Class 9 Science Matter in our surroundings Fill in the blanks , MCQ , True false and Extra question answers.
Fill in the Blanks
1. Everything in the universe is made up of matter.
2. Matter occupies space and has mass.
3. The ancient Indian concept of matter includes five elements called Panch Tatva.
4. Matter is made up of particles.
5. The particles of matter are very small.
6. The process of mixing of particles of different types of matter is called diffusion.
7. Particles of matter are continuously moving.
8. The force of attraction between particles is strongest in solids.
9. Gases are highly compressible.
10. Solids have a definite shape and volume.
11. Liquids have a definite volume but no definite shape.
12. Gases have neither definite shape nor volume.
13. The process in which a solid changes directly to gas is called sublimation.
14. The temperature at which a solid melts is called its melting point.
Multiple Choice Questions
Particles of matter are:
a) Still
b) Very large
c) Continuously moving
d) Inactive
→ c) Continuously moving
Which state of matter has maximum kinetic energy?
a) Solid
b) Liquid
c) Gas
d) Plasma
→ c) Gas
Matter is classified based on:
a) Volume and mass
b) Physical and chemical properties
c) Shape and texture
d) Color and size
→ b) Physical and chemical properties
The smell of perfume spreads due to:
a) Gravity
b) Conduction
c) Diffusion
d) Convection
→ c) Diffusion
Which of the following has a definite shape and volume?
a) Water
b) Oxygen
c) Iron rod
d) Milk
→ c) Iron rod
Which has minimum space between particles?
a) Solid
b) Liquid
c) Gas
d) Plasma
→ a) Solid
What happens to the particles when a solid is heated?
a) They stop moving
b) They come closer
c) They gain energy and move freely
d) They freeze
→ c) They gain energy and move freely
Conversion of liquid to gas is called:
a) Melting
b) Evaporation
c) Condensation
d) Freezing
→ b) Evaporation
Which of these causes cooling?
a) Melting
b) Freezing
c) Boiling
d) Evaporation
→ d) Evaporation
The temperature at which a liquid boils is called:
a) Freezing point
b) Melting point
c) Boiling point
d) Latent point
→ c) Boiling point
The SI unit of temperature is:
a) Celsius
b) Fahrenheit
c) Kelvin
d) Joule
→ c) Kelvin
Ice at 273 K is more effective in cooling than water at 273 K because:
a) It absorbs more heat
b) It is colder
c) It has latent heat
d) It is more solid
→ c) It has latent heat
Which state of matter has no fixed shape but fixed volume?
a) Solid
b) Liquid
c) Gas
d) Plasma
→ b) Liquid
Which one directly changes from solid to gas?
a) Water
b) Camphor
c) Milk
d) Iron
→ b) Camphor
True/False Statements
1. Matter is made up of continuous blocks. — False
2. Matter occupies space and has mass. — True
3. Solids can be compressed easily. — False
4. Diffusion happens only in gases. — False
5. Particles of matter are always moving. — True
6. Ice is a solid form of water. — True
7. Liquids do not have a definite volume. — False
8. Gases have high compressibility. — True
9. Solids flow like liquids. — False
10. Evaporation causes cooling. — True
11. The melting point of ice is 273.15 K. — True
12. Steam has less energy than water at the same temperature. — False
13. Sublimation is the change from solid to gas without liquid stage. — True
14. Liquids can take the shape of the container they are in. — True
15. The rate of evaporation increases with increase in humidity. — False
Answer the following Questions in Short.
Q: What is the boiling point of water at atmospheric pressure?
A: The boiling point of water at atmospheric pressure is 100°C (or 373 K).
Q: What is sublimation?
A: Sublimation is the process in which a solid changes directly into a gas without passing through the liquid state.
Q: What is evaporation?
A: Evaporation is the process in which a liquid changes into vapour at any temperature below its boiling point.
Q: How do the forces of attraction between particles differ in solids, liquids, and gases?
A: The forces of attraction between particles are maximum in solids, intermediate in liquids, and minimum in gases.
Q: What factors affect the rate of evaporation?
A: The rate of evaporation depends upon the surface area exposed to the atmosphere, the temperature, the humidity, and the wind speed.
Q: What is sublimation?
A: Sublimation is the change of solid state directly to gaseous state without going through liquid state.
