waves -mcq-s23 , qp11 12 s22 qp 13

 

the answer is B how 

step 1 - underneath the graph mark 4 points at equal distances

step2 - move the points as per the displacements of A, B ,C and D.

you can see particle at B is at mean position, A to the right ,C to the left.

D at mean position so B is the compression.

the answer is D how 

same method 

step 1 - mark 4 dots at equal distances 

step 2 - particle at B is at mean position , C to the left  A to the right , so B is high pressure 

D is low pressure 

the answer id B how 

frequency is 0.5 hz 

T = 2 s 

so after 2nd quarter of the cycle , P will be at position B., 

In a  transverse, waves particles do not move from one place to another but move up and down about a mean position.