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451.

A dim, "watery" sun visible through a gray sheet-like cloud layer is often a good indication of ____ clouds.

Answer»

 ALTOSTRATUS



A DIM, "watery" sun visible through a GRAY sheet-like cloud layer is OFTEN a good indication of Altostratus CLOUDS.

452.

_________ is the most commonly used unit of radiation

Answer»

 Curie



The units of MEASURE for radioactivity are the curie (Ci) and becquerel (BQ). Exposure describes the amount of radiation traveling through the air. Many radiation monitors measure exposure. The units for exposure are the ROENTGEN (R) and coulomb/kilogram (C/kg).

453.

Nuclear accidents mostly release radioactive __________ into the atmosphere

Answer»

 IODINE



Nuclear ACCIDENTS MOSTLY release radioactive iodine into the ATMOSPHERE.

454.

The gas responsible for the greenhouse effect on Venus is:

Answer»

 Carbon dioxide (CO2)



The Venusian atmosphere is MAINLY made up of carbon dioxide, a greenhouse GAS. On Earth, carbon dioxide makes up only a tiny fraction of the atmosphere. However, man-made emissions have caused carbon dioxide CONCENTRATIONS here to increase by about 30% since pre-industrial TIMES.

455.

The crack marked on a glacier due to splitting of ice is called

Answer»

 crevasses



A CREVASSE is a deep crack, or fracture, FOUND in an ICE sheet or glacier, as opposed to a CREVICE that forms in ROCK.

456.

The temperature at which water boils depends mainly on:

Answer»

 AIR PRESSURE



The temperature at which WATER boils depends mainly on air pressure.

457.

Rising air cools by this process:

Answer»

 Expansion



Clouds form when moist, WARM RISING air cools and expands in the atmosphere. The water vapor in the air CONDENSES to form TINY water droplets which are the basis of clouds.

458.

Energy of motion is also known as:

Answer»

 KINETIC energy



Kinetic energy is the energy of motion. All moving objects have kinetic energy. When an OBJECT is in motion, it CHANGES its position by moving in a direction: up, down, FORWARD, or backward.

459.

If you want to keep an object cool while exposed to direct sunlight,

Answer»

 Wrap it in ALUMINUM foil with the SHINY side facing OUTWARD



If you want to keep an OBJECT cool while exposed to direct SUNLIGHT, wrap it in aluminum foil with the shiny side facing outward.

460.

In ecological succession from pioneer to climax community, the biomass shall

Answer»

 INCREASE continuously



When the community MOVED from a pioneer community to the climax community, the BIOMASS will increase. This will increase the biomass because the number of organisms belonging to different species will also increase.

461.

If water vapour comprises 3.5 percent of an air parcel whose total pressure is 1,000 mb, the water vapour pressure would be:

Answer»

 35 mb



If water vapour comprises 3.5 percent of an AIR PARCEL whose total pressure is 1,000 mb, the water vapour pressure WOULD be 35 mb.

462.

Photochemical smog is called

Answer»

 LOS ANGELES SMOG



Photochemical smog is CALLED Los Angeles smog.

463.

Thorn-forests are found in the _______ regions.

Answer»

 semi-arid



This type of vegetation is FOUND in the north-western PART of the country including semi-arid areas of Gujarat,Rajasthan, Madhya Pradesh, CHHATTISGARH, UTTAR Pradesh and Haryana. Acacias, PALMS, euphorbias and cacti are the main plant species.

464.

A high Biological Oxygen Demand (BOD) indicates that:

Answer»

 High level of microbial pollution



A high BOD indicates the PRESENCE of a LARGE number of microorganisms, which SUGGESTS a high level of pollution.

465.

The process of successful establishment of the species in a new area is called

Answer»

 ecesis



The process of SUCCESSFUL establishment of the species in a NEW area is called ecesis.

466.

The mean of annual rainfall in India is

Answer»

 110 cm



The mean of ANNUAL RAINFALL in INDIA is 110 cm.

467.

Which of the following is mainly responsible for the extinction of wild life

Answer»

 All of these



All of these.

468.

The conversion of ammonia to nitrate is known as ________

Answer»

 NITRIFICATION



Nitrosomonas convert ammonia into nitrates by a PROCESS called nitrification. It is performed in TWO STEPS – nitrite FORMATION and nitrate formation.

469.

