{
  "title": "Basic Terms and Definitions - Grade 9 CBSE",
  "total_questions": 100,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "A point has:", "options": {"A": "Length", "B": "Breadth", "C": "Position only", "D": "Area"}, "correct_answer": "C"},
    {"id": 2, "difficulty": "easy", "question": "A line segment has:", "options": {"A": "Two endpoints", "B": "One endpoint", "C": "No endpoints", "D": "Infinite endpoints"}, "correct_answer": "A"},
    {"id": 3, "difficulty": "easy", "question": "A ray has:", "options": {"A": "Two endpoints", "B": "One endpoint", "C": "No endpoints", "D": "Variable endpoints"}, "correct_answer": "B"},
    {"id": 4, "difficulty": "easy", "question": "A line has:", "options": {"A": "Two endpoints", "B": "One endpoint", "C": "No endpoints", "D": "Three endpoints"}, "correct_answer": "C"},
    {"id": 5, "difficulty": "easy", "question": "Two lines that never meet are called:", "options": {"A": "Intersecting", "B": "Parallel", "C": "Perpendicular", "D": "Concurrent"}, "correct_answer": "B"},
    {"id": 6, "difficulty": "easy", "question": "Angle measuring 90° is called:", "options": {"A": "Acute", "B": "Obtuse", "C": "Right", "D": "Straight"}, "correct_answer": "C"},
    {"id": 7, "difficulty": "easy", "question": "Angle between 0° and 90° is:", "options": {"A": "Acute", "B": "Obtuse", "C": "Right", "D": "Straight"}, "correct_answer": "A"},
    {"id": 8, "difficulty": "easy", "question": "Angle between 90° and 180° is:", "options": {"A": "Acute", "B": "Obtuse", "C": "Right", "D": "Straight"}, "correct_answer": "B"},
    {"id": 9, "difficulty": "easy", "question": "Angle exactly 180° is:", "options": {"A": "Acute", "B": "Obtuse", "C": "Right", "D": "Straight"}, "correct_answer": "D"},
    {"id": 10, "difficulty": "easy", "question": "Two angles summing to 90° are:", "options": {"A": "Supplementary", "B": "Complementary", "C": "Adjacent", "D": "Vertical"}, "correct_answer": "B"},
    {"id": 11, "difficulty": "easy", "question": "Two angles summing to 180° are:", "options": {"A": "Supplementary", "B": "Complementary", "C": "Adjacent", "D": "Vertical"}, "correct_answer": "A"},
    {"id": 12, "difficulty": "easy", "question": "Angles sharing a common vertex and side are:", "options": {"A": "Supplementary", "B": "Complementary", "C": "Adjacent", "D": "Vertical"}, "correct_answer": "C"},
    {"id": 13, "difficulty": "easy", "question": "Angles opposite each other when two lines intersect are:", "options": {"A": "Supplementary", "B": "Complementary", "C": "Adjacent", "D": "Vertical"}, "correct_answer": "D"},
    {"id": 14, "difficulty": "easy", "question": "Lines meeting at right angles are:", "options": {"A": "Parallel", "B": "Perpendicular", "C": "Intersecting", "D": "Collinear"}, "correct_answer": "B"},
    {"id": 15, "difficulty": "easy", "question": "Points on same line are:", "options": {"A": "Collinear", "B": "Coplanar", "C": "Concurrent", "D": "Parallel"}, "correct_answer": "A"},
    {"id": 16, "difficulty": "easy", "question": "An angle bisector divides angle into:", "options": {"A": "Three equal parts", "B": "Two equal parts", "C": "Four equal parts", "D": "Any two parts"}, "correct_answer": "B"},
    {"id": 17, "difficulty": "easy", "question": "Instrument to measure angles:", "options": {"A": "Ruler", "B": "Compass", "C": "Protractor", "D": "Divider"}, "correct_answer": "C"},
    {"id": 18, "difficulty": "easy", "question": "Two lines in same plane that don't intersect:", "options": {"A": "Perpendicular", "B": "Parallel", "C": "Intersecting", "D": "Skew"}, "correct_answer": "B"},
    {"id": 19, "difficulty": "easy", "question": "Angle greater than 180° but less than 360°:", "options": {"A": "Reflex", "B": "Obtuse", "C": "Straight", "D": "Complete"}, "correct_answer": "A"},
    {"id": 20, "difficulty": "easy", "question": "360° angle is called:", "options": {"A": "Right", "B": "Straight", "C": "Complete", "D": "Reflex"}, "correct_answer": "C"},
    
