{
  "title": "Probability Basics - Simple Events (Data Handling) - Grade 8 CBSE",
  "total_questions": 100,
  "questions": [
    {"id": 1, "difficulty": "easy", "question": "What is probability?", "options": {"A": "A measure of how likely an event is to occur", "B": "A type of graph", "C": "The average of data", "D": "The range of data"}, "correct_answer": "A"},
    {"id": 2, "difficulty": "easy", "question": "The probability of an event that cannot happen is:", "options": {"A": "0", "B": "0.5", "C": "1", "D": "2"}, "correct_answer": "A"},
    {"id": 3, "difficulty": "easy", "question": "The probability of an event that is certain to happen is:", "options": {"A": "0", "B": "0.5", "C": "1", "D": "2"}, "correct_answer": "C"},
    {"id": 4, "difficulty": "easy", "question": "Probability is always between:", "options": {"A": "-1 and 1", "B": "0 and 1", "C": "0 and 10", "D": "1 and 100"}, "correct_answer": "B"},
    {"id": 5, "difficulty": "easy", "question": "If you toss a fair coin, what is the probability of getting heads?", "options": {"A": "0", "B": "0.25", "C": "0.5", "D": "1"}, "correct_answer": "C"},
    {"id": 6, "difficulty": "easy", "question": "A die is rolled. What is the probability of getting number 7?", "options": {"A": "0", "B": "1/6", "C": "1/2", "D": "1"}, "correct_answer": "A"},
    {"id": 7, "difficulty": "easy", "question": "What is the probability of getting an even number when a die is rolled?", "options": {"A": "1/6", "B": "1/3", "C": "1/2", "D": "2/3"}, "correct_answer": "C"},
    {"id": 8, "difficulty": "easy", "question": "If the probability of an event is 0.75, it means the event is:", "options": {"A": "Impossible", "B": "Unlikely", "C": "Likely", "D": "Certain"}, "correct_answer": "C"},
    {"id": 9, "difficulty": "easy", "question": "Which is not a possible probability value?", "options": {"A": "0.01", "B": "1.1", "C": "0.5", "D": "0"}, "correct_answer": "B"},
    {"id": 10, "difficulty": "easy", "question": "An event with probability 0.05 is:", "options": {"A": "Very likely", "B": "Very unlikely", "C": "Certain", "D": "Impossible"}, "correct_answer": "B"},
    {"id": 11, "difficulty": "easy", "question": "A bag has 3 red and 2 blue balls. Probability of drawing a red ball?", "options": {"A": "1/5", "B": "2/5", "C": "3/5", "D": "4/5"}, "correct_answer": "C"},
    {"id": 12, "difficulty": "easy", "question": "What is the probability of getting a tail when tossing a coin?", "options": {"A": "0", "B": "0.25", "C": "0.5", "D": "1"}, "correct_answer": "C"},
    {"id": 13, "difficulty": "easy", "question": "The probability of an event E is written as:", "options": {"A": "E", "B": "P(E)", "C": "Prob(E)", "D": "Event(E)"}, "correct_answer": "B"},
    {"id": 14, "difficulty": "easy", "question": "If an event has probability 1, it is called:", "options": {"A": "Impossible event", "B": "Sure event", "C": "Random event", "D": "Unlikely event"}, "correct_answer": "B"},
    {"id": 15, "difficulty": "easy", "question": "All possible outcomes of an experiment are called:", "options": {"A": "Events", "B": "Sample space", "C": "Probability", "D": "Results"}, "correct_answer": "B"},
    {"id": 16, "difficulty": "easy", "question": "When a die is rolled, the sample space has how many outcomes?", "options": {"A": "4", "B": "5", "C": "6", "D": "7"}, "correct_answer": "C"},
    {"id": 17, "difficulty": "easy", "question": "The probability of getting a number less than 7 when rolling a die is:", "options": {"A": "0", "B": "1/6", "C": "5/6", "D": "1"}, "correct_answer": "D"},
