{
  "title": "Surface Area of Cylinder (Mensuration) - Grade 8 ICSE",
  "total_questions": 60,
  "questions": [
    {
      "id": 1,
      "difficulty": "easy",
      "question": "🛢️ A cylinder has radius 7 cm and height 10 cm. Find its curved surface area. (π = 22/7) 🧮",
      "options": {
        "A": "440 cm²",
        "B": "220 cm²",
        "C": "660 cm²",
        "D": "880 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 2,
      "difficulty": "easy",
      "question": "📏 Cylinder radius = 3 cm, height = 5 cm. Curved surface area? (π = 3.14) 📐",
      "options": {
        "A": "94.2 cm²",
        "B": "47.1 cm²",
        "C": "141.3 cm²",
        "D": "188.4 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 3,
      "difficulty": "easy",
      "question": "🎯 Total surface area = curved + 2 × base area. If radius = 2 cm, height = 7 cm, find total SA. (π = 22/7) 🎯",
      "options": {
        "A": "113.14 cm²",
        "B": "88 cm²",
        "C": "100 cm²",
        "D": "125.14 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 4,
      "difficulty": "easy",
      "question": "🔵 CSA formula = 2πrh. If r=5, h=8, π=3.14, CSA = ? 🔵",
      "options": { "A": "251.2", "B": "125.6", "C": "502.4", "D": "62.8" },
      "correct_answer": "A"
    },
    {
      "id": 5,
      "difficulty": "easy",
      "question": "🧱 Find TSA of cylinder: r=1 cm, h=1 cm (π=3.14). Total? 🧱",
      "options": {
        "A": "12.56 cm²",
        "B": "6.28 cm²",
        "C": "18.84 cm²",
        "D": "3.14 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 6,
      "difficulty": "easy",
      "question": "🚰 Water tank r=0.7 m, h=1 m. Find CSA in m² (π=22/7). 🚰",
      "options": { "A": "4.4 m²", "B": "2.2 m²", "C": "8.8 m²", "D": "6.6 m²" },
      "correct_answer": "A"
    },
    {
      "id": 7,
      "difficulty": "easy",
      "question": "📦 Cylinder base radius 10 cm, height 21 cm. CSA? (π=22/7) 📦",
      "options": {
        "A": "1320 cm²",
        "B": "660 cm²",
        "C": "1980 cm²",
        "D": "2640 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 8,
      "difficulty": "easy",
      "question": "🎨 Paint can r=3.5 cm, h=10 cm. TSA? (π=22/7) 🎨",
      "options": {
        "A": "297 cm²",
        "B": "198 cm²",
        "C": "396 cm²",
        "D": "495 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 9,
      "difficulty": "easy",
      "question": "🥫 Can radius 7 cm, height 14 cm. Curved surface? (π=22/7) 🥫",
      "options": {
        "A": "616 cm²",
        "B": "308 cm²",
        "C": "924 cm²",
        "D": "1232 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 10,
      "difficulty": "easy",
      "question": "🔧 Pipe r=2.1 cm, h=50 cm. CSA? (π=22/7) 🔧",
      "options": {
        "A": "660 cm²",
        "B": "330 cm²",
        "C": "990 cm²",
        "D": "1320 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 11,
      "difficulty": "easy",
      "question": "🎈 Balloon shape cylinder r=14 cm, h=25 cm. TSA? (π=22/7) 🎈",
      "options": {
        "A": "3432 cm²",
        "B": "1716 cm²",
        "C": "5148 cm²",
        "D": "6864 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 12,
      "difficulty": "easy",
      "question": "📏 If radius doubles, CSA becomes? (height same) 📏",
      "options": { "A": "Double", "B": "Same", "C": "Half", "D": "Four times" },
      "correct_answer": "A"
    },
    {
      "id": 13,
      "difficulty": "easy",
      "question": "🛢️ r=0.5 m, h=2 m. CSA in m² (π=3.14)? 🛢️",
      "options": {
        "A": "6.28 m²",
        "B": "3.14 m²",
        "C": "12.56 m²",
        "D": "1.57 m²"
      },
      "correct_answer": "A"
    },
    {
      "id": 14,
      "difficulty": "easy",
      "question": "🎯 TSA formula? 🎯",
      "options": { "A": "2πr(h+r)", "B": "πr²h", "C": "2πrh", "D": "πr(h+r)" },
      "correct_answer": "A"
    },
    {
      "id": 15,
      "difficulty": "easy",
