{
  "title": "Volume of Cube, Cuboid, Cylinder - Grade 9 ICSE",
  "total_questions": 60,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "Volume of a cube with side 4 cm is: 🧊", "options": {"A": "16 cm³", "B": "64 cm³", "C": "24 cm³", "D": "96 cm³"}, "correct_answer": "B"},
    {"id": 2, "difficulty": "easy", "question": "Formula for volume of cuboid is: 📦", "options": {"A": "l + b + h", "B": "2(lb + bh + hl)", "C": "l × b × h", "D": "l × b"}, "correct_answer": "C"},
    {"id": 3, "difficulty": "easy", "question": "Volume of cylinder = ? 🥫", "options": {"A": "πr²h", "B": "2πrh", "C": "πr²h/3", "D": "2πr²h"}, "correct_answer": "A"},
    {"id": 4, "difficulty": "easy", "question": "Find volume of cuboid: l=5 cm, b=3 cm, h=2 cm.", "options": {"A": "30 cm³", "B": "25 cm³", "C": "15 cm³", "D": "10 cm³"}, "correct_answer": "A"},
    {"id": 5, "difficulty": "easy", "question": "If side of cube is doubled, volume becomes ____ times. 🔲🔲", "options": {"A": "2", "B": "4", "C": "6", "D": "8"}, "correct_answer": "D"},
    {"id": 6, "difficulty": "easy", "question": "A cylinder has radius 7 cm, height 10 cm. Volume? (π=22/7)", "options": {"A": "1540 cm³", "B": "440 cm³", "C": "3080 cm³", "D": "220 cm³"}, "correct_answer": "A"},
    {"id": 7, "difficulty": "easy", "question": "How many 1 cm cubes can fit in a 5 cm cube? 🔳", "options": {"A": "25", "B": "125", "C": "100", "D": "250"}, "correct_answer": "B"},
    {"id": 8, "difficulty": "easy", "question": "Volume of cube = 343 cm³. Side length? 🔍", "options": {"A": "6 cm", "B": "8 cm", "C": "7 cm", "D": "9 cm"}, "correct_answer": "C"},
    {"id": 9, "difficulty": "easy", "question": "A cuboid volume 240 cm³, length 8 cm, breadth 5 cm. Height? 📏", "options": {"A": "4 cm", "B": "6 cm", "C": "8 cm", "D": "10 cm"}, "correct_answer": "B"},
    {"id": 10, "difficulty": "easy", "question": "Volume of water tank 2 m × 1.5 m × 1 m = ? 💧", "options": {"A": "3 m³", "B": "4.5 m³", "C": "2.5 m³", "D": "3.5 m³"}, "correct_answer": "A"},
    {"id": 11, "difficulty": "easy", "question": "If radius of cylinder doubles and height halves, volume ____. 🔄", "options": {"A": "Doubles", "B": "Halves", "C": "Same", "D": "Quadruples"}, "correct_answer": "A"},
    {"id": 12, "difficulty": "easy", "question": "Cube volume 64 cm³, its side? 🧊", "options": {"A": "2 cm", "B": "4 cm", "C": "8 cm", "D": "16 cm"}, "correct_answer": "B"},
    {"id": 13, "difficulty": "easy", "question": "Cylinder radius 10 cm, height 14 cm. Volume? (π=22/7)", "options": {"A": "4400 cm³", "B": "3080 cm³", "C": "1540 cm³", "D": "6160 cm³"}, "correct_answer": "A"},
    {"id": 14, "difficulty": "easy", "question": "A cuboid dimensions 12 cm × 8 cm × 6 cm. How many cubes of side 2 cm can fit? 📦", "options": {"A": "72", "B": "144", "C": "288", "D": "576"}, "correct_answer": "A"},
    {"id": 15, "difficulty": "easy", "question": "If cube side 9 cm, volume? 🔢", "options": {"A": "729 cm³", "B": "81 cm³", "C": "648 cm³", "D": "972 cm³"}, "correct_answer": "A"},
    {"id": 16, "difficulty": "easy", "question": "Volume of a cylinder is 1540 cm³, radius 7 cm. Height? (π=22/7) 🥫", "options": {"A": "10 cm", "B": "15 cm", "C": "20 cm", "D": "25 cm"}, "correct_answer": "A"},
