General Science Class 9 MCQS

Which of the following diagram shows atoms are bonded with same electronegativity?

1. A -----:----- B
2. A ----------: B
3. A :---------- B
4. A --:-------- B

Which of the following gas diffuses fastest?

1. Hydrogen
2. Chlorine
3. Fluorine
4. Helium

The vapour pressure of a liquid increases with the :

1. Increase of pressure
2. Increase of temperature
3. Increase of intermolecular forces
4. Increase the polarity of molecules

The freezing point depends upon :

1. Nature of liquid
2. Pressure
3. Temperature
4. Volume

One atmospheric pressure is equal to :

1. 10325 Pascal
2. 106075 Pascal
3. 10523 Pascal
4. 101325 Pascal

Which of the following does not affect the boiling point?

1. Intermolecular forces
2. External pressure
3. Initial temperature of liquid
4. Nature of liquid

Which of the following have sharp melting point in solids?

1. Plastic
2. Rubber
3. Glass
4. Diamond

Which of the following are lightest form of matter?

1. Solid
2. Liquid
3. Gases
4. Plasma

The liquid molecules leave the surface of liquid in evaporation process because :

1. Energy is low
2. Energy is moderate
3. Energy is high
4. None of these

The density of gases increases when its :

1. Pressure increased
2. Temperature increased
3. Volume increased
4. None of these