      "question": "📐 CSA = 88 cm², r=7 cm. Find h (π=22/7). 📐",
      "options": { "A": "2 cm", "B": "1 cm", "C": "4 cm", "D": "3 cm" },
      "correct_answer": "A"
    },
    {
      "id": 16,
      "difficulty": "easy",
      "question": "🔵 Cylinder r=10 cm, TSA=1884 cm² (π=3.14). Find h. 🔵",
      "options": { "A": "20 cm", "B": "10 cm", "C": "30 cm", "D": "40 cm" },
      "correct_answer": "A"
    },
    {
      "id": 17,
      "difficulty": "easy",
      "question": "🧮 If height doubles, CSA becomes? (r same) 🧮",
      "options": { "A": "Double", "B": "Same", "C": "Half", "D": "Four times" },
      "correct_answer": "A"
    },
    {
      "id": 18,
      "difficulty": "easy",
      "question": "🎨 Pillar r=28 cm, h=3 m. CSA in m²? (π=22/7) 🎨",
      "options": {
        "A": "5.28 m²",
        "B": "2.64 m²",
        "C": "10.56 m²",
        "D": "1.32 m²"
      },
      "correct_answer": "A"
    },
    {
      "id": 19,
      "difficulty": "easy",
      "question": "🥤 Cup r=3.5 cm, h=10 cm. TSA? (π=22/7) 🥤",
      "options": {
        "A": "297 cm²",
        "B": "148.5 cm²",
        "C": "445.5 cm²",
        "D": "594 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 20,
      "difficulty": "easy",
      "question": "📦 Box cylinder: r=1 m, h=1 m. TSA? (π=3.14) 📦",
      "options": {
        "A": "12.56 m²",
        "B": "6.28 m²",
        "C": "3.14 m²",
        "D": "9.42 m²"
      },
      "correct_answer": "A"
    },
    {
      "id": 21,
      "difficulty": "medium",
      "question": "🏗️ Pillar diameter 28 cm, height 5 m. Find cost of painting CSA at ₹5 per m². (π=22/7) 🏗️",
      "options": { "A": "₹22", "B": "₹44", "C": "₹11", "D": "₹33" },
      "correct_answer": "A"
    },
    {
      "id": 22,
      "difficulty": "medium",
      "question": "🚰 Tank r=2.1 m, h=4 m. Find area of metal sheet for CSA only. (π=22/7) 🚰",
      "options": {
        "A": "52.8 m²",
        "B": "105.6 m²",
        "C": "26.4 m²",
        "D": "79.2 m²"
      },
      "correct_answer": "A"
    },
    {
      "id": 23,
      "difficulty": "medium",
      "question": "🎨 Cylinder TSA=616 cm², height=10 cm (π=22/7). Find radius. 🎨",
      "options": { "A": "7 cm", "B": "14 cm", "C": "3.5 cm", "D": "10 cm" },
      "correct_answer": "A"
    },
    {
      "id": 24,
      "difficulty": "medium",
      "question": "📦 If CSA of cylinder=440 cm², r=7 cm (π=22/7), find height. 📦",
      "options": { "A": "10 cm", "B": "5 cm", "C": "20 cm", "D": "15 cm" },
      "correct_answer": "A"
    },
    {
      "id": 25,
      "difficulty": "medium",
      "question": "🔧 Cylinder TSA=1386 cm², r=10.5 cm (π=22/7). Find h. 🔧",
      "options": { "A": "11 cm", "B": "5.5 cm", "C": "22 cm", "D": "16.5 cm" },
      "correct_answer": "A"
    },
    {
      "id": 26,
      "difficulty": "medium",
      "question": "🛢️ Cylinder h=15 cm, CSA=660 cm² (π=22/7). Find diameter. 🛢️",
      "options": { "A": "14 cm", "B": "7 cm", "C": "28 cm", "D": "21 cm" },
      "correct_answer": "A"
    },
    {
      "id": 27,
      "difficulty": "medium",
      "question": "🏠 Pillar radius 0.5 m, height 4 m. Whitewash CSA at ₹2/m². Cost? (π=3.14) 🏠",
      "options": { "A": "₹25.12", "B": "₹50.24", "C": "₹12.56", "D": "₹37.68" },
      "correct_answer": "A"
    },
    {
      "id": 28,
      "difficulty": "medium",
      "question": "🥫 Can height=24 cm, CSA=528 cm² (π=22/7). Find r. 🥫",
      "options": { "A": "3.5 cm", "B": "7 cm", "C": "10.5 cm", "D": "14 cm" },
      "correct_answer": "A"
    },
    {
      "id": 29,
      "difficulty": "medium",
      "question": "🎯 Cylinder TSA=2πr(r+h). If r=7, TSA=748 cm² (π=22/7), h=? 🎯",
      "options": { "A": "10 cm", "B": "20 cm", "C": "5 cm", "D": "15 cm" },
      "correct_answer": "A"
    },
    {
      "id": 30,
      "difficulty": "medium",
      "question": "📏 Ratio of radii 2:3, heights 5:4. Ratio of their CSA? 📏",
