McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: General Knowledge (GK) , Union Public Service Commission (UPSC) .
| 351. |
Which of the following refers to the white salt which covers the land in some areas during dry season? |
| A. | usar |
| B. | reh |
| C. | erg |
| D. | reg |
| Answer» B. reh | |
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Explanation: Reh refers to a mixture of soluble sodium salts appearing as efflorescence on theground in arid or semiarid regions in India. It covers the land in the form of a white layer. It is also known as Kallar. |
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| 352. |
If speed of rotation of the earth increases, the weight of the body – |
| A. | decreases |
| B. | increases |
| C. | remains the same |
| D. | may increase or decrease |
| Answer» A. decreases | |
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Explanation: The weight of a body on the earth is the amount of gravitational pull on it exerted by the earth. Similarly there is another force exerted on a body on earth, that is centrifugal force due to its rotation which tries to move the body away from the centre of the earth and its maximum at the equator as the velocity of rotation is maximum at the equator of the earth. The gravitational force is balanced by the centrifugal force. With the increase in the speed of rotation of the earth the body at the equator will come more under the influence of the centrifugal force and the weight of the body will seem to have decreased. |
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| 353. |
The land forms formed by wave erosion is : |
| A. | Spit |
| B. | Beach |
| C. | Cave |
| D. | Barrier island |
| Answer» C. Cave | |
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Explanation: Cliffs, caves, arches, stacks are some of the landforms produced by wave erosion. Coves form where rock runs in bands horizontal to the direction of wave attack. There is a band of resistant rock closest to the sea and a band of less resistant rock inland. The waves seek out faults in the hard rock and erodes using the processes of abrasion/corrosion and hydraulic action through to the soft rock behind. |
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| 354. |
In a solar or lunar eclipse, the region of earth's shadow is divided into – |
| A. | Five parts |
| B. | Four parts |
| C. | Two parts |
| D. | Three parts |
| Answer» D. Three parts | |
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Explanation: An eclipse occurs when a star (such as Sun) aligns with two celestial bodies, such as a planet and a moon. The closer body casts a shadow that intersects the more distant body. This means that "things get dark." The region of shadow is divided into an umbra, where the light from the star is completely blocked, and a penumbra, where only a portion of the light is blocked. Beyond the end of the umbra is a region called the antumbra. For an observer inside the antumbra of a solar eclipse, for example, the moon appears smaller than the sun, resulting in an annular eclipse. |
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| 355. |
Rift Valley is formed – |
| A. | between two anticlines |
| B. | between two faults |
| C. | erosion of synclinal basin |
| D. | due to volcanic eruption |
| Answer» B. between two faults | |
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Explanation: A rift valley is a linear-shaped lowland between several highlands or mountain ranges created by the action of a geologic rift or fault. It is formed by the subsidence of a segment of the Earth's crust between dip-slip, or normal, faults. |
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| 356. |
Mounds of sand formed by wind action are called |
| A. | Cliffs |
| B. | Cirques |
| C. | Dunes |
| D. | Hamadas |
| Answer» C. Dunes | |
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Explanation: Cliff is a high and extremely steep rock face that approaches the vertical, either inland or along a coastline. Cirque refers to a deep rounded hollow having steep sides, formed through erosion by snow and ice. Dune is a hill or ridge of sand accumulated and sorted by wind action. |
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| 357. |
The rate of deforestation is high in – |
| A. | Tropical zone |
| B. | Desert areas |
| C. | Temperate zone |
| D. | Boreal forest |
| Answer» C. Temperate zone | |
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Explanation: The rate of deforestation is high in Temperate Zone. |
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| 358. |
One of the following is not the result of underground water action – |
| A. | Stalactites |
| B. | Stalagmites |
| C. | Sink holes |
| D. | Fiords |
| Answer» D. Fiords | |
