Class 9 Exam > Class 9 Notes > Short Answer Questions (1) : Matter In Our Surroundings
Short Answer Questions (1) : Matter In Our Surroundings - Class 9 PDF Download
Matter In Our Surroundings
Exemplar Problem and Solution
Short Answer Type Questions - part-1
Question: -11- A sample of water under study was found to boil at 102°C at normal temperature and pressure. Is the water pure? Will this water freeze at 0°C? Comment.
Answer: The boiling point of pure water is 1000C. Soluble impurities increase the boiling point of a liquid.
As the sample of water boils at 1020C, hence it is not pure.
Impurities does not affect the freezing point, hence the given sample of water will freeze at 00C.
Question: -12- A student heats a beaker containing ice and water. He measures the temperature of the content of the beaker as a function of time. Which of the following (Fig. 1.1) would correctly represent the result? Justify your choice.
Answer – Figure (d) represents the result correctly.
Explanation: Initially temperature of the content of beaker does not rise, because of latent heat of fusion. When all ice melts and, the temperature of content starts rising, hence, figure (d) represents the result correctly.
Question -13. Fill in the blanks:
Question: - (a) Evaporation of a liquid at room temperature leads to a __________ effect.
Answer - Cooling
Question: - (b) At room temperature the forces of attraction between the particles of solid substances are __________ than those which exist in the gaseous state.
Answer - stronger
Question: - (c) The arrangement of particles is less ordered in the _________ state. However, there is no order in the _______ state.
Answer - (a) liquid (b) gaseous
(d) _____________ is the change of gaseous state directly to solid state without going through the _____________ state.
Answer - (a) sublimation (b) liquid
(e) The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called ___________.
Answer - evaporation
Question: -14 - Match the physical quantities given in column A to their S I units given in column B :
Answer
Q - 15 - The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity:
Answer
FAQs on Short Answer Questions (1) : Matter In Our Surroundings - Class 9
| 1. What is matter according to the article "Matter In Our Surroundings" in Class 9? |  |
Ans. Matter is anything that has mass and occupies space. It can be in three states - solid, liquid, and gas.
| 2. What is the boiling point of water? | |
Ans. The boiling point of water is 100 degrees Celsius or 212 degrees Fahrenheit at standard atmospheric pressure.
| 3. What is evaporation? | |
Ans. Evaporation is the process in which a liquid changes into its gaseous state at a temperature below its boiling point.
| 4. What is the difference between a solid and a liquid? | |
Ans. Solids have a definite shape and volume, whereas liquids have a definite volume but no definite shape and take the shape of the container in which they are kept.
| 5. What is the effect of pressure on the state of matter? | |
Ans. Increasing pressure can cause a gas to turn into a liquid or a solid, while decreasing pressure can cause a solid or liquid to turn into a gas.
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