High biological oxygen demand indicates:

Answer»

 intense level of microbial pollution



BOD INDICATES the amount of putrescible organic matter present in water. Therefore, a low BOD is an indicator of GOOD quality water, while a high BOD indicates polluted water. Dissolved OXYGEN (DO) is consumed by BACTERIA when large amounts of organic matter from sewage or other discharges are present in the water.

470.

Centre of Modern nuclear technology in India

Answer»

 BARC



The BHABHA Atomic RESEARCH Centre (BARC) is India's premier NUCLEAR research facility, headquartered in Trombay, Mumbai, MAHARASHTRA. BARC is a multi-disciplinary research centre with extensive infrastructure for advanced research and development covering the entire spectrum of nuclear science, engineering and related areas.
BARC's core mandate is to sustain peaceful applications of nuclear ENERGY, primarily for power generation.

471.

Pollutants that are introduced into the environment by human activity are called as

Answer»

 ANTHROPOGENIC pollutants



Anthropogenic POLLUTION is not new—humans have contributed to the environmental BURDEN since they learned to CONTROL fire and smelt metals. HOWEVER, the nature and distribution of contaminants in the environment has changed in recent history as new compounds have been created

472.

In a food chain of grassland ecosystem the top consumers are

Answer»

 Carnivorous



The main REASON why in a FOOD CHAIN of the GRASSLAND ecosystem, the top consumers are carnivorous because they are not EATEN by others.

473.

Diversity of organisms include three Domains such as

Answer»

 bacteria, ARCHAE, EUKARYA



Organisms can be classified into one of three domains based on differences in the SEQUENCES of nucleotides in the cell's ribosomal RNAs (rRNA), the cell's membrane lipid structure, and its SENSITIVITY to antibiotics. The three domains are the ARCHAEA, the Bacteria, and the Eukarya.

474.

Moisture in the air is known as

Answer»

 HUMIDITY



Moisture in the air is KNOWN as humidity. Humidity is the MEASURE of the amount of water vapour in a GENERAL AREA.

475.

Favorable morphological and physiological response to a change in environment is called

Answer»

 Acclimatisation



Acclimatisation is the PROCESS in which an individual organism adjusts to a change in its ENVIRONMENT (such as a change in ALTITUDE, temperature, humidity, photoperiod, or pH), allowing it to maintain performance across a RANGE of environmental conditions. Hence, the correct answer is 'Acclimatisation'.

476.

The earth's atmosphere is divided into layers based on the vertical profile of:

Answer»

 Air temperature



The TERM upper ATMOSPHERE usually refers to the REGION of the atmosphere above the troposphere.
Many remote sensing satellites follow the NEAR polar sun-synchronous orbits at a height around 800 km, which is well above the thermopause.

477.

Suppose saturated polar air has an air temperature and dew point of -10o C, and unsaturated desert air has an air temperature of 35o C and a dew point of 10o C. The desert air contains ______ water vapour and has a ________ relative humidity than the polar air.

Answer»

 More, lower



Suppose saturated polar AIR has an air temperature and dew point of -10o C, and UNSATURATED DESERT air has an air temperature of 35O C and a dew point of 10o C. The desert air contains more water vapour and has a RELATIVE humidity than the polar air.

478.

The strongest radiation inversions occur when

Answer»

 Skies are CLEAR



The STRONGEST radiation INVERSIONS occur when skies are clear.

479.

At middle latitudes, the base of an altostratus or altocumulus cloud would generally be found between:

Answer»

 6,500 and 23,000 FEET



At middle LATITUDES, the base of an altostratus or ALTOCUMULUS cloud would generally be found between: 6,500 and 23,000 feet.

480.

Biotic potential is counteracted by

Answer»

 NONE of the above



None of the above

481.

The term "latent" means:

Answer»

 Hidden



The term "latent" MEANS: EXISTING but not yet DEVELOPED or MANIFEST; hidden or concealed.

482.

Green Revolution in India was initiated by __________

Answer»

 M.S. Swaminathan



M.S. Swaminathan is an INDIAN geneticist and international administrator, renowned for his leading ROLE in India's GREEN Revolution a program under which high-yield varieties of wheat and RICE SEEDLINGS were planted in the fields of poor farmers.

483.

Major cause of Ozone depletion is due to which chemical?

Answer»

 ChloroFluoroCarbons



Chlorofluorocarbons (CFCs) and other halogenated ozone depleting SUBSTANCES (ODS) are mainly RESPONSIBLE for man-made chemical ozone depletion. The total amount of effective halogens (chlorine and BROMINE) in the stratosphere can be calculated and are known as the equivalent effective stratospheric chlorine (EESC).