    {"id": 18, "difficulty": "easy", "question": "If probability of rain tomorrow is 0.8, probability of no rain is:", "options": {"A": "0", "B": "0.2", "C": "0.8", "D": "1"}, "correct_answer": "B"},
    {"id": 19, "difficulty": "easy", "question": "A month chosen at random has 31 days. Probability = ?", "options": {"A": "1/12", "B": "7/12", "C": "5/12", "D": "1/2"}, "correct_answer": "B"},
    {"id": 20, "difficulty": "easy", "question": "From numbers 1 to 10, probability of picking an even number is:", "options": {"A": "1/10", "B": "1/2", "C": "3/5", "D": "2/5"}, "correct_answer": "B"},

    {"id": 21, "difficulty": "medium", "question": "A card is drawn from a deck of 52 cards. Probability of getting a king?", "options": {"A": "1/13", "B": "1/26", "C": "1/52", "D": "4/13"}, "correct_answer": "A"},
    {"id": 22, "difficulty": "medium", "question": "Two coins are tossed. Probability of getting at least one head?", "options": {"A": "1/4", "B": "1/2", "C": "3/4", "D": "1"}, "correct_answer": "C"},
    {"id": 23, "difficulty": "medium", "question": "A bag contains 5 white and 7 black balls. Probability of drawing a white ball?", "options": {"A": "5/7", "B": "7/12", "C": "5/12", "D": "12/5"}, "correct_answer": "C"},
    {"id": 24, "difficulty": "medium", "question": "Probability of getting a prime number when a die is rolled?", "options": {"A": "1/2", "B": "1/3", "C": "1/6", "D": "2/3"}, "correct_answer": "A"},
    {"id": 25, "difficulty": "medium", "question": "From numbers 1 to 20, probability of choosing a multiple of 3?", "options": {"A": "3/10", "B": "1/3", "C": "7/20", "D": "2/5"}, "correct_answer": "A"},
    {"id": 26, "difficulty": "medium", "question": "If P(E) = 0.35, what is P(not E)?", "options": {"A": "0.35", "B": "0.65", "C": "0.75", "D": "1.35"}, "correct_answer": "B"},
    {"id": 27, "difficulty": "medium", "question": "A jar has 10 marbles: 3 red, 5 blue, 2 green. Probability of not drawing a blue marble?", "options": {"A": "1/2", "B": "3/10", "C": "1/5", "D": "5/10"}, "correct_answer": "A"},
    {"id": 28, "difficulty": "medium", "question": "Two dice are rolled. Total number of outcomes?", "options": {"A": "12", "B": "24", "C": "36", "D": "48"}, "correct_answer": "C"},
    {"id": 29, "difficulty": "medium", "question": "Probability of getting sum 7 when two dice are rolled?", "options": {"A": "1/6", "B": "1/9", "C": "1/12", "D": "5/36"}, "correct_answer": "A"},
    {"id": 30, "difficulty": "medium", "question": "A letter is chosen from 'MATHEMATICS'. Probability of choosing 'M'?", "options": {"A": "1/11", "B": "2/11", "C": "1/13", "D": "2/13"}, "correct_answer": "B"},
    {"id": 31, "difficulty": "medium", "question": "A number is chosen from 1 to 15. Probability that it is divisible by 4?", "options": {"A": "1/5", "B": "2/15", "C": "1/3", "D": "4/15"}, "correct_answer": "A"},
    {"id": 32, "difficulty": "medium", "question": "In a class of 40, 25 are girls. Probability that a randomly chosen student is a boy?", "options": {"A": "5/8", "B": "3/8", "C": "1/2", "D": "2/5"}, "correct_answer": "B"},
    {"id": 33, "difficulty": "medium", "question": "If probability of winning a game is 0.3, probability of losing?", "options": {"A": "0.3", "B": "0.5", "C": "0.7", "D": "0.8"}, "correct_answer": "C"},
    {"id": 34, "difficulty": "medium", "question": "A card is drawn from a deck. Probability of a red king?", "options": {"A": "1/26", "B": "1/13", "C": "1/52", "D": "2/13"}, "correct_answer": "A"},
