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. 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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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. BEC stands for

Base Energy Condensate

Bose-Einstein Condensate

Basic Energy Condensate

None of these

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4. Rate of evaporation depends upon -

temperature

surface area

humidity

All of these

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

Fusion

Diffusion

Vaporisation

Condensation

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6. 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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7. One atmosphere is equal to -

1.01 $\mathrm{\times}$ 10⁵Pa

3.46 $\mathrm{\times}$ 10⁴ Pa

1 Pa

10 Pa

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

BEC

Solid

Gas

Plasma

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9. 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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10. S.I. unit of temperature is -

Celsius

Kelvin

Both

Calori

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

diffusion

transpiration

osmosis

evaporation

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13. 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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14. The conversion of gas into liquid is called

Sublimation

Fusion

Vaporisation

Condensation

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

373 K

351 K

375 K

78 K

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.