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.

2470

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

373 K

351 K

375 K

78 K

2477

2. One atmosphere is equal to -

1.01 $\mathrm{\times}$ 10⁵Pa

3.46 $\mathrm{\times}$ 10⁴ Pa

1 Pa

10 Pa

2449

3. 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

2478

4. Pressure of air at sea level is -

76 cm of Hg

760 mm of Hg

one atmosphere

All of these

2472

5. S.I. unit of temperature is -

Celsius

Kelvin

Both

Calori

2467

6. 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)

2481

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

BEC

Solid

Gas

Plasma

2484

8. LPG Stands for -

Liquefied petroleum gas

Liquefied pure gas

Least purity gas

Lower pure gas

2479

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.

2445

10. 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

2447

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

diffusion

transpiration

osmosis

evaporation

2476

12. Rate of evaporation depends upon -

temperature

surface area

humidity

All of these

2469

13. 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.

2474

14. Dry ice means -

solid ammonia

solid carbon dioxide

solid sulphur dioxide

normal ice

2485

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

Fusion

Diffusion

Vaporisation

Condensation

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.