{
  "title": "Double Bar Graphs - Grade 7 CBSE",
  "total_questions": 150,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "In a double bar graph, what do two bars side by side represent?", "options": {"A": "Two different time periods", "B": "Two different categories for comparison", "C": "Two different scales", "D": "Two different graphs"}, "correct_answer": "B"},
    {"id": 2, "difficulty": "easy", "question": "What is the main purpose of a double bar graph?", "options": {"A": "To show trends over time", "B": "To compare two sets of data", "C": "To show percentages", "D": "To show geographical data"}, "correct_answer": "B"},
    {"id": 3, "difficulty": "easy", "question": "In a double bar graph comparing boys and girls test scores, what would two bars for 'Math' show?", "options": {"A": "Math scores for boys and girls", "B": "Math and English scores", "C": "Scores for two different tests", "D": "Scores for two different schools"}, "correct_answer": "A"},
    {"id": 4, "difficulty": "easy", "question": "Which axis typically shows categories in a double bar graph?", "options": {"A": "X-axis", "B": "Y-axis", "C": "Both axes", "D": "Neither axis"}, "correct_answer": "A"},
    {"id": 5, "difficulty": "easy", "question": "What does the height of a bar represent in a double bar graph?", "options": {"A": "The category name", "B": "The value or quantity", "C": "The time period", "D": "The color code"}, "correct_answer": "B"},
    {"id": 6, "difficulty": "easy", "question": "In a double bar graph showing monthly sales for two years, what would be on the X-axis?", "options": {"A": "Sales amounts", "B": "Months", "C": "Years", "D": "Profit percentages"}, "correct_answer": "B"},
    {"id": 7, "difficulty": "easy", "question": "What is used to distinguish between the two sets of bars in a double bar graph?", "options": {"A": "Different colors or patterns", "B": "Different heights", "C": "Different widths", "D": "Different positions"}, "correct_answer": "A"},
    {"id": 8, "difficulty": "easy", "question": "In a double bar graph comparing Class 7A and 7B test scores, what would be the categories?", "options": {"A": "Student names", "B": "Subjects", "C": "Test dates", "D": "Classrooms"}, "correct_answer": "B"},
    {"id": 9, "difficulty": "easy", "question": "What should a double bar graph always include?", "options": {"A": "Title, labels, legend", "B": "Pictures, colors, designs", "C": "Equations, formulas", "D": "Only bars"}, "correct_answer": "A"},
    {"id": 10, "difficulty": "easy", "question": "In a double bar graph, what does the legend explain?", "options": {"A": "What each color represents", "B": "The scale of the graph", "C": "The categories", "D": "The calculations used"}, "correct_answer": "A"},
    {"id": 11, "difficulty": "easy", "question": "If a double bar graph shows TV and internet hours for different age groups, what are the two data sets?", "options": {"A": "TV hours and internet hours", "B": "Different age groups", "C": "Weekdays and weekends", "D": "Morning and evening"}, "correct_answer": "A"},
    {"id": 12, "difficulty": "easy", "question": "What is the scale on the Y-axis of a double bar graph?", "options": {"A": "The range of values being measured", "B": "The list of categories", "C": "The time periods", "D": "The color codes"}, "correct_answer": "A"},
    {"id": 13, "difficulty": "easy", "question": "In a double bar graph comparing two sports teams' scores, what would each pair of bars represent?", "options": {"A": "Different games or matches", "B": "Different players", "C": "Different sports", "D": "Different seasons"}, "correct_answer": "A"},
    {"id": 14, "difficulty": "easy", "question": "Why are bars placed side by side in a double bar graph?", "options": {"A": "For easy comparison", "B": "To save space", "C": "To make it colorful", "D": "To show totals"}, "correct_answer": "A"},
    {"id": 15, "difficulty": "easy", "question": "In a double bar graph showing book sales for two authors, what would be measured on Y-axis?", "options": {"A": "Number of books sold", "B": "Book titles", "C": "Author names", "D": "Months of publication"}, "correct_answer": "A"},
    {"id": 16, "difficulty": "easy", "question": "What type of data is best shown using a double bar graph?", "options": {"A": "Comparing two related sets of data", "B": "Showing continuous change over time", "C": "Showing parts of a whole", "D": "Showing geographical locations"}, "correct_answer": "A"},
    {"id": 17, "difficulty": "easy", "question": "In a double bar graph, if blue bars show boys' scores and red bars show girls' scores, what does this represent?", "options": {"A": "A legend", "B": "A scale", "C": "A title", "D": "A category"}, "correct_answer": "A"},
    {"id": 18, "difficulty": "easy", "question": "What should be the first step in reading a double bar graph?", "options": {"A": "Read the title", "B": "Look at the colors", "C": "Count the bars", "D": "Measure the heights"}, "correct_answer": "A"},
