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Question 3867

A car is moving on a road and rain is falling vertically. Select the correct answer:

AThe rain will strike the wind screen only

BThe rain will strike the front screen only

CThe rain will strike both the screens

DThe rain will not strike any of the screens

Show answer

B. The rain will strike the front screen onlyExplanation: When a car moves forward while rain is falling vertically, the rain appears to fall at an angle relative to the car’s motion. As a result, the raindrops strike the front windscreen of the car, not the rear screen. This is due to the relative velocity between the car and the falling rain.

Question 3866

When a sound wave goes from one medium to another, the quantity that remains unchanged is:

AFrequency

BAmplitude

CWavelength

DSpeed

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A. FrequencyExplanation: When a sound wave travels from one medium to another, its frequency remains unchanged. However, its wavelength and speed change depending on the properties of the new medium. The constant frequency ensures that the sound maintains the same pitch.

Question 3865

If a liquid is heated in space under no gravity, the transfer of heat will take place by process of:

Aconduction

Bconvection

Cradiation

Dcannot be heated in the absence of gravity

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C. radiationExplanation: In space, where there is no gravity, convection cannot occur because it depends on the movement of fluid due to gravity-induced density differences. Therefore, heat transfer in such conditions takes place only through radiation and conduction (within the liquid itself).

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

Show answer

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

Show answer

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.

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Explore the question bank

A car is moving on a road and rain is falling vertically. Select the correct answer:

When a sound wave goes from one medium to another, the quantity that remains unchanged is:

If a liquid is heated in space under no gravity, the transfer of heat will take place by process of:

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:

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