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. 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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2. Pressure of air at sea level is -

76 cm of Hg

760 mm of Hg

one atmosphere

All of these

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3. BEC stands for

Base Energy Condensate

Bose-Einstein Condensate

Basic Energy Condensate

None of these

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

BEC

Solid

Gas

Plasma

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5. 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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6. During evaporation, particles of a liquid change into vapors only -

form the surface.

from the bulk.

from both surface and bulk.

neither from surface nor from bulk.

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7. 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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8. 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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9. Choose the correct statement of the following

conversion of solid into vapours without passing through the liquid state is called sublimation.

conversion of vapours into solid without passing through the liquid state is called vapourisation.

conversion of vapours into solid without passing through the liquid state is called freezing.

conversion of solid into liquid is called sublimation.

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10. One atmosphere is equal to -

1.01 $\mathrm{\times}$ 10⁵Pa

3.46 $\mathrm{\times}$ 10⁴ Pa

1 Pa

10 Pa

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11. The boiling points of diethyl ether, acetone and n-butyl alcohol are 35$\mathrm{{}^\circ}$C, 56$\mathrm{{}^\circ}$C and 118$\mathrm{{}^\circ}$C respectively. Which one of the following correctly represents their boiling points in kelvin scale?

306 K, 329 K, 391 K

308 K, 329 K, 392 K

308 K, 329 K, 391 K

329 K, 392 K, 308 K

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12. Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions

Low temperature, low pressure

High temperature, low pressure

Low temperature, high pressure

High temperature, high pressure

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13. Dry ice means -

solid ammonia

solid carbon dioxide

solid sulphur dioxide

normal ice

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14. Rate of evaporation depends upon -

temperature

surface area

humidity

All of these

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15. LPG Stands for -

Liquefied petroleum gas

Liquefied pure gas

Least purity gas

Lower pure gas

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.