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General Science MCQ Practice
Practice General Science questions with instant scoring, correct answer highlighting, detailed solutions and first-click AI explanation caching for missing explanations.
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Q. 1846
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Which of the following allow the electric current to pass through it ?
Correct answer: B. Graphite
- Why it conducts: Graphite has delocalized electrons in its layered structure, allowing easy movement of charge along the planes.
- Key concept: Electrical conductivity from delocalized (free) electrons in a crystal lattice.
- Why others donβt: Glass, rubber, and PVC are insulators with localized electrons; they resist current flow.
- Exam tip: Distinguish conductors vs insulators by bonding: metals/graphite conductors vs polymers/ glasses insulators.
Q. 1844
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Which of the following blood group is considered as Universal Donor ?
Answer: D
- Why: Type O blood has no A or B antigens on red cells, so it can be given to any patient without triggering A/B antigen reactions.
- Concept: Absence of A/B antigens enables universal donor for RBC transfusions (O negative is safest).
- Other options: AB is universal recipient, not donor; A, B have specific antigens that may conflict with recipients.
- Exam tip: Remember: Oβ β universal donor for RBCs; AB+ β universal recipient.
Q. 1843
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Which of the following is used in pencils ?
Correct option: A
- Graphite is used in pencils because it has a layered, soft structure that can leave marks on paper while being easy to break into a fine line.
- Key concept: carbon allotropes differ in properties; graphite is lubricating, opaque, and conducts electricity, making it ideal for writing.
- If a formula/idea is needed: graphite's structure allows layers to slide, forming a thin graphite layer on paper.
- Exam tip: remember the common misconception about "pencil lead" vs graphite.
- Why others are incorrect:
- Silicon is mainly a semiconductor.
- Charcoal is porous and not durable for writing cores.
- Phosphorus is highly reactive and not suitable for pencils.
Q. 1840
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What is the first artificial satellite to orbit Earth ?
Correct option: A
- Sputnik I was the first artificial satellite, launched by the Soviet Union on 4 October 1957 into Earth orbit. This made it the first human-made object to orbit Earth, marking the start of the Space Age. Key concept: orbit is a path around Earth due to gravity.
- Explorer I (1958) was the first US satellite, not the first overall.
- Vanguard I (1958) was the third to reach orbit and not the first.
- Discoverer I (1959) came later under the Corona program.
Q. 1826
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Which of the following colours is not seen in a
rainbow ?
Answer: D Brown
- Reason: A rainbow shows the visible spectrum (red, orange, yellow, green, blue, indigo, violet) due to refraction and dispersion of sunlight in raindrops. Brown is not a spectral color produced by dispersion.
- Key concept: Dispersion of light creates continuous colors; non-spectral colors like brown do not appear in a rainbow.
- Tip: If a color isnβt part of the rainbow spectrum, it wonβt appear in a natural rainbow.
- Why others are incorrect: Yellow, Green, Red are all part of the visible spectrum and appear in rainbows.
Q. 1803
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Running water is the source of:
Correct answer: A
- Why: Running water converts potential energy to kinetic energy and drives turbines to generate electricity.
- Key concept: Hydroelectric power (hydel) uses flowing water to produce power.
- Formula (brief): P β Ξ· Ο g h Q, where Ο is water density, g is gravity, h is head, Q is flow rate, Ξ· is efficiency.
- Why others are incorrect: Thermal, nuclear power rely on heat from fuels, not running water.
- Exam tip: Remember βhydroβ relates to water flow, often via a dam or river damper.
Q. 1777
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In India which is the most widely used form of renewable energy ?
Correct option: C
- Solar energy is the most widely used renewable energy in India due to abundant sunlight and rapid adoption of solar photovoltaic (PV) systems and solar thermal technology.
- Key concept: conversion of solar radiation into electricity or heat using PV cells or solar collectors.
- Brief formula/logic: none needed; capacity grows with solar irradiance and installed capacity (kW/kWh).
- Exam tip: Remember Indiaβs major push is solar under programs like βSOLAR POWERβ and declining costs drive uptake.
- Why others are not correct: Geothermal is limited regionally; hydro is significant but not as rapidly expanding as solar; thermal energy is not renewable.
Q. 1776
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In your opinion which of the following is due to ozone hole ?
Correct option: A β Increased UV radiation
- Key concept: The ozone layer absorbs most of the sunβs harmful UV-B radiation. A hole reduces this protection, raising surface UV.
- Reason: Ozone depletion β less UV absorption β more UV reaches Earth.
- Formula/numeric logic: UV flux increase is proportional to decrease in ozone column density (approx. ΞUV β 1/ΞO3).
- Exam tip: Remember: ozone hole is linked to UV exposure, not directly to acid rain or greenhouse effects.
Q. 1775
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In organic farming:
In organic farming, chemical fertilizers are not used. The correct practice relies on natural inputs and ecological methods to maintain soil health and nutrient availability.
- Why correct: Chemical fertilizers are synthetic and can degrade soil biology; organic farming substitutes with compost, manure, and biofertilizers to improve soil structure and nutrient cycling.
Q. 1774
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Ramsar Convention is for the conservation of:
Correct answer: D. Wetland
- The Ramsar Convention is an international treaty focused on the conservation and wise use of wetlands globally.
- Key concept: wetlands are areas saturated with water, hosting unique flora and fauna; conservation aims to protect biodiversity and ecosystem services.
- Why others are incorrect: A (Mountain), B (Grassland), C (Forest) are protected by other frameworks, not specifically by Ramsar.
- Exam tip: Remember βRamsar = Wetlandsβ as a direct association to avoid mislinking with other ecosystems.
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