    {"id": 19, "difficulty": "easy", "question": "In a double bar graph comparing rainfall in two cities, what would each pair of bars show?", "options": {"A": "Rainfall for each month", "B": "Names of cities", "C": "Years of data", "D": "Temperature ranges"}, "correct_answer": "A"},
    {"id": 20, "difficulty": "easy", "question": "What makes a double bar graph different from a single bar graph?", "options": {"A": "It shows two data sets for comparison", "B": "It has more colors", "C": "It is taller", "D": "It shows time series"}, "correct_answer": "A"},
    {"id": 21, "difficulty": "medium", "question": "A double bar graph shows: Math - Boys: 80, Girls: 85; Science - Boys: 75, Girls: 90. Which subject has greater difference between genders?", "options": {"A": "Math", "B": "Science", "C": "Both equal", "D": "Cannot determine"}, "correct_answer": "B"},
    {"id": 22, "difficulty": "medium", "question": "In a graph showing Company A and B sales (in thousands): Jan: A=20, B=25; Feb: A=30, B=28; Mar: A=35, B=32. Which month had highest total sales?", "options": {"A": "January", "B": "February", "C": "March", "D": "All equal"}, "correct_answer": "C"},
    {"id": 23, "difficulty": "medium", "question": "A double bar graph shows ice cream sales: Chocolate - June: 150, July: 200; Vanilla - June: 120, July: 180. What percentage increase for Chocolate from June to July?", "options": {"A": "25%", "B": "33.33%", "C": "50%", "D": "75%"}, "correct_answer": "B"},
    {"id": 24, "difficulty": "medium", "question": "Graph shows TV viewing hours: Kids - Weekday: 2, Weekend: 4; Teens - Weekday: 3, Weekend: 5. What is average weekend viewing?", "options": {"A": "3.5 hours", "B": "4 hours", "C": "4.5 hours", "D": "5 hours"}, "correct_answer": "C"},
    {"id": 25, "difficulty": "medium", "question": "A school graph shows sports participation: Basketball - Boys: 40, Girls: 30; Cricket - Boys: 50, Girls: 20. Total participants in both sports?", "options": {"A": "120", "B": "130", "C": "140", "D": "150"}, "correct_answer": "C"},
    {"id": 26, "difficulty": "medium", "question": "Book reading graph: Fiction - Class 7A: 25, 7B: 30; Non-fiction - 7A: 15, 7B: 20. Which class reads more in total?", "options": {"A": "7A", "B": "7B", "C": "Equal", "D": "Cannot tell"}, "correct_answer": "B"},
    {"id": 27, "difficulty": "medium", "question": "Rainfall graph (in mm): City X - Jan: 50, Feb: 60; City Y - Jan: 40, Feb: 70. Difference in February rainfall?", "options": {"A": "5 mm", "B": "10 mm", "C": "15 mm", "D": "20 mm"}, "correct_answer": "B"},
    {"id": 28, "difficulty": "medium", "question": "Test scores graph: English - First term: 75, Second term: 80; Math - First: 70, Second: 85. Which subject improved more?", "options": {"A": "English", "B": "Math", "C": "Both equal", "D": "Neither improved"}, "correct_answer": "B"},
    {"id": 29, "difficulty": "medium", "question": "Pet ownership graph: Dogs - Urban: 150, Rural: 200; Cats - Urban: 100, Rural: 150. Total pets in urban areas?", "options": {"A": "250", "B": "300", "C": "350", "D": "400"}, "correct_answer": "A"},
    {"id": 30, "difficulty": "medium", "question": "Library visits: Children - Morning: 60, Evening: 80; Adults - Morning: 40, Evening: 100. When are visits highest?", "options": {"A": "Morning", "B": "Evening", "C": "Equal", "D": "No visits"}, "correct_answer": "B"},
    {"id": 31, "difficulty": "medium", "question": "Bike sales: Mountain - Q1: 120, Q2: 150; Road - Q1: 100, Q2: 130. Percentage increase for Road bikes?", "options": {"A": "25%", "B": "30%", "C": "35%", "D": "40%"}, "correct_answer": "B"},
    {"id": 32, "difficulty": "medium", "question": "Food preference: Pizza - Boys: 35, Girls: 40; Burger - Boys: 45, Girls: 30. Which food is more popular overall?", "options": {"A": "Pizza", "B": "Burger", "C": "Equal", "D": "Cannot determine"}, "correct_answer": "B"},
    {"id": 33, "difficulty": "medium", "question": "Movie attendance: Action - Day 1: 200, Day 2: 250; Comedy - Day 1: 180, Day 2: 220. Total attendance Day 2?", "options": {"A": "420", "B": "430", "C": "440", "D": "470"}, "correct_answer": "D"},
    {"id": 34, "difficulty": "medium", "question": "Study hours: Week 1 - Science: 10, Math: 12; Week 2 - Science: 15, Math: 18. Increase in Science hours?", "options": {"A": "3 hours", "B": "5 hours", "C": "6 hours", "D": "8 hours"}, "correct_answer": "B"},
    {"id": 35, "difficulty": "medium", "question": "Plant growth (in cm): Rose - Week 1: 5, Week 2: 8; Lily - Week 1: 4, Week 2: 7. Which grew more in percentage?", "options": {"A": "Rose", "B": "Lily", "C": "Both equal", "D": "Cannot calculate"}, "correct_answer": "B"},
    {"id": 36, "difficulty": "medium", "question": "Car sales: Sedan - January: 25, February: 35; SUV - January: 30, February: 40. Total cars sold in February?", "options": {"A": "65", "B": "70", "C": "75", "D": "80"}, "correct_answer": "C"},
