General Q&A for Class 12 · Page 121
5,215 free answers in General for Class 12 students, across CBSE, ICSE and State boards.
Question & Answer
Questions
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What books to study for board exams?
NCERT textbooks are the most important books for CBSE board exams.All board questions are strictly based on NCERT syllabus and content.Reference books can be used for practice, but NCERT should remain the primary source.Studying too many books can cause confusion and waste time.
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What are important questions for CBSE board exams 2025?
Important questions are those that test core concepts and frequently appear in exams.They often include definitions, explanations, numericals, and case-based questions.CBSE does not officially declare important questions, so full syllabus preparation is essential.Practicing previous year papers helps identify key topics.
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Are spellings and grammar marks deducted in language papers?
Yes, spellings and grammar are important in CBSE language papers such as English and Hindi.Minor mistakes may not cause heavy deductions, but repeated errors can reduce marks.Grammar, sentence structure, and clarity are evaluated under expression.Regular writing practice helps minimize mistakes and improve scores.
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Will CBSE give marks for just attempting questions?
CBSE does not award marks for merely attempting a question if the answer is completely incorrect.However, partial marks are awarded for correct steps, logic, or relevant explanations.This applies especially to subjects like Mathematics, Science, and Accountancy.Students are advised to attempt all questions meaningfully to maximize scoring.
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What is the CBSE board exam pattern 2025?
The CBSE board exam pattern 2025 focuses on conceptual understanding and application-based learning.Question papers include objective questions, short answers, long answers, and case-based questions.Internal assessments continue to play an important role alongside theory exams.The pattern encourages analytical thinking rather than rote memorization.
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How to download the CBSE date sheet online?
Downloading the CBSE date sheet online is simple and convenient. CBSE releases the official date sheet in PDF format on its digital platforms.Students should visit the official CBSE portal and look for examination-related announcements. The Class 10 and Class 12 date sheets are clearly mentioned.After opening the PDF, students should download and save it for reference. Printing the date sheet is also recommended.Schools may share the date sheet through circulars, but stud
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When are CBSE board exam dates released for Class 10/12?
CBSE board exam dates for Class 10 and Class 12 are usually released between December and early January. The date sheet is announced well before the exams so that students can plan their revision effectively.The board exams generally begin in February and continue till March or early April. Before releasing the date sheet, CBSE finalizes practical exams, internal assessments, and logistical arrangements.The early release of exam dates helps reduce stress and allows students to c
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Why is compost better than chemical fertilizers?
Compost is superior to chemical fertilizers in numerous ways, making it the preferred choice for sustainable agriculture and gardening. COMPREHENSIVE COMPARISON: 1. COST FACTOR Compost: FREE or very low cost Made from household waste (no purchase needed) One-time investment for vermicomposting setup (₹500-2000) Continuous production from kitchen waste Ave
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Can we add laminated paper in vermicompost pit? Why or why not?
NO, laminated (plastic-coated) paper should NEVER be added to vermicompost pits. This is one of the most important rules in vermicomposting. What is Laminated Paper? Laminated paper is regular paper coated with a thin layer of plastic (usually polyethylene or polypropylene) to make it: Water-resistant More durable Glossy and attractive Stain-resistant Common Examples of Laminated Pape
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What materials can be added to vermicompost pit?
Understanding what can and cannot be added is crucial for successful vermicomposting. MATERIALS YOU CAN ADD: 1. Kitchen Waste (Green Materials - Nitrogen-rich) Fruit Waste: Banana peels (worms love these!) Apple cores and peels Orange peels (in moderation - acidic) Mango peels Watermelon rinds (chopped) Grape stems Papaya peels Tip:</stron
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How long does it take to make vermicompost?
Vermicompost typically takes 3-6 weeks to mature, but the exact duration depends on multiple factors. Standard Timeline: Optimal Conditions: 3-4 weeks Average Conditions: 4-6 weeks Suboptimal Conditions: 6-8 weeks Week-by-Week Breakdown: Week 1: Worms adapt to new environment Begin feeding on softer materials Populati
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What is the gizzard in redworms? What is its function?
The gizzard is a specialized muscular organ in the digestive system of redworms that functions as a grinding mill for their food. Anatomical Details: Location and Structure: Located in the anterior (front) part of the worm's body Positioned after the esophagus and crop Muscular organ with thick, strong walls Lines with tough, hardened cuticle (protective layer) Wo
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What are redworms and why are they used in vermicomposting?
Redworms are a special type of earthworm that are nature's most efficient composting agents. Scientific Details: Scientific name:Eisenia fetida (most common), also Eisenia andrei Common names: Red wigglers, tiger worms, manure worms Appearance: 5-10 cm long, reddish-brown color with yellowish bands Lifespan: 1.5-2 years Why
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What is vermicomposting? Explain the process step by step
Vermicomposting is an advanced composting technique that uses redworms (earthworms) to convert organic waste into extremely high-quality manure called vermicompost. "Vermi" comes from the Latin word for "worm." Why Vermicomposting? 5-10 times faster than traditional composting Produces superior quality fertilizer Odorless process (when done correctly) Can be done indoors or outdoors Perfect for urban settings with limite
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What is composting? How is compost made?
Composting is the natural process of converting organic waste (plant and animal materials) into nutrient-rich manure through microbial decomposition. What is Compost? Compost is dark, crumbly, earthy-smelling material formed when organic waste decomposes. It's often called "black gold" by gardeners because of its high nutritional value for plants. How Compost is Made - Traditional Method: Step 1: Select Location
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What is the difference between biodegradable and non-biodegradable waste?
Here's a comprehensive comparison: Aspect Biodegradable Waste Non-Biodegradable Waste Definition Decomposes naturally through microbial action Cannot be broken down naturally Origin Plant and animal sources Synthetic/man-made materials Decompos
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What is non-biodegradable waste? Give 10 examples
Non-biodegradable waste includes materials that cannot be broken down naturally by biological processes. These materials persist in the environment for hundreds or even thousands of years, causing long-term pollution. 10 Examples of Non-Biodegradable Waste: Plastic bags (polythene) - Can take 500-1000 years to decompose Plastic bottles - Persist for 450+ years in the environment Styrofoam/thermoco
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What is biodegradable waste? Give 10 examples
Biodegradable waste consists of organic materials that can be broken down naturally by microorganisms (bacteria, fungi) into simpler, harmless substances. These materials decompose through biological processes and return to nature. 10 Examples of Biodegradable Waste: Vegetable and fruit peels - Decompose within 1-2 weeks Leftover cooked food - Breaks down in 5-7 days Tea leaves and coffee grounds<
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What happens if garbage is not removed regularly?
If garbage isn't removed regularly, several serious problems occur: Health Hazards: Rotting garbage produces foul, unbearable smells that make living conditions unpleasant Decomposing food waste becomes a breeding ground for harmful organisms like bacteria and fungi Creates ideal conditions for disease-carrying pests: flies, mosquitoes, cockroaches, and rats These pests spread di
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What is garbage? Explain with examples
Answer: Garbage refers to all waste materials or rubbish that we discard from our homes, schools, offices, and shops. It's called 'kooda' in Hindi. Common examples include: Kitchen waste: Fruit and vegetable peels, leftover cooked food, tea leaves, eggshells Packaging materials: Plastic bags, cardboard boxes, paper wrappers, tin cans, glass bottles Paper waste: Old newspa