{
  "title": "Organisation of Data (Data Handling) - Grade 8 CBSE",
  "total_questions": 100,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "What is the first step in data handling?", "options": {"A": "Drawing graphs", "B": "Collecting data", "C": "Finding mean", "D": "Making conclusions"}, "correct_answer": "B"},
    {"id": 2, "difficulty": "easy", "question": "Raw data is data which is:", "options": {"A": "Organized in tables", "B": "Ungrouped and unprocessed", "C": "Already analyzed", "D": "Used for graphs"}, "correct_answer": "B"},
    {"id": 3, "difficulty": "easy", "question": "Which of these is a method of data collection?", "options": {"A": "Survey", "B": "Bar graph", "C": "Mean", "D": "Range"}, "correct_answer": "A"},
    {"id": 4, "difficulty": "easy", "question": "Organizing data means:", "options": {"A": "Ignoring some data", "B": "Arranging data in a meaningful order", "C": "Only collecting data", "D": "Destroying unwanted data"}, "correct_answer": "B"},
    {"id": 5, "difficulty": "easy", "question": "What is an array in data organization?", "options": {"A": "A type of graph", "B": "Data arranged in ascending or descending order", "C": "A data collection method", "D": "A measure of central tendency"}, "correct_answer": "B"},
    {"id": 6, "difficulty": "easy", "question": "Why do we organize data?", "options": {"A": "To make it look neat", "B": "To make it easier to analyze and interpret", "C": "To reduce its size", "D": "To change its values"}, "correct_answer": "B"},
    {"id": 7, "difficulty": "easy", "question": "Which tool is used to organize small sets of data?", "options": {"A": "Frequency distribution table", "B": "Pie chart", "C": "Histogram", "D": "Ogive"}, "correct_answer": "A"},
    {"id": 8, "difficulty": "easy", "question": "Data collected for a specific purpose is called:", "options": {"A": "Random data", "B": "Primary data", "C": "Secondary data", "D": "Graphical data"}, "correct_answer": "B"},
    {"id": 9, "difficulty": "easy", "question": "Data collected from existing sources like books is called:", "options": {"A": "Primary data", "B": "Secondary data", "C": "Raw data", "D": "Arrayed data"}, "correct_answer": "B"},
    {"id": 10, "difficulty": "easy", "question": "A frequency table organizes data by showing:", "options": {"A": "The sum of data", "B": "Values and how often they occur", "C": "The average value", "D": "The range"}, "correct_answer": "B"},
    {"id": 11, "difficulty": "easy", "question": "What is the range of data: 12, 5, 8, 20, 15?", "options": {"A": "5", "B": "12", "C": "15", "D": "20"}, "correct_answer": "C"},
    {"id": 12, "difficulty": "easy", "question": "When data is arranged in ascending order, the middle value is called:", "options": {"A": "Mean", "B": "Median", "C": "Mode", "D": "Range"}, "correct_answer": "B"},
    {"id": 13, "difficulty": "easy", "question": "The most frequently occurring value in a data set is called:", "options": {"A": "Mean", "B": "Median", "C": "Mode", "D": "Range"}, "correct_answer": "C"},
    {"id": 14, "difficulty": "easy", "question": "What is the mean of 4, 6, 8?", "options": {"A": "4", "B": "6", "C": "8", "D": "18"}, "correct_answer": "B"},
    {"id": 15, "difficulty": "easy", "question": "If data has a wide range, it means:", "options": {"A": "Values are very close", "B": "Values are spread out", "C": "Mean is high", "D": "Mode is undefined"}, "correct_answer": "B"},
    {"id": 16, "difficulty": "easy", "question": "Grouped data is used when:", "options": {"A": "There are very few observations", "B": "Data values are repeated", "C": "Data has a large number of observations", "D": "Data is already sorted"}, "correct_answer": "C"},
