CBSE Worksheet for chapter-1 Matter In Our Surrounding class 9

CBSE Worksheet for chapter-1 Matter In Our Surrounding class 9

Worksheet For class 9

Matters in Our Surrounding

Summary

• Definition of matter and substance.
• Physical nature of matter.
• Characteristics of particles of matter.
• Classification of the properties of matter on the basis of physical state.
• Comparison of the properties of solid, liquid, gas.
• Experimental evidence to prove the properties of solid, liquid and gas.
• Diffusion, unit of temperature.
• Change of state of matter by changing temperature and pressure.
• Evaporation and factors affecting evaporation –

1. Temperature.
2. Surface area.
3. Humidity.
4. Wind speed.
5. Molecular composition.

• Fourth and fifth states of matter( Plasma , Bose-Einstein condensate)

SECTION – 1

Q1. Density of gases change with :

1. temperature and volume
2. pressure only
3. temperature only
4. pressure and temperature

Q2. What happens to the volume of the solution when small amount of sugar is dissolved in it ?

1. volume will increase
2. volume will decrease
3. volume first increase then decrease
4. no change in volume

Q3. Which out of the following does not make sense ?

1. Solids have fixed shape and fixed volume.
2. Liquids can be compressed easily, but not gases.
3. The particles of solids have negligible kinetic energy.
4. Property of diffusion is maximum in the gaseous state.

Q4. Which of the following is/are application(s) of high compressibility of gases ?

1. LPG is used as fuel in homes for cooking food.
2. Oxygen cylinders are supplied to hospitals.
3. CNG is used as fuel in vehicles.
4. All of these.

Q5. When a liquid starts boiling , the further heat energy which is supplied –

1. Is lost to the surrounding as such.
2. Increase the temperature of liquid.
3. Increase the kinetic energy of liquid.
4. Is absorbed as latent heat of vaporization by the liquid.

Q6. 10°C temperature is equal to –

1. 163 K
2. 10 K
3. 183 K
4. 283 K

Q7. During evaporation of liquid –

1. The temperature of the liquid falls.
2. The temperature of the liquid rises.
3. The temperature of the liquid remains unchanged.
4. All statements are wrong.

Q8. A gas can be best liquefied –

1. By increasing the temperature.
2. By lowering the pressure.
3. By increasing the pressure and reducing the temperature.
4. None of these is correct.

Q9. Pressure of air at sea level is –

1. One atmosphere
2. 76 cm of Hg
3. 760 mm of Hg
4. All of these

SECTION – 2

Q10. Compound Y has boiling point equal to room temperature. Identify its physical state at room temperature, below & above room temperature.

Q11. What is the difference between a gas and a vapour?

Q12. Why ice at 273K (0ºC) is more effective in cooling than water at the same temperature?

Q13. We can easily move our hand in air but do the same in water with greater effort. Give reason.

Q14. What is latent heat of fusion?

Q15. Explain interconversion of states of matter.

Q16. Distinguish between boiling and evaporation.

Q17. What is the purpose of sipping coffee from a saucer instead of sipping from glass or cup?

Q18. Explain the factors affecting the rate of evaporation.