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.

2480

1. BEC stands for

Base Energy Condensate

Bose-Einstein Condensate

Basic Energy Condensate

None of these

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2. Which of the following is not an example of matter ?

Air

Feeling of cold

Dust

None of these

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

BEC

Solid

Gas

Plasma

2471

4. 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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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. LPG Stands for -

Liquefied petroleum gas

Liquefied pure gas

Least purity gas

Lower pure gas

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8. One atmosphere is equal to -

1.01 $\mathrm{\times}$ 10⁵Pa

3.46 $\mathrm{\times}$ 10⁴ Pa

1 Pa

10 Pa

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9. 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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10. 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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11. 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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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. 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

2483

14. .................. is the amount of water vapours present in air.

Humidity

Suspended particles

Pollution

None of these

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15. S.I. unit of temperature is -

Celsius

Kelvin

Both

Calori

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.