In Class 9 Science, Chapter 1 covers the topic of matter in our surroundings. Important concepts include:
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1. Pressure of air at sea level is -
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2. Sublimation is a process in which -
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3. Choose the correct statement of the following
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4. BEC stands for
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5. Which of the following is not correct for gases ?
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6. During evaporation, particles of a liquid change into vapors only -
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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
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8. During summer, water kept in an earthen pot becomes cool because of the phenomenon of
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9. 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
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10. Which of the following is not an example of matter ?
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11. Dry ice means -
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12. 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
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13. Latent heat of vaporisation of water is -
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14. Which one of the following sets of phenomena would increase on raising the temperature?
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15. The conversion of gas into liquid is called
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.
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.