484.

Pangolins feed on

Answer»

 ants



The diet of PANGOLINS is fairly simple and STRAIGHTFORWARD. They are carnivorous animals, usually CONSUMING a wide VARIETY of ant and termite SPECIES, but are also able to eat larvae and a few other insects.

485.

Heat transferred outward from the surface of the moon can take place by:

Answer»

 RADIATION



In space, heat gets transferred by radiation. This is mainly in the infrared band of ELECTROMAGNETIC waves. EARTH, gets HEATED up due to earth's atmosphere and also due to greenhouse effect.

486.

Most of the natural gas used in the United States is consumed by

Answer»

 residential use



In the United States, most NATURAL gas is burned as a fuel. In 2012 about 30% of the energy consumed across the nation was obtained from natural gas. It was used to GENERATE electricity, heat buildings, fuel vehicles, heat WATER, BAKE foods, power industrial furnaces, and even run air conditioners!

487.

_________ ecosystems are maintained artificially by man.

Answer»

 Man-made



Artificial ECOSYSTEMS are MAINTAINED artificially by man. A pond CONSTRUCTED as a part of wastewater treatment plant is an example of artificial ECOSYSTEM. In these types of ecosystem, the only source of POWER is solar energy.

488.

In which year Silent Valley was declared as National Park?

Answer»

 1984



In 1983 the then Prime Minister of India, Indira GANDHI, DECIDED to abandon the Project. In the year of 1984, it was declared as a NATIONAL Park with the project area included. In 1986, the Silent Valley was declared the core area in the Nilgiri Biosphere Reserve.

489.

The development of a bare area without any life form is called

Answer»

 NUDATION



The DEVELOPMENT of a bare AREA WITHOUT any life FORM is called Nudation.

490.

Which of the processes is used to dispose the radioactive wastes?

Answer»

 vary based on ACTIVITY



Vary based on activity is USED to DISPOSE the RADIOACTIVE wastes.

491.

Fog that forms off the coast of Newfoundland is mainly a form of:

Answer»

 ADVECTION fog



Fog that FORMS off the COAST of Newfoundland is MAINLY a form of advection fog.

492.

Ideal conditions for a strong radiation inversion:

Answer»

 CLEAR, CALM, dry, WINTER night



Ideal CONDITIONS for a strong radiation inversion: Clear, calm, dry, winter night.

493.

_______ is an example of "bottom feeders".

Answer»

 CAT FISH



Cat fish is an EXAMPLE of "BOTTOM FEEDERS".

494.

The pyramid of numbers in a single tree is

Answer»

 Spindle shaped



The PYRAMID of NUMBERS in a SINGLE tree is spindle shaped.

495.

The capacity to do work is termed as

Answer»

 Energy



Energy is DEFINED as the CAPACITY to do WORK.

496.

Blue revolution is associated with

Answer»

 Fishing



The term "blue revolution" REFERS to the REMARKABLE emergence of aquaculture as an important and HIGHLY productive agricultural activity. Aquaculture refers to all forms of active culturing of aquatic animals and plants, occurring in marine, BRACKISH, or fresh waters.

497.

Trophic levels are formed by

Answer»

 Organisms linked in food CHAIN



Trophic levels in a food chain are formed by PRODUCERS, CONSUMERS and decomposers. In the GIVEN food chain, plants are producers. The ANIMALS eating plants are called as primary consumers and animals eating primary consumers are called as secondary consumers.

498.

_________ are used for converting saline or brackish water into pure distilled water.

Answer»

 Solar DESALINATION systems



Distillation desalination is one of mankind's earliest forms of WATER TREATMENT, and it is still a popular treatment solution throughout the world today. In ancient times, many civilizations used this process on their SHIPS to convert sea water into DRINKING water.

499.

Molten rock deep inside the earth is called

Answer»

 magma



Below the crust lies a layer of very hot, almost solid rock called the mantle. BENEATH the mantle lies the CORE. ... SOMETIMES, hot molten rock, called magma, bursts through EARTH's surface in the form of a volcano.

500.

Red Data Book Provides data on

Answer»

 Endangered plants and animals



The Red data book is the STATE document established for DOCUMENTING RARE and endangered species of animals, plants and FUNGI. This book provides central information for studies and monitoring programmes on rare and endangered species and their habits.