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Question 1765

A fuse wire has :

Ahigh resistance and high melting point

Blow resistance and high melting point

Clow resistance and low melting point

Dhigh resistance and low melting point

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D. high resistance and low melting pointA fuse wire has high resistance and a low melting point. It is made of materials like tin-lead alloy so that it melts quickly when excessive current flows through the circuit. This breaks the circuit and prevents damage to electrical appliances due to overheating or short circuits. High resistance: Causes heating when excess current passes.Low melting point: Ensures the fuse melts easily to interrupt the circuit.

Question 1764

In a society the growth and development that meets the current human needs and also conserves natural resources for future generations is known as:

AGreen economy

BHolistic development

CSustainable development

DSubsistence agriculture

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C. Sustainable developmentSustainable Development refers to growth that meets the needs of the present without compromising the ability of future generations to meet their own needs. It aims to balance economic progress, social equity, and environmental protection by conserving natural resources and reducing pollution for long-term ecological stability. Green economy: Focuses mainly on eco-friendly industries.Holistic development: Emphasizes overall human and social growth.Subsistence agriculture: Involves farming mainly for self-consumption.

Question 1763

A rocket functions on which of the following laws ?

ANewtons first law

BNewtons second law

CNewtons third law

DAll of the above

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C. Newtons third lawA rocket functions based on Newton’s Third Law of Motion, which states that “for every action, there is an equal and opposite reaction.” The rocket expels gases downward at high speed (action), and in response, the rocket is propelled upward (reaction). This principle enables space rockets to move even in the vacuum of space where no air resistance exists. Newton’s First Law: Deals with inertia, not propulsion.Newton’s Second Law: Explains force and acceleration but doesn’t directly describe rocket thrust.

Question 1762

Green Revolution is associated with:

AAgriculture

BSericulture

CFishery

DCultivation of bees

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A. AgricultureThe Green Revolution is associated with Agriculture. It refers to the period during the 1960s–70s when new technologies like high-yield variety (HYV) seeds, fertilizers, irrigation, and pesticides were introduced to boost food grain production, especially wheat and rice. It helped India achieve self-sufficiency in food production. Sericulture: Rearing of silkworms for silk.Fishery: Cultivation and harvesting of fish.Cultivation of bees: Known as apiculture, for honey production.

Question 1761

Which of the following is an anaesthetic gas ?

ANitrogen dioxide

BNitrous oxide

CNitric oxide

DNitrogen

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B. Nitrous oxideNitrous oxide (N₂O) is an anaesthetic gas, commonly known as laughing gas. It is used in dentistry and minor surgeries to induce mild anesthesia and relaxation. It acts quickly and wears off rapidly, making it safe for short medical procedures. Nitrogen dioxide: A toxic air pollutant, not used as anesthesia.Nitric oxide: A signaling molecule in the body, not an anesthetic.Nitrogen: An inert gas, does not induce anesthesia.

Question 1759

Which of the following statements is not correct ?

ASilver Revolution refers to increased pulse production.

BWhite Revolution refers to increased milk production.

CGreen Revolution refers to increased production of food grains.

DYellow Revolution refers to increased oil-seed production.

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A. Silver Revolution refers to increased pulse production.The statement “Silver Revolution refers to increased pulse production” is incorrect. The Silver Revolution actually refers to the rapid increase in egg and poultry production in India during the 1980s, which boosted nutrition and rural income. White Revolution: Increased milk production under Dr. Verghese Kurien.Green Revolution: Rise in food grain output (wheat, rice) using high-yield varieties.Yellow Revolution: Boosted oilseed production for self-sufficiency in edible oils.

Question 1758

The process in which living organisms are used to remove contaminants, pollution or other unwanted substances from soil or water is known as:

ABiotechnology

Bbioremediation

CBiodegradation

DBiomagnification

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B. bioremediationBioremediation is the process by which living organisms — mainly microbes, fungi, or plants — are used to remove or neutralize contaminants, pollutants, or toxins from soil, water, or air. These organisms break down harmful substances into less toxic or non-toxic forms, helping to clean up polluted environments naturally. It is an eco-friendly and cost-effective method for environmental restoration. Other options (for context) Biotechnology: A broader field involving the use of living systems for industrial, agricultural, or medical purposes. Biodegradation: The natural breakdown of organic materials by microorganisms, but not necessarily aimed at pollution cleanup. Biomagnification: The accumulation of toxic substances in the food chain, opposite of pollution removal.

Question 1757

Which of the following diseases is caused by H1N1, virus ?

ASwine flu

BDengue

CAIDS

DBird flu

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A. Swine fluSwine Flu is caused by the H1N1 virus, a subtype of the Influenza A virus. It primarily affects the respiratory system and is transmitted from person to person through droplets from coughs or sneezes. Symptoms include fever, cough, sore throat, body aches, and fatigue. The H1N1 pandemic in 2009 was declared a global health emergency by the World Health Organization (WHO). Other options (for context) Dengue: Caused by the Dengue virus, transmitted by Aedes mosquitoes. AIDS: Caused by the HIV (Human Immunodeficiency Virus), not H1N1. Bird flu: Caused by the H5N1 virus, not H1N1.

Question 1756

Green muffler is used against which type of pollution ?

AAir

BNoise

CSoil

DWater

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B. NoiseThe Green Muffler technique is used to control noise pollution. It involves planting dense rows of trees and shrubs around roads, industrial areas, and public places. The vegetation acts as a natural sound barrier by absorbing, deflecting, and refracting sound waves, thereby reducing the intensity of noise reaching nearby areas. Common plants used for green mufflers include Neem, Ashoka, Ficus, and Cassia. Other options (for context) Air pollution: Controlled by measures like emission filters and afforestation, but not directly by green mufflers. Soil pollution: Managed by waste treatment and reduced chemical use, not vegetation barriers. Water pollution: Controlled by sewage treatment and reducing industrial discharge, not by plants as mufflers.

Question 1755

Metals can be beaten into sheets, because:

Athey are ductile

Bthey are soft

Cthey are malleable

Dthe metal particles are loosely arranged

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C. they are malleableMetals can be beaten into thin sheets because they are malleable. Malleability is a physical property of metals that allows them to withstand hammering or rolling without breaking. This property is due to the metallic bonding where positive metal ions are surrounded by a ‘sea’ of delocalized electrons, allowing the layers of atoms to slide over each other without breaking the bond. Examples of highly malleable metals include gold, silver, and aluminium. Other options (for context) Ductile: Refers to the ability of metals to be drawn into wires, not beaten into sheets. Soft: Not true for all metals — many are hard yet malleable. Loosely arranged particles: Incorrect — metal atoms are closely packed in a lattice structure.

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Science

A fuse wire has :

In a society the growth and development that meets the current human needs and also conserves natural resources for future generations is known as:

A rocket functions on which of the following laws ?

Green Revolution is associated with:

Which of the following is an anaesthetic gas ?

Which of the following statements is not correct ?

The process in which living organisms are used to remove contaminants, pollution or other unwanted substances from soil or water is known as:

Which of the following diseases is caused by H1N1, virus ?

Green muffler is used against which type of pollution ?

Metals can be beaten into sheets, because:

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