    {"id": 37, "difficulty": "medium", "question": "Music preferences: Pop - Teens: 60, Adults: 40; Rock - Teens: 50, Adults: 50. Average preference for Pop?", "options": {"A": "45", "B": "50", "C": "55", "D": "60"}, "correct_answer": "B"},
    {"id": 38, "difficulty": "medium", "question": "Exercise minutes: Yoga - Male: 30, Female: 45; Gym - Male: 60, Female: 40. Total exercise time for females?", "options": {"A": "70 minutes", "B": "75 minutes", "C": "85 minutes", "D": "90 minutes"}, "correct_answer": "C"},
    {"id": 39, "difficulty": "medium", "question": "Book genres: Mystery - Library A: 120, B: 150; Romance - A: 100, B: 130. Difference between libraries for Mystery?", "options": {"A": "20", "B": "30", "C": "40", "D": "50"}, "correct_answer": "B"},
    {"id": 40, "difficulty": "medium", "question": "Temperature (°C): Delhi - Summer: 40, Winter: 20; Mumbai - Summer: 35, Winter: 25. Which city has greater seasonal variation?", "options": {"A": "Delhi", "B": "Mumbai", "C": "Equal", "D": "Cannot tell"}, "correct_answer": "A"},
    {"id": 41, "difficulty": "medium", "question": "Smartphone users: Android - 2020: 150, 2021: 180; iOS - 2020: 100, 2021: 130. Total users in 2021?", "options": {"A": "280", "B": "300", "C": "310", "D": "330"}, "correct_answer": "C"},
    {"id": 42, "difficulty": "medium", "question": "Fruit sales (kg): Apples - Market 1: 200, Market 2: 250; Oranges - Market 1: 150, Market 2: 200. Total sales Market 1?", "options": {"A": "300", "B": "350", "C": "400", "D": "450"}, "correct_answer": "B"},
    {"id": 43, "difficulty": "medium", "question": "Homework time: English - Grade 6: 45, Grade 7: 60; Math - Grade 6: 60, Grade 7: 75. Average for Grade 7?", "options": {"A": "62.5 min", "B": "65 min", "C": "67.5 min", "D": "70 min"}, "correct_answer": "C"},
    {"id": 44, "difficulty": "medium", "question": "Website visits: Site A - Mobile: 3000, Desktop: 2000; Site B - Mobile: 2500, Desktop: 1500. Total mobile visits?", "options": {"A": "4500", "B": "5000", "C": "5500", "D": "6000"}, "correct_answer": "C"},
    {"id": 45, "difficulty": "medium", "question": "Sport popularity: Football - Boys: 80, Girls: 40; Basketball - Boys: 60, Girls: 50. Ratio of boys to girls in Football?", "options": {"A": "2:1", "B": "3:2", "C": "4:3", "D": "5:4"}, "correct_answer": "A"},
    {"id": 46, "difficulty": "medium", "question": "Coffee shop: Coffee - Morning: 120, Evening: 80; Tea - Morning: 60, Evening: 100. When is tea more popular?", "options": {"A": "Morning", "B": "Evening", "C": "Equal", "D": "Never"}, "correct_answer": "B"},
    {"id": 47, "difficulty": "medium", "question": "Test averages: Physics - Class X: 75, Class Y: 80; Chemistry - Class X: 70, Class Y: 85. Which class performs better overall?", "options": {"A": "Class X", "B": "Class Y", "C": "Equal", "D": "Cannot compare"}, "correct_answer": "B"},
    {"id": 48, "difficulty": "medium", "question": "Park visitors: Weekday - Children: 150, Adults: 200; Weekend - Children: 300, Adults: 400. Percentage increase children weekend vs weekday?", "options": {"A": "50%", "B": "75%", "C": "100%", "D": "150%"}, "correct_answer": "C"},
    {"id": 49, "difficulty": "medium", "question": "Music downloads: Song A - Country X: 5000, Country Y: 6000; Song B - Country X: 4000, Country Y: 7000. Which song more popular in Country Y?", "options": {"A": "Song A", "B": "Song B", "C": "Equal", "D": "Cannot tell"}, "correct_answer": "B"},
    {"id": 50, "difficulty": "medium", "question": "Energy usage (kWh): AC - Summer: 300, Winter: 100; Heater - Summer: 50, Winter: 250. Total winter usage?", "options": {"A": "300", "B": "350", "C": "400", "D": "450"}, "correct_answer": "B"},
    {"id": 51, "difficulty": "medium", "question": "Reading levels: Level 1 - School A: 40, School B: 50; Level 2 - School A: 30, School B: 40. Total students School B?", "options": {"A": "70", "B": "80", "C": "90", "D": "100"}, "correct_answer": "C"},
    {"id": 52, "difficulty": "medium", "question": "Car colors: White - Model X: 25, Model Y: 35; Black - Model X: 30, Model Y: 40. Which color more popular for Model Y?", "options": {"A": "White", "B": "Black", "C": "Equal", "D": "Cannot tell"}, "correct_answer": "B"},
    {"id": 53, "difficulty": "medium", "question": "Pizza toppings: Cheese - Store 1: 120, Store 2: 150; Pepperoni - Store 1: 100, Store 2: 130. Difference between stores for Pepperoni?", "options": {"A": "20", "B": "30", "C": "40", "D": "50"}, "correct_answer": "B"},
    {"id": 54, "difficulty": "medium", "question": "Study subjects: History - Group 1: 8 hrs, Group 2: 10 hrs; Geography - Group 1: 6 hrs, Group 2: 9 hrs. Total hours Group 2?", "options": {"A": "17", "B": "18", "C": "19", "D": "20"}, "correct_answer": "C"},
