Recent questions tagged environmental-studies

Description : Besides earth, there are ……………. other planets which revolves around the sun. (a) two (b) one (c) seven

Last Answer : (c) seven

Description : The earth’s movement around the sun is called the ………………. of the earth. (a) revolution (b) rotation (c) motion

Last Answer : (a) revolution

Description : Our earth is a ………………….. . (a) satellite (b) moon (c) planet

Last Answer : (c) planet

Description : Plants get their light from the …………………… . (a) rockets (b) asteroids (c) stars (d) sun

Last Answer : (c) stars

Description : ………………… do not have their own light. (a) stars (b) planets (c) bulbs

Last Answer : (b) planets

Description : The heavenly bodies that do not twinkle are called ………………. . (a) planets (b) stars (c) rockets

Last Answer : (a) planets

Description : The Sun is a …………………. . (a) planet (b) star (c) satellite

Last Answer : (b) star

Description : ………………….. have their own light. (a) Stars (b) Planets (c) Asteroids

Last Answer : (a) Stars

Description : …………………. became the first Indian astonaut to go in space. (a) Kalpana Chaivla (b) Rakesh Sharma (c) Sunita Williams

Last Answer : (b) Rakesh Sharma

Description : Scientists who travel in the spacecraft are called ……………….. . (a) astronauts (b) researchers (c) engineers

Last Answer : (a) astronauts

Description : …………………….. is an important Indian space mission on Mars. (a) Chandrayaan -1 (b) Mangalyaan (c) Marsyaan

Last Answer : (b) Mangalyaan

Description : The heavenly body closest to the earth is ………………. . (a) sun (b) moon (c) mercury

Last Answer : (b) moon

Description : Satellites and planets get their light from the ……………….. . (a) asteroids (b) pluto (c) sun

Last Answer : (c) sun

Description : The heavenly bodies that twinkle are called ……………………. . (a) earth (b) moon (c) stars

Last Answer : (c) Stars

Description : What information do man-made satellites provide?

Last Answer : 1. Man made satellites provide useful information on agriculture, environment, weather, forecasting, making maps and searching for water and mineral wealth on the earth. 2. It is also used for telecommunication.

Description : For what purpose are rockets used in space travel?

Last Answer : 1. Very powerful rockets are used to send a spacecraft into space. 2. A tremendous quantity of fuel is burnt in rockets so that spacecraft weighing thousands of tons may be launched into space.

Description : I am the nearest star to the earth.

Last Answer : The sun.

Description : No other planet has a living world like mine.

Last Answer : Earth.

Description : I turn around myself and revolve around the Sun.

Last Answer : Planet.

Description : I turn around myself, around a planet and also around a star.

Last Answer : Satellite.

Description : I have my own light. It is only from me that the planets get light and heat.

Last Answer : The sun.

Description : You can see me from the earth but the lighted part of me that you see changes every day.

Last Answer : The moon.

Description : Which planet in the Solar System is furthest from the sun?

Last Answer : Neptune

Description : Name the planets beyond the orbit of Mars in serial order.

Last Answer : Jupiter, Saturn, Uranus and Neptune.

Description : Which planet is placed between the earth and mercury?

Last Answer : Venus

Description : At what position is the earth from the Sun?

Last Answer : Third

Description : Which planet is nearest to the Sun?

Last Answer : Mercury

Description : What will happen to our solar system if the sun were to suddenly disappear?

Last Answer : 1. If the sun were to suddenly disappear all life forms on earth will cease, because the sun is a source of light and heat. 2. There will be complete darkness on all planets. 3. The planets will move from their orbits and may clash against each other.

Description : One of the asteroids have fallen out of its place in the asteroid belt and is hurling towards the sun. Our earth is in its way and there is all likelihood of a collision. What can be done to prevent this collision?

Last Answer : Use the shock wave to deflect it away from earth. Which means attach three large remote controlled rockets to the asteroid turning it into a large space vehicle and move it away from a dangerous collision.

Description : For a continuous flow type of sedimentation tanks A. Width of the tank is normally kept about 6 m B. Length of the tank is normally kept 4 to 5 times the width C. Maximum horizontal flow velocity is limited to 0.3 m/minute D. All the above

Last Answer : D

Description : What is the important feature of shifting cultivation? —

Last Answer : Change of cultivation site

Description : Conserve Water

Last Answer : ⮚ Do not keep water taps running while brushing, shaving, washing or bathing. ⮚ In washing machines fill the machine only to the level required for your clothes. ⮚ Install water-saving toilets that ... ⮚ Build rain water harvesting system in your house. Even the President of India is doing this.

