{
  "title": "Area of Circles Introduction - Grade 7 CBSE",
  "total_questions": 150,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "What is the formula for area of a circle?", "options": {"A": "πd", "B": "2πr", "C": "πr²", "D": "πr"}, "correct_answer": "C"},
    {"id": 2, "difficulty": "easy", "question": "If radius of a circle is 7 cm, what is its area? (π = 22/7)", "options": {"A": "44 cm²", "B": "154 cm²", "C": "88 cm²", "D": "308 cm²"}, "correct_answer": "B"},
    {"id": 3, "difficulty": "easy", "question": "What is the value of π approximately?", "options": {"A": "2.14", "B": "3.14", "C": "4.14", "D": "1.14"}, "correct_answer": "B"},
    {"id": 4, "difficulty": "easy", "question": "If diameter of a circle is 14 cm, what is its radius?", "options": {"A": "7 cm", "B": "14 cm", "C": "28 cm", "D": "3.5 cm"}, "correct_answer": "A"},
    {"id": 5, "difficulty": "easy", "question": "What is the area of a circle with radius 10 cm? (π = 3.14)", "options": {"A": "31.4 cm²", "B": "62.8 cm²", "C": "314 cm²", "D": "628 cm²"}, "correct_answer": "C"},
    {"id": 6, "difficulty": "easy", "question": "The distance from center to any point on a circle is called?", "options": {"A": "Diameter", "B": "Circumference", "C": "Radius", "D": "Chord"}, "correct_answer": "C"},
    {"id": 7, "difficulty": "easy", "question": "If area of a circle is 154 cm², what is its radius? (π = 22/7)", "options": {"A": "7 cm", "B": "14 cm", "C": "3.5 cm", "D": "10.5 cm"}, "correct_answer": "A"},
    {"id": 8, "difficulty": "easy", "question": "What is twice the radius called?", "options": {"A": "Chord", "B": "Diameter", "C": "Circumference", "D": "Arc"}, "correct_answer": "B"},
    {"id": 9, "difficulty": "easy", "question": "If radius is 5 cm, what is area? (π = 3.14)", "options": {"A": "15.7 cm²", "B": "31.4 cm²", "C": "78.5 cm²", "D": "157 cm²"}, "correct_answer": "C"},
    {"id": 10, "difficulty": "easy", "question": "What is π × radius × radius equal to?", "options": {"A": "Circumference", "B": "Diameter", "C": "Area", "D": "Perimeter"}, "correct_answer": "C"},
    {"id": 11, "difficulty": "easy", "question": "If diameter is 20 cm, what is area? (π = 3.14)", "options": {"A": "62.8 cm²", "B": "125.6 cm²", "C": "314 cm²", "D": "628 cm²"}, "correct_answer": "C"},
    {"id": 12, "difficulty": "easy", "question": "What is 22/7 as a decimal approximately?", "options": {"A": "2.14", "B": "3.14", "C": "4.14", "D": "5.14"}, "correct_answer": "B"},
    {"id": 13, "difficulty": "easy", "question": "If area is 78.5 cm², what is radius? (π = 3.14)", "options": {"A": "5 cm", "B": "10 cm", "C": "15 cm", "D": "20 cm"}, "correct_answer": "A"},
    {"id": 14, "difficulty": "easy", "question": "Which is larger: area or circumference of a circle?", "options": {"A": "Area", "B": "Circumference", "C": "They are equal", "D": "Depends on radius"}, "correct_answer": "D"},
    {"id": 15, "difficulty": "easy", "question": "What is area of a circle with radius 1 cm? (π = 3.14)", "options": {"A": "3.14 cm²", "B": "6.28 cm²", "C": "1.57 cm²", "D": "12.56 cm²"}, "correct_answer": "A"},
    {"id": 16, "difficulty": "easy", "question": "If circumference is 44 cm, what is area? (π = 22/7)", "options": {"A": "154 cm²", "B": "308 cm²", "C": "77 cm²", "D": "616 cm²"}, "correct_answer": "A"},
    {"id": 17, "difficulty": "easy", "question": "What is πr² for r = 0?", "options": {"A": "0", "B": "π", "C": "1", "D": "Undefined"}, "correct_answer": "A"},
    {"id": 18, "difficulty": "easy", "question": "If radius doubles, area becomes how many times?", "options": {"A": "2 times", "B": "4 times", "C": "8 times", "D": "Same"}, "correct_answer": "B"},
    {"id": 19, "difficulty": "easy", "question": "What is area of a circle with diameter 28 cm? (π = 22/7)", "options": {"A": "154 cm²", "B": "308 cm²", "C": "616 cm²", "D": "1232 cm²"}, "correct_answer": "C"},