    {"id": 55, "difficulty": "medium", "question": "Mobile data: Plan A - Urban: 500, Rural: 300; Plan B - Urban: 400, Rural: 350. Total rural users?", "options": {"A": "600", "B": "650", "C": "700", "D": "750"}, "correct_answer": "B"},
    {"id": 56, "difficulty": "medium", "question": "Bakery items: Bread - Day 1: 80, Day 2: 100; Cake - Day 1: 60, Day 2: 90. Percentage increase for Cake?", "options": {"A": "30%", "B": "40%", "C": "50%", "D": "60%"}, "correct_answer": "C"},
    {"id": 57, "difficulty": "medium", "question": "TV channels: News - Time slot 1: 200, Time slot 2: 250; Sports - Time slot 1: 300, Time slot 2: 350. Total viewers time slot 2?", "options": {"A": "550", "B": "600", "C": "650", "D": "700"}, "correct_answer": "B"},
    {"id": 58, "difficulty": "medium", "question": "Computer types: Laptop - Office: 150, Home: 200; Desktop - Office: 100, Home: 50. Where are laptops more common?", "options": {"A": "Office", "B": "Home", "C": "Equal", "D": "Neither"}, "correct_answer": "B"},
    {"id": 59, "difficulty": "medium", "question": "Movie genres: Action - Theater A: 500, B: 600; Drama - Theater A: 400, B: 500. Total Theater A attendance?", "options": {"A": "800", "B": "900", "C": "1000", "D": "1100"}, "correct_answer": "B"},
    {"id": 60, "difficulty": "medium", "question": "Exercise types: Running - Morning: 40, Evening: 60; Cycling - Morning: 30, Evening: 50. Average evening participants?", "options": {"A": "50", "B": "55", "C": "60", "D": "65"}, "correct_answer": "B"},
    {"id": 61, "difficulty": "medium", "question": "Book categories: Fiction - Library X: 1200, Y: 1500; Non-fiction - Library X: 800, Y: 1000. Percentage more in Library Y for Fiction?", "options": {"A": "20%", "B": "25%", "C": "30%", "D": "35%"}, "correct_answer": "B"},
    {"id": 62, "difficulty": "medium", "question": "Pet types: Dogs - City: 300, Village: 400; Cats - City: 200, Village: 250. Where are pets more total?", "options": {"A": "City", "B": "Village", "C": "Equal", "D": "Cannot tell"}, "correct_answer": "B"},
    {"id": 63, "difficulty": "medium", "question": "Food items: Sandwich - Cafe A: 150, B: 180; Salad - Cafe A: 100, B: 120. Difference for Sandwich between cafes?", "options": {"A": "20", "B": "30", "C": "40", "D": "50"}, "correct_answer": "B"},
    {"id": 64, "difficulty": "medium", "question": "Music instruments: Guitar - School 1: 25, School 2: 35; Piano - School 1: 20, School 2: 30. Total instruments School 2?", "options": {"A": "55", "B": "60", "C": "65", "D": "70"}, "correct_answer": "C"},
    {
    "id": 65,
    "difficulty": "medium",
    "question": "Transport modes: Car - Peak: 500, Off-peak: 300; Bus - Peak: 400, Off-peak: 200. When is car usage highest compared to bus?",
    "options": {
      "A": "Peak",
      "B": "Off-peak",
      "C": "Equal",
      "D": "Never"
    },
    "correct_answer": "B"
  }, {"id": 66, "difficulty": "medium", "question": "Drink sales: Coffee - Summer: 200, Winter: 300; Tea - Summer: 150, Winter: 250. Total winter sales?", "options": {"A": "500", "B": "550", "C": "600", "D": "650"}, "correct_answer": "B"},
    {"id": 67, "difficulty": "medium", "question": "App downloads: Game A - Android: 5000, iOS: 3000; Game B - Android: 4000, iOS: 3500. Which game more popular on iOS?", "options": {"A": "Game A", "B": "Game B", "C": "Equal", "D": "Cannot tell"}, "correct_answer": "B"},
    {"id": 68, "difficulty": "medium", "question": "Class attendance: Math - Mon: 35, Wed: 40; Science - Mon: 30, Wed: 45. Average Wednesday attendance?", "options": {"A": "40", "B": "42.5", "C": "45", "D": "47.5"}, "correct_answer": "B"},
    {"id": 69, "difficulty": "medium", "question": "Shopping: Online - Weekday: 200, Weekend: 300; Store - Weekday: 150, Weekend: 250. Percentage increase online weekend vs weekday?", "options": {"A": "30%", "B": "40%", "C": "50%", "D": "60%"}, "correct_answer": "C"},
    {"id": 70, "difficulty": "medium", "question": "Hobbies: Reading - Teens: 40, Adults: 60; Sports - Teens: 50, Adults: 40. Which hobby preferred by teens?", "options": {"A": "Reading", "B": "Sports", "C": "Equal", "D": "Neither"}, "correct_answer": "B"},
    {"id": 71, "difficulty": "medium", "question": "Water usage (liters): Bath - Summer: 80, Winter: 60; Shower - Summer: 50, Winter: 40. Total summer usage?", "options": {"A": "120", "B": "130", "C": "140", "D": "150"}, "correct_answer": "B"},
    {"id": 72, "difficulty": "medium", "question": "Movie ratings: Film A - Critics: 7, Audience: 8; Film B - Critics: 6, Audience: 9. Which film has bigger gap between critic and audience?", "options": {"A": "Film A", "B": "Film B", "C": "Equal", "D": "Cannot tell"}, "correct_answer": "B"},
    {"id": 73, "difficulty": "medium", "question": "Garden plants: Flowers - Section 1: 120, Section 2: 150; Vegetables - Section 1: 80, Section 2: 100. Total plants Section 1?", "options": {"A": "190", "B": "200", "C": "210", "D": "220"}, "correct_answer": "B"},