      "options": { "A": "5:6", "B": "10:12", "C": "2:3", "D": "5:4" },
      "correct_answer": "A"
    },
    {
      "id": 31,
      "difficulty": "medium",
      "question": "🚀 Two cylinders same height, r1:r2=3:4. CSA ratio? 🚀",
      "options": { "A": "3:4", "B": "9:16", "C": "4:3", "D": "2:3" },
      "correct_answer": "A"
    },
    {
      "id": 32,
      "difficulty": "medium",
      "question": "🔵 Cylinder A: r=7, h=10; Cylinder B: r=14, h=5. Compare CSA (π=22/7). 🔵",
      "options": {
        "A": "Equal",
        "B": "A larger",
        "C": "B larger",
        "D": "Double"
      },
      "correct_answer": "A"
    },
    {
      "id": 33,
      "difficulty": "medium",
      "question": "🧮 Cylinder height increased 20%, radius decreased 10%. CSA change %? 🧮",
      "options": {
        "A": "8% increase",
        "B": "8% decrease",
        "C": "2% increase",
        "D": "2% decrease"
      },
      "correct_answer": "A"
    },
    {
      "id": 34,
      "difficulty": "medium",
      "question": "🎨 Curved surface area=100π, height=10. Find r. 🎨",
      "options": { "A": "5", "B": "10", "C": "20", "D": "15" },
      "correct_answer": "A"
    },
    {
      "id": 35,
      "difficulty": "medium",
      "question": "📦 Cylinder r=10 cm, h=21 cm. Find TSA in cm² (π=22/7). 📦",
      "options": {
        "A": "1940 cm²",
        "B": "1320 cm²",
        "C": "2420 cm²",
        "D": "880 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 36,
      "difficulty": "medium",
      "question": "🏗️ Pillar CSA=6.6 m², h=3 m (π=22/7). Find diameter. 🏗️",
      "options": { "A": "0.7 m", "B": "1.4 m", "C": "2.1 m", "D": "0.35 m" },
      "correct_answer": "A"
    },
    {
      "id": 37,
      "difficulty": "medium",
      "question": "🚰 Tank height=2 m, TSA=56π m². Find r. 🚰",
      "options": { "A": "3 m", "B": "4 m", "C": "6 m", "D": "5 m" },
      "correct_answer": "A"
    },
    {
      "id": 38,
      "difficulty": "medium",
      "question": "🥤 Cup CSA=94.2 cm², r=3 cm (π=3.14). Find h. 🥤",
      "options": { "A": "5 cm", "B": "10 cm", "C": "15 cm", "D": "20 cm" },
      "correct_answer": "A"
    },
    {
      "id": 39,
      "difficulty": "medium",
      "question": "🔧 Cylinder TSA=150.72 cm², h=4 cm (π=3.14). Find r. 🔧",
      "options": { "A": "3 cm", "B": "6 cm", "C": "2 cm", "D": "1.5 cm" },
      "correct_answer": "A"
    },
    {
      "id": 40,
      "difficulty": "medium",
      "question": "🎈 Balloon r=14 cm, TSA=2464 cm² (π=22/7). Find h. 🎈",
      "options": { "A": "14 cm", "B": "7 cm", "C": "28 cm", "D": "21 cm" },
      "correct_answer": "A"
    },
    {
      "id": 41,
      "difficulty": "hard",
      "question": "🏭 Cylinder open at top: r=7 cm, h=10 cm. Find area of metal sheet needed (π=22/7). 🏭",
      "options": {
        "A": "374 cm²",
        "B": "594 cm²",
        "C": "748 cm²",
        "D": "297 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 42,
      "difficulty": "hard",
      "question": "🚀 Two cylinders equal TSA. r1:r2=2:3. Find h1:h2. 🚀",
      "options": { "A": "9:4", "B": "4:9", "C": "3:2", "D": "2:3" },
      "correct_answer": "A"
    },
    {
      "id": 43,
      "difficulty": "hard",
      "question": "🔵 Cylinder radius increased 50%, height decreased 40%. % change in CSA? 🔵",
      "options": {
        "A": "10% decrease",
        "B": "10% increase",
        "C": "20% decrease",
        "D": "No change"
      },
      "correct_answer": "A"
    },
    {
      "id": 44,
      "difficulty": "hard",
      "question": "📏 Cylinder height=20 cm, CSA=TSA. Find r. 📏",
      "options": { "A": "20 cm", "B": "10 cm", "C": "5 cm", "D": "15 cm" },
      "correct_answer": "A"
    },
    {
      "id": 45,
      "difficulty": "hard",
      "question": "🧮 Ratio of TSA to CSA of cylinder=3:2. Find r:h. 🧮",
      "options": { "A": "2:1", "B": "1:2", "C": "3:2", "D": "2:3" },
      "correct_answer": "A"
    },
    {