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Explanation: Geologically, a fjord is a long, narrow inlet with steep sides or cliffs, created in a valley carved by glacial activity. A fjord is formed when a glacier cuts a U-shaped valley by ice segregation and abrasion of the surrounding bedrock. Glacial melting is accompanied by rebound of Earth's crust as the ice load and eroded sediment is removed. Both the whole coast of Norway and the island of Greenland have many fjords. |
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| 359. |
The inner-most layer of the earth is known as – |
| A. | Lithosphere |
| B. | Mesosphere |
| C. | Asthenosphere |
| D. | Barysphere |
| Answer» C. Asthenosphere | |
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Explanation: The inner core is the innermost physical layer of the Earth. The asthenosphere is the highly viscous, mechanically weak and ductilely-deforming region of the upper mantle of the Earth. It lies below the lithosphere, at depths between 100 and 200 km below the surface, but perhaps extending as deep as 700 km. |
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| 360. |
The 'Pacific Ring of Fire' is associated with – |
| A. | oil well fires |
| B. | thermal power station |
| C. | volcanoes and earthquakes |
| D. | forest fires |
| Answer» C. volcanoes and earthquakes | |
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Explanation: The Pacific Ring of Fire is an area where a large number of earthquakes and volcanic eruptions occur in the basin of the Pacific Ocean. In a 40,000 km horseshoe shape, it is associated with a nearly continuous series of oceanic trenches, volcanic arcs, and volcanic belts and/or plate movements. The Ring of Fire has 452 volcanoes and is home to over 75% of the world's active and dormant volcanoes. It is sometimes called the circum-Pacific belt or the circum-Pacific seismic belt. About 90% of the world's earthquakes and 81% of the world's largest earthquakes occur along the Ring of Fire. |
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| 361. |
Metamorphic rocks originate from— |
| A. | igneous rocks |
| B. | sedimentary rocks |
| C. | both igneous and sedimentary rocks |
| D. | None of these |
| Answer» C. both igneous and sedimentary rocks | |
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Explanation: Metamorphic rocks are rocks that have "morphed" into another kind of rock. These rocks were once igneous or sedimentary rocks. How do sedimentary and igneous rocks change? The rocks are under tons and tons of pressure, which fosters heat build-up, and this causes them to change. If you exam metamorphic rock samples closely, you'll discover how flattened some of the grains in the rock are. |
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| 362. |
The term 'epicentre' is associated with— |
| A. | earthquake |
| B. | folding |
| C. | faulting |
| D. | earth's interior |
| Answer» A. earthquake | |
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Explanation: The epicenter is the point on the Earth's surface that is directly above the hypocenter or focus, the point where anearthquake or underground explosion originates. In the case of earthquakes, the epicenter is directly above the point where the fault begins to rupture, and in most cases, it is the area of greatest damage. However, in larger events, the length of the fault rupture is much longer, and damage can be spread across the rupture zone. |
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| 363. |
Our atmosphere is divided into layers. |
| A. | Two |
| B. | Three |
| C. | Four |
| D. | Five |
| Answer» D. Five | |
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Explanation: Earth has five primary layers, which are the troposphere, stratosphere, mesosphere, thermosphere and exosphere. From the Earth upwards, those layers are: Troposphere: 0 to 12 km: Stratosphere: 12 to 50 km; Mesosphere: 50 to 80 km; Thermosphere:80. to 700 km; Exosphere: 700 to 10,000 km. |
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| 364. |
The forests which act as barriers against cyclones are : |
| A. | Alpine forests |
| B. | Mangrove forests |
| C. | Evergreen forests |
| D. | Monsoon forests |
| Answer» B. Mangrove forests | |
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Explanation: Mangrove Forest acts as barriers against cyclones and other natural disasters like tidal waves and tropical storms. They act as live sea walls against disasters and help minimize damage done to property and life. They also slow soil erosion and stabilize tidal banks against rising sea level, another climate change hazard. |
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| 365. |
Cyclones are caused due to – |
| A. | low pressure |
| B. | high pressure |
| C. | low temperature |
| D. | high density |
| Answer» A. low pressure | |