    {"id": 17, "difficulty": "easy", "question": "The difference between the highest and lowest values is the:", "options": {"A": "Mean", "B": "Median", "C": "Mode", "D": "Range"}, "correct_answer": "D"},
    {"id": 18, "difficulty": "easy", "question": "Which is NOT a measure of central tendency?", "options": {"A": "Mean", "B": "Median", "C": "Mode", "D": "Range"}, "correct_answer": "D"},
    {"id": 19, "difficulty": "easy", "question": "Data can be organized using:", "options": {"A": "Tables", "B": "Graphs", "C": "Both tables and graphs", "D": "Only calculations"}, "correct_answer": "C"},
    {"id": 20, "difficulty": "easy", "question": "If all values in a data set are the same, the range is:", "options": {"A": "0", "B": "1", "C": "Equal to the value", "D": "Undefined"}, "correct_answer": "A"},

    {"id": 21, "difficulty": "medium", "question": "Arrange in ascending order: 23, 12, 45, 9, 34. What is the middle value?", "options": {"A": "12", "B": "23", "C": "34", "D": "45"}, "correct_answer": "B"},
    {"id": 22, "difficulty": "medium", "question": "For data: 5, 7, 5, 8, 9, 5, 7, what is the mode?", "options": {"A": "5", "B": "7", "C": "8", "D": "9"}, "correct_answer": "A"},
    {"id": 23, "difficulty": "medium", "question": "The mean of 10 numbers is 8. If one number is changed from 12 to 2, what is the new mean?", "options": {"A": "7", "B": "7.5", "C": "8", "D": "8.5"}, "correct_answer": "A"},
    {"id": 24, "difficulty": "medium", "question": "What is the range of first 10 natural numbers?", "options": {"A": "9", "B": "10", "C": "11", "D": "12"}, "correct_answer": "A"},
    {"id": 25, "difficulty": "medium", "question": "The median of data: 3, 1, 7, 6, 4 is:", "options": {"A": "3", "B": "4", "C": "6", "D": "7"}, "correct_answer": "B"},
    {"id": 26, "difficulty": "medium", "question": "If the mode of a data set is 15 and mean is 12, which statement could be true?", "options": {"A": "Data is symmetric", "B": "Data is skewed", "C": "Range is zero", "D": "Median is 15"}, "correct_answer": "B"},
    {"id": 27, "difficulty": "medium", "question": "Which measure of central tendency is affected by extreme values?", "options": {"A": "Mean", "B": "Median", "C": "Mode", "D": "All of these"}, "correct_answer": "A"},
    {"id": 28, "difficulty": "medium", "question": "For a symmetric distribution, mean, median and mode are:", "options": {"A": "All equal", "B": "Mean > Median > Mode", "C": "Mean < Median < Mode", "D": "Unrelated"}, "correct_answer": "A"},
    {"id": 29, "difficulty": "medium", "question": "What is the mean of first 5 prime numbers?", "options": {"A": "5.0", "B": "5.6", "C": "6.0", "D": "6.5"}, "correct_answer": "B"},
    {"id": 30, "difficulty": "medium", "question": "In a data set, if each value is increased by 5, what happens to the mean?", "options": {"A": "Increases by 5", "B": "Decreases by 5", "C": "Remains same", "D": "Doubles"}, "correct_answer": "A"},
    {"id": 31, "difficulty": "medium", "question": "In a data set, if each value is multiplied by 3, what happens to the mean?", "options": {"A": "Multiplied by 3", "B": "Divided by 3", "C": "Increased by 3", "D": "Remains same"}, "correct_answer": "A"},
    {"id": 32, "difficulty": "medium", "question": "What is the median of 8, 3, 9, 2, 5, 7, 4?", "options": {"A": "4", "B": "5", "C": "6", "D": "7"}, "correct_answer": "B"},
    {"id": 33, "difficulty": "medium", "question": "The range of data: 14, 27, 29, 61, 45, 15, 9 is:", "options": {"A": "9", "B": "52", "C": "61", "D": "70"}, "correct_answer": "B"},