    {"id": 74, "difficulty": "medium", "question": "Phone brands: Brand X - Urban: 300, Rural: 200; Brand Y - Urban: 250, Rural: 150. Total urban phones?", "options": {"A": "500", "B": "550", "C": "600", "D": "650"}, "correct_answer": "B"},
    {"id": 75, "difficulty": "medium", "question": "Study locations: Library - Day: 100, Night: 50; Home - Day: 80, Night: 70. When is library more popular?", "options": {"A": "Day", "B": "Night", "C": "Equal", "D": "Never"}, "correct_answer": "A"},
    {"id": 76, "difficulty": "medium", "question": "Fruit consumption: Apples - Children: 200, Adults: 150; Bananas - Children: 150, Adults: 200. Which fruit preferred by children?", "options": {"A": "Apples", "B": "Bananas", "C": "Equal", "D": "Neither"}, "correct_answer": "A"},
    {"id": 77, "difficulty": "medium", "question": "Exercise frequency: Daily - Men: 40, Women: 50; Weekly - Men: 60, Women: 70. Total women exercising?", "options": {"A": "100", "B": "110", "C": "120", "D": "130"}, "correct_answer": "C"},
    {"id": 78, "difficulty": "medium", "question": "Music streaming: Pop - Free: 5000, Paid: 3000; Rock - Free: 4000, Paid: 3500. Which genre has higher paid percentage?", "options": {"A": "Pop", "B": "Rock", "C": "Equal", "D": "Cannot calculate"}, "correct_answer": "B"},
    {"id": 79, "difficulty": "medium", "question": "Travel distance: Work - Car: 15 km, Bus: 20 km; School - Car: 10 km, Bus: 15 km. Average car distance?", "options": {"A": "11.5 km", "B": "12.5 km", "C": "13.5 km", "D": "14.5 km"}, "correct_answer": "B"},
    {"id": 80, "difficulty": "medium", "question": "Social media: Platform A - Teens: 400, Adults: 200; Platform B - Teens: 300, Adults: 250. Which platform more teen-oriented?", "options": {"A": "Platform A", "B": "Platform B", "C": "Equal", "D": "Neither"}, "correct_answer": "A"},
    {
    "id": 81,
    "difficulty": "hard",
    "question": "A double bar graph shows sales: Product X - Q1: 120, Q2: 150, Q3: 180, Q4: 200; Product Y - Q1: 100, Q2: 130, Q3: 170, Q4: 190. In which quarter did Product X outsell Product Y by the greatest margin?",
    "options": {
      "A": "Q1",
      "B": "Q2",
      "C": "Q3",
      "D": "Q1 and Q2 (tie)"
    },
    "correct_answer": "D"
  }, {"id": 82, "difficulty": "hard", "question": "Graph shows test scores out of 100: Class A - Test 1: 75, Test 2: 85, Test 3: 80; Class B - Test 1: 70, Test 2: 80, Test 3: 90. Which class showed consistent improvement?", "options": {"A": "Class A", "B": "Class B", "C": "Both", "D": "Neither"}, "correct_answer": "B"},
    {"id": 83, "difficulty": "hard", "question": "Temperature range graph: City P - Summer max: 40, min: 25; Winter max: 20, min: 5. City Q - Summer max: 35, min: 20; Winter max: 25, min: 10. Which city has greater annual temperature variation?", "options": {"A": "City P", "B": "City Q", "C": "Equal", "D": "Cannot determine"}, "correct_answer": "A"},
    {"id": 84, "difficulty": "hard", "question": "A company graph shows: Department X - Male: 40, Female: 60; Department Y - Male: 70, Female: 30; Department Z - Male: 50, Female: 50. What percentage of total employees are female?", "options": {"A": "46.67%", "B": "50%", "C": "53.33%", "D": "56.67%"}, "correct_answer": "A"},
    {"id": 85, "difficulty": "hard", "question": "Population growth: Town A - 2010: 5000, 2020: 6000; Town B - 2010: 8000, 2020: 10000. Which town had higher percentage growth?", "options": {"A": "Town A", "B": "Town B", "C": "Equal", "D": "Cannot calculate"}, "correct_answer": "A"},
    {"id": 86, "difficulty": "hard", "question": "A double bar graph shows reading habits: Fiction - Teens: 5 hrs, Adults: 8 hrs; Non-fiction - Teens: 3 hrs, Adults: 6 hrs; News - Teens: 2 hrs, Adults: 4 hrs. What percentage of teen reading time is fiction?", "options": {"A": "40%", "B": "45%", "C": "50%", "D": "55%"}, "correct_answer": "C"},
    {"id": 87, "difficulty": "hard", "question": "Sports participation graph: Football - Boys: 40, Girls: 20; Cricket - Boys: 35, Girls: 15; Basketball - Boys: 30, Girls: 25. What is the ratio of total boys to girls across all sports?", "options": {"A": "2:1", "B": "7:4", "C": "3:2", "D": "4:3"}, "correct_answer": "B"},
    {"id": 88, "difficulty": "hard", "question": "A graph shows electricity consumption: House A - Summer: 500 units, Winter: 300 units; House B - Summer: 400 units, Winter: 350 units. Which house shows greater seasonal variation and by what percentage?", "options": {"A": "House A, 40%", "B": "House A, 50%", "C": "House B, 12.5%", "D": "House B, 14.3%"}, "correct_answer": "A"},
    {
    "id": 89,
    "difficulty": "hard",
    "question": "Book sales over 3 months: Novel - Jan: 120, Feb: 150, Mar: 180; Textbook - Jan: 100, Feb: 130, Mar: 160. In which month was the difference between novel and textbook sales exactly 20?",
    "options": {
      "A": "January",
      "B": "February",
      "C": "March",
      "D": "All months"
    },
    "correct_answer": "D"
  }, {
    "id": 90,