    {"id": 21, "difficulty": "medium", "question": "If two lines intersect, how many angles are formed?", "options": {"A": "2", "B": "4", "C": "6", "D": "8"}, "correct_answer": "B"},
    {"id": 22, "difficulty": "medium", "question": "If three lines intersect at one point, they are:", "options": {"A": "Parallel", "B": "Perpendicular", "C": "Concurrent", "D": "Collinear"}, "correct_answer": "C"},
    {"id": 23, "difficulty": "medium", "question": "Two adjacent angles whose non-common arms form a straight line:", "options": {"A": "Complementary", "B": "Supplementary", "C": "Linear pair", "D": "Vertical angles"}, "correct_answer": "C"},
    {"id": 24, "difficulty": "medium", "question": "If ∠A and ∠B are complementary and ∠A = 35°, then ∠B = ?", "options": {"A": "45°", "B": "55°", "C": "65°", "D": "145°"}, "correct_answer": "B"},
    {"id": 25, "difficulty": "medium", "question": "If ∠P and ∠Q are supplementary and ∠P = 110°, then ∠Q = ?", "options": {"A": "70°", "B": "80°", "C": "90°", "D": "100°"}, "correct_answer": "A"},
    {"id": 26, "difficulty": "medium", "question": "Vertical angles are always:", "options": {"A": "Complementary", "B": "Supplementary", "C": "Equal", "D": "Adjacent"}, "correct_answer": "C"},
    {"id": 27, "difficulty": "medium", "question": "If two lines are perpendicular, they form angles of:", "options": {"A": "45°", "B": "90°", "C": "180°", "D": "360°"}, "correct_answer": "B"},
    {"id": 28, "difficulty": "medium", "question": "How many degrees in a straight angle?", "options": {"A": "90", "B": "180", "C": "270", "D": "360"}, "correct_answer": "B"},
    {"id": 29, "difficulty": "medium", "question": "An angle measuring 270° is what type?", "options": {"A": "Acute", "B": "Obtuse", "C": "Reflex", "D": "Complete"}, "correct_answer": "C"},
    {"id": 30, "difficulty": "medium", "question": "Two angles are complementary. One is 20° more than other. Find smaller.", "options": {"A": "25°", "B": "35°", "C": "45°", "D": "55°"}, "correct_answer": "B"},
    {"id": 31, "difficulty": "medium", "question": "If ray stands on line, sum of adjacent angles is:", "options": {"A": "90°", "B": "180°", "C": "270°", "D": "360°"}, "correct_answer": "B"},
    {"id": 32, "difficulty": "medium", "question": "How many endpoints does a line have?", "options": {"A": "0", "B": "1", "C": "2", "D": "Infinite"}, "correct_answer": "A"},
    {"id": 33, "difficulty": "medium", "question": "If ∠A = 47°, its complement is:", "options": {"A": "43°", "B": "53°", "C": "133°", "D": "323°"}, "correct_answer": "A"},
    {"id": 34, "difficulty": "medium", "question": "If ∠B = 123°, its supplement is:", "options": {"A": "47°", "B": "57°", "C": "67°", "D": "77°"}, "correct_answer": "B"},
    {"id": 35, "difficulty": "medium", "question": "Two supplementary angles differ by 40°. Find larger.", "options": {"A": "70°", "B": "90°", "C": "110°", "D": "130°"}, "correct_answer": "C"},
    {"id": 36, "difficulty": "medium", "question": "Point dividing line segment into two equal parts:", "options": {"A": "Endpoint", "B": "Midpoint", "C": "Vertex", "D": "Intersection"}, "correct_answer": "B"},
    {"id": 37, "difficulty": "medium", "question": "Lines not in same plane that don't intersect:", "options": {"A": "Parallel", "B": "Perpendicular", "C": "Skew", "D": "Concurrent"}, "correct_answer": "C"},
    {"id": 38, "difficulty": "medium", "question": "If ∠X and ∠Y form linear pair and ∠X = 75°, then ∠Y = ?", "options": {"A": "15°", "B": "75°", "C": "105°", "D": "285°"}, "correct_answer": "C"},
    {"id": 39, "difficulty": "medium", "question": "Instrument to draw circles:", "options": {"A": "Ruler", "B": "Protractor", "C": "Compass", "D": "Divider"}, "correct_answer": "C"},
    {"id": 40, "difficulty": "medium", "question": "Two complementary angles are in ratio 2:3. Find larger.", "options": {"A": "36°", "B": "54°", "C": "60°", "D": "72°"}, "correct_answer": "B"},
