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Question 426

Arya Bhatt was a renowned Indian

AChemist

BPhysician

CAstronomer

DNone of these

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C. AstronomerAryabhata was a renowned ancient Indian mathematician and astronomer. He lived during the period of Gupta Empire.

Question 409

Which of the following is a greenhouse gas

AChlorofluoro carbon

BCarbon

CCalcium

DNone of these

Show answer

A. Chlorofluoro carbonChlorofluorocarbons (CFCs) are considered greenhouse gases due to their ability to trap heat in the Earth's atmosphere.

Question 407

The sky looks blue due to

ADispersion of Sunlight

BScattering of Sunlight

CRefraction of Sunlight

DNone of these

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B. Scattering of SunlightThe scattering of sunlight is a phenomenon that occurs when sunlight interacts with particles or molecules in the Earth's atmosphere, causing the light to change direction and spread out in various directions.

Question 406

Which one of the following is a chemical change?

AMelting of ice

BMagnetising of Iron

CBurning of coal

DNone of these

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C. Burning of coalA chemical change, also called a chemical reaction, happens when substances combine or break apart to form entirely new substances with different properties.

Question 405

Pure gold is of

A24 Carat

B18 Carat

C22 Carat

DNone of these

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A. 24 CaratA "carat" is a unit of measurement used to express the weight of gemstones, particularly diamonds and gold etc.

Question 404

When a moving bus suddenly stops, passengers sitting inside leans forward. This is due to

AConservation of Mass

BInertia of rest

CInertia of Motion

DNone of these

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C. Inertia of MotionInertia of motion is defined as the property of a body to resist any change to its state of uniform motion.

Question 403

A heavy stone appears to be lighter in water. This is due to

AUpward pressure of water

BDownward pressure of water

CLateral pressure of water

DNone of these

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A. Upward pressure of waterExplanation: A heavy stone appears lighter when immersed in water because of the upward pressure or buoyant force exerted by the water. This phenomenon is explained by Archimedes’ Principle, which states that a body immersed in a fluid experiences an upward force equal to the weight of the fluid displaced by it. The greater the volume of the object submerged, the greater the buoyant force acting on it. Hence, the stone seems lighter in water, even though its actual mass remains the same.

Question 402

Who discovered Lysergic acid diethylamide (LSD)

ALinus Pauling

BAlexander Fleming

CAlbert Hofmann

DNone of these

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C. Albert HofmannExplanation: Lysergic acid diethylamide (LSD) was discovered by Dr. Albert Hofmann, a Swiss chemist, in 1938 at the Sandoz Laboratories in Switzerland. LSD is a powerful hallucinogenic compound derived from lysergic acid, which occurs in the fungus Claviceps purpurea (ergot) that grows on rye. Hofmann accidentally discovered its psychological effects in 1943 when he absorbed a small amount through his skin, leading to vivid visual hallucinations. LSD acts on serotonin receptors in the brain and profoundly alters perception and mood.

Question 264

Which microorganism is responsible for Dengue fever?

AFungi

BViruses

CBacteria

DProtozoa

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B. VirusesExplanation: Dengue fever is caused by the Dengue virus, which belongs to the Flavivirus group. It is transmitted to humans through the bite of an infected Aedes aegypti mosquito. The virus multiplies in the blood and causes symptoms such as high fever, severe headache, joint and muscle pain, rashes, and low platelet count. In severe cases, it can lead to Dengue hemorrhagic fever or Dengue shock syndrome. Prevention includes controlling mosquito breeding and avoiding mosquito bites.

Question 252

What is the name of first Indian Artificial satellite?

AApollo

BRohini

CBhaskara

DAryabhatta

Show answer

D. Aryabhattalaunched by the Soviet Union on 19 April 1975 and built by the Indian Space Research Organisation (ISRO)

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Science

Arya Bhatt was a renowned Indian

Which of the following is a greenhouse gas

The sky looks blue due to

Which one of the following is a chemical change?

Pure gold is of

When a moving bus suddenly stops, passengers sitting inside leans forward. This is due to

A heavy stone appears to be lighter in water. This is due to

Who discovered Lysergic acid diethylamide (LSD)

Which microorganism is responsible for Dengue fever?

What is the name of first Indian Artificial satellite?

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