{
  "title": "Graphical Representation of Data - Grade 9 ICSE",
  "total_questions": 60,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "📊 Which graph uses bars of equal width to show data? ", "options": {"A": "Line Graph", "B": "Bar Graph", "C": "Pie Chart", "D": "Histogram"}, "correct_answer": "B"},
    {"id": 2, "difficulty": "easy", "question": "🥧 What is a pie chart also called? ", "options": {"A": "Bar Diagram", "B": "Circle Graph", "C": "Line Plot", "D": "Pictograph"}, "correct_answer": "B"},
    {"id": 3, "difficulty": "easy", "question": "📈 A graph that shows change over time is best displayed by a... ", "options": {"A": "Bar Graph", "B": "Pie Chart", "C": "Line Graph", "D": "Histogram"}, "correct_answer": "C"},
    {"id": 4, "difficulty": "easy", "question": "🔢 In a bar graph, the height of the bar represents... ", "options": {"A": "Its color", "B": "Its width", "C": "Its frequency/value", "D": "Its label"}, "correct_answer": "C"},
    {"id": 5, "difficulty": "easy", "question": "📊 What does each slice of a pie chart represent? ", "options": {"A": "A different color", "B": "A part of a whole", "C": "A point in time", "D": "A bar's height"}, "correct_answer": "B"},
    {"id": 6, "difficulty": "easy", "question": "✅ Which graph is used to compare parts of a whole? ", "options": {"A": "Bar Graph", "B": "Line Graph", "C": "Pie Chart", "D": "Frequency Polygon"}, "correct_answer": "C"},
    {"id": 7, "difficulty": "easy", "question": "📊 The horizontal line at the bottom of a graph is called the... ", "options": {"A": "Y-axis", "B": "Vertical axis", "C": "X-axis", "D": "Title line"}, "correct_answer": "C"},
    {"id": 8, "difficulty": "easy", "question": "📈 The vertical line on the left of a graph is called the... ", "options": {"A": "X-axis", "B": "Y-axis", "C": "Slant axis", "D": "Base axis"}, "correct_answer": "B"},
    {"id": 9, "difficulty": "easy", "question": "🍎🍌🍇 If you want to show favorite fruits of a class, which graph is good? ", "options": {"A": "Line Graph", "B": "Bar Graph or Pie Chart", "C": "Scatter Plot", "D": "Ogive"}, "correct_answer": "B"},
    {"id": 10, "difficulty": "easy", "question": "🎯 What must every graph have? ", "options": {"A": "A Title", "B": "Pretty colors", "C": "At least 10 bars", "D": "A border"}, "correct_answer": "A"},
    {"id": 11, "difficulty": "easy", "question": "📐 In a bar graph, the space between two bars should be... ", "options": {"A": "Very large", "B": "Zero (no space)", "C": "Equal", "D": "Different for each bar"}, "correct_answer": "C"},
    {"id": 12, "difficulty": "easy", "question": "🥧 In a pie chart, the total angle of the circle is... ", "options": {"A": "90 degrees", "B": "180 degrees", "C": "360 degrees", "D": "100 degrees"}, "correct_answer": "C"},
    {"id": 13, "difficulty": "easy", "question": "📊 What type of data is a pictograph used for? ", "options": {"A": "Very complex data", "B": "Data that can be shown with pictures/symbols", "C": "Only scientific data", "D": "Data over time"}, "correct_answer": "B"},
    {"id": 14, "difficulty": "easy", "question": "📈 On a line graph, data points are connected by... ", "options": {"A": "Bars", "B": "Slices", "C": "Straight lines", "D": "Dots only"}, "correct_answer": "C"},
    {"id": 15, "difficulty": "easy", "question": "✅ A double bar graph is used to... ", "options": {"A": "Show data for one item", "B": "Compare two sets of data", "C": "Show a whole divided", "D": "Show change over decades"}, "correct_answer": "B"},
    {"id": 16, "difficulty": "easy", "question": "🎨 What should the scale on an axis be? ", "options": {"A": "Random", "B": "Uniform/Equal", "C": "Changing every time", "D": "Very small"}, "correct_answer": "B"},
