NCERT Books

Exercises I. Short Answer Questions. Question 1.How does noise pollution affect animals ?Answer:Noise from industries, railways, crackers, explosions and commotion in the cities and aircraft, affect animals, birds, mice, fishes and domestic animals. Birds avoid migrating to places where noise level is above 100 dB. The noise emissions caused by supersonic aircraft and railways may […]

Exercises I. Short Answer Questions Question 1.Name any three air pollutants and the sources of each of them.Answer:Pollutant : Carbon Monoxide (CO) : Nitrogen Oxides (NOx) : Sulphur Oxides (SOx) : Sources : Gasoline fuel, motor vehicles fuel, burning of wood and coal, solid waste disposal, Industrial processes. Primary sources are motor vehicles and power […]

Exercises I. Short Answer Questions Question 1.What is environmental pollution ?Answer:Environmental pollution refers to any unfavourable alteration of our surroundings, wholly or largely as a by product of man’s actions. These changes may affect man and other organisms. Question 2.Give the definition of a pollutant.Answer:A pollutant is a product released into the biosphere disturbing the […]

Exercises I. Short Answer Questions. Question 1.Define the following terms : (a) Precipitation(b) Evaporation(c) Condensation(d) Humidity(e) Latent heat. Answer: (a) Precipitation — It is process by which condensation in different forms falling on the ground e.g. rainfall, snowfall, drizzle, sleet and hail etc.(b) Evaporation — It is the process of converting water into water droplets […]

Exercises I. Short Answer Questions. Question 1.Define the following terms : (a) Pressure Gradient(b) Winds(c) Coriolis force.(d) Altitude(e) Monsoons. Answer: (a) Pressure Gradient — It is the rate of change of atmospheric pressure between two points on the earth’s surface.(b) Winds — Horizontal movements of the air from high pressure to low pressure areas are […]

Exercises I. Short Answer Questions. Question 1.What is solar radiation ? What is its significance for the earth ?Answer:The sun continuously radiates heat and light energy in all the directions. It is known as solar radiation. Solar radiation is the only primary source of light and heat on the earth. The earth receives its heat […]

Exercises I. Short Answer Questions. Question 1.What is known as atmosphere ?Answer:The blanket of air upto 1500 km surrounding the earth is known as atmosphere. Question 2. State the gaseous composition of the atmosphere.Answer:The atmosphere consists of 78% Nitrogen 21% oxygen and 1% other gases. Question 3.Mention any three functions of the atmosphere.Answer: Air has […]

Exercises I. Short Answer Questions Question 1.Name the three ways in which movement of ocean water takes place.Answer:Oceanic water movement is affected by the rotation of the earth e.g. earth’s movement from west to east compels water to move from east to west as North and South equatorial current along with a contour equatorial current. […]

Exercises I. Short Answer Questions Question 1.What do you mean by denudation ?Answer:Denudation is the wearing away of landmass by various processes like weathering, erosion mass movement and transportation. It results in lowering the level of land, rounding exposed rock surfaces and levelling the peaks. Question 2. Name important factors which affect work of a […]

Exercises I. Short Answer Questions. Question 1.What is weathering ?Answer:Weathering involves disintegration or decay of solid rock due to change in temperature and weather and their impact on the composition of rock. Question 2.Give one point of difference between physical and chemical weathering.Answer:Physical weathering does disintegration of rock without chemical reaction and the chemical weathering […]