Free Ncert Solutions for 9th Class Science Matter in Our Surroundings - Studyadda.com

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9th Science Matter in Our Surroundings

1)

Which of the following are matter ? Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume
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2)

Give reasons for the following observation: The smell of hot sizzling food reaches you several metres away, but to get smell from cold food, you have to go close.
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3)

A diver is able to cut through water in a swimming pool. Which property of matter does this observation show?
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4)

What are the characteristics of the particles of matter?
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5)

The mass per unit volume of a substance is called density. (Density = mass/volume) Arrange the following in order of increasing density - air, exhaust from chimneys, honey, water, chalk, cotton and iron.
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6)

(a) Tabulate the differences in the characteristics of states of matter. (b) Comment upon the following: rigidity, compressibility, fluidity, filling a gas container, shape, kinetic energy and density
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7)

Give reasons. (a) A gas fills completely the vessel in which it is kept. (b) A gas exerts pressure on the walls of the container. (c) A wooden table should be called a solid. (d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.
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8)

Liquids generally have lower density as compared to solids. But you must have observed that ice floats on water. Find out why?
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9)

Convert the following temperatures to celsius scale : (a) 300 K (b) 573 K.
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10)

What is the physical state of water at : (a) 250°C (b) 100°C?
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11)

For any substance, why does the temperature remain constant during the change of state?
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12)

Suggest a method to liquefy atmospheric gases.
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13)

Why does a desert cooler cool better on a hot dry day?
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14)

How does the water kept in an earthen pot (matka) become cool during summer?
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15)

Why does our palm feel cold when we put some acetone or petrol or perfume on it?
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16)

Why are we able to sip hot tea or milk faster from a saucer rather than a cup?
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17)

What type of clothes should we wear in summer?
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18)

Convert the following temperatures to Celsius scale : (a) 293 K (b) 470 K
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19)

Convert the following temperatures to the Kelvin scale : (a) 25°C (b) 373°C
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20)

Give reasons for the following observations : (a) Naphthalene balls disappear with time without leaving any solid. (b) We can get the smell of perfume sitting several metres away.
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21)

Arrange the following substances in increasing order of forces of attraction between the particles: water, sugar, oxygen.
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22)

What is the physical state of water at (a) 25°C (b) 0°C (c) 100°C ?
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23)

Give two reasons to justify that: (a) Water at room temperature is a liquid. (b) An iron almirah is a solid at room temperature.
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24)

Why is ice at 273 K more effective in cooling than water at the same temperature ?
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25)

What produces more severe burns, boiling water or steam ?
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26)

Name A, B, C, D, E and F in the following diagram showing change in its state.
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27) Which one of the following sets of phenomena would increases on raising the temperature? (a) Diffusion, evaporation, compression of gases (b) Evaporation, compression of gases, solubility (c) Evaporation, diffusion, expansion of gases (d) Evaporation, solubility, diffusion, compression of gases
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28) 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. (a) Low temperature, low pressure (b) High temperature, low pressure (c) Low temperature, high pressure (d) High temperature, high pressure
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29) The property to flow is unique to fluids. Which one of the following statements is correct? (a) Only gases behave like fluids (b) Gases and solids behave like fluids (c) Gases and liquids behave like fluids (d) Only liquids are fluids
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30) During summer, water kept in an earthen pot becomes cool because of the phenomenon of (a) diffusion (b) transpiration (c) osmosis (d) evaporation
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31) 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? (a) Water, air, wind (b) Air, sugar, oil (c) Oxygen, water, sugar (d) Salt, juice, air
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32) On converting 25°C, 38°C and 66°C to kelvin scale, the correct sequence of temperature will be (a) 298 K, 311 K and 339 K (b) 298 K, 300 K and 338 K (c) 273 K, 278 K and 543 K (d) 298 K, 310 K and 338 K
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33) Choose the correct statement of the following. (a) Conversion of solid into vapours without passing through the liquid state is called vaporization. (b) Conversion of vapours into solid without passing through the liquid state is called sublimation. (c) Conversion of vapours into solid without passing through the liquid state is called freezing. (d) Conversion of solid into liquid is called sublimation.
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34) The boiling points of diethyl ether, acetone and n-butyl alcohol are 35°C, 56°C and 118°C, respectively. Which one of the following correctly represents their boiling points in kelvin scale? (a) 306 K, 329 K, 391 K (b) 308 K, 329 K, 392 K (c) 308 K, 329 K, 391 K (d) 329 K, 392 K, 308 K
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35) Which condition out of the following will increase the evaporation of water (a) Increase in temperature of water (b) Decrease in temperature of water (c) Less exposed surface area of water (d) Adding common salt to water
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36) 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. (a) (i) and (ii) (b) (i) and (iv) (c) (ii) and (iii) (d) (ii) and (iv)
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37) 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.
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38) 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 would correctly represent the result? Justify your choice.
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39) Fill in the blanks. (a) Evaporation of a liquid at room temperature leads to a........... effect. (b) At room temperature the forces of attraction between the particles of solid substances are?........ than those which exist in the gaseous state. (c) The arrangement of particles is less ordered in the?......... state. However, there is no order in the?......... state. (d) ??........ is the change of gaseous state directly to solid state without going through the?......... state. (e) The phenomenon of change of a liquid into the gaseous state at any temperature below its boiling point is called............... .
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40) Match the physical quantities given in Column A to their SI units given in Column B.

Column A Column B

(a) Pressure 1. Cubic metre

(b) Temperature 2. Kilogram

(c) Density 3. Pascal

(d) Mass 4. Kelvin

(e) Volume 5. Kilogram per cubic metre

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41) The non-SI and SI units of some physical quantities are given in Column A and Column B respectively. Match the units belonging to the same physical quantity.

Column A Column B

(a) Degree Celsius 1. Kilogram

(b) Centimeter 2. Pascal

(c) Gram per centimeter cube 3. Metre

(d) Bar 4. Kelvin

(e) Milligram 5. Kilogram per metre cube

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