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Question 1554

The largest artery in human body is:

AAorta

BCapillary

CVena cava

DPulmonary vein

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A. AortaThe aorta is the largest artery in the human body. It originates from the left ventricle of the heart and distributes oxygenated blood to all parts of the body through its various branches. The aorta has thick, elastic walls that can withstand the high pressure of blood pumped directly from the heart. It is divided into parts such as the ascending aorta, aortic arch, and descending aorta. Other options (for context) Capillary: The smallest blood vessels where exchange of gases and nutrients occurs. Vena cava: The largest vein, not an artery; it carries deoxygenated blood back to the heart. Pulmonary vein: Carries oxygenated blood from the lungs to the heart but is not the largest vessel.

Question 1552

Who discovered Electron?

AEnrico Fermi

BRobert Noyce

CJ.J.Thomson

DJames Dyson

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C. J.J.ThomsonThe electron was discovered by J. J. Thomson in 1897 during his experiments with cathode rays. He demonstrated that cathode rays are composed of tiny negatively charged particles, which he named electrons. This discovery revolutionized atomic theory and led to the development of the plum pudding model of the atom, where electrons are embedded in a positively charged sphere. Other options (for context) Enrico Fermi: Known for his work on nuclear physics and the development of the first nuclear reactor. Robert Noyce: Co-inventor of the integrated circuit (microchip). James Dyson: Inventor of the modern vacuum cleaner, not a physicist.

Question 1548

Who invented Dynamite?

AJ B Dunlop

BAlfred Nobel

CJames Simons

DPeter Hargreaves

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B. Alfred NobelDynamite was invented by Alfred Nobel in 1867. He was a Swedish chemist, engineer, and industrialist who discovered that nitroglycerin could be stabilized by mixing it with an absorbent material like diatomaceous earth, making it safer to handle and transport. This invention revolutionized the mining and construction industries. In his later years, Alfred Nobel established the Nobel Prizes using the wealth he accumulated from his inventions. Other options (for context) J. B. Dunlop: Invented the pneumatic rubber tyre. James Simons: A mathematician and hedge fund manager, not an inventor. Peter Hargreaves: Not related to any major scientific invention; possibly confused with James Hargreaves, who invented the Spinning Jenny.

Question 1547

Which of the following trees shed their leaves once in a year?

ADeciduous trees

BConiferous trees

CEvergreen trees

DBoth deciduous and coniferous trees

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A. Deciduous treesDeciduous trees are those that shed all their leaves once a year, usually during the dry or winter season to conserve water and energy. After a period of dormancy, they grow new leaves at the beginning of the next growing season. Common examples include teak, sal, neem, and peepal. This adaptation helps the trees survive unfavorable climatic conditions. Other options (for context) Coniferous trees: Mostly evergreen and do not shed all their leaves at once; examples include pine and deodar. Evergreen trees: Retain their leaves throughout the year and shed them gradually. Both deciduous and coniferous trees: Incorrect — only deciduous trees completely shed their leaves annually.

Question 1546

Gravitational force is maximum at which of the following place?

AAt equator

BAt tropic of cancer

CAt tropic of Capricorn

DAt poles

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D. At polesThe gravitational force of the Earth is maximum at the poles and minimum at the equator. This happens because the Earth is not a perfect sphere; it is slightly flattened at the poles and bulged at the equator due to its rotation. The distance from the center of the Earth to the poles is slightly less than that to the equator, resulting in a stronger gravitational pull at the poles. Other options (for context) At equator: Gravity is slightly weaker because of the Earth's bulge and centrifugal force due to rotation. At tropic of cancer: Gravity here is intermediate, not maximum. At tropic of Capricorn: Same as the Tropic of Cancer — gravity is moderate, not maximum.

Question 1541

Red data book contains data of which of the following?

AAll plant species

BAll animal species

CAll endangered species

DAll extinct species

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C. All endangered speciesThe Red Data Book contains information about endangered and threatened species of plants and animals. It is published by the International Union for Conservation of Nature (IUCN). The book categorizes species based on their risk of extinction, such as Critically Endangered, Endangered, Vulnerable, and Extinct. It serves as a global reference for monitoring biodiversity conservation and guiding environmental protection policies. Other options (for context) All plant species: Incorrect — it includes only those plants that are endangered or threatened. All animal species: Incorrect — it covers only the endangered and vulnerable ones, not all animals. All extinct species: Incorrect — it includes species at risk of extinction, not only those already extinct.

Question 1540

Which of the following is an Inert Gas?

AHydrogen

BNitrogen

COxygen

DArgon

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D. ArgonArgon (Ar) is an inert gas, also known as a noble gas. It belongs to Group 18 of the periodic table, whose elements are characterized by complete outer electron shells, making them chemically unreactive. Argon constitutes about 0.93% of the Earth's atmosphere and is widely used in electric bulbs, welding, and in creating inert environments for chemical reactions. Other options (for context) Hydrogen: Highly reactive and combustible gas. Nitrogen: Relatively less reactive but not inert; forms compounds like ammonia. Oxygen: Highly reactive gas essential for combustion and respiration.

Question 1539

Which of the following micro-organism causes diseases like polio and chicken pox?

ABacteria

BProtozoa

CAlgae

DVirus

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D. VirusDiseases like Polio and Chicken Pox are caused by viruses. The Polio virus attacks the nervous system and can lead to paralysis, while the Varicella-zoster virus causes Chicken Pox, characterized by itchy blisters and fever. Viruses are acellular infectious agents that can reproduce only inside the living cells of a host organism. Other options (for context) Bacteria: Cause diseases like tuberculosis, cholera, and typhoid, not polio or chicken pox. Protozoa: Cause diseases such as malaria and amoebiasis. Algae: Generally non-pathogenic; they do not cause human diseases like polio or chicken pox.

Question 1536

Which instrument is used for measuring humidity of atmosphere?

ABarometer

BAnemometer

CThermometer

DHygrometer

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D. HygrometerA Hygrometer is an instrument used to measure the humidity (moisture content) in the atmosphere. It helps determine the percentage of water vapor present in the air, which is essential for weather forecasting, climate studies, and maintaining controlled environments in industries or laboratories. Some common types include the dry and wet bulb hygrometer and the digital hygrometer. Other options (for context) Barometer: Used to measure atmospheric pressure. Anemometer: Used to measure wind speed. Thermometer: Used to measure temperature.

Question 1534

When iron rusts, its weight __________

Adecreases

Bincreases

Cremains the same

Dfirst increases and then decreases

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B. increasesWhen iron rusts, its weight increases. This is because rusting is a chemical reaction between iron, oxygen, and moisture from the air, forming hydrated iron(III) oxide (Fe₂O₃·xH₂O). During this process, oxygen atoms from the air combine with the iron, adding extra mass to the metal surface in the form of rust. However, while the weight increases, the structural strength of the iron decreases due to corrosion. Other options (for context) Decreases: Incorrect — mass increases due to the addition of oxygen. Remains the same: Incorrect — oxygen from air chemically adds to iron, increasing total mass. First increases and then decreases: Not applicable — in normal rusting, weight continues to increase until the surface flakes off.

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Science

The largest artery in human body is:

Who discovered Electron?

Who invented Dynamite?

Which of the following trees shed their leaves once in a year?

Gravitational force is maximum at which of the following place?

Red data book contains data of which of the following?

Which of the following is an Inert Gas?

Which of the following micro-organism causes diseases like polio and chicken pox?

Which instrument is used for measuring humidity of atmosphere?

When iron rusts, its weight __________

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