    {"id": 17, "difficulty": "easy", "question": "📊 If a bar reaches the value 50 on the y-axis, what does it mean? ", "options": {"A": "The bar is 50 cm tall", "B": "The data value is 50", "C": "There are 50 bars", "D": "The scale is 50"}, "correct_answer": "B"},
    {"id": 18, "difficulty": "easy", "question": "🥧 For a pie chart, the size of a sector depends on... ", "options": {"A": "Its color", "B": "Its frequency relative to total", "C": "The time it represents", "D": "The order of data"}, "correct_answer": "B"},
    {"id": 19, "difficulty": "easy", "question": "🎯 What is the first step in drawing a bar graph? ", "options": {"A": "Draw the bars", "B": "Color the graph", "C": "Draw the two axes", "D": "Write the title"}, "correct_answer": "C"},
    {"id": 20, "difficulty": "easy", "question": "📈 A graph showing temperature over a week is best as a... ", "options": {"A": "Pie Chart", "B": "Bar Graph", "C": "Line Graph", "D": "Pictograph"}, "correct_answer": "C"},
    {"id": 21, "difficulty": "medium", "question": "📊 In a bar graph, if the scale is 1 cm = 5 students, how tall is a bar for 25 students? ", "options": {"A": "2 cm", "B": "5 cm", "C": "10 cm", "D": "25 cm"}, "correct_answer": "B"},
    {"id": 22, "difficulty": "medium", "question": "🥧 In a pie chart for 30 students, 12 like cricket. What is the angle of the cricket sector? ", "options": {"A": "90°", "B": "120°", "C": "144°", "D": "180°"}, "correct_answer": "C"},
    {"id": 23, "difficulty": "medium", "question": "📈 For data: Months on x-axis, Sales on y-axis. Which graph is suitable? ", "options": {"A": "Bar Graph or Line Graph", "B": "Only Pie Chart", "C": "Only Histogram", "D": "Only Pictograph"}, "correct_answer": "A"},
    {"id": 24, "difficulty": "medium", "question": "🎯 To show the percentage of budget spent on different items, use a... ", "options": {"A": "Line Graph", "B": "Bar Graph", "C": "Pie Chart", "D": "Frequency Polygon"}, "correct_answer": "C"},
    {"id": 25, "difficulty": "medium", "question": "📊 What is the class mark used for in a frequency polygon? ", "options": {"A": "As the height of a bar", "B": "As a point on the graph", "C": "As a sector angle", "D": "As a scale factor"}, "correct_answer": "B"},
    {"id": 26, "difficulty": "medium", "question": "🔢 If total frequency is 80 and one item's frequency is 20, its pie chart angle is? ", "options": {"A": "20°", "B": "45°", "C": "90°", "D": "180°"}, "correct_answer": "C"},
    {"id": 27, "difficulty": "medium", "question": "📈 A histogram is different from a bar graph because it has... ", "options": {"A": "No spaces between bars", "B": "Spaces between bars", "C": "Sectors", "D": "Connected lines"}, "correct_answer": "A"},
    {"id": 28, "difficulty": "medium", "question": "🎨 In a pictograph, if one symbol represents 10 books, how many symbols for 45 books? ", "options": {"A": "4", "B": "4.5", "C": "5", "D": "45"}, "correct_answer": "B"},
    {"id": 29, "difficulty": "medium", "question": "📊 When comparing sales of two years for multiple products, use a... ", "options": {"A": "Simple Bar Graph", "B": "Double Bar Graph", "C": "Pie Chart", "D": "Line Graph"}, "correct_answer": "B"},
    {"id": 30, "difficulty": "medium", "question": "🥧 For a data item, angle in pie chart = (Frequency / Total Frequency) * ? ", "options": {"A": "90", "B": "180", "C": "360", "D": "100"}, "correct_answer": "C"},
    {"id": 31, "difficulty": "medium", "question": "📈 A line graph is also called a... ", "options": {"A": "Time Series Graph", "B": "Circle Graph", "C": "Bar Diagram", "D": "Frequency Curve"}, "correct_answer": "A"},
