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Science

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Question 3728

In which year was the "@" chosen for its use in e-mail addresses?

A1972

B1976

C1980

D1984

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A. 1972Explanation not yet available.

Question 3725

Plants absorb dissolved nitrates from soil and convert them into:

Afree nitrogen

Burea

Cammonia

Dproteins

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C. ammoniaExplanation: Plants absorb nitrogen from the soil mainly in the form of nitrates (NO₃⁻). Inside the plant, nitrates are reduced to nitrites (NO₂⁻) and then to ammonia (NH₃) through the action of specific reductase enzymes. The ammonia thus formed is then used to synthesize amino acids, proteins, nucleic acids, and other nitrogen-containing compounds necessary for plant growth. Simplified Pathway: NO₃⁻ → NO₂⁻ → NH₃ → Amino acids → Proteins

Question 3721

India's first atomic power station was set up at:

ASurat (Gujarat)

BTarapur (Maharashtra)

CTrombay (Maharashtra)

DTrombay (Maharashtra)

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B. Tarapur (Maharashtra)Explanation not yet available.

Question 3720

Which of the following is a non metal that remains liquid at room temperature?

APhosphorous

BBromine

CChlorine

DHelium

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B. BromineExplanation not yet available.

Question 3719

One kilometre is equal to how many miles?

A0.84

B0.5

C1.6

D0.62

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D. 0.62Explanation not yet available.

Question 3718

Which type of fire extinguisher is used for petroleum fire?

APowder type

BLiquid type

CSoda acid type

DFoam type

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A. Powder typeExplanation not yet available.

Question 3717

The hottest part of the gas flame is known as:

Aluminous zone

Bdark zone

Cblue zone

Dnon-luminous zone

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D. non-luminous zoneExplanation not yet available.

Question 3712

The salinity of the sea water is:

A1.5 %

B2.5 %

C3.5 %

D4.5 %

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C. 3.5 %Explanation not yet available.

Question 3708

The pigment which is responsible for blood clotting is:

AFibrinogen

BHaemoglobin

CGlucose

DBlood Cells

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A. FibrinogenExplanation: Fibrinogen is a soluble plasma protein produced by the liver. During blood clotting, it is converted into insoluble fibrin threads by the enzyme thrombin. These fibrin threads form a mesh that traps red blood cells and platelets, creating a stable clot to stop bleeding. This process prevents excessive blood loss during injury and is regulated by clotting factors and platelets. Simplified Reaction: Fibrinogen → (Thrombin) → Fibrin → Blood Clot

Question 3707

Which among the following diseases are not bacterial?

ACholera and Diphtheria

BMalaria and trichomonasis

CTetanus and typhoid

DTuberculosis and leprosy

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C. Tetanus and typhoidExplanation: Malaria and Trichomoniasis are both protozoan diseases, not bacterial. Malaria is caused by Plasmodium species (transmitted by female Anopheles mosquitoes), while Trichomoniasis is caused by Trichomonas vaginalis, a sexually transmitted protozoan infection. Unlike bacterial diseases, these are treated using antiprotozoal drugs rather than antibiotics.

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Science

In which year was the "@" chosen for its use in e-mail addresses?

Plants absorb dissolved nitrates from soil and convert them into:

India's first atomic power station was set up at:

Which of the following is a non metal that remains liquid at room temperature?

One kilometre is equal to how many miles?

Which type of fire extinguisher is used for petroleum fire?

The hottest part of the gas flame is known as:

The salinity of the sea water is:

The pigment which is responsible for blood clotting is:

Which among the following diseases are not bacterial?

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