    {"id": 20, "difficulty": "easy", "question": "Which is constant for all circles?", "options": {"A": "Radius", "B": "Diameter", "C": "π", "D": "Area"}, "correct_answer": "C"},
    
    {"id": 21, "difficulty": "medium", "question": "If area of a circle is 616 cm², what is its diameter? (π = 22/7)", "options": {"A": "14 cm", "B": "28 cm", "C": "42 cm", "D": "56 cm"}, "correct_answer": "B"},
    {"id": 22, "difficulty": "medium", "question": "What is the area of a circle whose circumference is 88 cm? (π = 22/7)", "options": {"A": "154 cm²", "B": "308 cm²", "C": "616 cm²", "D": "1232 cm²"}, "correct_answer": "C"},
    {"id": 23, "difficulty": "medium", "question": "If radius increases by 50%, area increases by?", "options": {"A": "50%", "B": "100%", "C": "125%", "D": "225%"}, "correct_answer": "C"},
    {"id": 24, "difficulty": "medium", "question": "What is the area of a circle with radius 3.5 cm? (π = 22/7)", "options": {"A": "38.5 cm²", "B": "77 cm²", "C": "22 cm²", "D": "44 cm²"}, "correct_answer": "A"},
    {"id": 25, "difficulty": "medium", "question": "If area of a circle is 201.06 cm², what is its radius? (π = 3.14)", "options": {"A": "6 cm", "B": "8 cm", "C": "10 cm", "D": "12 cm"}, "correct_answer": "B"},
    {"id": 26, "difficulty": "medium", "question": "What is the area of a circle with diameter 10.5 cm? (π = 22/7)", "options": {"A": "86.625 cm²", "B": "173.25 cm²", "C": "346.5 cm²", "D": "693 cm²"}, "correct_answer": "A"},
    {"id": 27, "difficulty": "medium", "question": "If circumference of a circle is 31.4 cm, what is its area? (π = 3.14)", "options": {"A": "78.5 cm²", "B": "157 cm²", "C": "31.4 cm²", "D": "62.8 cm²"}, "correct_answer": "A"},
    {"id": 28, "difficulty": "medium", "question": "Two circles have radii in ratio 2:3. What is ratio of their areas?", "options": {"A": "2:3", "B": "3:2", "C": "4:9", "D": "9:4"}, "correct_answer": "C"},
    {"id": 29, "difficulty": "medium", "question": "What is area of circle with radius 21 cm? (π = 22/7)", "options": {"A": "1386 cm²", "B": "2772 cm²", "C": "4158 cm²", "D": "5544 cm²"}, "correct_answer": "A"},
    {"id": 30, "difficulty": "medium", "question": "If area increases by 300%, radius increases by?", "options": {"A": "50%", "B": "100%", "C": "150%", "D": "200%"}, "correct_answer": "B"},
    {"id": 31, "difficulty": "medium", "question": "What is area of circle with circumference 44 cm? (π = 22/7)", "options": {"A": "154 cm²", "B": "308 cm²", "C": "77 cm²", "D": "616 cm²"}, "correct_answer": "A"},
    {"id": 32, "difficulty": "medium", "question": "If radius is tripled, area becomes?", "options": {"A": "3 times", "B": "6 times", "C": "9 times", "D": "12 times"}, "correct_answer": "C"},
    {"id": 33, "difficulty": "medium", "question": "What is area of circle with diameter 42 cm? (π = 22/7)", "options": {"A": "1386 cm²", "B": "2772 cm²", "C": "4158 cm²", "D": "5544 cm²"}, "correct_answer": "A"},
    {"id": 34, "difficulty": "medium", "question": "If area of a circle is 154 cm², what is its circumference? (π = 22/7)", "options": {"A": "22 cm", "B": "44 cm", "C": "88 cm", "D": "176 cm"}, "correct_answer": "B"},
    {"id": 35, "difficulty": "medium", "question": "What is the radius of circle with area 1256 cm²? (π = 3.14)", "options": {"A": "10 cm", "B": "20 cm", "C": "30 cm", "D": "40 cm"}, "correct_answer": "B"},
    {"id": 36, "difficulty": "medium", "question": "If diameter is 2.8 cm, what is area? (π = 22/7)", "options": {"A": "6.16 cm²", "B": "12.32 cm²", "C": "24.64 cm²", "D": "49.28 cm²"}, "correct_answer": "A"},
    {"id": 37, "difficulty": "medium", "question": "Two circles have areas 4π and 9π. What is ratio of their radii?", "options": {"A": "2:3", "B": "4:9", "C": "3:2", "D": "9:4"}, "correct_answer": "A"},
