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Question 2523

As per Bureau of Indian Standards (BIS) for drinking water acceptable limit for total hardness as CaCO3 is

A100 mg/l

B200 mg/l

C300 mg/l

DNone of these

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B. 200 mg/lExplanation: According to the Bureau of Indian Standards (BIS) – IS 10500:2012, the acceptable limit of total hardness in drinking water, expressed as CaCO₃, is 200 mg/l. The permissible limit in the absence of an alternate source is up to 600 mg/l. Excess hardness can cause scaling and affect the taste of water.

Question 2522

To get an image, larger than object, one can use

AConvex mirror

BConcave mirror

CPlane mirror

DPlano Convex mirror

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B. Concave mirrorExplanation: A concave mirror can produce an image that is larger than the object when the object is placed between the mirror’s pole and its focal point. This property makes concave mirrors useful in applications like shaving mirrors and makeup mirrors, where magnified images are needed.

Question 2521

What is 'Agent Orange' ?

AAn insecticide

BA herbicide

CA fertiliser

DA biofertiliser

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B. A herbicideExplanation: Agent Orange is a powerful herbicide and defoliant chemical used by the U.S. military during the Vietnam War to destroy forest cover and crops. It contained harmful dioxins that caused severe environmental damage and long-term

Question 2520

Parasites which initiate production of antibodies within hosts are termed as

AHomoparasites

BZooparasites

CPathogenic parasites

DEndoparasies

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C. Pathogenic parasitesExplanation: Pathogenic parasites are those that invade the host’s body and cause disease. The presence of these harmful organisms stimulates the host’s immune system to produce antibodies that help neutralize or destroy the pathogens. Examples include Plasmodium (causes malaria) and Trypanosoma (causes sleeping sickness).

Question 2519

Right to clean environment is guaranteed in Indian Constitution by

AArticle 21

BArticle 19

CArticle 25

DArticle 14

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A. Article 21Explanation not yet available.

Question 2518

Peaty soil is found more in

AGujarat

BMaharashtra

CUttar Pradesh

DKerala

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D. KeralaExplanation not yet available.

Question 2517

'Mesothelioma' is caused by toxicity of

AArsenic

BLead

CMercury

DAsbestos

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D. AsbestosExplanation: Asbestos is a group of naturally occurring fibrous silicate minerals once widely used in construction and insulation. When inhaled, asbestos fibers accumulate in the lungs and pleura, leading to inflammation and scarring over years. This chronic exposure can cause asbestosis (lung fibrosis) and mesothelioma — a deadly cancer of the membrane lining the lungs (pleura) or abdomen (peritoneum).

Question 2516

Intestinal bacteria synthesizes which vitamin in the human body?

AVitamin A

BVitamin C

CVitamin D

DVitamin K

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D. Vitamin KExplanation: Vitamin K is produced by gut bacteria (Escherichia coli) in the large intestine. It plays a vital role in the synthesis of prothrombin, a protein essential for normal blood clotting. Although some of it is obtained from food (like leafy vegetables), intestinal bacteria supply a significant portion of the body’s requirement.

Question 2515

Sugarcane is a type of

Acreeper

Bshrub

Cgrass

Dtree

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C. grassExplanation: Sugarcane (Saccharum officinarum) is a tall, jointed, perennial grass belonging to the family Poaceae. It has thick stems rich in sucrose, which is extracted to produce sugar. The plant reproduces mainly through stem cuttings (vegetative propagation). Its structure and growth habit are similar to other grasses like maize and bamboo.

Question 2514

Which wave is being used by common TV remote control ?

ARadio waves

BMicro waves

CInfrared waves

DUltrasonic waves

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C. Infrared wavesExplanation not yet available.

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As per Bureau of Indian Standards (BIS) for drinking water acceptable limit for total hardness as CaCO3 is

To get an image, larger than object, one can use

What is 'Agent Orange' ?

Parasites which initiate production of antibodies within hosts are termed as

Right to clean environment is guaranteed in Indian Constitution by

Peaty soil is found more in

'Mesothelioma' is caused by toxicity of

Intestinal bacteria synthesizes which vitamin in the human body?

Sugarcane is a type of

Which wave is being used by common TV remote control ?

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