    {"id": 41, "difficulty": "medium", "question": "How many points determine a line?", "options": {"A": "1", "B": "2", "C": "3", "D": "4"}, "correct_answer": "B"},
    {"id": 42, "difficulty": "medium", "question": "If two lines intersect at 90°, they are:", "options": {"A": "Parallel", "B": "Perpendicular", "C": "Skew", "D": "Concurrent"}, "correct_answer": "B"},
    {"id": 43, "difficulty": "medium", "question": "Angle equal to its supplement is:", "options": {"A": "30°", "B": "60°", "C": "90°", "D": "120°"}, "correct_answer": "C"},
    {"id": 44, "difficulty": "medium", "question": "Angle equal to its complement is:", "options": {"A": "30°", "B": "45°", "C": "60°", "D": "90°"}, "correct_answer": "B"},
    {"id": 45, "difficulty": "medium", "question": "Two supplementary angles are in ratio 4:5. Find smaller.", "options": {"A": "60°", "B": "80°", "C": "100°", "D": "120°"}, "correct_answer": "B"},
    {"id": 46, "difficulty": "medium", "question": "How many degrees in 3/4 of complete angle?", "options": {"A": "90°", "B": "180°", "C": "270°", "D": "360°"}, "correct_answer": "C"},
    {"id": 47, "difficulty": "medium", "question": "If ∠A = 27.5°, its complement is:", "options": {"A": "62.5°", "B": "72.5°", "C": "152.5°", "D": "207.5°"}, "correct_answer": "A"},
    {"id": 48, "difficulty": "medium", "question": "Two lines intersect forming four angles. If one is 45°, adjacent angle is:", "options": {"A": "45°", "B": "90°", "C": "135°", "D": "180°"}, "correct_answer": "C"},
    {"id": 49, "difficulty": "medium", "question": "Angle between North and East is:", "options": {"A": "45°", "B": "90°", "C": "135°", "D": "180°"}, "correct_answer": "B"},
    {"id": 50, "difficulty": "medium", "question": "Two angles making linear pair are always:", "options": {"A": "Equal", "B": "Supplementary", "C": "Complementary", "D": "Acute"}, "correct_answer": "B"},
    {"id": 51, "difficulty": "medium", "question": "If three points are collinear, they lie on:", "options": {"A": "Same plane", "B": "Same line", "C": "Same circle", "D": "Different lines"}, "correct_answer": "B"},
    {"id": 52, "difficulty": "medium", "question": "Angle between hour and minute hand at 3:00:", "options": {"A": "45°", "B": "90°", "C": "135°", "D": "180°"}, "correct_answer": "B"},
    {"id": 53, "difficulty": "medium", "question": "How many endpoints does ray AB have?", "options": {"A": "0", "B": "1", "C": "2", "D": "Infinite"}, "correct_answer": "B"},
    {"id": 54, "difficulty": "medium", "question": "Two lines intersect. If one angle is 60°, vertically opposite angle is:", "options": {"A": "30°", "B": "60°", "C": "120°", "D": "180°"}, "correct_answer": "B"},
    {"id": 55, "difficulty": "medium", "question": "Complement of 89° is:", "options": {"A": "1°", "B": "91°", "C": "179°", "D": "271°"}, "correct_answer": "A"},
    {"id": 56, "difficulty": "medium", "question": "Supplement of 179° is:", "options": {"A": "1°", "B": "91°", "C": "181°", "D": "359°"}, "correct_answer": "A"},
    {"id": 57, "difficulty": "medium", "question": "If ∠A and ∠B are supplementary and ∠A = 2∠B, find ∠A.", "options": {"A": "60°", "B": "90°", "C": "120°", "D": "150°"}, "correct_answer": "C"},
    {"id": 58, "difficulty": "medium", "question": "Two complementary angles differ by 12°. Find larger.", "options": {"A": "39°", "B": "51°", "C": "45°", "D": "57°"}, "correct_answer": "B"},
    {"id": 59, "difficulty": "medium", "question": "If ∠P = 135°, its reflex angle is:", "options": {"A": "45°", "B": "135°", "C": "225°", "D": "315°"}, "correct_answer": "C"},
    {"id": 60, "difficulty": "medium", "question": "How many right angles in complete angle?", "options": {"A": "2", "B": "3", "C": "4", "D": "5"}, "correct_answer": "C"},
    {"id": 61, "difficulty": "medium", "question": "Two lines intersect. Sum of all four angles formed:", "options": {"A": "180°", "B": "270°", "C": "360°", "D": "540°"}, "correct_answer": "C"},
