MCQs – Matter in Our Surroundings

 Here are 20 Multiple Choice Questions (MCQs) based on the chapter "Matter in Our Surroundings" for Class 9 without answers:

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MCQs – Matter in Our Surroundings

1. Which of the following is not a state of matter?

a) Solid

b) Liquid

c) Gas

d) Energy

2. Which process converts a solid directly into a gas?

a) Evaporation

b) Condensation

c) Sublimation

d) Melting

3. The boiling point of water at sea level is:

a) 90°C

b) 100°C

c) 120°C

d) 80°C

4. Which one of the following has the highest rate of diffusion?

a) Solids

b) Liquids

c) Gases

d) Plasma

5. Which of the following is a sublimable substance?

a) Ice

b) Camphor

c) Sugar

d) Salt

6. Latent heat is the heat energy required for:

a) Increasing temperature

b) Changing state without temperature change

c) Diffusion

d) Conduction

7. What happens to the particles of matter during melting?

a) They lose energy

b) They move closer

c) They gain energy and move apart

d) They become motionless

8. Which state of matter has a definite volume but no definite shape?

a) Solid

b) Liquid

c) Gas

d) Plasma

9. Which phenomenon is used to separate a mixture of salt and ammonium chloride?

a) Evaporation

b) Sublimation

c) Filtration

d) Condensation

10. What is the SI unit of pressure?

a) Pascal

b) Newton

c) Joule

d) Kelvin

11. Which factor does not affect the rate of evaporation?

a) Surface area

b) Wind speed

c) Temperature

d) Pressure

12. Which state of matter has maximum kinetic energy?

a) Solid

b) Liquid

c) Gas

d) Plasma

13. Evaporation causes:

a) Heating

b) Cooling

c) No change in temperature

d) Condensation

14. Intermolecular space is maximum in:

a) Solids

b) Liquids

c) Gases

d) Plasma

15. Which property of liquids makes them take the shape of the container?

a) Compressibility

b) Fluidity

c) Rigidity

d) Elasticity

16. At which temperature does water change from liquid to gas at normal pressure?

a) 90°C

b) 100°C

c) 110°C

d) 80°C

17. Which of the following is an example of diffusion in gases?

a) Mixing of salt in water

b) Smell of perfume spreading

c) Ice melting

d) Formation of dew

18. Which condition will increase the rate of evaporation?

a) High humidity

b) Low temperature

c) High wind speed

d) Small surface area

19. Why does a gas exert pressure on the walls of its container?

a) Due to chemical reactions

b) Due to collisions of particles

c) Due to temperature rise

d) Due to weight of gas

20. Which state of matter can be compressed eas

ily?

a) Solid

b) Liquid

c) Gas

d) Plasma

Here are the answers to the 20 MCQs based on the chapter "Matter in Our Surroundings":

1. d) Energy

2. c) Sublimation

3. b) 100°C

4. c) Gases

5. b) Camphor

6. b) Changing state without temperature change

7. c) They gain energy and move apart

8. b) Liquid

9. b) Sublimation

10. a) Pascal

11. d) Pressure

12. c) Gas

13. b) Cooling

14. c) Gases

15. b) Fluidity

16. b) 100°C

17. b) Smell of perfume spreading

18. c) High wind speed

19. b) Due to collisions of particles

20. c) Gas

Here are 10 MCQs based on temperature conversions between units (Celsius, Fahrenheit, Kelvin):

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1. What is the Celsius equivalent of 273 K?

a) 0°C

b) 100°C

c) -273°C

d) 273°C

2. Convert 0°C to Kelvin:

a) 0 K

b) 100 K

c) 273 K

d) 373 K

3. What is the formula to convert Celsius to Kelvin?

a) K = °C + 273

b) K = °C – 273

c) K = °C × 273

d) K = °C ÷ 273

4. 100°C is equal to how many Kelvin?

a) 100 K

b) 273 K

c) 373 K

d) 0 K

5. What is the Fahrenheit equivalent of 0°C?

a) 32°F

b) 0°F

c) 100°F

d) -32°F

6. Convert 100°C to Fahrenheit:

a) 100°F

b) 212°F

c) 273°F

d) 0°F

7. What is the freezing point of water in Fahrenheit?

a) 0°F

b) 273°F

c) 32°F

d) 100°F

8. Convert 212°F to Celsius:

a) 0°C

b) 100°C

c) 373°C

d) 273°C

9. What is the correct formula to convert Fahrenheit to Celsius?

a) °C = (F – 32) × 5/9

b) °C = F + 273

c) °C = (F + 32) × 5/9

d) °C = (F – 273) × 9/5

10. The boiling point of water is 373 K. What is it in Celsius?

a) 273°C

b) 0°C

c) 100°C

d) 212°C

Here are the answers to the 10 temperature conversion questions:

1. a) 0°C

2. c) 273 K

3. a) K = °C + 273

4. c) 373 K

5. a) 32°F

6. b) 212°F

7. c) 32°F

8. b) 100°C

9. a) °C = (F – 32) × 5/9

10. c) 100°C