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Explanation: Cyclones are huge revolving storms caused by winds blowing around a central area of low atmospheric pressure. In the northern hemisphere, cyclones are called hurricanes or typhoons and their winds blow in an anti-clockwise circle. In the southern hemisphere, these tropical storms arc known as cyclones, whose winds blow in a clockwise circle. |
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| 366. |
What is a 'tornado'? |
| A. | A very high pressure centre |
| B. | A very low pressure centre |
| C. | A very high ocean wave |
| D. | A planetary wind |
| Answer» B. A very low pressure centre | |
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Explanation: A tornado is a closed low pressure circulation which is marked by a violently rotating column of air that is in contact with both the surface of the earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud. Low-pressure systems form under areas of wind divergence which occur in upper levels of the troposphere. The formation process of a low-pressure area is known as cyclogenesis. |
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| 367. |
If there is no carbon dioxide in the earth's atmosphere, the temperature of earth's surface would be – |
| A. | dependent on the amount of oxygen in the atmosphere |
| B. | higher than the present |
| C. | less than the present |
| D. | the same |
| Answer» C. less than the present | |
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Explanation: If there is no carbon dioxide in the earth's atmosphere, the temperature of earth's surface would be less than the present because carbon emission in the atmosphere is one of the major causes of global warming. |
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| 368. |
Name the continent where 'Tundra' type of climate is not found – |
| A. | Europe |
| B. | Asia |
| C. | Africa |
| D. | North America |
| Answer» C. Africa | |
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Explanation: The meaning of the word 'tundra' is 'a region in continents of Asia, Europe and North America, where the growth of trees is prevented due to low temperatures and permanently frozen subsoil'. These kinds of geographic areas are found near the North Pole and the South Pole. In physical-geography, tundra is a biome where the tree growth is hindered by low temperatures and short growing seasons. There are three types of tundra: Arctic tundra, alpine tundra, and Antarctic tundra. In tundra, the vegetation is composed of dwarf shrubs, sedges and grasses, mosses, and lichens. Scattered trees grow in some tundra. |
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| 369. |
Speed of wind is measured by – |
| A. | barometer |
| B. | hygrometer |
| C. | thermometer |
| D. | anemometer |
| Answer» D. anemometer | |
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Explanation: An anemometer is a device for measuring wind speed, and is a common weather station instrument. The term is derived from the Greek word anemos, meaning wind, and is used to describe any airspeed measurement instrument used in meteorology or aerodynamics. The first known description of an anemometer was given by Leon Battista Alberti around 1450. |
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| 370. |
Trade winds are due to – |
| A. | Conduction |
| B. | Convection |
| C. | Radiation |
| D. | Scattering |
| Answer» B. Convection | |
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Explanation: The air moving across the surface towards the extra heated region is known as the trade winds. The region where the northern convective airflow meets the southern and the air starts heading up instead of across the surface is known as the doldrums by sailors. The upwelling warm moist air expands, cools anddrops heavy rain, but since it's moving up instead of across it won't fill sails. |
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| 371. |
The ocean which touches the Asian and American shores is- |
| A. | Atlantic |
| B. | Indian |
| C. | Antarctic |
| D. | Pacific |
| Answer» D. Pacific | |
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Explanation: The Pacific Ocean extends from the Arctic in the north to the Southern Ocean (or, depending on definition, to Antarctica) in the south, bounded by Asia and Australia in the west, and the Americas in the east. This largest division of the World Ocean and, in turn, the hydrosphere - covers about 46% of the Earth's water surface and about one-third of its total surface area, making it larger than all of the Earth's land area combined. |
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| 372. |
El Nino is – |
| A. | a warm ocean current |
| B. | sea storm |
| C. | tropical disturbance |
| D. | another name of typhoon |
