Suresh Lecturer

Chapter 1: Matter in Our Surroundings

In Class 9 Science, Chapter 1 covers the topic of matter in our surroundings. Important concepts include:

Types of Matter: Solid, Liquid, and Gas
Properties of Different States of Matter
Relation between Different Temperature Scales
Physical Phenomena: Boiling and Evaporation

To know your total score, click the button at the end of the quiz. No negative marking.

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1. LPG Stands for -

Liquefied petroleum gas

Liquefied pure gas

Least purity gas

Lower pure gas

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2. Which of the following is not correct for gases ?

Gases have definite mass.

Gases have definite shape.

Gases have definite volume

Both (B) and (C)

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3. A few substances are arranged in the increasing order of 'forces of attraction' between their particles. Which one of the following represents a correct arrangement?

Water, air, wind

Air, sugar, oil

Oxygen, water, sugar

Salt, juice, air

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4. On converting 25$\mathrm{{}^\circ}$C, 38$\mathrm{{}^\circ}$C and 66$\mathrm{{}^\circ}$C to kelvin scale, the correct sequence of temperature will be

298 K, 311 K and 339 K

298 K, 300 K and 338 K

273 K, 278 K and 543 K

298 K, 310 K and 338 K

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5. Pressure of air at sea level is -

76 cm of Hg

760 mm of Hg

one atmosphere

All of these

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6. Which state consist of super energetic and super excited particles

BEC

Solid

Gas

Plasma

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7. Rate of evaporation depends upon -

temperature

surface area

humidity

All of these

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8. Which condition out of the following will increase the evaporation of water?

Increase in temperature of water

Decrease in temperature of water

Less exposed surface area of water

Adding common salt to water

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9. Sublimation is a process in which -

solid changes into liquid

liquid changes into gas.

solid changes directly into gas.

None of these

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10. Which out of the following does not make sense.

Solids have fixed shape and fixed volume.

Liquids can be compressed easily, but not gases.

The particles of solids have negligible kinetic energy.

Property of diffusion is maximum in the gaseous state.

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11. The property to flow is unique to fluids. Which one of the following statements is correct?

Only gases behave like fluids

Gases and solids behave like fluids

Gases and liquids behave like fluids

Only liquids are fluids

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12. The boiling point of alcohol is 78 ^oC. What will be the temperature in Kelvin scale ?

373 K

351 K

375 K

78 K

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13. Dry ice means -

solid ammonia

solid carbon dioxide

solid sulphur dioxide

normal ice

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14. Latent heat of vaporisation of water is -

2.25 ×10² J/kg

22.5 × 10⁵ J/kg

3.34 × 10⁵ J/kg

33.4 × 10² J/kg

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15. The intermixing of particles of two different types of matter on their own is called -

Fusion

Diffusion

Vaporisation

Condensation

Important Concepts

1. Types of Matter:
Matter is anything that has mass and occupies space. It can be classified into three main states: solids, liquids, and gases, each with distinct properties.

2. Properties of Matter:
- **Solids:** Have a definite shape and volume. Their particles are tightly packed together.
- **Liquids:** Have a definite volume but take the shape of their container. The particles are close but can move around.
- **Gases:** Have neither definite shape nor volume. Their particles are far apart and move freely.

3. Temperature Scales:
The most commonly used temperature scales are Celsius, Fahrenheit, and Kelvin. Understanding the relationship between these scales is essential in science.

4. Physical Phenomena:
- **Boiling:** The process where a liquid turns into vapor when it reaches its boiling point.
- **Evaporation:** A slower process where molecules at the surface of a liquid gain enough energy to become gas.

Conclusion

The Chapter on Matter in Our Surroundings is fundamental in understanding the nature of various substances and their properties. Completing the quiz will enhance your grasp of these concepts.