    {"id": 38, "difficulty": "medium", "question": "What is area of circle with circumference 62.8 cm? (π = 3.14)", "options": {"A": "314 cm²", "B": "628 cm²", "C": "1256 cm²", "D": "2512 cm²"}, "correct_answer": "A"},
    {"id": 39, "difficulty": "medium", "question": "If radius decreases by 20%, area decreases by?", "options": {"A": "20%", "B": "36%", "C": "40%", "D": "64%"}, "correct_answer": "B"},
    {"id": 40, "difficulty": "medium", "question": "What is area of circle with radius 0.7 m? (π = 22/7)", "options": {"A": "1.54 m²", "B": "3.08 m²", "C": "4.62 m²", "D": "6.16 m²"}, "correct_answer": "A"},
    {"id": 41, "difficulty": "medium", "question": "If area of circle A is 4 times area of circle B, radius of A is?", "options": {"A": "2 times radius of B", "B": "4 times radius of B", "C": "8 times radius of B", "D": "16 times radius of B"}, "correct_answer": "A"},
    {"id": 42, "difficulty": "medium", "question": "What is the area of circle with diameter 10 m? (π = 3.14)", "options": {"A": "31.4 m²", "B": "62.8 m²", "C": "78.5 m²", "D": "157 m²"}, "correct_answer": "C"},
    {"id": 43, "difficulty": "medium", "question": "If circumference is 132 cm, what is area? (π = 22/7)", "options": {"A": "1386 cm²", "B": "2772 cm²", "C": "4158 cm²", "D": "5544 cm²"}, "correct_answer": "A"},
    {"id": 44, "difficulty": "medium", "question": "What is radius of circle with area 50.24 cm²? (π = 3.14)", "options": {"A": "2 cm", "B": "4 cm", "C": "6 cm", "D": "8 cm"}, "correct_answer": "B"},
    {"id": 45, "difficulty": "medium", "question": "If area of circle is 314 cm², what is diameter? (π = 3.14)", "options": {"A": "5 cm", "B": "10 cm", "C": "20 cm", "D": "40 cm"}, "correct_answer": "C"},
    {"id": 46, "difficulty": "medium", "question": "What is area of circle with circumference 88 m? (π = 22/7)", "options": {"A": "154 m²", "B": "308 m²", "C": "616 m²", "D": "1232 m²"}, "correct_answer": "C"},
    {"id": 47, "difficulty": "medium", "question": "If radius increases from 5 cm to 8 cm, area increases by?", "options": {"A": "60%", "B": "156%", "C": "256%", "D": "300%"}, "correct_answer": "B"},
    {"id": 48, "difficulty": "medium", "question": "What is area of circle with diameter 1.4 cm? (π = 22/7)", "options": {"A": "1.54 cm²", "B": "3.08 cm²", "C": "4.62 cm²", "D": "6.16 cm²"}, "correct_answer": "A"},
    {"id": 49, "difficulty": "medium", "question": "If area of circle is 12.56 cm², what is radius? (π = 3.14)", "options": {"A": "1 cm", "B": "2 cm", "C": "3 cm", "D": "4 cm"}, "correct_answer": "B"},
    {"id": 50, "difficulty": "medium", "question": "Two circles have radii 7 cm and 14 cm. What is ratio of their areas?", "options": {"A": "1:2", "B": "1:4", "C": "2:1", "D": "4:1"}, "correct_answer": "B"},
    {"id": 51, "difficulty": "medium", "question": "What is area of circle with circumference 31.4 cm? (π = 3.14)", "options": {"A": "78.5 cm²", "B": "157 cm²", "C": "31.4 cm²", "D": "62.8 cm²"}, "correct_answer": "A"},
    {"id": 52, "difficulty": "medium", "question": "If diameter is 35 cm, what is area? (π = 22/7)", "options": {"A": "962.5 cm²", "B": "1925 cm²", "C": "3850 cm²", "D": "7700 cm²"}, "correct_answer": "A"},
    {"id": 53, "difficulty": "medium", "question": "If area increases by 96%, radius increases by?", "options": {"A": "20%", "B": "40%", "C": "60%", "D": "80%"}, "correct_answer": "B"},
    {"id": 54, "difficulty": "medium", "question": "What is area of circle with radius 10.5 cm? (π = 22/7)", "options": {"A": "346.5 cm²", "B": "693 cm²", "C": "1039.5 cm²", "D": "1386 cm²"}, "correct_answer": "A"},
    {"id": 55, "difficulty": "medium", "question": "If circumference is 220 cm, what is area? (π = 22/7)", "options": {"A": "1540 cm²", "B": "3080 cm²", "C": "3850 cm²", "D": "7700 cm²"}, "correct_answer": "C"},
