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Question 1679

According to ISRO, Chandrayaan-2 moon mission will explore which area of the moon ?

AMoon North Pole

BMoon South Pole

CMoon North-West part

DUnexplored part of the Moon

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B. Moon South PoleChandrayaan-2, launched by the Indian Space Research Organisation (ISRO) on 22 July 2019, was designed to explore the South Pole region of the Moon. This area is of great scientific interest because it is permanently shadowed and may contain water ice and other valuable minerals. The mission included an orbiter, a lander (Vikram), and a rover (Pragyan), making it India’s first attempt at a soft landing on the lunar surface near the south pole. Other options (for context) Moon North Pole: Not the target area of Chandrayaan-2. Moon North-West part: Incorrect — Chandrayaan-2 focused specifically on the South Pole. Unexplored part of the Moon: Partly true, but specifically, the unexplored South Pole region was chosen.

Question 1608

Sericuluture is a rearing practice of :

AFishes

BSilk worm

CHoney bees

DEarth worm

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B. Silk wormSericulture is the rearing and cultivation of silkworms for the production of silk. The process involves raising silkworms on mulberry leaves, harvesting their cocoons, and then extracting silk fibers from these cocoons. The most commonly used silkworm species is Bombyx mori. Sericulture is an important cottage industry in countries like India, China, and Japan. Other options (for context) Fishes: Their rearing is called Pisciculture. Honey bees: Their rearing is called Apiculture. Earth worms: Their cultivation for composting is called Vermiculture.

Question 1604

Which gas is used as fire extinguisher?

ANitrogen dioxide

BCarbon monoxide

CCarbon dioxide

DNitrous oxide

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C. Carbon dioxideCarbon dioxide (CO₂) is commonly used as a fire extinguisher gas. It works by displacing oxygen around the fire and forming a blanket of gas that cuts off the oxygen supply, thereby stopping the combustion process. Additionally, CO₂ is non-flammable and leaves no residue, making it ideal for use on electrical and electronic fires where water cannot be used safely. Other options (for context) Nitrogen dioxide (NO₂): A toxic gas, not suitable for firefighting. Carbon monoxide (CO): A poisonous gas produced by incomplete combustion, not used in extinguishers. Nitrous oxide (N₂O): Commonly known as laughing gas, used as an anesthetic, not a fire suppressant.

Question 1577

Isaac Newton invented:

AThermometer

BReflecting Telescope

CHydraulic Accumulator

DTransistor

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B. Reflecting TelescopeSir Isaac Newton invented the Reflecting Telescope in 1668. Unlike earlier refracting telescopes that used lenses, Newton’s design used a concave mirror to reflect and focus light. This eliminated chromatic aberration (color distortion) caused by lenses and significantly improved image clarity. Newton’s reflecting telescope became a major advancement in astronomical observation. Other options (for context) Thermometer: Invented by Galileo Galilei (early version) and later improved by Daniel Gabriel Fahrenheit. Hydraulic Accumulator: Invented by William Armstrong. Transistor: Invented much later (in 1947) by John Bardeen, William Shockley, and Walter Brattain.

Question 1575

Blood Circulation was discovered by?

AMary Anderson

BWilliam Harvey

CVirginia Apgar

DRobert Feulgen

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B. William HarveyWilliam Harvey, an English physician, discovered the process of blood circulation in 1628. He demonstrated that the heart acts as a pump to circulate blood continuously throughout the body via a closed system of arteries and veins. His work, published in "De Motu Cordis" (On the Motion of the Heart and Blood), laid the foundation for modern cardiovascular physiology. Other options (for context) Mary Anderson: Invented the windshield wiper, not related to medicine. Virginia Apgar: Developed the Apgar score for assessing newborn health. Robert Feulgen: Discovered a staining technique for DNA, not blood circulation.

Question 1573

The pale yellow colour of urine is due to the presence of which pigment?

