Do sound waves exhibit diffraction? Give reason to your answer?

Name the wave used in sonar. Give reason to your answer.

Select two pairs from the following which exhibit divergent evolution. Give reasons for your answer. (i) Forelimbs of cheetah and mammals (ii) Wings of butterflies and birds

In which medium the speed of sound is more : humid air or dry air ? Give a reason to your answer.

Will C Cl_4 give white precipitate of AgCl on heating with nitrate? Give reason for your answer

If an elephant and a bull are running with the same speed, which one will have more kinetic energy? Give reasons for your answer

Ranbir claims to have obtained an image twice the size of the object with a concave lens. Is he correct? Give a reason for your answer.

Does sound needs a medium to travel? Give reasons .

In the following figures, which wave has a higher pitch? Give reason for your answer.

A man is standing at a distance of 12 m from a cliff. Will he be able to hear a clear echo of his sound? Give a reason for your answer.