| Answer» A. a warm ocean current | |
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Explanation: El Nino (Spanish name for the male child), initially referred to a weak, warm current appearing annually around Christmas time along the coast of Ecuador and Peru and lasting only a few weeks to a month or more. Every three to seven years, an El Nino event may last for many months, having significant economic and atmospheric consequences worldwide. |
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| 373. |
Soil erosion on hill slopes can be checked by – |
| A. | Afforestation |
| B. | Terrace cultivation |
| C. | Strip cropping |
| D. | Contour ploughing |
| Answer» B. Terrace cultivation | |
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Explanation: Terrace farming is a type of farming that was developed first by the Incapeople. This method of farming uses "steps", called andenes that are built into the side of a mountain or hill. On each anden, various crops are planted, and when it rains, instead of washing away all of the nutrients in the soil, the nutrients are carried down to the next level. Additionally, these "steps" prevent a free flowing avalanche of water that would take plants with it and destroy the all of the crops on the hillside. |
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| 374. |
The crop mainly grown in hills is : |
| A. | sweet corn |
| B. | sweet jowar |
| C. | sweet potato |
| D. | sweet pea |
| Answer» B. sweet jowar | |
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Explanation: Sweet potato may be grown either on hills or beds. Rows need to be spaced 90-120 cm apart with plants spaced 30-40 cm apart in the row. It is known in Nepal as 'sakar kand.' It is grown both in the terai and the mid-hills throughout the country. It is the second most important root crop after potato in terms of production and area. |
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| 375. |
Dumping of solid waste in lowlying areas earth cover is called as : |
| A. | Sanitary land filing |
| B. | Open dumping |
| C. | Composting |
| D. | Incineration |
| Answer» A. Sanitary land filing | |
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Explanation: Sanitary landfills are low lying sites where waste is isolated from the environment until it is safe. It is considered when it has completely degraded biologically, chemically and physically. In high-income countries, the level of isolation achieved may be high. |
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| 376. |
The cause of loss of forest cover is – |
| A. | Agriculture |
| B. | Building Industry |
| C. | Increasing population |
| D. | Toursim & pilgrimage |
| Answer» C. Increasing population | |
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Explanation: Deforestation is a consequence of a quantum jump in population and the consequent over- exploitation of our natural ecosystems for space, energy and materials. Expanding agriculture due to a burgeoning population base is one of the most important causes of deforestation. As demands on agricultural products rise more and more land is brought under cultivation for which forests are cleared, grass-lands ploughed, uneven grounds leveled, marshes drained and even land under water is reclaimed. |
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| 377. |
Coastal Andhra Pradesh and Orissa often face natural disasters due to – |
| A. | Cyclones |
| B. | Earthquakes |
| C. | Landslides |
| D. | Tornadoes |
| Answer» A. Cyclones | |
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Explanation: During summer, the Bay of Bengal is subject to intense heating, giving rise to humid and unstable air masses that produce cyclones. Widespread death and property destruction are reported every year in exposed coastal states such as Andhra Pradesh and Odisha. Although cyclones affect the entire coast of India, the East Coast is more prone compared to the West Coast. Out of the cyclones that develop in the Bay of Bengal, over 58 percent approach and cross the east coast in October and November. |
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| 378. |
A broad, low embankment built up along the banks of a river channel during floods is called |
| A. | Delta |
| B. | Levee |
| C. | Flood Plain |
| D. | Dune |
| Answer» B. Levee | |
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Explanation: A levee, dike, dyke or flood bank is a broad, low embankment built up along thebanks of a river channel during floods. Levees are usually parallel to the way the river flows, so levees can help direct the flow of the river. Levees can also be artificially created or reinforced. |
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| 379. |
