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Question 3874

An endoscope is used by a physician to view the internal parts of a body organ. It is based on the principle of:

Arefraction of light

Breflection of light

Ctotal internal reflection of light

Ddispersion of light

Show answer

C. total internal reflection of lightExplanation: An endoscope works on the principle of total internal reflection of light. It uses optical fibers to transmit light into the body and carry the reflected image back to the observer. This allows physicians to view internal organs without surgery.

Question 3873

A piece of ice is foating in a beaker containing water. When whole of the ice melts:

Athe level of water will come down.

Bthe level of water will come up.

Cthe level of water will first rise and then fall.

Dthe level of water will remain the same.

Show answer

D. the level of water will remain the same.Explanation: When ice floats in water, it displaces an amount of water equal to the weight of the ice. As the ice melts, it converts into the same amount of water, exactly filling the displaced volume. Therefore, the water level remains unchanged after all the ice melts.

Question 3872

A man inside a moving train tosses a coin, the coin falls behind him. The train is moving:

Aforward with a uniform speed

Bbackward with a uniform speed

Cforward with deceleration

Dforward with acceleration

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D. forward with accelerationExplanation: When a man inside a moving train tosses a coin and it falls behind him, it means the train is moving forward with acceleration. The coin, after being tossed, continues to move with the train’s initial velocity, but since the train speeds up, the coin appears to fall backward relative to the man.

Question 3871

A fan produces a feeling of comfort during hot weather because:

Afan supplies cool air

Bour body radiates more heat in air

Cconductivity of air increases

Dour perspiration evaporates rapidly

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D. our perspiration evaporates rapidlyExplanation: A fan provides a feeling of comfort during hot weather because it increases the rate of evaporation of sweat from our skin. As the perspiration evaporates rapidly due to moving air, it absorbs heat from the body, producing a cooling effect and making us feel more comfortable.

Question 3870

Rainbow is formed due to a combination of:

Arefraction and absorption

Bdispersion and diffraction

Crefraction and scattering

Ddispersion and total internal reflection

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D. dispersion and total internal reflectionExplanation: A rainbow is formed due to the dispersion of sunlight into its constituent colors and total internal reflection inside water droplets in the atmosphere. The light entering a droplet is refracted, reflected internally, and then refracted again as it exits, producing the beautiful spectrum of colors.

Question 3869

What does the term Dolby B or Dolby C printed on tape recorders and other sound systems refer to?

Afrequency modulated system

Bamplitude modulated system

Cnoise reduction circuit

Dboth DC and AC power can be used

Show answer

C. noise reduction circuitExplanation: The terms Dolby B and Dolby C refer to noise reduction circuits used in tape recorders and sound systems. These technologies reduce background hiss and unwanted noise during playback and recording, thereby improving the overall sound quality.

Question 3868

When a ship ?oats on water:

Ait displaces no water

Bthe mass of water displaced is equal to themass of the ship

Cthe mass of water displaced is lesser than themass of the ship

Dthe mass of water displaced is greater thanthe mass of the ship

Show answer

B. the mass of water displaced is equal to themass of the shipExplanation: When a ship floats on water, it displaces a volume of water whose mass is equal to the mass of the ship. This is in accordance with Archimedes’ Principle, which states that an object floats when the buoyant force (equal to the weight of displaced fluid) balances its own weight.

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

Show answer

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

Show answer

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).

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Science

An endoscope is used by a physician to view the internal parts of a body organ. It is based on the principle of:

A piece of ice is foating in a beaker containing water. When whole of the ice melts:

A man inside a moving train tosses a coin, the coin falls behind him. The train is moving:

A fan produces a feeling of comfort during hot weather because:

Rainbow is formed due to a combination of:

What does the term Dolby B or Dolby C printed on tape recorders and other sound systems refer to?

When a ship ?oats on water:

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:

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