    {"id": 62, "difficulty": "medium", "question": "Angle between North and South:", "options": {"A": "45°", "B": "90°", "C": "135°", "D": "180°"}, "correct_answer": "D"},
    {"id": 63, "difficulty": "medium", "question": "If two angles are both complementary and equal, each is:", "options": {"A": "30°", "B": "45°", "C": "60°", "D": "90°"}, "correct_answer": "B"},
    {"id": 64, "difficulty": "medium", "question": "If two angles are both supplementary and equal, each is:", "options": {"A": "30°", "B": "60°", "C": "90°", "D": "120°"}, "correct_answer": "C"},
    {"id": 65, "difficulty": "medium", "question": "Instrument to measure length:", "options": {"A": "Protractor", "B": "Compass", "C": "Ruler", "D": "Divider"}, "correct_answer": "C"},
    {"id": 66, "difficulty": "medium", "question": "Two supplementary angles are in ratio 7:8. Find smaller.", "options": {"A": "84°", "B": "96°", "C": "72°", "D": "108°"}, "correct_answer": "A"},
    {"id": 67, "difficulty": "medium", "question": "If ∠X = 78.5°, its supplement is:", "options": {"A": "11.5°", "B": "101.5°", "C": "168.5°", "D": "258.5°"}, "correct_answer": "B"},
    {"id": 68, "difficulty": "medium", "question": "Two lines intersect. If one angle is 35°, adjacent angle is:", "options": {"A": "35°", "B": "55°", "C": "145°", "D": "180°"}, "correct_answer": "C"},
    {"id": 69, "difficulty": "medium", "question": "Angle between East and South:", "options": {"A": "45°", "B": "90°", "C": "135°", "D": "180°"}, "correct_answer": "B"},
    {"id": 70, "difficulty": "medium", "question": "Linear pair always forms:", "options": {"A": "Acute angles", "B": "Right angles", "C": "Straight line", "D": "Complete angle"}, "correct_answer": "C"},
    {"id": 71, "difficulty": "medium", "question": "If four points are coplanar, they lie on:", "options": {"A": "Same line", "B": "Same plane", "C": "Same circle", "D": "Different planes"}, "correct_answer": "B"},
    {"id": 72, "difficulty": "medium", "question": "Angle between hour and minute hand at 6:00:", "options": {"A": "90°", "B": "120°", "C": "150°", "D": "180°"}, "correct_answer": "D"},
    {"id": 73, "difficulty": "medium", "question": "How many endpoints does line segment CD have?", "options": {"A": "0", "B": "1", "C": "2", "D": "Infinite"}, "correct_answer": "C"},
    {"id": 74, "difficulty": "medium", "question": "Two lines intersect. If one angle is 85°, vertically opposite angle is:", "options": {"A": "5°", "B": "85°", "C": "95°", "D": "175°"}, "correct_answer": "B"},
    {"id": 75, "difficulty": "medium", "question": "Complement of 0.5° is:", "options": {"A": "89.5°", "B": "90.5°", "C": "179.5°", "D": "359.5°"}, "correct_answer": "A"},
    {"id": 76, "difficulty": "medium", "question": "Supplement of 0.5° is:", "options": {"A": "89.5°", "B": "90.5°", "C": "179.5°", "D": "359.5°"}, "correct_answer": "C"},
    {"id": 77, "difficulty": "medium", "question": "If ∠A and ∠B are complementary and ∠A = 3∠B, find ∠A.", "options": {"A": "22.5°", "B": "45°", "C": "67.5°", "D": "90°"}, "correct_answer": "C"},
    {"id": 78, "difficulty": "medium", "question": "Two supplementary angles differ by 50°. Find larger.", "options": {"A": "65°", "B": "85°", "C": "105°", "D": "115°"}, "correct_answer": "D"},
    {"id": 79, "difficulty": "medium", "question": "If ∠P = 200°, its reflex angle is:", "options": {"A": "20°", "B": "160°", "C": "200°", "D": "340°"}, "correct_answer": "B"},
    {"id": 80, "difficulty": "medium", "question": "How many straight angles in complete angle?", "options": {"A": "1", "B": "2", "C": "3", "D": "4"}, "correct_answer": "B"},
    
    {"id": 81, "difficulty": "hard", "question": "If three lines intersect pairwise, maximum number of intersection points:", "options": {"A": "1", "B": "2", "C": "3", "D": "4"}, "correct_answer": "C"},
    {"id": 82, "difficulty": "hard", "question": "Two lines are perpendicular. If one is rotated by 15°, angle between them becomes:", "options": {"A": "75° or 105°", "B": "85° or 95°", "C": "90° only", "D": "15° or 165°"}, "correct_answer": "A"},
