Keeping Time with the Skies — Science STD 8 — Question

State whether the following statements are true or false: The lower the frequency of vibration, the higher is the pitch.

Ciliary muscles changes the shape of the lens in the eye.

There can be a wildlife sanctuary within a blosphere reserve.

If the amplitude of vibration is large, sound is feeble.

State whether the following statements are true or false: When the amplitude of vibrations is halved, the loudness of sound becomes one-fourth.

There is no force between two charged objects placed at a small distance apart.

Insulin is secreted by pituitary gland.

The curvature of a lens affects its focal length.

The law of reflection is not valid for rough surfaces.

The gametes have only one set of chromosomes.