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Question 3864

The sun is seen before the actual sunrise because of:

Arefection

Brefraction

Cscattering of light

Drectilinear propagation of light

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B. refractionExplanation: The Sun is seen a few minutes before actual sunrise and after actual sunset due to the refraction of light by the Earth's atmosphere. The atmosphere bends the Sun’s rays towards the Earth, making the Sun appear slightly above the horizon even when it is below it.

Question 3863

Hydro?uoric acid is not kept in glass bottles because it reacts with:

Avisible light

Bsodium oxide of glass

Caluminium oxide of glass

Dsilicon dioxide of glass

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D. silicon dioxide of glassExplanation not yet available.

Question 3862

Sodium stearate is a salt and is used?

Ain gunpowder

Bin Paint

Cto make Soap

Dto make fertilizer

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C. to make SoapExplanation not yet available.

Question 3861

Which of the following copper alloys is used for the manufacture of springs and suspension filaments in electrical instruments?

ABronze

BAluminium bronze

CGerman silver

DPhosphor bronze

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D. Phosphor bronzeExplanation not yet available.

Question 3860

What does the airbag, used for safety of car driver, contain?

ASodium bicarbonate

BSodium azide

CSodium nitrite

DSodium peroxide

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B. Sodium azideExplanation not yet available.

Question 3859

Living in the atmosphere of CO is dangerous because it:

AReduces organic matter of tissues

BDries up the blood

CCombined with O2 present inside to formCO2

DCombines with haemoglobin and makes itincapable of absorbing oxygen

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D. Combines with haemoglobin and makes itincapable of absorbing oxygenExplanation: Carbon monoxide (CO) is a colorless, odorless, and highly poisonous gas. When inhaled, it competes with oxygen for binding sites on the haemoglobin molecule in red blood cells. CO has approximately 200–250 times greater affinity for haemoglobin than oxygen. As a result, it forms a stable compound called carboxyhaemoglobin (HbCO). This compound prevents haemoglobin from carrying oxygen to body tissues, leading to oxygen deprivation (hypoxia). Prolonged exposure to CO can cause headache, dizziness, nausea, unconsciousness, and even death due to suffocation. Chemical Reaction: Hb + CO → HbCO (Carboxyhaemoglobin)

Question 3858

Domestic cooking gas consists of mostly:

AMethane and ethane

BLiquifed butane and isobutane

CEthylene and carbon monoxide

DHydrogen and acetylene

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A. Methane and ethaneExplanation not yet available.

Question 3857

Helium is preferred to hydrogen in air balloons because it:

Ais cheaper

Bis less dense

Chas greater lifting power

Ddoes not form an explosive mixture with air

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D. does not form an explosive mixture with airExplanation not yet available.

Question 3856

The only snake that builds its nest is:

AKrait

BKing cobra

CChain viper

DSaw scaled viper

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B. King cobraExplanation: The King Cobra (Ophiophagus hannah) is the world’s longest venomous snake and the only snake species that builds a nest to lay its eggs. The female collects leaves, twigs, and debris to construct a mound-like nest, usually near dense vegetation or fallen logs. She lays about 20–40 eggs in the nest and guards them aggressively until they hatch, showing remarkable parental care — a rare behavior among reptiles. Once the eggs are about to hatch, the female leaves the nest to avoid eating her own offspring, as King Cobras are carnivorous and feed mainly on other snakes.

Question 3855

Cow milk is a rich source of:

AVitamin A

BVitamin B

CVitamin C

DVitamin D

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B. Vitamin BExplanation: Cow’s milk is a nutritionally rich food containing proteins, fats, carbohydrates, minerals, and vitamins. It is particularly rich in B-group vitamins, especially Vitamin B₂ (Riboflavin) and Vitamin B₁₂ (Cobalamin). These vitamins play crucial roles in maintaining healthy skin, eyesight, and the nervous system, as well as aiding in the formation of red blood cells. Note: While milk provides moderate amounts of Vitamin A and D, the natural content of Vitamin D is low, and milk is often fortified with Vitamin D to enhance its nutritional value.

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Science

The sun is seen before the actual sunrise because of:

Hydro?uoric acid is not kept in glass bottles because it reacts with:

Sodium stearate is a salt and is used?

Which of the following copper alloys is used for the manufacture of springs and suspension filaments in electrical instruments?

What does the airbag, used for safety of car driver, contain?

Living in the atmosphere of CO is dangerous because it:

Domestic cooking gas consists of mostly:

Helium is preferred to hydrogen in air balloons because it:

The only snake that builds its nest is:

Cow milk is a rich source of:

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