    {"id": 34, "difficulty": "medium", "question": "Which is not a step in data organization?", "options": {"A": "Collection", "B": "Classification", "C": "Tabulation", "D": "Prediction"}, "correct_answer": "D"},
    {"id": 35, "difficulty": "medium", "question": "Data classified on the basis of geographical area is called:", "options": {"A": "Chronological classification", "B": "Spatial classification", "C": "Qualitative classification", "D": "Quantitative classification"}, "correct_answer": "B"},
    {"id": 36, "difficulty": "medium", "question": "Data classified on the basis of time is called:", "options": {"A": "Chronological", "B": "Spatial", "C": "Qualitative", "D": "Quantitative"}, "correct_answer": "A"},
    {"id": 37, "difficulty": "medium", "question": "Grouping data into classes helps in:", "options": {"A": "Reducing the data size", "B": "Seeing overall pattern", "C": "Calculating exact values", "D": "Ignoring extremes"}, "correct_answer": "B"},
    {"id": 38, "difficulty": "medium", "question": "The class mark of interval 30-40 is:", "options": {"A": "30", "B": "35", "C": "40", "D": "70"}, "correct_answer": "B"},
    {"id": 39, "difficulty": "medium", "question": "If the class size is 10 and lower limit is 15, the upper limit is:", "options": {"A": "20", "B": "24", "C": "25", "D": "30"}, "correct_answer": "C"},
    {"id": 40, "difficulty": "medium", "question": "The number of classes in a grouped data should preferably be between:", "options": {"A": "2 to 5", "B": "5 to 15", "C": "15 to 30", "D": "30 to 50"}, "correct_answer": "B"},
    {"id": 41, "difficulty": "medium", "question": "For data with values from 1 to 100, which class interval is appropriate?", "options": {"A": "1-10, 11-20, ...", "B": "1-5, 6-10, ...", "C": "1-20, 21-40, ...", "D": "All are appropriate"}, "correct_answer": "A"},
    {"id": 42, "difficulty": "medium", "question": "What is the cumulative frequency?", "options": {"A": "Sum of all frequencies", "B": "Running total of frequencies", "C": "Frequency of last class", "D": "Average frequency"}, "correct_answer": "B"},
    {"id": 43, "difficulty": "medium", "question": "In a frequency distribution, the sum of frequencies is always equal to:", "options": {"A": "Number of classes", "B": "Total observations", "C": "Range", "D": "Mean"}, "correct_answer": "B"},
    {"id": 44, "difficulty": "medium", "question": "Which measure is not affected by extreme values?", "options": {"A": "Mean", "B": "Median", "C": "Both mean and median", "D": "Mode"}, "correct_answer": "B"},
    {"id": 45, "difficulty": "medium", "question": "If the mean of 5 numbers is 20, their sum is:", "options": {"A": "4", "B": "20", "C": "25", "D": "100"}, "correct_answer": "D"},
    {"id": 46, "difficulty": "medium", "question": "For a data set with even number of observations, median is:", "options": {"A": "The middle value", "B": "Average of two middle values", "C": "The most frequent value", "D": "The mean"}, "correct_answer": "B"},
    {"id": 47, "difficulty": "medium", "question": "Which is a qualitative data?", "options": {"A": "Height of students", "B": "Weight of apples", "C": "Colour of cars", "D": "Temperature of cities"}, "correct_answer": "C"},
    {"id": 48, "difficulty": "medium", "question": "Which is a quantitative data?", "options": {"A": "Types of fruits", "B": "Names of students", "C": "Marks in a test", "D": "Gender of people"}, "correct_answer": "C"},
    {"id": 49, "difficulty": "medium", "question": "The class interval 10-20, 20-30, 30-40 has class size:", "options": {"A": "5", "B": "10", "C": "15", "D": "20"}, "correct_answer": "B"},
    {"id": 50, "difficulty": "medium", "question": "If the range of data is 48 and lowest value is 12, highest value is:", "options": {"A": "36", "B": "48", "C": "60", "D": "72"}, "correct_answer": "C"},