    {"id": 56, "difficulty": "medium", "question": "What is radius of circle with area 452.16 cm²? (π = 3.14)", "options": {"A": "6 cm", "B": "8 cm", "C": "10 cm", "D": "12 cm"}, "correct_answer": "D"},
    {"id": 57, "difficulty": "medium", "question": "If area is 2464 cm², what is diameter? (π = 22/7)", "options": {"A": "28 cm", "B": "42 cm", "C": "56 cm", "D": "84 cm"}, "correct_answer": "C"},
    {"id": 58, "difficulty": "medium", "question": "What is area of circle with circumference 44 m? (π = 22/7)", "options": {"A": "154 m²", "B": "308 m²", "C": "616 m²", "D": "1232 m²"}, "correct_answer": "A"},
    {"id": 59, "difficulty": "medium", "question": "If radius is 8.4 cm, what is area? (π = 22/7)", "options": {"A": "221.76 cm²", "B": "443.52 cm²", "C": "665.28 cm²", "D": "887.04 cm²"}, "correct_answer": "A"},
    {"id": 60, "difficulty": "medium", "question": "Two circles have areas 100π and 25π. What is ratio of their diameters?", "options": {"A": "1:2", "B": "2:1", "C": "4:1", "D": "1:4"}, "correct_answer": "B"},
    {"id": 61, "difficulty": "medium", "question": "What is area of circle with diameter 4.2 m? (π = 22/7)", "options": {"A": "13.86 m²", "B": "27.72 m²", "C": "41.58 m²", "D": "55.44 m²"}, "correct_answer": "A"},
    {"id": 62, "difficulty": "medium", "question": "If circumference increases by 40%, area increases by?", "options": {"A": "40%", "B": "80%", "C": "96%", "D": "160%"}, "correct_answer": "C"},
    {"id": 63, "difficulty": "medium", "question": "What is radius of circle with area 28.26 cm²? (π = 3.14)", "options": {"A": "1.5 cm", "B": "3 cm", "C": "4.5 cm", "D": "6 cm"}, "correct_answer": "B"},
    {"id": 64, "difficulty": "medium", "question": "If area is 15400 cm², what is radius? (π = 22/7)", "options": {"A": "35 cm", "B": "70 cm", "C": "105 cm", "D": "140 cm"}, "correct_answer": "B"},
    {"id": 65, "difficulty": "medium", "question": "What is area of circle with circumference 176 cm? (π = 22/7)", "options": {"A": "2464 cm²", "B": "4928 cm²", "C": "7392 cm²", "D": "9856 cm²"}, "correct_answer": "A"},
    {"id": 66, "difficulty": "medium", "question": "If diameter doubles, area becomes?", "options": {"A": "2 times", "B": "4 times", "C": "8 times", "D": "16 times"}, "correct_answer": "B"},
    {"id": 67, "difficulty": "medium", "question": "What is area of circle with radius 0.5 m? (π = 3.14)", "options": {"A": "0.785 m²", "B": "1.57 m²", "C": "3.14 m²", "D": "6.28 m²"}, "correct_answer": "A"},
    {"id": 68, "difficulty": "medium", "question": "If area is 113.04 cm², what is diameter? (π = 3.14)", "options": {"A": "6 cm", "B": "9 cm", "C": "12 cm", "D": "15 cm"}, "correct_answer": "C"},
    {"id": 69, "difficulty": "medium", "question": "Two circles have radii ratio 3:5. What is ratio of their areas?", "options": {"A": "3:5", "B": "5:3", "C": "9:25", "D": "25:9"}, "correct_answer": "C"},
    {"id": 70, "difficulty": "medium", "question": "What is area of circle with circumference 220 m? (π = 22/7)", "options": {"A": "1540 m²", "B": "3080 m²", "C": "3850 m²", "D": "7700 m²"}, "correct_answer": "C"},
    {"id": 71, "difficulty": "medium", "question": "If radius decreases by 30%, area decreases by?", "options": {"A": "30%", "B": "51%", "C": "60%", "D": "81%"}, "correct_answer": "B"},
    {"id": 72, "difficulty": "medium", "question": "What is radius of circle with area 706.5 cm²? (π = 3.14)", "options": {"A": "7.5 cm", "B": "15 cm", "C": "22.5 cm", "D": "30 cm"}, "correct_answer": "B"},
    {"id": 73, "difficulty": "medium", "question": "If area is 12100 cm², what is circumference? (π = 22/7)", "options": {"A": "220 cm", "B": "440 cm", "C": "660 cm", "D": "880 cm"}, "correct_answer": "B"},
    {"id": 74, "difficulty": "medium", "question": "What is area of circle with diameter 1 m? (π = 3.14)", "options": {"A": "0.785 m²", "B": "1.57 m²", "C": "3.14 m²", "D": "6.28 m²"}, "correct_answer": "A"},
