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. 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. 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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3. Dry ice means -

solid ammonia

solid carbon dioxide

solid sulphur dioxide

normal ice

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4. 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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5. 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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6. 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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7. 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.

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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. 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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10. Rate of evaporation depends upon -

temperature

surface area

humidity

All of these

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11. Pressure of air at sea level is -

76 cm of Hg

760 mm of Hg

one atmosphere

All of these

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12. One atmosphere is equal to -

1.01 $\mathrm{\times}$ 10⁵Pa

3.46 $\mathrm{\times}$ 10⁴ Pa

1 Pa

10 Pa

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13. BEC stands for

Base Energy Condensate

Bose-Einstein Condensate

Basic Energy Condensate

None of these

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

Fusion

Diffusion

Vaporisation

Condensation

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15. Sublimation is a process in which -

solid changes into liquid

liquid changes into gas.

solid changes directly into gas.

None of these

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.