🔥 3 MOST IMPORTANT 1 MARK QUESTIONS from Surface Area & Volume | Class 10 | 2025

🔥 3 MOST IMPORTANT 1 MARK QUESTIONS from Surface Area & Volume | Class 10 Maths 2025 | CBSE Board Preparation"

Welcome to Desire Maths Classes, your one-stop destination for Class 10 Maths CBSE Board Exam Preparation 2025!
In this video, we’re covering the 3 MOST IMPORTANT 1 MARK QUESTIONS from Chapter 12 – Surface Area and Volume (NCERT Book) — short, scoring, and repeatedly asked in previous board exams!

💡 In just 6 minutes, you’ll understand each question step by step — along with proper formula usage, key tricks, and how to write the perfect answer for board exams.
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🧮 Questions Explained in This Video:

Q1️⃣ Volumes of two spheres are in the ratio 64 : 27.
👉 Find the ratio of their surface areas.
📘 Concept: Relation between radius, volume, and surface area of spheres.
💯 Trick: Surface area ∝ r², Volume ∝ r³ → Find ratio using cube roots easily.
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Q2️⃣ A medicine capsule is in the shape of a cylinder with two hemispherical ends.
👉 Diameter = 0.5 cm, Total length = 2 cm.
🧠 Find: Capacity (volume) of the capsule.
📘 Concept: Combination of solids — Volume of cylinder + Volume of two hemispheres.
💯 Board Tip: Always use correct units (cm³) and precise π value (3.14 or 22/7).
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Q3️⃣ Twelve identical solid spheres are made by melting a solid metallic cylinder.
👉 Cylinder base diameter = 2 cm, height = 16 cm.
👉 Find the diameter of each sphere.
📘 Concept: Volume of melted metal = Volume of new solids.
💯 Formula used:
πr₁²h₁ = 12 × 4/3 πr₂³
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⏱ Video Timeline

00:00 – Intro (Desire Maths Classes)
00:04 – Question 1 (Ratio of Surface Areas)
02:04 – Question 2 (Medicine Capsule Volume)
04:40 – Question 3 (Melting Cylinder into Spheres)
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📈 What You’ll Learn:

✅ Shortcut tricks for quick 1-mark question solving
✅ Perfect NCERT-based explanation
✅ Real CBSE Board 2025-style answers
✅ Surface Area & Volume formula revision
✅ How to avoid silly mistakes in board exam
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📘 Topics Covered in Chapter 12 – Surface Area & Volume:

Cube and Cuboid

Cylinder

Cone

Sphere and Hemisphere

Frustum of Cone

Combination of Solids

Volume and Surface Area Formulas

Conversion between solids
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🧠 Why You Should Watch This Video:

✔ Covers highly probable CBSE Board 2025 questions
✔ Step-by-step visual explanation with diagrams
✔ Designed for quick last-minute revision
✔ Based on NCERT, RD Sharma, and Exemplar
✔ Best for both concept clarity and exam practice
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📚 Channel Info – Desire Maths Classes:

We help Class 9 & 10 CBSE students learn Maths with ease and confidence.
📍 Short tricks, NCERT + Exemplar + RD Sharma solutions
📍 Daily MCQs, Shorts, and Full Chapter Series
📍 Board Exam Preparation 2025
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🔖 Tags

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