    {"id": 17, "difficulty": "easy", "question": "Cuboid volume 300 cm³, l=10 cm, b=5 cm, h=? 📐", "options": {"A": "6 cm", "B": "8 cm", "C": "4 cm", "D": "5 cm"}, "correct_answer": "A"},
    {"id": 18, "difficulty": "easy", "question": "A cube of edge 0.5 m has volume ____ liters. (1 m³ = 1000 L) 💧", "options": {"A": "125 L", "B": "250 L", "C": "500 L", "D": "1000 L"}, "correct_answer": "A"},
    {"id": 19, "difficulty": "easy", "question": "Cylinder volume formula uses πr²h. If r=3 cm, h=7 cm, volume? (π=22/7)", "options": {"A": "198 cm³", "B": "132 cm³", "C": "154 cm³", "D": "176 cm³"}, "correct_answer": "A"},
    {"id": 20, "difficulty": "easy", "question": "A box holds 48 cubes of side 1 cm. If length=4 cm, breadth=3 cm, height? 📦", "options": {"A": "2 cm", "B": "3 cm", "C": "4 cm", "D": "6 cm"}, "correct_answer": "C"},

    {"id": 21, "difficulty": "medium", "question": "If dimensions of cuboid are 15 cm, 12 cm, 10 cm, how many cubes of side 3 cm can fit? 📦", "options": {"A": "200", "B": "66", "C": "100", "D": "150"}, "correct_answer": "A"},
    {"id": 22, "difficulty": "medium", "question": "Volume of a cylinder is 1232 cm³, height 8 cm. Radius? (π=22/7) 🔍", "options": {"A": "3.5 cm", "B": "7 cm", "C": "14 cm", "D": "10.5 cm"}, "correct_answer": "B"},
    {"id": 23, "difficulty": "medium", "question": "A cube of side 8 cm is melted to form a cylinder of radius 7 cm. Height of cylinder? (π=22/7) ♻️", "options": {"A": "4.15 cm", "B": "3.64 cm", "C": "2.08 cm", "D": "5.82 cm"}, "correct_answer": "B"},
    {"id": 24, "difficulty": "medium", "question": "Cylinder A radius 5 cm height 10 cm, Cylinder B radius 10 cm height 5 cm. Compare volumes. ⚖️", "options": {"A": "A > B", "B": "A = B", "C": "A < B", "D": "Cannot compare"}, "correct_answer": "C"},
    {"id": 25, "difficulty": "medium", "question": "A cuboid volume 720 cm³, ratio l:b:h = 5:4:3. Find length. 🔢", "options": {"A": "10 cm", "B": "12 cm", "C": "15 cm", "D": "20 cm"}, "correct_answer": "A"},
    {"id": 26, "difficulty": "medium", "question": "Cylinder height increased by 20%, radius decreased by 10%. Volume change? 📈📉", "options": {"A": "Increase 2.8%", "B": "Decrease 2.8%", "C": "Increase 5.6%", "D": "Decrease 5.6%"}, "correct_answer": "B"},
    {"id": 27, "difficulty": "medium", "question": "A room 6 m × 5 m × 4 m. How much air it contains? 💨", "options": {"A": "120 m³", "B": "100 m³", "C": "96 m³", "D": "80 m³"}, "correct_answer": "A"},
    {"id": 28, "difficulty": "medium", "question": "Cylinder volume 3850 cm³, diameter 14 cm. Height? (π=22/7)", "options": {"A": "25 cm", "B": "30 cm", "C": "35 cm", "D": "40 cm"}, "correct_answer": "A"},
    {"id": 29, "difficulty": "medium", "question": "Three cubes of sides 3 cm, 4 cm, 5 cm melted to form one cube. Side of new cube? ♻️", "options": {"A": "6 cm", "B": "7 cm", "C": "8 cm", "D": "9 cm"}, "correct_answer": "A"},
    {"id": 30, "difficulty": "medium", "question": "If edge of cube increased by 50%, volume increases by? 📈", "options": {"A": "50%", "B": "125%", "C": "150%", "D": "237.5%"}, "correct_answer": "D"},
    {"id": 31, "difficulty": "medium", "question": "Cylinder radius 7 cm, height 10 cm water. How many spheres radius 3.5 cm can melt to fill it? (π=22/7) 💧", "options": {"A": "12", "B": "10", "C": "8", "D": "6"}, "correct_answer": "A"},
