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Question 1836

What is the first artificial satellite to orbit Earth ?

ASputnik I

BExplorer I

CVanguard I

DDiscoverer I

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A. Sputnik ISputnik I was the first artificial satellite to orbit the Earth. It was launched by the Soviet Union on October 4, 1957. The successful launch of Sputnik I marked the beginning of the space age and initiated the space race between the USA and the USSR. Explorer I: First U.S. satellite, launched in 1958.Vanguard I: A U.S. satellite launched later in 1958.Discoverer I: Part of an American reconnaissance satellite program (1959).

Question 1822

Which of the following colours is not seen in a rainbow ?

AYellow

BGreen

CRed

DBrown

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D. BrownBrown is not seen in a rainbow. A natural rainbow displays seven distinct colours — Violet, Indigo, Blue, Green, Yellow, Orange, and Red (VIBGYOR). These colours appear due to the dispersion of sunlight by water droplets in the atmosphere, but brown is not part of the visible spectrum formed by dispersion. Yellow, Green, Red: All are part of the seven colours of the rainbow.

Question 1799

Running water is the source of:

Ahydel power

Bthermal Power

Cnuclear power

DNone of the Above

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A. hydel powerRunning water is the source of hydel power (also called hydroelectric power). The energy of flowing or falling water is converted into electrical energy using turbines and generators in dams. It is a renewable, clean, and sustainable source of energy widely used in India and worldwide. Thermal power: Generated by burning coal or other fuels.Nuclear power: Produced from nuclear fission reactions.None of the above: Incorrect — running water directly produces hydel power.

Question 1773

In India which is the most widely used form of renewable energy ?

AGeothermal energy

BHydro-electric energy

CSolar energy

DThermal energy

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C. Solar energyIn India, the most widely used form of renewable energy is Solar Energy. Due to the country’s tropical location, India receives abundant sunlight throughout the year, making solar power a highly viable and sustainable energy source. It is harnessed using solar panels for electricity generation and heating applications under initiatives like National Solar Mission. Geothermal energy: Used only in limited pilot projects.Hydro-electric energy: Important but not as rapidly expanding as solar.Thermal energy: Usually refers to non-renewable coal-based power plants.

Question 1772

In your opinion which of the following is due to ozone hole ?

AIncreased UV radiation

BAcid rain

CGlobal warming

DGreenhouse effect

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A. Increased UV radiationThe ozone hole leads to an increase in ultraviolet (UV) radiation reaching the Earth's surface. The depletion of the ozone layer, caused by chemicals like CFCs (chlorofluorocarbons), reduces its ability to block harmful UV rays. This can result in health issues such as skin cancer, cataracts, and also harm to crops and marine ecosystems. Acid rain: Caused by sulphur and nitrogen oxides, not ozone depletion.Global warming: Caused by greenhouse gases trapping heat.Greenhouse effect: Natural process intensified by CO₂, not related to ozone loss.

Question 1771

In organic farming:

Aintercropping is not used

Bmanures are not used

Cbiofertilizers are not used

Dchemical fertilizers are not used

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D. chemical fertilizers are not usedIn organic farming, chemical fertilizers are not used. Instead, farmers rely on natural manures, compost, and biofertilizers to enrich the soil. Organic farming avoids synthetic pesticides and focuses on maintaining ecological balance, soil fertility, and sustainable crop production. Intercropping: Often used to increase productivity naturally.Manures: Essential in organic farming for soil health.Biofertilizers: Widely used to promote natural nutrient availability.

Question 1770

Ramsar Convention is for the conservation of:

AMountain

BGrassland

CForest

DWetland

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D. WetlandThe Ramsar Convention is an international treaty for the conservation and sustainable use of wetlands. Signed in 1971 at Ramsar, Iran, it aims to preserve wetlands as habitats for biodiversity, especially for migratory birds. It promotes wise use of wetland ecosystems through local and national actions. Mountain: Conserved under other ecological programs.Grassland: Managed under terrestrial biodiversity initiatives.Forest: Covered under the UN Forest Forum, not Ramsar.

Question 1769

Ocean thermal energy is due to:

Atides in the ocean

Bpressure difference at different levels in the ocean

Ctemperature difference at different levels in the ocean

Denergy stored by waves in the ocean

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C. temperature difference at different levels in the oceanOcean Thermal Energy (OTE) is produced due to the temperature difference at different levels in the ocean. The surface water is warmer because it absorbs sunlight, while the deeper layers remain cold. This temperature gradient is used to run a heat engine that generates electricity — a process known as Ocean Thermal Energy Conversion (OTEC). Tides: Related to gravitational pull, not temperature.Pressure difference: Exists but not used for energy generation.Waves: Used in wave energy systems, not OTEC.

Question 1767

Which of the following compounds is used in fire extinguishers ?

ASodium carbonate

BSodium bicarbonate

CSodium nitrate

DSodium sulphate

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B. Sodium bicarbonateSodium bicarbonate (NaHCO₃), also known as baking soda, is used in fire extinguishers. When heated, it decomposes to produce carbon dioxide (CO₂), which displaces oxygen and helps smother the fire. It is especially effective for extinguishing electrical and small grease fires. Sodium carbonate: Used in glass and soap making, not for fire control.Sodium nitrate: An oxidizing agent, not suitable for extinguishing fires.Sodium sulphate: Used in detergents and paper making, not in fire extinguishers.

Question 1766

Which of the following is the largest ecological unit ?

AOrganism

BPopulation

CBiome

DEcosystem

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C. BiomeThe Biome is the largest ecological unit. It includes several ecosystems that share similar climate, vegetation, and animal life. Examples include tundra, desert, rainforest, and grassland. A biome represents a major community of living organisms adapted to a specific environment over large geographical areas. Organism: An individual living being.Population: A group of the same species living in an area.Ecosystem: Includes both living and non-living components, but multiple ecosystems together form a biome.

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Science

What is the first artificial satellite to orbit Earth ?

Which of the following colours is not seen in a rainbow ?

Running water is the source of:

In India which is the most widely used form of renewable energy ?

In your opinion which of the following is due to ozone hole ?

In organic farming:

Ramsar Convention is for the conservation of:

Ocean thermal energy is due to:

Which of the following compounds is used in fire extinguishers ?

Which of the following is the largest ecological unit ?

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