    {"id": 35, "difficulty": "medium", "question": "A die is rolled. Probability of a number greater than 4?", "options": {"A": "1/6", "B": "1/3", "C": "1/2", "D": "2/3"}, "correct_answer": "B"},
    {"id": 36, "difficulty": "medium", "question": "From a pack of cards, probability of drawing a heart?", "options": {"A": "1/4", "B": "1/13", "C": "1/52", "D": "13/52"}, "correct_answer": "A"},
    {"id": 37, "difficulty": "medium", "question": "Probability of getting a doublet when two dice are rolled?", "options": {"A": "1/6", "B": "1/12", "C": "1/18", "D": "1/36"}, "correct_answer": "A"},
    {"id": 38, "difficulty": "medium", "question": "A bag has 8 red, 6 blue balls. Probability of drawing a ball that is not red?", "options": {"A": "3/7", "B": "4/7", "C": "5/7", "D": "6/7"}, "correct_answer": "A"},
    {"id": 39, "difficulty": "medium", "question": "Probability that a leap year has 53 Sundays?", "options": {"A": "1/7", "B": "2/7", "C": "3/7", "D": "4/7"}, "correct_answer": "B"},
    {"id": 40, "difficulty": "medium", "question": "Three coins are tossed. Probability of getting exactly 2 heads?", "options": {"A": "1/8", "B": "3/8", "C": "1/2", "D": "5/8"}, "correct_answer": "B"},
    {"id": 41, "difficulty": "medium", "question": "A number from 1 to 50 is chosen. Probability that it is a perfect square?", "options": {"A": "1/10", "B": "3/50", "C": "7/50", "D": "9/50"}, "correct_answer": "C"},
    {"id": 42, "difficulty": "medium", "question": "If P(A) = 0.4, P(B) = 0.3 and A and B are mutually exclusive, P(A or B) = ?", "options": {"A": "0.7", "B": "0.12", "C": "0.1", "D": "0.58"}, "correct_answer": "A"},
    {"id": 43, "difficulty": "medium", "question": "Probability of getting a vowel from the letters of 'PROBABILITY'?", "options": {"A": "3/11", "B": "4/11", "C": "5/11", "D": "6/11"}, "correct_answer": "B"},
    {"id": 44, "difficulty": "medium", "question": "Two dice are rolled. Probability that sum is at most 5?", "options": {"A": "5/18", "B": "1/6", "C": "5/36", "D": "10/36"}, "correct_answer": "A"},
    {"id": 45, "difficulty": "medium", "question": "A card is drawn from a deck. Probability of a face card (Jack, Queen, King)?", "options": {"A": "3/13", "B": "1/13", "C": "4/13", "D": "12/13"}, "correct_answer": "A"},
    {"id": 46, "difficulty": "medium", "question": "Probability of getting a number divisible by 2 or 3 from 1 to 20?", "options": {"A": "13/20", "B": "3/5", "C": "7/10", "D": "11/20"}, "correct_answer": "A"},
    {"id": 47, "difficulty": "medium", "question": "A die is rolled twice. Probability that both numbers are same?", "options": {"A": "1/6", "B": "1/12", "C": "1/18", "D": "1/36"}, "correct_answer": "A"},
    {"id": 48, "difficulty": "medium", "question": "From numbers 1 to 30, probability of a prime number?", "options": {"A": "1/3", "B": "2/5", "C": "11/30", "D": "13/30"}, "correct_answer": "A"},
    {"id": 49, "difficulty": "medium", "question": "A bag contains 20 tickets numbered 1 to 20. Probability of drawing a ticket with number multiple of 5?", "options": {"A": "1/5", "B": "3/20", "C": "1/4", "D": "2/5"}, "correct_answer": "A"},
    {"id": 50, "difficulty": "medium", "question": "Probability that a randomly chosen number from 1-100 is divisible by 6?", "options": {"A": "3/25", "B": "4/25", "C": "1/6", "D": "17/100"}, "correct_answer": "B"},
    {"id": 51, "difficulty": "medium", "question": "If probability of event A is 2/5, probability of 'not A' is:", "options": {"A": "2/5", "B": "3/5", "C": "5/2", "D": "5/3"}, "correct_answer": "B"},