    {"id": 51, "difficulty": "medium", "question": "Data: 12, 15, 11, 13, 18, 11, 12. What is the mode?", "options": {"A": "11", "B": "12", "C": "11 and 12", "D": "15"}, "correct_answer": "C"},
    {"id": 52, "difficulty": "medium", "question": "The mean of 6 numbers is 15. If one number is excluded, mean becomes 14. The excluded number is:", "options": {"A": "15", "B": "18", "C": "20", "D": "24"}, "correct_answer": "C"},
    {"id": 53, "difficulty": "medium", "question": "What is the median of first 10 even numbers?", "options": {"A": "9", "B": "10", "C": "11", "D": "12"}, "correct_answer": "C"},
    {"id": 54, "difficulty": "medium", "question": "For a data set, if mean = median = mode, the distribution is:", "options": {"A": "Symmetric", "B": "Skewed right", "C": "Skewed left", "D": "Bimodal"}, "correct_answer": "A"},
    {"id": 55, "difficulty": "medium", "question": "In a negatively skewed distribution:", "options": {"A": "Mean < Median < Mode", "B": "Mean > Median > Mode", "C": "Mean = Median = Mode", "D": "Mode is highest"}, "correct_answer": "A"},
    {"id": 56, "difficulty": "medium", "question": "The modal class in a grouped data is:", "options": {"A": "Class with lowest frequency", "B": "Class with highest frequency", "C": "First class", "D": "Last class"}, "correct_answer": "B"},
    {"id": 57, "difficulty": "medium", "question": "What is the range of the data represented by classes 10-20, 20-30, 30-40?", "options": {"A": "10", "B": "20", "C": "30", "D": "40"}, "correct_answer": "C"},
    {"id": 58, "difficulty": "medium", "question": "If each observation is increased by 2, what happens to the range?", "options": {"A": "Increases by 2", "B": "Decreases by 2", "C": "Remains same", "D": "Doubles"}, "correct_answer": "C"},
    {"id": 59, "difficulty": "medium", "question": "If each observation is multiplied by 3, what happens to the range?", "options": {"A": "Multiplied by 3", "B": "Divided by 3", "C": "Increased by 3", "D": "Remains same"}, "correct_answer": "A"},
    {"id": 60, "difficulty": "medium", "question": "Which graph represents cumulative frequencies?", "options": {"A": "Histogram", "B": "Frequency polygon", "C": "Ogive", "D": "Bar graph"}, "correct_answer": "C"},
    {"id": 61, "difficulty": "medium", "question": "For grouped data, the mean is calculated by:", "options": {"A": "Sum of observations / number of observations", "B": "Sum of (midpoint × frequency) / total frequency", "C": "Highest value - lowest value", "D": "Most frequent value"}, "correct_answer": "B"},
    {"id": 62, "difficulty": "medium", "question": "What is the class mark of interval 25-35?", "options": {"A": "25", "B": "30", "C": "35", "D": "60"}, "correct_answer": "B"},
    {"id": 63, "difficulty": "medium", "question": "If the lower limit of a class is 40 and class size is 15, the upper limit is:", "options": {"A": "50", "B": "54", "C": "55", "D": "60"}, "correct_answer": "C"},
    {"id": 64, "difficulty": "medium", "question": "In a frequency table, the relative frequency of a class is:", "options": {"A": "Frequency / total frequency", "B": "Total frequency / frequency", "C": "Frequency × total frequency", "D": "Frequency - mean"}, "correct_answer": "A"},
    {"id": 65, "difficulty": "medium", "question": "Data can be represented visually using:", "options": {"A": "Tables", "B": "Graphs", "C": "Both", "D": "Neither"}, "correct_answer": "C"},
    {"id": 66, "difficulty": "medium", "question": "The difference between class limits and class boundaries is:", "options": {"A": "Class boundaries are halfway points", "B": "Class limits are exact values", "C": "Class boundaries eliminate gaps", "D": "All of these"}, "correct_answer": "D"},
