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Question 641

Which of the following colours is not a primary colour ?

ARed

BYellow

CGreen

DBlue

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B. YellowExplanation: The primary colours of light are Red, Green, and Blue (RGB). These are the fundamental colours that can be combined in different proportions to produce all other colours in the visible spectrum. Yellow is not a primary colour—it is a secondary colour formed by mixing red and green light. This principle of colour mixing is used in television, computer screens, and other digital displays that use RGB colour models.

Question 638

Minamata disease in Japan was caused due to pollution of water by :

ALead

BMercury

CCyanide

DArsenic

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B. MercuryExplanation: Minamata disease was caused by severe mercury poisoning in the coastal city of Minamata, Japan. It resulted from the discharge of methyl mercury compounds into Minamata Bay by a chemical factory (Chisso Corporation) during the 1950s and 1960s. The toxic mercury accumulated in fish and shellfish, which were later consumed by local residents. Symptoms included numbness, muscle weakness, loss of vision, hearing and speech, paralysis, and in severe cases, death. This incident is one of the world’s worst cases of industrial pollution.

Question 637

Which of the following can cause depletion of Ozone layer ?

AHydrogen Sulphide

BSmoke

CAerosols

DHydrogen gas

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C. AerosolsExplanation: Aerosols (such as those used in spray cans, refrigerants, and air conditioners) often contain chlorofluorocarbons (CFCs) and other halogen compounds. These chemicals rise to the stratosphere, where ultraviolet (UV) radiation breaks them down, releasing chlorine atoms. Each chlorine atom can destroy thousands of ozone (O₃) molecules, leading to ozone layer depletion. The thinning of the ozone layer allows more harmful UV rays to reach Earth, increasing the risk of skin cancer, eye damage, and affecting ecosystems.

Question 636

When a bus starts suddenly, the passengers sitting in the bus lean backward. This is because of :

AInertia of rest

BInertia of motion

CMomentum

DGravity of the earth

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A. Inertia of restExplanation: When a bus starts suddenly, the passengers tend to lean backward due to the inertia of rest. Inertia is the tendency of a body to resist any change in its state of motion or rest. The lower part of the passenger’s body moves forward with the bus as it starts, but the upper part of the body tends to remain at rest momentarily. This makes the passenger appear to fall backward relative to the bus. It is a clear example of Newton’s First Law of Motion.

Question 635

Indian Space Research Organisation (ISRO) is located in :

ABombay

BHyderabad

CBangalore

DTrombay

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C. BangaloreExplanation: The Indian Space Research Organisation (ISRO) is headquartered in Bangalore (Bengaluru), Karnataka. It was established in 1969 under the guidance of Dr. Vikram Sarabhai, who is known as the father of the Indian space program. ISRO is India’s national space agency, responsible for space research, satellite launches, and planetary exploration. It developed major missions such as Chandrayaan (Moon mission), Mangalyaan (Mars Orbiter Mission), and PSLV & GSLV launch vehicles.

Question 634

Lack of Vitamin A may cause

APoor night vision

BRickets

CBeri Beri

DNone of these

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A. Poor night visionExplanation: Vitamin A is essential for maintaining healthy vision, skin, and immune function. A deficiency of Vitamin A leads to night blindness (nyctalopia), a condition in which a person has difficulty seeing in dim light or at night. In severe cases, it can cause xerophthalmia (dryness of the cornea) and even blindness. Vitamin A is obtained from foods such as carrots, milk, butter, fish liver oil, and green leafy vegetables.

Question 633

The branch of medical science that deals with diseases and problems specific to old people is:

ACytology

BGeology

CGerontology

DZoology

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C. GerontologyExplanation: Gerontology is the branch of medical and biological science that deals with the study of aging and the diseases and problems specific to old age. It focuses on understanding the physical, mental, and social changes that occur in elderly individuals, as well as methods to promote healthy aging. Gerontology includes aspects of geriatrics, which specifically involves the medical care and treatment of elderly patients.

Question 632

Insulin is secreted by :

APancreas

BLiver

CGall Bladder

DKidney

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A. PancreasExplanation: Insulin is a hormone secreted by the beta (β) cells of the Islets of Langerhans in the pancreas. Its main function is to regulate the blood glucose level by promoting the uptake of glucose into cells and converting excess glucose into glycogen in the liver and muscles. A deficiency or lack of insulin causes diabetes mellitus, leading to high blood sugar levels. The pancreas also secretes glucagon, which performs the opposite function by increasing blood glucose levels.

Question 631

Which of the following diseases is not caused by virus ?

ASmall pox

BAIDS

CFlue

DMalaria

Show answer

D. MalariaExplanation: Malaria is not caused by a virus; it is caused by a protozoan parasite of the genus Plasmodium. The disease spreads through the bite of an infected female Anopheles mosquito. The parasite enters the human bloodstream, infects liver cells, and then red blood cells, leading to recurring fever, chills, and anemia. In contrast, Smallpox, AIDS, and Flu are all viral diseases caused by the Variola virus, HIV, and Influenza virus respectively.

Question 630

Man first landed on the surface of the Moon in :

A1967

B1968

C1969

D1970

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C. 1969Explanation: Humans first landed on the Moon on July 20, 1969, during NASA’s Apollo 11 mission. American astronauts Neil Armstrong and Edwin “Buzz” Aldrin became the first and second humans to walk on the Moon, while Michael Collins orbited above in the command module. Neil Armstrong’s famous words, “That’s one small step for man, one giant leap for mankind,” marked this historic achievement in space exploration.

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Science

Which of the following colours is not a primary colour ?

Minamata disease in Japan was caused due to pollution of water by :

Which of the following can cause depletion of Ozone layer ?

When a bus starts suddenly, the passengers sitting in the bus lean backward. This is because of :

Indian Space Research Organisation (ISRO) is located in :

Lack of Vitamin A may cause

The branch of medical science that deals with diseases and problems specific to old people is:

Insulin is secreted by :

Which of the following diseases is not caused by virus ?

Man first landed on the surface of the Moon in :

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