PHYSICS CH6 Light — Science STD 9 — Question

Clean and Fresh water is essential for every human activity.

State whether true or false. If false, correct the statement.

Satellites nearer to the Earth should have lesser orbital velocity.

• True

• False

State whether true or false. If false, correct the statement.

The SI unit of electric current is kilogram.

• True

• False

Bats are not blind.

Carbon has the tendency to lose its four electrons with that of other atoms to complete its octet.

Earthworms use the remarkable high-frequency system called echoes.

• True

• False

Setae and parapodia are locomotor organs of earthworms.

Twinkling of stars and Mirage are the two phenomena occurring due to refraction.

State whether true or false. If false, correct the statement.

Vitamins are required in large quantities for normal functioning of the body

• True

• False

Sieve cells have no companion cells.