

d)   Both b and c

1.B

2.B

3.D