Which of the following is an alternative theory to the Big Bang theory developed in 1948, stating that the universe does not change even though it is expanding over time? |
| A. | Oscillating Universe |
| B. | Steady State Universe |
| C. | Mirror Universe |
| D. | Eternal Inflation |
| Answer» B. Steady State Universe | |
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Explanation: The Steady State theory (also known as the Infinite Universe theory or continuous creation) was developed in 1948 by Fred Hoyle, Thomas Gold, Hermann Bondi and others as an alternative to the Big Bang theory. In the steady-state theory, the density of matter in the expanding universe remains unchanged due to a continuous creation of matter. It asserts that the observable universe is basically the same at any time as well as at any place. |
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| 380. |
The constellation `Sapta Rishi' is known to Westerners as the – |
| A. | Seven Monks |
| B. | Alpha Centauri |
| C. | Big Dipper |
| D. | Small Bear |
| Answer» C. Big Dipper | |
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Explanation: The Steady State theory (also known as the Infinite Universe theory or continuous creation) was developed in 1948 by Fred Hoyle, Thomas Gold, Hermann Bondi and others as an alternative to the Big Bang theory. In the steady-state theory, the density of matter in the expanding universe remains unchanged due to a continuous creation of matter. It asserts that the observable universe is basically the same at any time as well as at any place. |
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| 381. |
Isohels are the isopleths of – |
| A. | sunshine |
| B. | flowering time |
| C. | rain |
| D. | clouds |
| Answer» A. sunshine | |
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Explanation: An isohel is line drawn on a map connecting points that receive equal amounts of sunlight. It is derived from hellos, meaning 'Sun.' |
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| 382. |
Which one of the following is the largest planet? |
| A. | Jupiter |
| B. | Venus |
| C. | Saturn |
| D. | Uranus |
| Answer» A. Jupiter | |
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Explanation: Jupiter is the fifth planet from the Sun and the largest planet in the Solar System. It is a gas giant with mass one-thousandth that of the Sun but is two and a half times the mass of all the other planets in the Solar System combined. |
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| 383. |
The largest planet in our solar system is |
| A. | Mars |
| B. | Jupiter |
| C. | Saturn |
| D. | Mercury |
| Answer» B. Jupiter | |
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Explanation: Jupiter is the fifth planet from the Sun and is the largest planet in the solar system. If Jupiter were hollow, more than one thousand Earths could fit inside. It also contains two and a half times the mass of all the other planets combined. It has a mass of 1.9 x kg and is 142,800 kilometers (88,736 miles) across the equator. |
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| 384. |
Equinox occurs when the sun is vertically above . |
| A. | Tropic of Capricorn |
| B. | Tropic of Cancer |
| C. | Poles |
| D. | Equator |
| Answer» D. Equator | |
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Explanation: An equinox is an astronomical event in which the plane of Earth's equator passes through the center of the Sun, which occurs twice each year, around 20 March and 23 September. The equinoxes are the only times when the Sun is exactly overhead at a point on the equatorial line. On an equinox, day and night are of approximately equal duration all over the planet. |
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| 385. |
Nappe is a kind of – |
| A. | fluvial feature |
| B. | folded structure |
| C. | erosional plain |
| D. | delta region |
| Answer» B. folded structure | |
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Explanation: In geology, a nappe or thrust sheet is a large sheet like body of rock that has been moved more than 2 km or 5 km from its original position by faulting or folding. They form when a mass of rock is forced (or "thrust") over another rock mass, typically on a low angle fault plane. The resulting structure may include large- scale recumbent folds, shearing along the fault plane. |
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| 386. |
The area which is resistant to any massive structural transformation is called – |
| A. | rigid mass |
| B. | ancient landmass |
| C. | tectonic plate |
| D. | shield |
| Answer» D. shield | |
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Explanation: A shield is generally a large area of exposed Precambrian crystalline igneous and high-grade metamorphic rocks that form tectonically stable areas. They are resistant to geological structural transformation. They are normally the nucleus of continents. |