    {"id": 67, "difficulty": "medium", "question": "For a data set with outliers, which measure is most representative?", "options": {"A": "Mean", "B": "Median", "C": "Mode", "D": "Range"}, "correct_answer": "B"},
    {"id": 68, "difficulty": "medium", "question": "What is the median of 21, 23, 25, 27, 29, 31?", "options": {"A": "25", "B": "26", "C": "27", "D": "28"}, "correct_answer": "B"},
    {"id": 69, "difficulty": "medium", "question": "If mode = 25 and mean = 30, the median is likely to be:", "options": {"A": "25", "B": "Between 25 and 30", "C": "30", "D": "Greater than 30"}, "correct_answer": "B"},
    {"id": 70, "difficulty": "medium", "question": "What is the mean of first 5 composite numbers?", "options": {"A": "5.8", "B": "6.8", "C": "7.2", "D": "8.4"}, "correct_answer": "C"},
    {"id": 71, "difficulty": "medium", "question": "Which is NOT true about organizing data?", "options": {"A": "It simplifies complex data", "B": "It helps in data analysis", "C": "It changes the original data values", "D": "It enables drawing graphs"}, "correct_answer": "C"},
    {"id": 72, "difficulty": "medium", "question": "When data is grouped, we lose:", "options": {"A": "The overall pattern", "B": "Exact individual values", "C": "The range", "D": "The number of observations"}, "correct_answer": "B"},
    {"id": 73, "difficulty": "medium", "question": "Which classification is based on attributes?", "options": {"A": "Qualitative", "B": "Quantitative", "C": "Chronological", "D": "Spatial"}, "correct_answer": "A"},
    {"id": 74, "difficulty": "medium", "question": "The class interval 0-10, 10-20, etc. is called:", "options": {"A": "Inclusive", "B": "Exclusive", "C": "Continuous", "D": "Discrete"}, "correct_answer": "B"},
    {"id": 75, "difficulty": "medium", "question": "What is the mode of: 4, 5, 6, 4, 3, 2, 4, 5, 6, 5, 4?", "options": {"A": "3", "B": "4", "C": "5", "D": "6"}, "correct_answer": "B"},
    {"id": 76, "difficulty": "medium", "question": "The mean of 7 numbers is 9. If 3 is added to each number, new mean is:", "options": {"A": "9", "B": "10", "C": "12", "D": "15"}, "correct_answer": "C"},
    {"id": 77, "difficulty": "medium", "question": "If the median of 3, 6, 7, x, 14 is 7, then x could be:", "options": {"A": "5", "B": "7", "C": "8", "D": "10"}, "correct_answer": "C"},
    {"id": 78, "difficulty": "medium", "question": "Which is most stable measure of central tendency?", "options": {"A": "Mean", "B": "Median", "C": "Mode", "D": "All are equally stable"}, "correct_answer": "A"},
    {"id": 79, "difficulty": "medium", "question": "If sum of deviations from mean is zero, it means:", "options": {"A": "All values are zero", "B": "Mean is correctly calculated", "C": "Data is symmetric", "D": "Range is zero"}, "correct_answer": "B"},
    {"id": 80, "difficulty": "medium", "question": "What is the range of data with classes 20-30, 30-40, 40-50?", "options": {"A": "10", "B": "20", "C": "30", "D": "50"}, "correct_answer": "C"},

    {"id": 81, "difficulty": "hard", "question": "The mean of 25 numbers is 18. If 2 is added to each number, what is the new mean?", "options": {"A": "18", "B": "20", "C": "25", "D": "28"}, "correct_answer": "B"},
    {"id": 82, "difficulty": "hard", "question": "The mean of 15 numbers is 25. If each number is multiplied by 4, new mean is:", "options": {"A": "25", "B": "50", "C": "100", "D": "150"}, "correct_answer": "C"},
    {"id": 83, "difficulty": "hard", "question": "The mean of 5 numbers is 10. If one number is excluded, mean becomes 9. The excluded number is:", "options": {"A": "11", "B": "12", "C": "13", "D": "14"}, "correct_answer": "D"},