      "id": 46,
      "difficulty": "hard",
      "question": "🎨 Cylinder TSA=3080 cm², height=30 cm (π=22/7). Find diameter. 🎨",
      "options": { "A": "28 cm", "B": "14 cm", "C": "7 cm", "D": "56 cm" },
      "correct_answer": "A"
    },
    {
      "id": 47,
      "difficulty": "hard",
      "question": "🏗️ Pillar CSA=66 m², diameter=2 m (π=22/7). Find height. 🏗️",
      "options": { "A": "10.5 m", "B": "21 m", "C": "5.25 m", "D": "15 m" },
      "correct_answer": "A"
    },
    {
      "id": 48,
      "difficulty": "hard",
      "question": "🚰 Tank open at top: r=10.5 m, h=3 m. Find area of sheet for making it (π=22/7). 🚰",
      "options": {
        "A": "148.5 m²",
        "B": "297 m²",
        "C": "445.5 m²",
        "D": "198 m²"
      },
      "correct_answer": "A"
    },
    {
      "id": 49,
      "difficulty": "hard",
      "question": "🥫 Can TSA=1848 cm², height=24 cm (π=22/7). Find radius. 🥫",
      "options": { "A": "7 cm", "B": "14 cm", "C": "3.5 cm", "D": "10.5 cm" },
      "correct_answer": "A"
    },
    {
      "id": 50,
      "difficulty": "hard",
      "question": "🔧 Cylinder CSA=4400 cm², r=25 cm (π=22/7). Find TSA. 🔧",
      "options": {
        "A": "6600 cm²",
        "B": "7700 cm²",
        "C": "8800 cm²",
        "D": "5500 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 51,
      "difficulty": "hard",
      "question": "🎯 Height halved, radius doubled. CSA becomes? 🎯",
      "options": { "A": "Same", "B": "Double", "C": "Half", "D": "Four times" },
      "correct_answer": "A"
    },
    {
      "id": 52,
      "difficulty": "hard",
      "question": "📦 Cylinder metal sheet 1 mm thick, r=7 cm, h=10 cm. Outer CSA? (π=22/7) 📦",
      "options": {
        "A": "440 cm²",
        "B": "440.44 cm²",
        "C": "439.56 cm²",
        "D": "441 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 53,
      "difficulty": "hard",
      "question": "🚀 Two cylinders: h1:h2=2:3, r1:r2=5:4. CSA ratio? 🚀",
      "options": { "A": "5:6", "B": "10:12", "C": "5:4", "D": "15:8" },
      "correct_answer": "A"
    },
    {
      "id": 54,
      "difficulty": "hard",
      "question": "🏠 Room cylindrical: r=3.5 m, h=4 m. Whitewash walls+ceiling (no floor) at ₹2/m². Cost? (π=22/7) 🏠",
      "options": { "A": "₹198", "B": "₹396", "C": "₹297", "D": "₹99" },
      "correct_answer": "A"
    },
    {
      "id": 55,
      "difficulty": "hard",
      "question": "🔵 Cylinder TSA=4×CSA. Find r:h. 🔵",
      "options": { "A": "1:1", "B": "2:1", "C": "1:2", "D": "3:2" },
      "correct_answer": "A"
    },
    {
      "id": 56,
      "difficulty": "hard",
      "question": "🧮 Cylinder radius 10 cm, height 20 cm. Find area to paint if 10% of TSA is overlaps (π=3.14). 🧮",
      "options": {
        "A": "1884 cm²",
        "B": "2072.4 cm²",
        "C": "1695.6 cm²",
        "D": "2260.8 cm²"
      },
      "correct_answer": "A"
    },
    {
      "id": 57,
      "difficulty": "hard",
      "question": "🎨 Cylinder height=radius. TSA=2464 cm² (π=22/7). Find r. 🎨",
      "options": { "A": "14 cm", "B": "7 cm", "C": "28 cm", "D": "21 cm" },
      "correct_answer": "A"
    },
    {
      "id": 58,
      "difficulty": "hard",
      "question": "📏 Cylinder CSA=100π, TSA=150π. Find r. 📏",
      "options": { "A": "5", "B": "10", "C": "15", "D": "20" },
      "correct_answer": "A"
    },
    {
      "id": 59,
      "difficulty": "hard",
      "question": "🏗️ Pillar radius doubled, height halved. % change in TSA? 🏗️",
      "options": {
        "A": "50% increase",
        "B": "50% decrease",
        "C": "No change",
        "D": "100% increase"
      },
      "correct_answer": "A"
    },
    {
      "id": 60,
      "difficulty": "hard",
      "question": "🚰 Tank open: r=2 m, h=5 m. Find cost of sheet @₹100/m² (π=3.14). 🚰",
      "options": { "A": "₹8164", "B": "₹7536", "C": "₹8792", "D": "₹9420" },
      "correct_answer": "A"
    }
  ]
}