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| 387. |
Lake formed in a cut off river, meander is called: |
| A. | Playa Lake |
| B. | Meteoric Lake |
| C. | Ox-Bow Lake |
| D. | Crater Lake |
| Answer» C. Ox-Bow Lake | |
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Explanation: An oxbow lake is a U-shaped body of water formed when a wide meander from the main stem of a river is cut off to create a lake. This landform is called an oxbow lake for the distinctive curved shape, named after part of a yoke for oxen. |
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| 388. |
Sandstone is metamorphosed to: |
| A. | Shale |
| B. | Slate |
| C. | Quartzite |
| D. | Marble |
| Answer» C. Quartzite | |
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Explanation: Sandstone can be turned into a metamorphic rock by being either heated up to a point where it undergoes a significant change or subjected to high pressures, or subjected to chemically active fluids, or some combination thereof. A common result of the metamorphosis of sandstone is the creation of quartzite. |
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| 389. |
The greatest erosive power of a river is associated with – |
| A. | gorges |
| B. | meanders |
| C. | inter-locking spurs |
| D. | V-shaped valley |
| Answer» B. meanders | |
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Explanation: Erosive power of a stream is proportional to the square of the velocity. Thus, when discharge increases, the depth increases and the velocity increases, resulting in dramatic increase of erosive power. As the volume flowing in a stream increases, the stream's erosive power also increases. At a bend in a stream the water's momentum carries the mass of the water against the outer bank. The greater depth on the outer side of the bend also leads to higher velocity at the outer bank. The greater velocity combined with the greater inertial force on the outer bank erodes a deeper channel. The result of all these actions is a meander |
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| 390. |
Prime Meridian passes through – |
| A. | Greenwich |
| B. | Ujjain |
| C. | New York |
| D. | Tokyo |
| Answer» A. Greenwich | |
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Explanation: A prime meridian is a meridian, i.e. a line of longitude, at which longitude is defined to be 0°. An international conference in 1884 decided the prime meridian passes through the Royal Observatory, Greenwich in southeast London, United Kingdom, known simply as the prime meridian |
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| 391. |
What percentage of world's freshwater is stored as glacial ice? |
| A. | 50% |
| B. | 10% |
| C. | 70% |
| D. | 30% |
| Answer» C. 70% | |
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Explanation: About 70% of the world's fresh water is stored as glacial ice. Only 3% water of the earth is fresh, rest 97% salted. Of that 3%, over 2% is frozen in ice sheets and glaciers. Means less than 1% fresh water is found in lakes, rivers and underground. |
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| 392. |
The approximate circumference of the Earth is – |
| A. | 13,000 km |
| B. | 20,000 km |
| C. | 25,000 km |
| D. | 30,000 km |
| Answer» C. 25,000 km | |
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Explanation: The circumference of the earth at the equator is 24,901.55 miles (40,075.16 kilometers). But, if we measure the earth through the poles the circumference is a bit shorter - 24,859.82 miles (40,008 km). Thus, the earth is a tad wider than it is tall, giving it a slight bulge at the equator. This shape is known as an ellipsoid or more properly, geoid (earth-like). |
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| 393. |
Which one of the following is igneous rock? |
| A. | Limestone |
| B. | Granite |
| C. | Marble |
| D. | Slate |
| Answer» B. Granite | |
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Explanation: Igneous rock (derived from the Latin word ignis meaning fire) is one of the three main rock types, the others being sedimentary and metamorphic rock. Igneous rock is formed through the cooling and solidification of magma or lava. Igneous rock may form with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks. This magma can be derived from partial melts of pre-existing rocks in either a planet's mantle or crust. Typically, the melting is caused by one or more of three processes: an increase in temperature, a decrease in pressure, or a change in composition. |
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| 394. |
How many minutes for each degree of longitude does the local time of any place vary from the Greenwich time? |
| A. | Two minutes |
| B. | Four minutes |