    {"id": 75, "difficulty": "medium", "question": "If circumference is 157 cm, what is area? (π = 3.14)", "options": {"A": "1962.5 cm²", "B": "3925 cm²", "C": "7850 cm²", "D": "15700 cm²"}, "correct_answer": "A"},
    {"id": 76, "difficulty": "medium", "question": "What is radius of circle with area 200.96 cm²? (π = 3.14)", "options": {"A": "4 cm", "B": "6 cm", "C": "8 cm", "D": "10 cm"}, "correct_answer": "C"},
    {"id": 77, "difficulty": "medium", "question": "If diameter is 0.7 cm, what is area? (π = 22/7)", "options": {"A": "0.385 cm²", "B": "0.77 cm²", "C": "1.54 cm²", "D": "3.08 cm²"}, "correct_answer": "A"},
    {"id": 78, "difficulty": "medium", "question": "Two circles have areas 64π and 144π. What is ratio of their diameters?", "options": {"A": "2:3", "B": "3:2", "C": "4:9", "D": "9:4"}, "correct_answer": "A"},
    {"id": 79, "difficulty": "medium", "question": "What is area of circle with circumference 132 m? (π = 22/7)", "options": {"A": "1386 m²", "B": "2772 m²", "C": "4158 m²", "D": "5544 m²"}, "correct_answer": "A"},
    {"id": 80, "difficulty": "medium", "question": "If radius increases from 3 cm to 7 cm, area increases by?", "options": {"A": "133.33%", "B": "233.33%", "C": "333.33%", "D": "433.33%"}, "correct_answer": "D"},
    
    {"id": 81, "difficulty": "hard", "question": "A circle's area is 100π cm². If radius increases by 20%, what is new area in terms of π?", "options": {"A": "120π cm²", "B": "144π cm²", "C": "160π cm²", "D": "200π cm²"}, "correct_answer": "B"},
    {"id": 82, "difficulty": "hard", "question": "If area of circle increases by 44%, what is percentage increase in radius?", "options": {"A": "20%", "B": "22%", "C": "24%", "D": "26%"}, "correct_answer": "A"},
  {"id": 83, "difficulty": "hard", "question": "Two concentric circles have radii difference 7 cm and area difference 462 cm². What is radius of smaller circle? (π = 22/7)", "options": {"A": "7 cm", "B": "14 cm", "C": "21 cm", "D": "28 cm"}, "correct_answer": "A"}
,  {"id": 84, "difficulty": "hard", "question": "If circumference of a circle equals area of another circle with radius 7 cm, what is radius of first circle? (π = 22/7)", "options": {"A": "7 cm", "B": "14 cm", "C": "21 cm", "D": "28 cm"}, "correct_answer": "B"},
    {"id": 85, "difficulty": "hard", "question": "A wire is bent to form circle of area 1386 cm². If same wire is bent to form square, what is its area? (π = 22/7)", "options": {"A": "441 cm²", "B": "484 cm²", "C": "529 cm²", "D": "576 cm²"}, "correct_answer": "A"},
    {"id": 86, "difficulty": "hard", "question": "If radius of circle increases by 50%, what is percentage increase in area?", "options": {"A": "50%", "B": "100%", "C": "125%", "D": "150%"}, "correct_answer": "C"},
    {"id": 87, "difficulty": "hard", "question": "Area of circle is 3850 cm². What is its circumference? (π = 22/7)", "options": {"A": "110 cm", "B": "220 cm", "C": "330 cm", "D": "440 cm"}, "correct_answer": "B"},
    {"id": 88, "difficulty": "hard", "question": "If area of circle is 9 times area of another circle, what is ratio of their radii?", "options": {"A": "1:3", "B": "3:1", "C": "1:9", "D": "9:1"}, "correct_answer": "B"},
    {"id": 89, "difficulty": "hard", "question": "Circumference of circle is 44 cm more than another circle, and radius is 7 cm more. What is area of larger circle? (π = 22/7)", "options": {"A": "1386 cm²", "B": "2772 cm²", "C": "4158 cm²", "D": "5544 cm²"}, "correct_answer": "A"},
    {"id": 90, "difficulty": "hard", "question": "If diameter increases by 300%, area increases by?", "options": {"A": "300%", "B": "600%", "C": "900%", "D": "1500%"}, "correct_answer": "D"},