AUrophyll

BUrochrome

CChlorophyll

DChloroplast

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B. UrochromeThe pale yellow colour of urine is due to the presence of the pigment Urochrome. Urochrome is a waste product formed from the breakdown of hemoglobin in red blood cells. It is produced when hemoglobin is metabolized into urobilin and then excreted through urine. The intensity of the yellow color can vary depending on hydration levels — darker urine indicates dehydration, while pale urine indicates proper hydration. Other options (for context) Urophyll: No such pigment exists in human physiology. Chlorophyll: Green pigment found in plants, not in urine. Chloroplast: Cell organelle in plants where photosynthesis occurs, not a pigment.

Question 1571

Human beings hearing range is:

A30 to 30,000 Hz

B50 to 50,000 Hz

C20 to 20,000 Hz

D40 to 40,000 Hz

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C. 20 to 20,000 HzThe normal hearing range of human beings is from 20 Hz to 20,000 Hz (20 kHz). Sounds below 20 Hz are called infrasonic sounds, while those above 20,000 Hz are known as ultrasonic sounds, both of which are inaudible to humans. With age or prolonged exposure to loud noise, the upper hearing limit tends to decrease, reducing sensitivity to high-frequency sounds. Other options (for context) 30 to 30,000 Hz: Incorrect — exceeds the upper audible limit for humans. 50 to 50,000 Hz: Incorrect — animals like dogs and bats can hear this range, not humans. 40 to 40,000 Hz: Incorrect — the human ear cannot detect frequencies that high.

Question 1568

Who invented the contact lens?

AEnrico Fermi

BAdolf Gaston Eugen Fick

CSandford Fleming

DBenoit Fourneyron

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B. Adolf Gaston Eugen FickAdolf Gaston Eugen Fick, a German physiologist, invented the first successful contact lens in 1888. His design consisted of a glass lens that covered the entire eye, resting on the sclera (the white part of the eye). Though bulky and uncomfortable by today’s standards, it laid the foundation for modern soft and gas-permeable contact lenses used in vision correction and cosmetics. Other options (for context) Enrico Fermi: Known for his work in nuclear physics and development of the first nuclear reactor. Sandford Fleming: Introduced the concept of standard time zones. Benoit Fourneyron: Invented the water turbine, not related to optics or vision correction.

Question 1565

Metrology is a science of:

AWheather

BMeasurement

CDistance

Dnone of these

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B. MeasurementMetrology is the science of measurement. It deals with the establishment of units of measurement, their standards, and the development of new measuring methods and instruments. Metrology ensures accuracy and consistency in measurements across scientific research, engineering, manufacturing, and trade. It is broadly classified into three types — scientific metrology, industrial metrology, and legal metrology. Other options (for context) Weather: The study of weather and atmosphere is called Meteorology, not Metrology. Distance: Measuring distance is just one aspect of metrology, not its entire scope. None of these: Incorrect — metrology specifically refers to measurement science.

Question 1564

Purity of milk is tested by:

AElectrometer

BLactometer

CRadiometer

DRefractometer

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B. LactometerThe purity of milk is tested using a Lactometer. It works on the principle of Archimedes’ principle and is used to measure the specific gravity (density) of milk. Pure milk has a specific gravity ranging between 1.026 and 1.032. If water or other substances are added, the density decreases, indicating adulteration. The lactometer thus helps determine whether the milk is pure or diluted. Other options (for context) Electrometer: Measures electric potential or charge, not related to milk testing. Radiometer: Measures radiant energy or light intensity. Refractometer: Used to measure refractive index, commonly for sugar solutions, not milk purity.

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Science

According to ISRO, Chandrayaan-2 moon mission will explore which area of the moon ?

Sericuluture is a rearing practice of :

Which gas is used as fire extinguisher?

Isaac Newton invented:

Blood Circulation was discovered by?

The pale yellow colour of urine is due to the presence of which pigment?

Human beings hearing range is:

Who invented the contact lens?

Metrology is a science of:

Purity of milk is tested by:

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