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.

2448

1. 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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2. Rate of evaporation depends upon -

temperature

surface area

humidity

All of these

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3. 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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4. Which of the following is not an example of matter ?

Air

Feeling of cold

Dust

None of these

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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. One atmosphere is equal to -

1.01 $\mathrm{\times}$ 10⁵Pa

3.46 $\mathrm{\times}$ 10⁴ Pa

1 Pa

10 Pa

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7. On converting 25$\mathrm{{}^\circ}$C, 38$\mathrm{{}^\circ}$C and 66$\mathrm{{}^\circ}$C to kelvin scale, the correct sequence of temperature will be

298 K, 311 K and 339 K

298 K, 300 K and 338 K

273 K, 278 K and 543 K

298 K, 310 K and 338 K

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8. LPG Stands for -

Liquefied petroleum gas

Liquefied pure gas

Least purity gas

Lower pure gas

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

diffusion

transpiration

osmosis

evaporation

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11. 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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12. 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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13. 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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14. 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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15. Which out of the following does not make sense.

Solids have fixed shape and fixed volume.

Liquids can be compressed easily, but not gases.

The particles of solids have negligible kinetic energy.

Property of diffusion is maximum in the gaseous state.

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.