    {"id": 91, "difficulty": "hard", "question": "Area of circle is 616 cm². What is perimeter of square with side equal to radius? (π = 22/7)", "options": {"A": "28 cm", "B": "56 cm", "C": "84 cm", "D": "112 cm"}, "correct_answer": "B"},
    {"id": 92, "difficulty": "hard", "question": "If area increases from 4π to 25π, what is percentage increase in circumference?", "options": {"A": "50%", "B": "100%", "C": "150%", "D": "250%"}, "correct_answer": "C"},
    {"id": 93, "difficulty": "hard", "question": "Two circles have radii R and r with R - r = 7 cm and R² - r² = 231 cm². What is area of larger circle? (π = 22/7)", "options": {"A": "616 cm²", "B": "1386 cm²", "C": "2464 cm²", "D": "2772 cm²"}, "correct_answer": "B"},
    {"id": 94, "difficulty": "hard", "question": "If circumference of circle equals area numerically, what is radius?", "options": {"A": "1 unit", "B": "2 units", "C": "3 units", "D": "4 units"}, "correct_answer": "B"},
    {"id": 95, "difficulty": "hard", "question": "Area of circle is 154 cm². What is area of square with side equal to diameter? (π = 22/7)", "options": {"A": "49 cm²", "B": "196 cm²", "C": "392 cm²", "D": "784 cm²"}, "correct_answer": "B"},
    {"id": 96, "difficulty": "hard", "question": "If radius decreases by 40%, area decreases by?", "options": {"A": "40%", "B": "64%", "C": "80%", "D": "96%"}, "correct_answer": "B"},
    {"id": 97, "difficulty": "hard", "question": "Area of circle is 1256 cm². If radius increases by 25%, what is new area? (π = 3.14)", "options": {"A": "1570 cm²", "B": "1962.5 cm²", "C": "2453.125 cm²", "D": "3140 cm²"}, "correct_answer": "B"},
    {"id": 98, "difficulty": "hard", "question": "If area increases by 69%, what is percentage increase in radius?", "options": {"A": "23%", "B": "30%", "C": "34.5%", "D": "69%"}, "correct_answer": "B"},
    {"id": 99, "difficulty": "hard", "question": "Circumference of circle is 88 cm. What is area of circle with radius twice as large? (π = 22/7)", "options": {"A": "2464 cm²", "B": "4928 cm²", "C": "7392 cm²", "D": "9856 cm²"}, "correct_answer": "A"},
    {"id": 100, "difficulty": "hard", "question": "If radius of circle A is 20% more than radius of circle B, area of A is what percent more than area of B?", "options": {"A": "20%", "B": "40%", "C": "44%", "D": "48%"}, "correct_answer": "C"}
 ,
    {"id":101,"difficulty":"easy","question":"What is the unit of area of a circle if radius is in cm?","options":{"A":"cm","B":"cm²","C":"cm³","D":"m²"},"correct_answer":"B"},
    {"id":102,"difficulty":"easy","question":"If radius is 2 cm, area of circle is proportional to:","options":{"A":"2","B":"4","C":"6","D":"8"},"correct_answer":"B"},
    {"id":103,"difficulty":"easy","question":"Which value of π is commonly used in calculations?","options":{"A":"22/5","B":"3","C":"22/7","D":"4"},"correct_answer":"C"},
    {"id":104,"difficulty":"easy","question":"If diameter is 8 cm, what is the radius?","options":{"A":"2 cm","B":"4 cm","C":"6 cm","D":"8 cm"},"correct_answer":"B"},
    {"id":105,"difficulty":"easy","question":"Area of a circle depends directly on:","options":{"A":"Diameter","B":"Radius","C":"Radius²","D":"Circumference"},"correct_answer":"C"},
    {"id":106,"difficulty":"easy","question":"If r = 0, area of circle is:","options":{"A":"π","B":"1","C":"0","D":"Undefined"},"correct_answer":"C"},
    {"id":107,"difficulty":"easy","question":"Which expression represents area of circle?","options":{"A":"2πr","B":"πd","C":"πr²","D":"r²"},"correct_answer":"C"},
    {"id":108,"difficulty":"easy","question":"If radius is 1 m, area equals:","options":{"A":"1 m²","B":"2π m²","C":"π m²","D":"π/2 m²"},"correct_answer":"C"},
    {"id":109,"difficulty":"easy","question":"Which quantity remains same for all circles?","options":{"A":"Radius","B":"Diameter","C":"Area","D":"π"},"correct_answer":"D"},
