Revision class 6 - Physics

What is light?

• A form of energy

• A substance

• A gas

• A liquid

Which of the following is the primary source of natural light?

• Moon

• Sun

• Lamp

• Star

What is the speed of light in air?

• 2.6 x 10⁸ m/s

• 3.1 x 10⁹km/h

• 3 x 10⁸m/s

• 3 x 10^-8m/s

Which of the following object does NOT allow light to pass through?

• butter paper

• Water

• wood

• glass

In a pin hole camera the image formed is

(a)  

The intermolecular forces are effective between at all distances between the two molecules

• True

• False

The diameter of a molecule is approximately

• 10 x 10^-10 m

• 1 cm

• 10 m

• 10 x 10^-1 m

A solid exerts pressure (a)  

The molecular motion in liquid and gas is in (a)   path.

The intermolecular forces in liquids are

• as strong as in solids

• stronger than in solids

• weaker than in solids

• weaker than in gases