    {"id": 52, "difficulty": "medium", "question": "A box contains 10 bulbs, 2 are defective. Probability of drawing a non-defective bulb?", "options": {"A": "1/5", "B": "2/5", "C": "3/5", "D": "4/5"}, "correct_answer": "D"},
    {"id": 53, "difficulty": "medium", "question": "Two coins are tossed. Probability of getting no head?", "options": {"A": "0", "B": "1/4", "C": "1/2", "D": "3/4"}, "correct_answer": "B"},
    {"id": 54, "difficulty": "medium", "question": "A die is rolled. Probability of getting a number greater than 2?", "options": {"A": "1/3", "B": "1/2", "C": "2/3", "D": "5/6"}, "correct_answer": "C"},
    {"id": 55, "difficulty": "medium", "question": "Probability of drawing a black card from a deck of 52 cards?", "options": {"A": "1/4", "B": "1/2", "C": "3/4", "D": "13/52"}, "correct_answer": "B"},
    {"id": 56, "difficulty": "medium", "question": "From letters of 'ALGEBRA', probability of choosing a vowel?", "options": {"A": "2/7", "B": "3/7", "C": "4/7", "D": "5/7"}, "correct_answer": "B"},
    {"id": 57, "difficulty": "medium", "question": "A month is chosen at random. Probability that it has less than 31 days?", "options": {"A": "1/12", "B": "1/6", "C": "1/4", "D": "5/12"}, "correct_answer": "D"},
    {"id": 58, "difficulty": "medium", "question": "Probability of getting a sum of 10 when two dice are rolled?", "options": {"A": "1/12", "B": "1/18", "C": "1/9", "D": "5/36"}, "correct_answer": "A"},
    {"id": 59, "difficulty": "medium", "question": "A card is drawn from a deck. Probability of a jack or a queen?", "options": {"A": "1/13", "B": "2/13", "C": "3/13", "D": "4/13"}, "correct_answer": "B"},
    {"id": 60, "difficulty": "medium", "question": "Probability of getting a red face card from a deck?", "options": {"A": "3/26", "B": "1/13", "C": "3/52", "D": "1/26"}, "correct_answer": "A"},
    {"id": 61, "difficulty": "medium", "question": "A number is chosen from 1-25. Probability that it is even or a multiple of 5?", "options": {"A": "13/25", "B": "14/25", "C": "3/5", "D": "16/25"}, "correct_answer": "B"},
    {"id": 62, "difficulty": "medium", "question": "Two dice are rolled. Probability that sum is a prime number?", "options": {"A": "5/12", "B": "7/18", "C": "1/2", "D": "15/36"}, "correct_answer": "D"},
    {"id": 63, "difficulty": "medium", "question": "A bag has 6 white, 4 black balls. Two balls are drawn. Probability that both are white?", "options": {"A": "1/3", "B": "2/9", "C": "5/12", "D": "1/6"}, "correct_answer": "A"},
    {"id": 64, "difficulty": "medium", "question": "From numbers 1-50, probability of a number ending with 3?", "options": {"A": "1/10", "B": "1/5", "C": "3/25", "D": "2/25"}, "correct_answer": "A"},
    {"id": 65, "difficulty": "medium", "question": "A card is drawn from a deck. Probability of a diamond or a king?", "options": {"A": "4/13", "B": "1/13", "C": "17/52", "D": "9/26"}, "correct_answer": "A"},
    {"id": 66, "difficulty": "medium", "question": "Probability of getting exactly one head when two coins are tossed?", "options": {"A": "1/4", "B": "1/2", "C": "3/4", "D": "1"}, "correct_answer": "B"},
    {"id": 67, "difficulty": "medium", "question": "A die is rolled. Probability of getting a factor of 6?", "options": {"A": "1/2", "B": "2/3", "C": "5/6", "D": "1/3"}, "correct_answer": "B"},
    {"id": 68, "difficulty": "medium", "question": "From letters of 'STATISTICS', probability of choosing 'S'?", "options": {"A": "1/5", "B": "2/5", "C": "3/10", "D": "1/3"}, "correct_answer": "C"},
    {"id": 69, "difficulty": "medium", "question": "Probability that a non-leap year has 53 Fridays?", "options": {"A": "1/7", "B": "2/7", "C": "3/7", "D": "4/7"}, "correct_answer": "A"},