    {"id":110,"difficulty":"easy","question":"Area of circle with diameter 2 cm is: (π = 3.14)","options":{"A":"1.57 cm²","B":"3.14 cm²","C":"6.28 cm²","D":"12.56 cm²"},"correct_answer":"B"},

    {"id":111,"difficulty":"medium","question":"If area of a circle is 196 cm², find its radius. (π = 22/7)","options":{"A":"7 cm","B":"14 cm","C":"21 cm","D":"28 cm"},"correct_answer":"A"},
    {"id":112,"difficulty":"medium","question":"What is area of a circle whose radius is 14 cm? (π = 22/7)","options":{"A":"308 cm²","B":"616 cm²","C":"1232 cm²","D":"2464 cm²"},"correct_answer":"B"},
    {"id":113,"difficulty":"medium","question":"If radius becomes half, area becomes:","options":{"A":"Half","B":"One-fourth","C":"Double","D":"Four times"},"correct_answer":"B"},
    {"id":114,"difficulty":"medium","question":"Two circles have radii 4 cm and 6 cm. Ratio of areas is:","options":{"A":"2:3","B":"4:9","C":"9:4","D":"16:36"},"correct_answer":"B"},
    {"id":115,"difficulty":"medium","question":"If circumference is 62.8 cm, what is radius? (π = 3.14)","options":{"A":"5 cm","B":"10 cm","C":"20 cm","D":"31.4 cm"},"correct_answer":"A"},
    {"id":116,"difficulty":"medium","question":"If area of circle is 400π cm², radius is:","options":{"A":"10 cm","B":"20 cm","C":"30 cm","D":"40 cm"},"correct_answer":"B"},
    {"id":117,"difficulty":"medium","question":"If radius increases by 10%, area increases by:","options":{"A":"10%","B":"20%","C":"21%","D":"25%"},"correct_answer":"C"},
    {"id":118,"difficulty":"medium","question":"Area of circle with circumference 22 cm is: (π = 22/7)","options":{"A":"38.5 cm²","B":"77 cm²","C":"154 cm²","D":"308 cm²"},"correct_answer":"A"},
    {"id":119,"difficulty":"medium","question":"If diameter is 21 cm, find area. (π = 22/7)","options":{"A":"173.25 cm²","B":"346.5 cm²","C":"693 cm²","D":"1386 cm²"},"correct_answer":"B"},
    {"id":120,"difficulty":"medium","question":"If area of circle is 9 times another, radius is how many times?","options":{"A":"2","B":"3","C":"4","D":"9"},"correct_answer":"B"},

    {"id":121,"difficulty":"medium","question":"Area of a circle is proportional to square of:","options":{"A":"Diameter","B":"Circumference","C":"Radius","D":"π"},"correct_answer":"C"},
    {"id":122,"difficulty":"medium","question":"If radius is multiplied by 5, area becomes:","options":{"A":"5 times","B":"10 times","C":"15 times","D":"25 times"},"correct_answer":"D"},
    {"id":123,"difficulty":"medium","question":"Find area of circle with r = 0.35 m. (π = 22/7)","options":{"A":"0.385 m²","B":"0.77 m²","C":"1.54 m²","D":"3.08 m²"},"correct_answer":"A"},
    {"id":124,"difficulty":"medium","question":"If circumference doubles, area becomes:","options":{"A":"Double","B":"Triple","C":"Four times","D":"Eight times"},"correct_answer":"C"},
    {"id":125,"difficulty":"medium","question":"If area is 314 cm², find r. (π = 3.14)","options":{"A":"5 cm","B":"10 cm","C":"15 cm","D":"20 cm"},"correct_answer":"B"},
    {"id":126,"difficulty":"medium","question":"Two circles have diameters in ratio 1:2. Ratio of areas is:","options":{"A":"1:2","B":"1:3","C":"1:4","D":"1:8"},"correct_answer":"C"},
    {"id":127,"difficulty":"medium","question":"Area of a circle is 64π cm². What is diameter?","options":{"A":"8 cm","B":"12 cm","C":"16 cm","D":"24 cm"},"correct_answer":"C"},
    {"id":128,"difficulty":"medium","question":"If radius decreases by 50%, area decreases by:","options":{"A":"25%","B":"50%","C":"75%","D":"100%"},"correct_answer":"C"},
    {"id":129,"difficulty":"medium","question":"If r₁:r₂ = 5:7, area ratio is:","options":{"A":"5:7","B":"7:5","C":"25:49","D":"49:25"},"correct_answer":"C"},
    {"id":130,"difficulty":"medium","question":"Area of circle with diameter 70 cm is: (π = 22/7)","options":{"A":"3850 cm²","B":"7700 cm²","C":"15400 cm²","D":"30800 cm²"},"correct_answer":"A"},

