Matter In Our Sourroundings (Solved)
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Q. 61. Which is not a matter :
Air, water, sky, fire, security, force, work.
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Q. 62. Which of the following are matter :
Chair, air, love, smell, hate, almonds, thought, cold drinks, smell of perfumes.
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Q. 63. How will you show that matter is composed of particles.
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Q. 64. Show experimentally that particles of matter have space between them ?
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Q. 65. What happens when a crystal of potassium permanganate is dropped in a beaker half filled with water ? Explain.
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Q. 66. Prove experimentally that particles of matter are very very small.
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Q. 67. Which property of gases help us in detecting the leakage of LPG gas ?
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Q. 68. Give an example of each
(i) a liquid diffusing into solid
(ii) a solid diffusing into liquid and
(iii) a solid diffusing into solid
(iv) a liquid diffuses into liquid.
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Q. 69. What happens when we drop a crystal of potassium permanganate into a beaker containing hot water and another one containing cold water.
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Q. 70. How will you prove that there is force of attraction between particles of matter ?
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Q. 71. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show ?
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Q. 72. What are the characteristics of the particles of matter ?
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Q. 73. Why gases can be compressed but liquids not ?
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Q.74. State our body parts in three states of matter.
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Q. 75. The particles in liquids are held together less firmly than solids. Why ?
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Q. 76. Solids and liquids have open surface while gases do not have open surface. Explain.
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Q. 77. Liquids and gases are called fluids. Why ?
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Q. 78. Which one important characteristic of matter makes it a solid, a liquid or a gas ?
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Q. 79. Give reason for the following :
(i) Solids have fixed shape but rubber band being solid can change its shape.
(ii) Solids are incompressible but sponge being solid can be compressed.
(iii) Solids are rigid but a heap of rubber materials can be drawn into any shape.
(iv) Mud is a solid but it can be cast into any shape.
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Q. 80. Giving example explain how the rate of diffusion changes with
(i) density of liquid and
(ii) temperature.
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Q. 81. Classify the following into different states of matter :
Glass, chair, rubber, nitrogen, water, petroleum, oxygen, heat, work, power, honey.
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Q. 82. Classify the materials given below according to the state in which they exist :
Kerosene, steel, LPG, honey, air, blood, CNG, oil, rubber, carbon dioxide, glass, nitrogen, oxygen, water.
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Q. 83. Arrange the following in increasing order of intermolecular forces between the molecules of :
Hydrogen, salt, petroleum.
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Q. 84. A glass rod is easily moved through water in a beaker but not through chips of stone. Why ?
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Q. 85. Define pressure and give its unit. State the factors on which the pressure of liquids depend.
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Q. 86. There are three vessels of volumes 1.5 liters, 2 liters and 2.5 liters. 10 g nitrogen gas is filled in each of the vessels. What will be the volumes in each vessel ?
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Q. 87. Why gaseous state of ammonia is not regarded as vapours.
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Q. 88. 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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Q. 89. Comment upon the following :
rigidity, compressibility, fluidity, filing a gas container, shape, kinetic energy and density.
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Q. 90. 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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