    "difficulty": "hard",
    "question": "A school graph shows: Class 7A - Math: 80, Science: 75, English: 85; Class 7B - Math: 85, Science: 80, English: 80. What is the average difference between classes across subjects?",
    "options": {
      "A": "3",
      "B": "4",
      "C": "5",
      "D": "6"
    },
    "correct_answer": "C"
  }, {"id": 91, "difficulty": "hard", "question": "Rainfall over 4 seasons: Region X - Spring: 150, Summer: 200, Autumn: 180, Winter: 100; Region Y - Spring: 120, Summer: 180, Autumn: 160, Winter: 120. Which region has more consistent rainfall (least range)?", "options": {"A": "Region X", "B": "Region Y", "C": "Equal", "D": "Cannot determine"}, "correct_answer": "B"},
      {
    "id": 92,
    "difficulty": "hard",
    "question": "A double bar graph shows: Store A - Week 1: 200 customers, Week 2: 250; Store B - Week 1: 180 customers, Week 2: 240. What is the combined percentage increase from Week 1 to Week 2?",
    "options": {
      "A": "25%",
      "B": "28%",
      "C": "28.95%",
      "D": "30%"
    },
    "correct_answer": "C"
  },
  {"id": 93, "difficulty": "hard", "question": "Mobile data usage: Plan X - Day: 500 MB, Night: 800 MB; Plan Y - Day: 600 MB, Night: 700 MB. What percentage of total usage for Plan X occurs at night?", "options": {"A": "61.5%", "B": "62.5%", "C": "63.5%", "D": "64.5%"}, "correct_answer": "A"},
    {"id": 94, "difficulty": "hard", "question": "Test scores out of 50: Student Group 1 - Test 1: 35, Test 2: 40, Test 3: 45; Student Group 2 - Test 1: 30, Test 2: 38, Test 3: 44. Which group showed greater overall improvement from Test 1 to Test 3?", "options": {"A": "Group 1", "B": "Group 2", "C": "Equal", "D": "Cannot tell"}, "correct_answer": "B"},
     {
    "id": 95,
    "difficulty": "hard",
    "question": "A factory graph shows: Machine A - Shift 1: 500 units, Shift 2: 600, Shift 3: 550; Machine B - Shift 1: 450, Shift 2: 550, Shift 3: 500. During which shift is Machine A's production exactly 50 units more than Machine B?",
    "options": {
      "A": "Shift 1",
      "B": "Shift 2",
      "C": "Shift 3",
      "D": "All shifts"
    },
    "correct_answer": "D"
  }, {"id": 96, "difficulty": "hard", "question": "Library visits: Children - Mon: 40, Wed: 50, Fri: 60; Adults - Mon: 30, Wed: 40, Fri: 50. On which day is the ratio of children to adults 6:5?", "options": {"A": "Monday", "B": "Wednesday", "C": "Friday", "D": "None"}, "correct_answer": "C"},
    {"id": 97, "difficulty": "hard", "question": "A graph shows energy sources: Solar - House 1: 30%, House 2: 40%; Wind - House 1: 20%, House 2: 30%; Grid - House 1: 50%, House 2: 30%. Which house uses more renewable energy overall?", "options": {"A": "House 1", "B": "House 2", "C": "Equal", "D": "Cannot compare percentages"}, "correct_answer": "B"},
    {"id": 98, "difficulty": "hard", "question": "Website traffic: Site A - Mobile: 60%, Desktop: 40%; Site B - Mobile: 45%, Desktop: 55%. If Site A has 10,000 visitors and Site B has 8,000 visitors, how many total mobile visitors?", "options": {"A": "8,400", "B": "8,800", "C": "9,200", "D": "9,600"}, "correct_answer": "D"},
    {
    "id": 99,
    "difficulty": "hard",
    "question": "A double bar graph shows: Product P - Q1: ₹120, Q2: ₹150; Product Q - Q1: ₹100, Q2: ₹140. What is the percentage increase in total revenue from Q1 to Q2?",
    "options": {
      "A": "28%",
      "B": "30%",
      "C": "31.82%",
      "D": "35%"
    },
    "correct_answer": "C"
  },  {"id": 100, "difficulty": "hard", "question": "Test performance: School X - Math: 75%, Science: 80%, English: 85%; School Y - Math: 80%, Science: 75%, English: 90%. If each subject is equally weighted, which school has higher average and by how much?", "options": {"A": "School X by 0.67%", "B": "School Y by 0.67%", "C": "School X by 1.33%", "D": "School Y by 1.33%"}, "correct_answer": "B"}
  ,
{"id":101,"difficulty":"easy","question":"A double bar graph is mainly used to compare:","options":{"A":"One category","B":"Two related data sets","C":"Three variables","D":"Continuous data"},"correct_answer":"B"},
    {"id":102,"difficulty":"easy","question":"In a double bar graph, each category has:","options":{"A":"One bar","B":"Two bars","C":"Three bars","D":"Multiple bars"},"correct_answer":"B"},
    {"id":103,"difficulty":"easy","question":"Which feature helps identify the two bars in a double bar graph?","options":{"A":"Scale","B":"Legend","C":"Title","D":"Axis"},"correct_answer":"B"},
    {"id":104,"difficulty":"easy","question":"If a double bar graph compares boys and girls, what does each color show?","options":{"A":"Subjects","B":"Classes","C":"Gender","D":"Scores"},"correct_answer":"C"},
    {"id":105,"difficulty":"easy","question":"Which axis usually shows categories in a vertical double bar graph?","options":{"A":"X-axis","B":"Y-axis","C":"Both","D":"None"},"correct_answer":"A"},
