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. 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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2. 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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3. A gas can be best liquefied -

by lowering the pressure.

by increasing the temperature.

by increasing the pressure and reducing the temperature.

None of these is correct.

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4. 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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5. 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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6. S.I. unit of temperature is -

Celsius

Kelvin

Both

Calori

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7. During summer, water kept in an earthen pot becomes cool because of the phenomenon of

diffusion

transpiration

osmosis

evaporation

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

Air

Feeling of cold

Dust

None of these

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

Fusion

Diffusion

Vaporisation

Condensation

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11. 10. In which of the following conditions, the distance between the molecules of hydrogen gas would increase?
(i) Increasing pressure on hydrogen contained in a closed container
(ii) Some hydrogen gas leaking out of the container
(iii) Increasing the volume of the container of hydrogen gas
(iv) Adding more hydrogen gas to the container without increasing the volume of the container

(i) and (iii)

(i) and (iv)

(ii) and (iii)

(ii) and (iv)

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12. Rate of evaporation depends upon -

temperature

surface area

humidity

All of these

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13. 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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14. BEC stands for

Base Energy Condensate

Bose-Einstein Condensate

Basic Energy Condensate

None of these

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15. One atmosphere is equal to -

1.01 $\mathrm{\times}$ 10⁵Pa

3.46 $\mathrm{\times}$ 10⁴ Pa

1 Pa

10 Pa

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.