InterviewSolution
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InterviewSolution
This section includes InterviewSolutions, each offering curated multiple-choice questions to sharpen your knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
What are the different states in which water is found during the water cycle? |
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Answer» (i) Water vapours in the air which ultimately form clouds, and (ii) Rain water that falls on Earth and is availabel to use in water bodies or as underground water. (iii) Dew, snow, sheetor hail. |
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| 52. |
What are the methods or preventing or reducing soil erosion ? |
| Answer» Soil erosion can be effectively prevented by adopting the following measures, 1. Intensive cropping, 2. Sowing grasses and planting xerophytes, 3. Terrace farming, 4. Proper drainage canals around the fields, 5. Making strong embankments along the river banks, and 6. Checking the overgrazing. | |
| 53. |
Name any three water pollutants. |
| Answer» Sewage, industrial wastes, and fertilizers or pesticides. | |
| 54. |
What is sewage? |
| Answer» Sewage is human waste carried by municipal drains. | |
| 55. |
Name the disease caused by mercury pollution of water. |
| Answer» Minamata disease. | |
| 56. |
Why do people love to fly kites near the sea shore? |
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Answer» (i) There is a regular undirectional wind from the sea to land. It helps in flyig the kite high. (ii) The wind is cooler and provide comfort to kit flyers even in bright sun. |
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| 57. |
Name any one source of emission of carbon monoxide? |
| Answer» Motor vehicles. | |
| 58. |
All the living organisms are basically made up of C,N,S,P,H and O. How they enter the living forms? |
| Answer» Most of these elements first enter plants and become components of organic material during the process of photosynthesis. Thus, they enter from air (`CO_(2)`) water `(H_(2)O)` and ions (N,S,P) from the soil. From plants the chemicals pass on to other organisms through the food chains. | |
| 59. |
What are natural resources? Give their types. |
| Answer» The materials present in natural environment (atmosphere, lithosphere, and hydrosphere) and useful to life form are called natural resources. | |
| 60. |
Name the types of weathering. |
| Answer» There are three types of weathering of rocks: physical, chemical and biological. | |
| 61. |
Why does moon have very cold and very high temperature variations e.g. from `-190^(@)` to `110^(@)C` even though it is at the same distance from the sun as the Earth is? |
| Answer» Atmoshpere of Earth is a bad conductor so acts as a temperature buffer. However, moonlacks an atmosphere around it. Therefore, moon gets heated up as sun rays fall on its surface. It cools down drastically when there is no sunlight, causing wide fluctautions in its temperature. | |
| 62. |
List the chemicals whose biomagnification result in following diseases in humans, (i) Minamata disease, (ii) Itai disease. |
| Answer» Heavy metals, (i) Mercury, (ii) Cadmium. | |
| 63. |
What is smog ? |
| Answer» Smog is opaque dark brown or greyish mist occuring in cold weather reducng visibility and affecting living organisms. | |
| 64. |
During summer,if you go near the lake you feel relief from heat. Why? |
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Answer» During day time, air over the land becomes heated up by sun rays, it rises up and creates area of low pressure. Water of lake is not heated up by sun ray so quickly.Evaporation of water from its surface also cools up the lake water. So,air over the surface of lake is cooler. It moves towards thelnd where low pressure exists. Therefore, during day time a cool breeze from lake to the near by fig. |
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| 65. |
Name an area in India with very poor vegetation. |
| Answer» Parts of Rajasthan (Hot desert) such as Jaiselmer and Dras (cold desert). | |
| 66. |
Name parts of India with maximum diversity. |
| Answer» Western Ghats and north -east India. | |
| 67. |
Which one determines the density and richness of biota? |
| Answer» Availability of water in the form of rainfall. | |
| 68. |
What is air? |
| Answer» Air is a gaseous mixture that occur over the Earth and is breathed by all land plants and animals. | |
| 69. |
What percentage of carbon dioxide is present in the atmoshpere ? |
| Answer» 0.03% or more precisely 0.033% | |
| 70. |
Name the process which causes a long term withdrawal of carbon from carbon cycle? |
| Answer» Formation of carbonate or limestone rocks. | |
| 71. |
What is denitrification? |
| Answer» Denitrification is reduction of nitrates into gaseous nitrogen which escapes from soil into atmosphere. | |
| 72. |
Which of the following processes does (do) return oxygen to the atmosphere ?A. OsmosisB. Burning of petrolC. PhotosynthesisD. Diffusion |
| Answer» Correct Answer - C | |
| 73. |
What are the two forms of oxygen found in the atmosphere? |
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Answer» The two forms of oxygen found in the atmosphere are: (i) Diatomic molecular form with chemical formula `O_(2)`. (ii) Triatomic molecular form with chemical formula `O_(3)` known as ozone. |
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| 74. |
What do you mean by hygroscopic water and combined water in the soil ? Are these available to plants? |
| Answer» Hygroscopic means tendency of absorbing moisture from the air. Some water in the soil forms an extremely thein tightly held film around the soil particles. It is called hygroscoic water In the soil a small portion of soil water is chemically bound with soil materials. It is called combined water. Both of these types of water in the soil are not available to plants for absorption by their roots. | |
| 75. |
Which of the following are involved in the condensation of water vapour leading to the formation of clouds ?A. TemperatureB. Dust particlesC. Carbon dioxideD. Ozone layer |
| Answer» Correct Answer - A::B | |
| 76. |
Why is water essential for life? |
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Answer» Water is essential for life because of the following reasons: (i) Most biological reactions occur when substances are dissolved in water. Thus, all cellular processes need water as a medium to take place. (ii) Transportation of biological substances needs water as a medium. |
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| 77. |