    {"id":106,"difficulty":"easy","question":"The height of each bar in a double bar graph represents:","options":{"A":"Category","B":"Value","C":"Time","D":"Color"},"correct_answer":"B"},
    {"id":107,"difficulty":"easy","question":"Double bar graphs are best for comparing data across:","options":{"A":"Time only","B":"Two groups","C":"Many variables","D":"Percentages"},"correct_answer":"B"},
    {"id":108,"difficulty":"easy","question":"Which of these is required in a double bar graph?","options":{"A":"Legend","B":"Pictures","C":"Equations","D":"Grid lines"},"correct_answer":"A"},
    {"id":109,"difficulty":"easy","question":"If two bars are of equal height, it means:","options":{"A":"Categories are same","B":"Values are equal","C":"Scales are different","D":"Graph is incorrect"},"correct_answer":"B"},
    {"id":110,"difficulty":"easy","question":"A double bar graph can compare data for:","options":{"A":"Two years","B":"Two classes","C":"Two cities","D":"All of these"},"correct_answer":"D"},
    {"id":111,"difficulty":"easy","question":"Which color difference helps in reading a double bar graph?","options":{"A":"Same colors","B":"Different shades","C":"Different patterns or colors","D":"Random colors"},"correct_answer":"C"},
    {"id":112,"difficulty":"easy","question":"In a double bar graph, bars for one category are placed:","options":{"A":"Far apart","B":"Side by side","C":"Overlapping","D":"Randomly"},"correct_answer":"B"},
    {"id":113,"difficulty":"easy","question":"What should be read first while interpreting a double bar graph?","options":{"A":"Legend","B":"Scale","C":"Title","D":"Bars"},"correct_answer":"C"},
    {"id":114,"difficulty":"easy","question":"Which graph compares two data sets clearly?","options":{"A":"Histogram","B":"Single bar graph","C":"Double bar graph","D":"Pie chart"},"correct_answer":"C"},
    {"id":115,"difficulty":"easy","question":"If the scale is wrong in a double bar graph, the graph becomes:","options":{"A":"Accurate","B":"Misleading","C":"Clear","D":"Better"},"correct_answer":"B"},
    {"id":116,"difficulty":"easy","question":"Double bar graphs show comparison mainly through:","options":{"A":"Colors","B":"Bar heights","C":"Bar widths","D":"Shading"},"correct_answer":"B"},
    {"id":117,"difficulty":"easy","question":"What does the legend of a double bar graph explain?","options":{"A":"Scale values","B":"Category names","C":"Bar meanings","D":"Axis labels"},"correct_answer":"C"},
    {"id":118,"difficulty":"easy","question":"If bars are too close in a double bar graph, it affects:","options":{"A":"Scale","B":"Clarity","C":"Values","D":"Accuracy"},"correct_answer":"B"},
    {"id":119,"difficulty":"easy","question":"Which data is unsuitable for a double bar graph?","options":{"A":"Comparing boys and girls","B":"Comparing two years","C":"Comparing two cities","D":"Showing continuous change"},"correct_answer":"D"},
    {"id":120,"difficulty":"easy","question":"Double bar graphs help in finding:","options":{"A":"Exact trends","B":"Differences and similarities","C":"Equations","D":"Predictions"},"correct_answer":"B"},

   
    {"id":121,"difficulty":"medium","question":"A double bar graph shows sales: Shop A=120, Shop B=150. What is the difference?","options":{"A":"20","B":"25","C":"30","D":"35"},"correct_answer":"C"},
    {"id":122,"difficulty":"medium","question":"Math scores: Class X=70, Class Y=85. By what percentage is Class Y higher than Class X?","options":{"A":"15%","B":"18%","C":"21.4%","D":"25%"},"correct_answer":"C"},
    {"id":123,"difficulty":"medium","question":"A double bar graph shows rainfall: City A=80 mm, City B=100 mm. What is the ratio A:B?","options":{"A":"4:5","B":"5:4","C":"8:10","D":"Both A and C"},"correct_answer":"D"},
    {"id":124,"difficulty":"medium","question":"Two bars show values 60 and 90. What is their average?","options":{"A":"70","B":"75","C":"80","D":"85"},"correct_answer":"B"},
    {"id":125,"difficulty":"medium","question":"If one bar is twice the height of another, the values are in ratio:","options":{"A":"1:2","B":"2:1","C":"3:2","D":"2:3"},"correct_answer":"B"},
    {"id":126,"difficulty":"medium","question":"A double bar graph compares attendance: Boys=40, Girls=60. What percent are girls?","options":{"A":"40%","B":"50%","C":"60%","D":"75%"},"correct_answer":"C"},
    {"id":127,"difficulty":"medium","question":"Sales graph: Year 1=200, Year 2=260. What is the increase?","options":{"A":"50","B":"60","C":"70","D":"80"},"correct_answer":"B"},
    {"id":128,"difficulty":"medium","question":"If two bars show 30 and 45 units, what is the difference as a fraction of the larger value?","options":{"A":"1/2","B":"1/3","C":"2/3","D":"3/4"},"correct_answer":"B"},
    {"id":129,"difficulty":"medium","question":"A double bar graph is most useful when data sets are:","options":{"A":"Unrelated","B":"Closely related","C":"Very large","D":"Continuous"},"correct_answer":"B"},