| C. | Six minutes |
| D. | Eight minutes |
| Answer» B. Four minutes | |
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Explanation: The first of these ideas is the relationship between time and the rotation of the Earth. It takes an average time of 24 hours for the Earth to rotate 360 degrees. If you divide the number degrees in a circle by the number of hours in a day, we find that the Earth turns 15 degrees each hour. 360°/24 hours = 15° per hour. We can take this a step further and state that the Earth turns one degree in four minutes. 1 hour = 60 minutes / 15° = 4 minutes per degree |
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| 395. |
The Grand Canyon is located on the : |
| A. | Colorado River |
| B. | Rhine River |
| C. | Tapi River |
| D. | Niger River |
| Answer» A. Colorado River | |
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Explanation: The Grand Canyon is a steep- sided canyon carved by the Colorado River in the United States in the state of Arizona. It is contained within and managed by Grand Canyon National Park, the Hualapai Tribal Nation, and the Havasupai Tribe. President Theodore Roosevelt was a major proponent of preservation of the Grand Canyon area. A number of processes combined to create the views that we see in today's Grand Canyon. The most powerful force to have an impact on the Grand Canyon is erosion, primarily by water (and ice) and second by wind. |
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| 396. |
The vertical movement of air is termed as – |
| A. | wind |
| B. | air current |
| C. | air turbulence |
| D. | air mobility |
| Answer» B. air current | |
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Explanation: An updraught or downdraught is the vertical movement of air as a weather related phenomenon. Better known as air current, they can be caused by differences in temperature, pressure, or impurity concentration. Temperature differences can cause air currents because warmer air is less dense than cooler air, causing the warmer air to appear "lighter."Rising air is associated with turbulence as it creates a low pressure on the surface. |
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| 397. |
The atmospheric layer closest to the earth is: |
| A. | Mesosphere |
| B. | Hydrosphere |
| C. | Troposphere |
| D. | Ionosphere |
| Answer» C. Troposphere | |
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Explanation: The troposphere is the lowest portion of Earth's atmosphere. It contains approximately 80% of the atmosphere's mass and 99% of its water vapor and aerosols. Most of the phenomena we associate with day-to-day weather occur in the troposphere. |
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| 398. |
Storms of gases are visible in the chromosphere of the Sun during – |
| A. | Cyclones |
| B. | Anticyclones |
| C. | Lunar eclipse |
| D. | Solar eclipse |
| Answer» D. Solar eclipse | |
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Explanation: As seen from the Earth, a solar eclipse occurs when the Moon passes between the Sun and Earth, and the Moon fully or partially blocks the Sun. This can happen only at new moon, when the Sun and the Moon are in conjunction as seen from Earth. In a total eclipse, the disk of the Sun is fully obscured by the Moon. In partial and annular eclipses only part of the Sun is obscured. The moon blocks out the bulk of the sun allowing us to see the chromosphere and corona. |
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| 399. |
Recharging of water table depends on – |
| A. | amount of rainfall |
| B. | relief of the area |
| C. | vegetation of the area |
| D. | amount of percolation |
| Answer» B. relief of the area | |
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Explanation: The water table may vary due to seasonal changes in precipitation, evapotranspiration, topography and structural geology. In undeveloped regions with permeablesoils that receive sufficient amounts of precipitation, the water table typically slopes toward rivers that act to drain the groundwater away and release the pressure in the aquifer for the relief of the area. |
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| 400. |
The line on a map connecting points of equal temperature at a given time is – |
| A. | Isohyet |
| B. | Isobar |
| C. | Isthumus |
| D. | Isotherm |
| Answer» D. Isotherm | |
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Explanation: An isotherm is a line that connects points on a map that have the same temperature. Therefore, all points through which an isotherm passes have the same or equal temperatures at the time indicated. Generally, isotherms representing 5°C or 10°F temperature differences are used, but any interval may be chosen. |
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