    {"id": 32, "difficulty": "medium", "question": "Cuboid volume 2400 cm³, l:b:h = 5:3:2. Find height. 📏", "options": {"A": "8 cm", "B": "10 cm", "C": "12 cm", "D": "15 cm"}, "correct_answer": "A"},
    {"id": 33, "difficulty": "medium", "question": "A well diameter 3 m, depth 14 m. Volume of earth dug out? (π=22/7) 🕳️", "options": {"A": "99 m³", "B": "198 m³", "C": "66 m³", "D": "132 m³"}, "correct_answer": "A"},
    {"id": 34, "difficulty": "medium", "question": "Cube volume 512 cm³, painted and cut into 1 cm cubes. Cubes with no paint? 🎨", "options": {"A": "216", "B": "180", "C": "270", "D": "384"}, "correct_answer": "A"},
    {"id": 35, "difficulty": "medium", "question": "Cylinder height = diameter. If volume is 4312 cm³, find radius. (π=22/7) 🔄", "options": {"A": "7 cm", "B": "14 cm", "C": "21 cm", "D": "10.5 cm"}, "correct_answer": "A"},
    {"id": 36, "difficulty": "medium", "question": "A rectangular tank 6 m × 4 m × 2 m half filled. Water volume in liters? 💧", "options": {"A": "24000 L", "B": "48000 L", "C": "12000 L", "D": "96000 L"}, "correct_answer": "A"},
    {"id": 37, "difficulty": "medium", "question": "From a cuboid 15×12×9 cm, largest cube carved out. Volume of cube? 🧊", "options": {"A": "729 cm³", "B": "512 cm³", "C": "1000 cm³", "D": "1331 cm³"}, "correct_answer": "A"},
    {"id": 38, "difficulty": "medium", "question": "Two cylinders have equal volume. Ratio radii 2:3, ratio heights? 🔢", "options": {"A": "9:4", "B": "4:9", "C": "3:2", "D": "2:3"}, "correct_answer": "A"},
    {"id": 39, "difficulty": "medium", "question": "A pipe radius 2 cm, length 1 m. Volume of water it can hold? (π=3.14) 🌊", "options": {"A": "1256 cm³", "B": "628 cm³", "C": "314 cm³", "D": "942 cm³"}, "correct_answer": "A"},
    {"id": 40, "difficulty": "medium", "question": "Cube side s melted into cuboid l=2s, b=s, h=? to keep volume same.", "options": {"A": "s/2", "B": "s", "C": "2s", "D": "s/4"}, "correct_answer": "A"},

    {"id": 41, "difficulty": "hard", "question": "A hollow cylinder height 20 cm, outer radius 12 cm, inner radius 10 cm. Volume of metal? (π=3.14) 🛡️", "options": {"A": "2512 cm³", "B": "1381.6 cm³", "C": "2763.2 cm³", "D": "1256 cm³"}, "correct_answer": "C"},
    {"id": 42, "difficulty": "hard", "question": "Cuboid length doubled, breadth halved, height tripled. New volume to old volume ratio? 🔄", "options": {"A": "1:1", "B": "2:1", "C": "3:1", "D": "4:1"}, "correct_answer": "C"},
    {"id": 43, "difficulty": "hard", "question": "Cylinder radius 7 cm partially filled with water. Sphere radius 3.5 cm immersed. Rise in water level? 💧", "options": {"A": "0.33 cm", "B": "0.67 cm", "C": "1 cm", "D": "1.5 cm"}, "correct_answer": "B"},
    {"id": 44, "difficulty": "hard", "question": "Cube of side 14 cm has a cylindrical hole radius 3 cm drilled through. Remaining volume? (π=22/7) 🕳️", "options": {"A": "2744 - 396", "B": "2744 - 198", "C": "2744 - 1584", "D": "2744 - 792"}, "correct_answer": "A"},
    {"id": 45, "difficulty": "hard", "question": "A rectangular block 16×12×8 cm melted to form cubes of side 4 cm. How many cubes? ♻️", "options": {"A": "24", "B": "48", "C": "96", "D": "192"}, "correct_answer": "A"},
    {"id": 46, "difficulty": "hard", "question": "Cylinder volume 2156 cm³, curved surface area 616 cm². Find height. (π=22/7) 🔍", "options": {"A": "7 cm", "B": "14 cm", "C": "21 cm", "D": "28 cm"}, "correct_answer": "B"},