    {"id": 84, "difficulty": "hard", "question": "For a data set, mean = 22, median = 20, mode = 18. The distribution is:", "options": {"A": "Symmetric", "B": "Positively skewed", "C": "Negatively skewed", "D": "Bimodal"}, "correct_answer": "B"},
    {"id": 85, "difficulty": "hard", "question": "The median of data: 12, 14, 16, x-2, x+2, 28, 30, 32 is 23. Find x.", "options": {"A": "20", "B": "22", "C": "24", "D": "26"}, "correct_answer": "C"},
    {"id": 86, "difficulty": "hard", "question": "The mean of 100 observations is 50. If 20 is subtracted from each observation, new mean is:", "options": {"A": "20", "B": "30", "C": "50", "D": "70"}, "correct_answer": "B"},
    {"id": 87, "difficulty": "hard", "question": "The mode of data: 7, 9, 8, 7, 7, 6, 8, 10, 9, 7 is:", "options": {"A": "6", "B": "7", "C": "8", "D": "9"}, "correct_answer": "B"},
    {"id": 88, "difficulty": "hard", "question": "If the mean of a, b, c is m, then mean of a+3, b+3, c+3 is:", "options": {"A": "m", "B": "m+1", "C": "m+3", "D": "3m"}, "correct_answer": "C"},
    {"id": 89, "difficulty": "hard", "question": "For grouped data with classes 0-10, 10-20, etc., and frequencies 5, 8, 12, 7, 3, what is the total frequency?", "options": {"A": "5", "B": "25", "C": "35", "D": "45"}, "correct_answer": "C"},
    {"id": 90, "difficulty": "hard", "question": "The class marks of distribution are 15, 25, 35, 45. The class size is:", "options": {"A": "5", "B": "10", "C": "15", "D": "20"}, "correct_answer": "B"},
    {"id": 91, "difficulty": "hard", "question": "If the mean of 9 observations is 36 and one observation 54 is replaced by 45, new mean is:", "options": {"A": "33", "B": "35", "C": "36", "D": "37"}, "correct_answer": "B"},
    {"id": 92, "difficulty": "hard", "question": "The range of data is 24. If the smallest observation is 8, the largest is:", "options": {"A": "16", "B": "24", "C": "30", "D": "32"}, "correct_answer": "D"},
    {"id": 93, "difficulty": "hard", "question": "For a symmetric distribution, which is true?", "options": {"A": "Mean = Median = Mode", "B": "Mean > Median > Mode", "C": "Mean < Median < Mode", "D": "Mean = Median but not Mode"}, "correct_answer": "A"},
    {"id": 94, "difficulty": "hard", "question": "The median of first 99 natural numbers is:", "options": {"A": "49", "B": "50", "C": "51", "D": "99"}, "correct_answer": "B"},
    {"id": 95, "difficulty": "hard", "question": "If the mean of 5 numbers is 10 and mean of another 10 numbers is 20, combined mean is:", "options": {"A": "15", "B": "16", "C": "16.67", "D": "18"}, "correct_answer": "C"},
    {"id": 96, "difficulty": "hard", "question": "The sum of 15 observations is 420. The mean is:", "options": {"A": "20", "B": "28", "C": "30", "D": "35"}, "correct_answer": "B"},
    {"id": 97, "difficulty": "hard", "question": "Data: 3, 5, 7, 9, 11. If each number is doubled, new median is:", "options": {"A": "7", "B": "10", "C": "14", "D": "18"}, "correct_answer": "C"},
    {"id": 98, "difficulty": "hard", "question": "For a data set with 50 observations, the median class is where cumulative frequency reaches:", "options": {"A": "25", "B": "25.5", "C": "26", "D": "50"}, "correct_answer": "A"},
    {"id": 99, "difficulty": "hard", "question": "The modal class for data with highest frequency 35 is:", "options": {"A": "Class with frequency 35", "B": "Class before it", "C": "Class after it", "D": "Cannot determine"}, "correct_answer": "A"},
    {"id": 100, "difficulty": "hard", "question": "If mean of a, a+3, a+6, a+9, a+12 is 10, then a =", "options": {"A": "1", "B": "2", "C": "4", "D": "5"}, "correct_answer": "C"}
  ]
}