    {"id":131,"difficulty":"hard","question":"Area of circle increases from 16π to 36π. Find % increase in radius.","options":{"A":"25%","B":"50%","C":"75%","D":"100%"},"correct_answer":"B"},
    {"id":132,"difficulty":"hard","question":"If circumference of a circle is numerically equal to its area, radius is:","options":{"A":"1 unit","B":"2 units","C":"3 units","D":"4 units"},"correct_answer":"B"},
    {"id":133,"difficulty":"hard","question":"Two concentric circles have radii 7 cm and 14 cm. Find area between them. (π = 22/7)","options":{"A":"462 cm²","B":"616 cm²","C":"924 cm²","D":"1540 cm²"},"correct_answer":"D"},
    {"id":134,"difficulty":"hard","question":"If area of circle is 484π cm², circumference is:","options":{"A":"22π cm","B":"44π cm","C":"88π cm","D":"96π cm"},"correct_answer":"B"},
    {"id":135,"difficulty":"hard","question":"If radius increases by x%, area increases by 44%. Find x.","options":{"A":"20%","B":"22%","C":"25%","D":"30%"},"correct_answer":"A"},
    {"id":136,"difficulty":"hard","question":"Area of circle A is 49 times area of B. Ratio of radii is:","options":{"A":"7:1","B":"49:1","C":"1:7","D":"1:49"},"correct_answer":"A"},
    {"id":137,"difficulty":"hard","question":"Circumference of circle is 154 cm. Find area. (π = 22/7)","options":{"A":"616 cm²","B":"1232 cm²","C":"1540 cm²","D":"3080 cm²"},"correct_answer":"C"},
    {"id":138,"difficulty":"hard","question":"If radius of circle is increased by 30%, area increases by:","options":{"A":"30%","B":"60%","C":"69%","D":"90%"},"correct_answer":"C"},
    {"id":139,"difficulty":"hard","question":"Area of a circle is 400π. Find circumference.","options":{"A":"20π","B":"40π","C":"80π","D":"160π"},"correct_answer":"B"},
    {"id":140,"difficulty":"hard","question":"If diameter is increased by 200%, area increases by:","options":{"A":"200%","B":"400%","C":"800%","D":"1200%"},"correct_answer":"C"},

    {"id":141,"difficulty":"hard","question":"Area of circle A is 144π and B is 64π. Find difference of radii.","options":{"A":"2 units","B":"4 units","C":"6 units","D":"8 units"},"correct_answer":"B"},
    {"id":142,"difficulty":"hard","question":"If circumference of circle is doubled, percentage increase in area is:","options":{"A":"100%","B":"200%","C":"300%","D":"400%"},"correct_answer":"C"},
    {"id":143,"difficulty":"hard","question":"Area of a circle is 121π. Find its diameter.","options":{"A":"11","B":"22","C":"44","D":"121"},"correct_answer":"B"},
    {"id":144,"difficulty":"hard","question":"Two circles have same circumference. Their areas are:","options":{"A":"Equal","B":"Different","C":"In ratio 2:1","D":"Cannot be compared"},"correct_answer":"A"},
    {"id":145,"difficulty":"hard","question":"If area of a circle is 50.24 cm², find circumference. (π = 3.14)","options":{"A":"25.12 cm","B":"31.4 cm","C":"44 cm","D":"62.8 cm"},"correct_answer":"B"},
    {"id":146,"difficulty":"hard","question":"Area increases by 156%. Radius increases by:","options":{"A":"25%","B":"50%","C":"75%","D":"100%"},"correct_answer":"B"},
    {"id":147,"difficulty":"hard","question":"If radius of a circle is tripled, percentage increase in area is:","options":{"A":"200%","B":"300%","C":"600%","D":"800%"},"correct_answer":"D"},
    {"id":148,"difficulty":"hard","question":"Area of circle is 2464 cm². Find radius. (π = 22/7)","options":{"A":"14 cm","B":"21 cm","C":"28 cm","D":"35 cm"},"correct_answer":"C"},
    {"id":149,"difficulty":"hard","question":"If radius is increased from 10 cm to 15 cm, find % increase in area.","options":{"A":"50%","B":"100%","C":"125%","D":"225%"},"correct_answer":"C"},
    {"id":150,"difficulty":"hard","question":"Two circles have area ratio 16:25. Ratio of circumferences is:","options":{"A":"4:5","B":"5:4","C":"16:25","D":"25:16"},"correct_answer":"A"}
   ]
}