    {"id": 32, "difficulty": "medium", "question": "📊 If the scale on y-axis is 1 unit = 2 kg, a bar reaching 7 units means... ", "options": {"A": "7 kg", "B": "14 kg", "C": "3.5 kg", "D": "2 kg"}, "correct_answer": "B"},
    {"id": 33, "difficulty": "medium", "question": "✅ The main advantage of a graph over a table is... ", "options": {"A": "It takes more space", "B": "It is less accurate", "C": "It gives a quick visual impression", "D": "It has more numbers"}, "correct_answer": "C"},
    {"id": 34, "difficulty": "medium", "question": "🎯 Which graph is used for frequency distribution of continuous grouped data? ", "options": {"A": "Bar Graph", "B": "Pie Chart", "C": "Histogram", "D": "Pictograph"}, "correct_answer": "C"},
    {"id": 35, "difficulty": "medium", "question": "📐 In a histogram, the area of each bar represents... ", "options": {"A": "Class mark", "B": "Frequency", "C": "Range", "D": "Class size"}, "correct_answer": "B"},
    {"id": 36, "difficulty": "medium", "question": "🥧 If a pie chart sector is 72°, what percentage of the whole is it? ", "options": {"A": "10%", "B": "20%", "C": "30%", "D": "72%"}, "correct_answer": "B"},
    {"id": 37, "difficulty": "medium", "question": "📊 To show the growth of a plant over months, use a... ", "options": {"A": "Bar Graph", "B": "Line Graph", "C": "Pie Chart", "D": "Histogram"}, "correct_answer": "B"},
    {"id": 38, "difficulty": "medium", "question": "🔢 In a component bar graph, each bar is... ", "options": {"A": "Split into parts", "B": "Very thin", "C": "A circle", "D": "Connected by lines"}, "correct_answer": "A"},
    {"id": 39, "difficulty": "medium", "question": "🎨 What is a disadvantage of a pictograph? ", "options": {"A": "It is visually appealing", "B": "It can be hard to show fractions of symbols", "C": "It is easy to draw", "D": "It uses colors"}, "correct_answer": "B"},
    {"id": 40, "difficulty": "medium", "question": "📈 In a line graph, if the line goes up from left to right, it shows... ", "options": {"A": "Decrease", "B": "Increase", "C": "No change", "D": "Cyclic change"}, "correct_answer": "B"},
    {"id": 41, "difficulty": "hard", "question": "📊 Draw a bar graph for: A=40, B=25, C=50, D=30. If scale is 1 cm = 10 units, bar for C is? ", "options": {"A": "2.5 cm", "B": "4 cm", "C": "5 cm", "D": "5.5 cm"}, "correct_answer": "C"},
    {"id": 42, "difficulty": "hard", "question": "🥧 For a pie chart, data: A=30%, B=25%, C=45%. What are the angles? ", "options": {"A": "A=108°, B=90°, C=162°", "B": "A=90°, B=108°, C=162°", "C": "A=30°, B=25°, C=45°", "D": "A=100°, B=80°, C=180°"}, "correct_answer": "A"},
    {"id": 43, "difficulty": "hard", "question": "📈 In a histogram with classes 0-10 (freq 5), 10-20 (freq 12), what is the height of the second bar if width is 1 unit? ", "options": {"A": "5", "B": "10", "C": "12", "D": "Cannot determine"}, "correct_answer": "C"},
    {"id": 44, "difficulty": "hard", "question": "🎯 For a frequency polygon, points are plotted at (class mark, frequency) and joined by lines. True or False? ", "options": {"A": "True", "B": "False, plot at upper limits", "C": "False, plot at lower limits", "D": "False, bars are used"}, "correct_answer": "A"},
    {"id": 45, "difficulty": "hard", "question": "📊 If a double bar graph shows Boys and Girls in 3 classes, how many bars total? ", "options": {"A": "3", "B": "6", "C": "2", "D": "9"}, "correct_answer": "B"},