    {"id": 47, "difficulty": "hard", "question": "From a cube of side 9 cm, largest cylinder carved out. Volume of cylinder? (π=3.14) 🧊🥫", "options": {"A": "572.265 cm³", "B": "381.51 cm³", "C": "763.02 cm³", "D": "1144.53 cm³"}, "correct_answer": "A"},
    {"id": 48, "difficulty": "hard", "question": "Cylinder A radius r, height h, Cylinder B radius h, height r. Ratio of volumes A:B? 🔄", "options": {"A": "r:h", "B": "h:r", "C": "r²:h²", "D": "1:1"}, "correct_answer": "A"},
    {"id": 49, "difficulty": "hard", "question": "Cuboid volume 1440 cm³, surface area 792 cm². If l:b:h = 5:4:3, find length. 📏", "options": {"A": "10 cm", "B": "12 cm", "C": "15 cm", "D": "20 cm"}, "correct_answer": "A"},
    {"id": 50, "difficulty": "hard", "question": "A cylindrical tank radius 1.4 m, height 2.1 m. How many liters of water? (π=22/7, 1 m³=1000 L) 💧", "options": {"A": "12936 L", "B": "1293.6 L", "C": "129360 L", "D": "12936 L"}, "correct_answer": "A"},
    {"id": 51, "difficulty": "hard", "question": "Two cubes sides 6 cm and 8 cm melted to form a single cube. Edge of new cube? ♻️", "options": {"A": "10 cm", "B": "12 cm", "C": "14 cm", "D": "16 cm"}, "correct_answer": "A"},
    {"id": 52, "difficulty": "hard", "question": "Cylinder volume same as cube of side 14 cm. If cylinder height 28 cm, radius? (π=22/7) ⚖️", "options": {"A": "7 cm", "B": "14 cm", "C": "√14 cm", "D": "3.5 cm"}, "correct_answer": "A"},
    {"id": 53, "difficulty": "hard", "question": "If cube edge reduced by 30%, volume reduces by? 📉", "options": {"A": "30%", "B": "51%", "C": "65.7%", "D": "70%"}, "correct_answer": "C"},
    {"id": 54, "difficulty": "hard", "question": "Cuboid l=2x, b=x, h=x/2 has volume 256 cm³. Find x. 🔍", "options": {"A": "4 cm", "B": "6 cm", "C": "8 cm", "D": "10 cm"}, "correct_answer": "C"},
    {"id": 55, "difficulty": "hard", "question": "A rectangular sheet 22 cm × 14 cm rolled along length to form cylinder. Volume? (π=22/7) 🔄", "options": {"A": "539 cm³", "B": "1078 cm³", "C": "2156 cm³", "D": "1724 cm³"}, "correct_answer": "A"},
    {"id": 56, "difficulty": "hard", "question": "Cylinder height = diameter. If TSA is 462 cm², volume? (π=22/7) 🥫", "options": {"A": "539 cm³", "B": "1078 cm³", "C": "1617 cm³", "D": "2156 cm³"}, "correct_answer": "A"},
    {"id": 57, "difficulty": "hard", "question": "Cuboid cut into two equal cubes of side 6 cm. Original cuboid volume? ✂️", "options": {"A": "216 cm³", "B": "432 cm³", "C": "648 cm³", "D": "864 cm³"}, "correct_answer": "B"},
    {"id": 58, "difficulty": "hard", "question": "Cylinder radius r increased by 20%, height decreased by 25%. Volume change? 🔄", "options": {"A": "Increase 8%", "B": "Decrease 8%", "C": "Increase 15%", "D": "Decrease 15%"}, "correct_answer": "B"},
    {"id": 59, "difficulty": "hard", "question": "Cuboid water tank 5×4×3 m has water up to 2 m height. Volume of water in liters? 💧", "options": {"A": "40000 L", "B": "60000 L", "C": "80000 L", "D": "120000 L"}, "correct_answer": "A"},
    {"id": 60, "difficulty": "hard", "question": "Cube of side a has same volume as cylinder radius a/2, height h. Find h in terms of a. ⚖️", "options": {"A": "4a/π", "B": "a/π", "C": "2a/π", "D": "πa/4"}, "correct_answer": "A"}
  ]
}