Which forms the nuclei for condensation of water vapours in the atmosphere? |
| Answer» Dust and smoke particles. | |
| 78. |
Why is air called breath of life? Enumerate functions of air or atmosphere. |
| Answer» Air contains oxygen. The latter is needed by most organisms and plants for all respiration to go on. It is therefore, rightly called the breath of life. | |
| 79. |
Define air pollution. |
| Answer» Air pollution is degradation of the quality of air due to addition of natural or human made particulate matter, gases and vaopurs that have an adverse effect on humans, animals and vegetation. | |
| 80. |
Soil erosion can be prevented byA. raising forestsB. deforstationC. excessive use of fertilizerD. overgrazing by animals |
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Answer» Correct Answer - A Roots of trees bind the soil. |
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| 81. |
What happens when rain falls on soil without vegetational cover?A. Rain water percolates in soil effcientlyB. Rain water causes loss of surface soilC. Rain watre leads to fertility of the soilD. Rain water does not cause any change in soil |
| Answer» Correct Answer - B | |
| 82. |
Give two examples of non-renewable resources. |
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Answer» (i) Metallic minerals (ii) Fossil fuels. |
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| 83. |
Define renewable resources? |
| Answer» Renewable natural resources are those which can maintain themselves or can be replaced it managed wisely e.g. water, soil living things such as crops, forests, domestic animals, wildlife. | |
| 84. |
Name one (1) Iinexhaustible resource, (2) Renewable exhaustible resource (3) Non-renewable exhaustible resource |
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Answer» (1) Inexhaustible resource: Air (2) Renewable exhaustible resource: Forests (3) Non renewable exhaustible resource: Fossil fuels. |
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| 85. |
What is the literal meaning of resource? |
| Answer» Means of supplying a material generally held in reserve in called a resource. | |
| 86. |
Define soil. |
| Answer» The top surface layer of Earth (i.e., weathered part of Earth crust) capable of supporting plant life is called soil. | |
| 87. |
Name thre physcial agents which cause weathering of rocks. |
| Answer» (i) Temperature variations, (ii) Rain water, (iii) Wind. | |
| 88. |
What is rain gauge? |
| Answer» Rain gauge is an instrument for measuring the amount of raingall. | |
| 89. |
Lichens are sensitive to which component of air pollution. |
| Answer» Sulphur dioxide. | |
| 90. |
Name the type of water (present in the soil) which can be absorbed by plants. |
| Answer» Capillary water. | |
| 91. |
How is ozone layer useful to us ? |
| Answer» Ozone protects human beings by absorbing harmful UV radiations of sunlight. | |
| 92. |
How are clouds formed? |
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Answer» During day time, on being heated, a large amount of water evaporates from various water bodies and goes into the air. A part of this water vapour also reaches the atmosphere through biological activities such as transpiration and respiration. This causes the air in the atmosphere to heat up. When this heated air rises, it expands and cools, which results in the condensation of water vapour forming water droplets. The presence of dust and other suspended particles in air also facilitates the process of condensation. The formation of water droplets leads to the formation of clouds. |
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| 93. |
Name the common air pollutant which causes depletion of ozone layer. |
| Answer» Chlorofluorocarhons (CFCs). | |
| 94. |
What is terracing? |
| Answer» Terracing is building flat crop fields on the slopes of hills so as to slow down the flow of water and checking soil erosion. | |
| 95. |
What causes winds ? |
| Answer» An uneven heating of the Earth’s surface causes winds. On being heated, air becomes lighter and rises up. As a result, a region of low pressure is created. Then, air from a high pressure region moves to a low pressure region, causing wind. | |
| 96. |
How are winds produced? |
| Answer» The movement of air from one region to another creates winds. When the solar radiations fall on the earth, some are absorbed and majority of these are reflected back or reradiated by the land water bodies. These reflected or raradiated solar radiations heat up the atmosphere from below, As a result, convection currents are set up in the air. But since land gets heated faster than the water, the air above the land gets heated faster than the air over water bodies. During the day, the air over land gets heated faster and starts rising, creating a low pressure below. As a result, the air over the sea moves into this region of low pressure. | |
| 97. |
What causes winds? |
| Answer» The movement of air from one region to another creates winds. When the solar radiations fall on the Earth, some are absorbed and majority of these are refelected back or reradiated by the land and water bodies. These reflected or reradiated solar radiations heat up the atmosphere from below. As a result, covection currents are set up in the air. But since land gets heated faster than the water, the air above the lands gets heated faster than the air over water bodies. During the day, the air above the land gets heated faster and starts risign, creating a region of low pressure below. As a result, the air over the sea moves into this region of low pressure and forms the wind. | |
| 98. |
Ozone layer is getting depleted because ofA. excessive use of automobilesB. excessive formation of industrial units eC. excessive use of man made compounds containing both fluorine and chlorineD. excessive deforstation. |
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Answer» Correct Answer - C These synthetic compounds release chlorine and flurine radicals which combine with ozone layer in the stratosphere and deplete ozone through ozone through chain reactions. |
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| 99. |
What do you mean by global warming? |
| Answer» Global warming is raising the temperature of surface of Earth and nearby atmosphere (due to green house effect). | |
| 100. |
Name the two processes which contribute to soil formation. |
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Answer» (i) Weathering of rocks, (ii) Decomposition of organic matter and subsequent humification and mineralization. |
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