    {"id": 83, "difficulty": "hard", "question": "If an angle is 14° more than its complement, find the angle.", "options": {"A": "38°", "B": "52°", "C": "64°", "D": "76°"}, "correct_answer": "B"},
    {"id": 84, "difficulty": "hard", "question": "If an angle is 30° less than its supplement, find the angle.", "options": {"A": "60°", "B": "75°", "C": "90°", "D": "105°"}, "correct_answer": "B"},
    {"id": 85, "difficulty": "hard", "question": "The supplement of an angle is three times its complement. Find the angle.", "options": {"A": "30°", "B": "45°", "C": "60°", "D": "75°"}, "correct_answer": "B"},
    {"id": 86, "difficulty": "hard", "question": "If two complementary angles are in ratio 7:11, find the difference between them.", "options": {"A": "20°", "B": "30°", "C": "40°", "D": "50°"}, "correct_answer": "C"},
    {"id": 87, "difficulty": "hard", "question": "An angle's supplement is 5 times its complement. Find the angle.", "options": {"A": "30°", "B": "45°", "C": "60°", "D": "67.5°"}, "correct_answer": "D"},
    {"id": 88, "difficulty": "hard", "question": "If the difference between two supplementary angles is 40°, find the smaller angle.", "options": {"A": "60°", "B": "70°", "C": "80°", "D": "90°"}, "correct_answer": "B"},
    {"id": 89, "difficulty": "hard", "question": "The measure of an angle is twice its complementary angle. Find the angle.", "options": {"A": "30°", "B": "45°", "C": "60°", "D": "90°"}, "correct_answer": "C"},
    {"id": 90, "difficulty": "hard", "question": "If an angle's supplement and complement are in ratio 5:2, find the angle.", "options": {"A": "30°", "B": "45°", "C": "60°", "D": "75°"}, "correct_answer": "A"},
    {"id": 91, "difficulty": "hard", "question": "Two lines intersect. If one angle is (2x + 10)° and adjacent angle is (3x - 20)°, find x.", "options": {"A": "30", "B": "35", "C": "38", "D": "42"}, "correct_answer": "C"},
    {"id": 92, "difficulty": "hard", "question": "If three angles around a point are in ratio 2:3:4, find largest angle.", "options": {"A": "80°", "B": "100°", "C": "120°", "D": "160°"}, "correct_answer": "D"},
    {"id": 93, "difficulty": "hard", "question": "An angle is 10° more than one-third of its supplement. Find the angle.", "options": {"A": "40°", "B": "50°", "C": "60°", "D": "70°"}, "correct_answer": "B"},
    {"id": 94, "difficulty": "hard", "question": "If the complement of an angle is one-fourth of its supplement, find the angle.", "options": {"A": "30°", "B": "45°", "C": "60°", "D": "75°"}, "correct_answer": "C"},
    {"id": 95, "difficulty": "hard", "question": "Two lines intersect forming four angles. If one angle is (5x - 20)° and vertically opposite is (3x + 40)°, find x.", "options": {"A": "10", "B": "20", "C": "30", "D": "40"}, "correct_answer": "C"},
    {"id": 96, "difficulty": "hard", "question": "If an angle's measure is 2/3 of its supplement, find the angle.", "options": {"A": "60°", "B": "72°", "C": "84°", "D": "96°"}, "correct_answer": "B"},
    {"id": 97, "difficulty": "hard", "question": "The supplement of an angle exceeds the angle by 60°. Find the angle's complement.", "options": {"A": "15°", "B": "30°", "C": "45°", "D": "60°"}, "correct_answer": "B"},
    {"id": 98, "difficulty": "hard", "question": "If two complementary angles are such that one is 10° less than three times the other, find larger.", "options": {"A": "55°", "B": "60°", "C": "65°", "D": "70°"}, "correct_answer": "C"},
    {"id": 99, "difficulty": "hard", "question": "An angle's supplement is 20° more than twice its complement. Find the angle.", "options": {"A": "20°", "B": "30°", "C": "40°", "D": "50°"}, "correct_answer": "A"},
    {"id": 100, "difficulty": "hard", "question": "If three angles at a point make 360° and are in ratio 1:2:3, find middle angle.", "options": {"A": "60°", "B": "80°", "C": "100°", "D": "120°"}, "correct_answer": "D"}
  ]
}