    {"id": 46, "difficulty": "hard", "question": "🥧 In a pie chart, if a sector's angle is 120°, and total frequency is 180, what is its frequency? ", "options": {"A": "30", "B": "60", "C": "90", "D": "120"}, "correct_answer": "B"},
    {"id": 47, "difficulty": "hard", "question": "📈 To draw a histogram for unequal class intervals, we adjust... ", "options": {"A": "The frequency", "B": "The height (frequency density)", "C": "The class mark", "D": "The scale on x-axis only"}, "correct_answer": "B"},
    {"id": 48, "difficulty": "hard", "question": "🔢 In a line graph, if points are (1,10), (2,15), (3,12), what is the increase from 1 to 2? ", "options": {"A": "5 units", "B": "10 units", "C": "15 units", "D": "2 units"}, "correct_answer": "A"},
    {"id": 49, "difficulty": "hard", "question": "🎨 A pictograph uses a 🚗 symbol for 50 cars. How to represent 125 cars? ", "options": {"A": "🚗🚗", "B": "🚗🚗🚗", "C": "🚗🚗 and a half 🚗", "D": "🚗🚗🚗🚗"}, "correct_answer": "C"},
    {"id": 50, "difficulty": "hard", "question": "📊 For classes 10-20, 20-30, 30-40 with freqs 8, 15, 7, what is plotted on x-axis for frequency polygon? ", "options": {"A": "10,20,30,40", "B": "15,25,35", "C": "8,15,7", "D": "20,30,40"}, "correct_answer": "B"},
    {"id": 51, "difficulty": "hard", "question": "🥧 The angle for a sector is 54°. If total is 200, the frequency is? ", "options": {"A": "27", "B": "30", "C": "54", "D": "108"}, "correct_answer": "B"},
    {"id": 52, "difficulty": "hard", "question": "📈 A cumulative frequency graph is called... ", "options": {"A": "Ogive", "B": "Histogram", "C": "Frequency Polygon", "D": "Pie Chart"}, "correct_answer": "A"},
    {"id": 53, "difficulty": "hard", "question": "📊 In a histogram, if class intervals are 0-5, 5-15, 15-20 with freqs 4, 18, 10, what is the adjusted freq for 5-15? ", "options": {"A": "9", "B": "18", "C": "1.8", "D": "3.6"}, "correct_answer": "A"},
    {"id": 54, "difficulty": "hard", "question": "🎯 For a frequency polygon, we join points with straight lines and the graph is closed by connecting to... ", "options": {"A": "The origin", "B": "The x-axis at class marks before first and after last", "C": "The y-axis", "D": "The title"}, "correct_answer": "B"},
    {"id": 55, "difficulty": "hard", "question": "🔢 If a bar graph's y-axis starts at 10 (not 0), it can be... ", "options": {"A": "More accurate", "B": "Misleading", "C": "Required for all graphs", "D": "Easier to draw"}, "correct_answer": "B"},
    {"id": 56, "difficulty": "hard", "question": "📈 Which graph is best to show the trend of population growth over 100 years? ", "options": {"A": "Pie Chart", "B": "Bar Graph", "C": "Line Graph", "D": "Pictograph"}, "correct_answer": "C"},
    {"id": 57, "difficulty": "hard", "question": "🥧 In a pie chart, if two sectors have angles 90° and 60°, what is the ratio of their frequencies? ", "options": {"A": "3:2", "B": "2:3", "C": "9:6", "D": "90:60"}, "correct_answer": "A"},
    {"id": 58, "difficulty": "hard", "question": "📊 A histogram for equal class intervals: the area is proportional to frequency because width is constant. (True/False) ", "options": {"A": "True", "B": "False", "C": "Only for unequal", "D": "Never true"}, "correct_answer": "A"},
    {"id": 59, "difficulty": "hard", "question": "🎨 What is a component bar graph also known as? ", "options": {"A": "Sub-divided bar diagram", "B": "Multiple line graph", "C": "Stacked bar chart", "D": "Both A and C"}, "correct_answer": "D"},
    {"id": 60, "difficulty": "hard", "question": "✅ A graph that shows the running total of frequencies is... ", "options": {"A": "Frequency Polygon", "B": "Ogive", "C": "Histogram", "D": "Pie Chart"}, "correct_answer": "B"}
  ]
}