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Question 964

A radar which detect the presence of an aircraft in sky uses :

ASound waves

BRadio waves

CUltrasonic waves

DInfrared rays

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B. Radio wavesExplanation: RADAR (Radio Detection and Ranging) works by using radio waves to detect and determine the distance, speed, and position of objects such as aircraft, ships, and vehicles. The radar system transmits radio waves, which travel through the air, hit an object, and get reflected back to the radar receiver. By measuring the time delay between transmission and reception, the radar calculates the object's distance and motion. Radio waves are ideal because they can travel long distances, penetrate clouds, and are unaffected by weather conditions.

Question 963

LASER is abbreviated form of :

ALight Absorption by Stimulated Emission of Radiation

BLight Absorption by Steady Emission of Radiation

CLight Amplification by Stimulated Emission of Radiation

DLight Amplification by Steady Emission of Radiation

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C. Light Amplification by Stimulated Emission of RadiationExplanation: The term LASER stands for Light Amplification by Stimulated Emission of Radiation. A laser produces a highly coherent, monochromatic, and intense beam of light by amplifying light through the process of stimulated emission. In this process, atoms or molecules in an excited state emit photons in phase with incoming photons, resulting in a strong, directed beam. Lasers are widely used in medicine, communication, industry, defense, and scientific research.

Question 962

The colour of sky without atmosphere will be :

ABlack

BWhite

CBlue

DGreen

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A. BlackExplanation: The colour of the sky without an atmosphere would appear black. On Earth, the sky looks blue because molecules in the atmosphere scatter sunlight — a phenomenon called Rayleigh scattering. Shorter wavelengths of light (blue and violet) are scattered more than longer wavelengths (red). However, if there were no atmosphere to scatter sunlight, no light would be diffused in all directions, and the sky would appear completely dark or black, just as it does from the surface of the Moon or in outer space.

Question 961

Which one of the following allows sound waves to travel comparatively faster at 0°C ?

AWater

BAir

CIce

DIron

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D. IronExplanation: Sound waves travel fastest in solids, slower in liquids, and slowest in gases. This is because the speed of sound depends on the elasticity and density of the medium — it travels faster when particles are tightly packed and can transmit vibrations more efficiently. Among the options, iron (a solid) allows sound to travel much faster (around 5130 m/s) than in water (1500 m/s), ice (3200 m/s), or air (331 m/s at 0°C).

Question 960

The phenomenon involved in propagation of light waves throuhg optical fibres is :

ADispersion of light

BScattering of light

CTotal internal reflection of light

DRefraction of light

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C. Total internal reflection of lightExplanation: The transmission of light through optical fibres is based on the principle of Total Internal Reflection (TIR). When light travels from a denser medium (core of the fibre) to a rarer medium (cladding) and strikes the interface at an angle greater than the critical angle, it gets completely reflected back into the core instead of refracting out. This continuous internal reflection allows light to travel long distances through the fibre with minimal loss, even when the fibre is bent. Optical fibres are widely used in telecommunication, internet data transfer, and medical endoscopy.

Question 959

Alcohol contains :

Anitrogen, hydrogen, oxygen

Bcarbon, hydrogen, oxygen

Coxygen, carbon, nitrogen

Dhydrogen, chlorine, oxygen

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B. carbon, hydrogen, oxygenExplanation: Alcohols are organic compounds composed of carbon (C), hydrogen (H), and oxygen (O). They are characterized by the presence of one or more hydroxyl (-OH) functional groups attached to a carbon atom. The general formula of alcohols is CnH2n+1OH. A common example is ethanol (C₂H₅OH), which is used in beverages, fuels, and sanitizers. The -OH group makes alcohols polar, soluble in water (especially lower alcohols), and reactive in many organic reactions.

Question 958

Goverment of India had set up BEE, an autonomous Goverment Agency under Ministry of Power. BEE stands for:

ABureau of Energy Efficiency

BBureau of Electrical and Electronics

CBureau of Enhanced Energy

DBureau of Energy Emission

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A. Bureau of Energy EfficiencyExplanation: The Bureau of Energy Efficiency (BEE) is an autonomous government agency set up by the Government of India under the Ministry of Power in 2002. It was established under the provisions of the Energy Conservation Act, 2001. The primary objective of BEE is to promote policies and programs that increase the efficiency of energy use in various sectors of the economy. BEE also develops energy efficiency standards and labeling programs for appliances and buildings, such as the star-rating system seen on electrical devices.

Question 957

Which of the following will not cause any atmospheric pollution ?

AHydrogen

BSulphur dioxide

CCarbon dioxide

DCarbon monoxide

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A. HydrogenExplanation: Hydrogen (H₂) is a clean fuel that does not cause atmospheric pollution when burned. It combines with oxygen to produce water vapor (H₂O) as the only by-product, without emitting harmful gases like carbon monoxide (CO), carbon dioxide (CO₂), or sulphur dioxide (SO₂). Because of this, hydrogen is considered an eco-friendly and renewable energy source and is being promoted as the fuel of the future in hydrogen-powered vehicles and fuel cells.

Question 956

Heavy water is :

AIce

BWater at 4 degree Celsius

CDeuterium oxide

DSolution of sugar and water

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C. Deuterium oxideExplanation: Heavy water is chemically known as Deuterium oxide (D₂O). It is similar to ordinary water (H₂O), but the hydrogen atoms are replaced by deuterium — a heavier isotope of hydrogen containing one proton and one neutron. Heavy water is not suitable for drinking but is used as a moderator and coolant in nuclear reactors because it slows down neutrons, allowing a controlled nuclear fission reaction. It is also used in scientific research and isotope studies.

Question 955

Which of the following diseases is caused by virus ?

ACholera

BTyphoid

CTuberculosis

DSmall Pox

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D. Small PoxExplanation: Smallpox is a highly contagious and deadly disease caused by the Variola virus. It is characterized by high fever, fatigue, and a distinctive pustular rash on the skin. Smallpox was one of the most devastating diseases in human history, but thanks to the worldwide vaccination campaign led by the World Health Organization (WHO), it was officially eradicated in 1980. The vaccine for smallpox was first developed by Edward Jenner in 1796.

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Science

A radar which detect the presence of an aircraft in sky uses :

LASER is abbreviated form of :

The colour of sky without atmosphere will be :

Which one of the following allows sound waves to travel comparatively faster at 0°C ?

The phenomenon involved in propagation of light waves throuhg optical fibres is :

Alcohol contains :

Goverment of India had set up BEE, an autonomous Goverment Agency under Ministry of Power. BEE stands for:

Which of the following will not cause any atmospheric pollution ?

Heavy water is :

Which of the following diseases is caused by virus ?

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