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 state consist of super energetic and super excited particles

BEC

Solid

Gas

Plasma

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2. 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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3. 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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4. The conversion of gas into liquid is called

Sublimation

Fusion

Vaporisation

Condensation

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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. Dry ice means -

solid ammonia

solid carbon dioxide

solid sulphur dioxide

normal ice

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7. 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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8. S.I. unit of temperature is -

Celsius

Kelvin

Both

Calori

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9. Which one of the following sets of phenomena would increase on raising the temperature?

Diffusion, evaporation, compression of gases

Evaporation, compression of gases, solubility

Evaporation, diffusion, expansion of gases

Evaporation, solubility, diffusion, compression of gases

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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. 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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12. 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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13. Which of the following is not an example of matter ?

Air

Feeling of cold

Dust

None of these

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14. 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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15. 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.

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.