    {"id":130,"difficulty":"medium","question":"If total of two bars is 150 and one bar is 70, the other is:","options":{"A":"70","B":"75","C":"80","D":"85"},"correct_answer":"C"},

    {"id":131,"difficulty":"hard","question":"A double bar graph shows profits: Company A=₹240, Company B=₹300. What is the percentage difference relative to Company A?","options":{"A":"20%","B":"25%","C":"30%","D":"35%"},"correct_answer":"B"},
    {"id":132,"difficulty":"hard","question":"If bars show values in ratio 3:5 and total is 160, what are the two values?","options":{"A":"60 and 100","B":"50 and 110","C":"70 and 90","D":"80 and 80"},"correct_answer":"A"},
    {"id":133,"difficulty":"hard","question":"Two bars differ by 40 units and their average is 120. What are the values?","options":{"A":"100 and 140","B":"90 and 150","C":"80 and 160","D":"110 and 130"},"correct_answer":"A"},
     {
    "id": 134,
    "difficulty": "hard",
    "question": "A double bar graph shows population growth: Town A=5000 to 6000, Town B=8000 to 9200. Which has higher growth rate?",
    "options": {
      "A": "Town A",
      "B": "Town B",
      "C": "Equal",
      "D": "Cannot determine"
    },
    "correct_answer": "A"
  }, {"id":135,"difficulty":"hard","question":"If bar heights are reduced by half due to scale change, the data values are:","options":{"A":"Halved","B":"Doubled","C":"Unchanged","D":"Incorrect"},"correct_answer":"C"},
    {"id":136,"difficulty":"hard","question":"A double bar graph compares two classes: Class A total=240, Class B total=300. What is Class B’s percentage more than Class A?","options":{"A":"20%","B":"25%","C":"30%","D":"35%"},"correct_answer":"B"},
    {"id":137,"difficulty":"hard","question":"Which error most affects interpretation of a double bar graph?","options":{"A":"Color choice","B":"Wrong legend","C":"Wrong scale","D":"Bar width"},"correct_answer":"C"},
    {"id":138,"difficulty":"hard","question":"If two bars represent 45% and 55% of a total 400, find their values.","options":{"A":"160 and 240","B":"170 and 230","C":"180 and 220","D":"200 and 200"},"correct_answer":"C"},
    {"id":139,"difficulty":"hard","question":"A double bar graph shows test scores of two terms. Which conclusion is valid if both bars rise equally?","options":{"A":"No improvement","B":"Same improvement","C":"Different improvement","D":"Decline"},"correct_answer":"B"},
    {"id":140,"difficulty":"hard","question":"If bars are very close in height, the best conclusion is:","options":{"A":"Exact equality","B":"Large difference","C":"Small difference","D":"No relation"},"correct_answer":"C"},
    {"id":141,"difficulty":"hard","question":"Which comparison is NOT suitable for a double bar graph?","options":{"A":"Boys vs girls","B":"This year vs last year","C":"Temperature change over hours","D":"Two schools"},"correct_answer":"C"},
    {"id":142,"difficulty":"hard","question":"If two bars show 80 and 120 units, what is the percentage of the smaller to the larger?","options":{"A":"50%","B":"60%","C":"66.7%","D":"75%"},"correct_answer":"C"},
    {"id":143,"difficulty":"hard","question":"A double bar graph shows expenses: Food=40%, Travel=25%, Others=35% for two families. What must be equal to compare fairly?","options":{"A":"Colors","B":"Categories","C":"Total income","D":"Legend"},"correct_answer":"C"},
    {"id":144,"difficulty":"hard","question":"If scale starts at 20 instead of 0, the graph may:","options":{"A":"Improve clarity","B":"Be misleading","C":"Show exact data","D":"Change values"},"correct_answer":"B"},
    {"id":145,"difficulty":"hard","question":"Two bars show values 72 and 96. Find the ratio in simplest form.","options":{"A":"2:3","B":"3:4","C":"4:5","D":"6:8"},"correct_answer":"B"},
    {
    "id": 146,
    "difficulty": "hard",
    "question": "If total of two bars is 500 and one is 20% more than the other, find the larger value.",
    "options": {
      "A": "250",
      "B": "272.7",
      "C": "300",
      "D": "330"
    },
    "correct_answer": "B"
  }, {"id":147,"difficulty":"hard","question":"Which check ensures correctness of a double bar graph?","options":{"A":"Attractive colors","B":"Rechecking data values","C":"Equal bar width","D":"Neat drawing"},"correct_answer":"B"},
    {"id":148,"difficulty":"hard","question":"If two bars show monthly data, what must be same to compare fairly?","options":{"A":"Color","B":"Scale","C":"Title","D":"Order"},"correct_answer":"B"},
    {"id":149,"difficulty":"hard","question":"Which interpretation is valid from a double bar graph?","options":{"A":"Exact prediction","B":"Cause and effect","C":"Comparison of quantities","D":"Statistical inference"},"correct_answer":"C"},
    {"id":150,"difficulty":"hard","question":"Double bar graphs mainly help students understand:","options":{"A":"Trends","B":"Relationships","C":"Comparisons","D":"Calculations"},"correct_answer":"C"}
]
}