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Question 2610

The exit of food from the stomach is regulated by which muscle

Acardiac

Bsphincter

Cskeletal

DNone of these

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B. sphincterExplanation: The pyloric sphincter is a circular band of smooth muscle located at the junction of the stomach and the duodenum (first part of the small intestine). It regulates the passage of partially digested food (chyme) from the stomach into the small intestine and prevents backflow. The cardiac sphincter, by contrast, controls food entry into the stomach from the esophagus.

Question 2607

The red planet is

AVenus

BSaturn

CMars

DNeptune

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C. MarsExplanation: Mars is known as the Red Planet because its surface contains a large amount of iron oxide (rust), which gives it a reddish appearance. It is the fourth planet from the Sun and has two moons — Phobos and Deimos.

Question 2606

Humidity is a measure of

Apressure in the air

Bviscosity of the air

Cair resistance

Dmoisture in air

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D. moisture in airExplanation: Humidity is a measure of the amount of water vapour (moisture) present in the air. It indicates how saturated the air is with moisture and affects weather, comfort, and precipitation. High humidity means the air contains more water vapour, while low humidity indicates dry air.

Question 2605

Which among the following is respiratory pigment in human beings?

AMelanin

BHaemoglobin

CRhodopsin

DBilirubin

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B. HaemoglobinExplanation: Haemoglobin is a complex iron-containing protein found in red blood cells (RBCs). It binds with oxygen in the lungs to form oxyhaemoglobin and releases it in tissues where oxygen levels are low. It also helps transport carbon dioxide from tissues back to the lungs. This oxygen-carrying property makes haemoglobin the essential respiratory pigment in humans and most vertebrates.

Question 2602

Which of the following is an example of thermoplastics?

ABakelite

BMelamine

CPVC

Dnone of these

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C. PVCExplanation: PVC (Polyvinyl Chloride) is an example of a thermoplastic. Thermoplastics soften on heating and can be reshaped multiple times without undergoing any chemical change. In contrast, Bakelite and Melamine are thermosetting plastics that become hard and rigid after heating and cannot be remolded.

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 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).

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Science

The exit of food from the stomach is regulated by which muscle

The red planet is

Humidity is a measure of

Which among the following is respiratory pigment in human beings?

Which of the following is an example of thermoplastics?

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

'Mesothelioma' is caused by toxicity of

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