General Science Class 9 MCQS

_______ are used to put satellites into orbits.

1. Helicopter
2. Aeroplane
3. Rocket
4. None of these

The critical velocity vc = :

1. gR
2. g/R
3. √gR
4. √g/R

The velocity of a satellite is _____ of its mass.

1. Independent
2. Dependent
3. Equal
4. Double

An object with particles close together and vibrating describes a :

1. Gas
2. Liquid
3. Solid
4. All three

A burning candle is an example of ______ state of matter.

1. Gas
2. Liquid
3. Solid
4. All three

During which process a gas becomes a liquid?

1. Melting
2. Freezing
3. Condensing
4. Boiling

A solid can :

1. Have a fixed shape
2. Be easily compressed
3. Take a shape of container
4. Have freely moving molecules

If a gas is heated in a sealed cylinder, then _______ increases.

1. Pressure inside the container
2. Average kinetic energy of the particles
3. Temperature of the gas
4. All of them

A gas in a container of fixed volume is heated. What happens to the molecules of the gas?

1. They collide less frequently
2. They expand
3. They move faster
4. They move further apart

If force of 6N displaces an object 2m in the direction of force, then work done will be :

1. 0
2. 12 Joule
3. 3 Joule
4. Both b and c