Description : Environmental impact:

Last Answer : Nuclear fission power reactors generate large quantities of radioactive fission waste products, which may remain dangerous for thousands of years. In addition these are no safe disposal methods. It is ... fusion (combining the small nucleus) of the atoms of certain elements such as Uranium-235

Description : Nuclear fission:

Last Answer : Nuclear fission reaction are based on the fission of U235 nuclei by thermal neutrons

Description : NUCLEAR ENERGY

Last Answer : Nuclear energy is non- renewable source of energy, which is released during fission (disintegration) or fusion (union) of selected radioactive materials. Nuclear power appears to be ... in the generation of electricity in spaceships, marine vessels, chemical and food-processing industry.

Description : Bio-mass Energy

Last Answer : ⮚ Bio-mass is the organic matter produced by the plants or animals which include wood, crop residues, cattle dung, manure, sewage ⮚ The bio-mass is directly used as a fuel but the efficiency of ... air pollution ⮚ It is therefore more useful to convert the bio-mass into bio-gas or bio-fuels

Description : Tidal Energy

Last Answer : ⮚ Ocean tides are produced by gravitational forces of sun and moon, and contain enormous amount of energy. ⮚ The tidal energy can be harnesses by constructing tidal barrage

Description : Salinity Problems

Last Answer : ⮚ At present ⅓rd of the total cultivable land area of the world is affected by salts ⮚ In India about 7 million Hectares of land are estimated to be salt affected ⮚ Saline soils ... soils. Another method is laying underground network of perforated drainage pipes for flushing out the salts slowly

Description : Water logging

Last Answer : ⮚ Over irrigation of croplands by farmers for good growth of their crop usually leads to water logging ⮚ Inadequate drainage causes excess water to accumulate underground and gradually forms a ... bio-drainage with trees like Eucalyptus are some of the remedial measures to prevent water logging

Description : Biological magnification

Last Answer : Many of the pesticides are not biodegradable and keep on accumulating in the food chain, this process is called as bio-magnification

Description : Death of non-target organisms

Last Answer : Many insecticides are broad spectrum poisons which not only kill the target species but also several non-target species which are useful to us

Description : Creating resistance in pests and producing new pests

Last Answer : Some individuals of the pest species usually survive even after pesticide spray The survivors give rise to highly resistant generations About 20 species of pests are now known which have become immune to all types of pesticides an are known as ―super pests‖

Description : Eutrophication

Last Answer : Eutrophication means Over Nourishment Due to Eutrophication lakes get invaded by algal blooms; these algae grows very fast by rapidly using up the nutrients, they often are toxic and badly affect the food chain

Description : Nitrate Pollution

Last Answer : Nitrogenous fertilizers applied in the fields often leach deep into soil and ultimately contaminate the ground water The nitrates get concentrated in the water and when their concentration exceeds 25 mg/L, they become the cause of a serious health hazard called ―Blue Baby syndrome‖

Description : Micronutrient Imbalance

Last Answer : Most of the chemical fertilizers used in modern agriculture have nitrogen, phosphorus and potassium which are essential macronutrients Farmers use these indiscriminately to boost up crop growth.

Description : MODERN AGRICULTURE AND ITS IMPACTS

Last Answer : ⮚ It makes use of hybrid seeds of selected single crop variety, high-tech equipments and lots of energy subsidies in the form of fertilizers, pesticides and irrigation water ⮚ The food production has increased tremendously, evidenced by the ―green revolution‖

Description : Loss of useful species

Last Answer : ⮚ Overgrazing adversely affects the composition of plant population and their regeneration capacity ⮚ The original grassland consists of good quality grasses and forbs with high nutritive value ⮚ Heavy ... by secondary species ⮚ The secondary species are hardier and are less nutritive in nature

Description : Soil Erosion

Last Answer : ✔ Due to overgrazing by cattle, the cover of vegetation almost gets removed from the land ✔ The soil becomes exposed and gets eroded by the action of strong wind, rainfall etc ✔ The grass roots ... When the grasses are removed, the soil becomes loose and susceptible to the action of wind and water

Description : Land Degradation

Last Answer : ✔ Overgrazing removes the vegetal cover over the soil and the exposed soil gets compacted due to which the operative soil depth declines ⮚ Roots cannot go deep into the soil ... overgrazing leads to multiple actions resulting in loss of soil structure, hydraulic conductivity and soil fertility

Description : Discuss in detail the impacts of over-grazing & agriculture.

Last Answer : Overgrazing: Livestock wealth plays a crucial role in the rural life of our country. The live stock grazing on a particular piece of grassland is called as Overgrazing. Overgrazing is a process ... regenerate". Impact of Overgrazeing: Land Degradation, Soil Erosion, Loss of useful species,