    {"id": 70, "difficulty": "medium", "question": "A number is chosen from 1-100. Probability that it contains digit 7?", "options": {"A": "1/10", "B": "19/100", "C": "1/5", "D": "21/100"}, "correct_answer": "B"},
    {"id": 71, "difficulty": "medium", "question": "Two dice are rolled. Probability that sum is at least 10?", "options": {"A": "1/6", "B": "5/36", "C": "1/9", "D": "1/12"}, "correct_answer": "A"},
    {"id": 72, "difficulty": "medium", "question": "Probability of drawing a card that is neither a king nor a queen?", "options": {"A": "11/13", "B": "12/13", "C": "1/13", "D": "2/13"}, "correct_answer": "A"},
    {"id": 73, "difficulty": "medium", "question": "A bag has 12 balls numbered 1-12. Probability of drawing an odd number?", "options": {"A": "1/2", "B": "5/12", "C": "7/12", "D": "2/3"}, "correct_answer": "A"},
    {"id": 74, "difficulty": "medium", "question": "Three coins are tossed. Probability of getting at most one tail?", "options": {"A": "1/2", "B": "3/8", "C": "5/8", "D": "7/8"}, "correct_answer": "A"},
    {"id": 75, "difficulty": "medium", "question": "Probability that a randomly chosen two-digit number is divisible by 5?", "options": {"A": "1/5", "B": "9/50", "C": "18/90", "D": "1/6"}, "correct_answer": "A"},
    {"id": 76, "difficulty": "medium", "question": "A card is drawn from a deck. Probability of a spade or an ace?", "options": {"A": "4/13", "B": "1/13", "C": "17/52", "D": "9/26"}, "correct_answer": "A"},
    {"id": 77, "difficulty": "medium", "question": "From numbers 1-40, probability of a multiple of 6 or 8?", "options": {"A": "1/5", "B": "3/20", "C": "11/40", "D": "13/40"}, "correct_answer": "A"},
    {"id": 78, "difficulty": "medium", "question": "A die is rolled. Probability of getting a number less than 3 or greater than 4?", "options": {"A": "1/2", "B": "2/3", "C": "5/6", "D": "1/3"}, "correct_answer": "B"},
    {"id": 79, "difficulty": "medium", "question": "Two dice are rolled. Probability that numbers are different?", "options": {"A": "1/6", "B": "5/6", "C": "1/2", "D": "1/3"}, "correct_answer": "B"},
    {"id": 80, "difficulty": "medium", "question": "Probability that a number chosen from 1-20 is a factor of 20?", "options": {"A": "1/5", "B": "3/10", "C": "2/5", "D": "1/2"}, "correct_answer": "B"},

    {"id": 81, "difficulty": "hard", "question": "Two dice are rolled. Probability that sum is a perfect square?", "options": {"A": "5/36", "B": "7/36", "C": "1/6", "D": "11/36"}, "correct_answer": "B"},
    {"id": 82, "difficulty": "hard", "question": "A card is drawn from a deck. Probability that it is a face card or a heart?", "options": {"A": "11/26", "B": "1/2", "C": "25/52", "D": "7/13"}, "correct_answer": "A"},
    {"id": 83, "difficulty": "hard", "question": "Three coins are tossed. Probability of getting more heads than tails?", "options": {"A": "1/2", "B": "3/8", "C": "5/8", "D": "7/8"}, "correct_answer": "A"},
    {"id": 84, "difficulty": "hard", "question": "Probability that a randomly chosen three-digit number is divisible by 7?", "options": {"A": "1/7", "B": "128/900", "C": "13/90", "D": "7/64"}, "correct_answer": "B"},
    {"id": 85, "difficulty": "hard", "question": "A bag has 5 red, 4 blue, 3 green balls. Two balls are drawn. Probability that they are of same color?", "options": {"A": "19/66", "B": "5/33", "C": "1/3", "D": "2/5"}, "correct_answer": "A"},
    {"id": 86, "difficulty": "hard", "question": "From numbers 1-200, probability that a number is divisible by 3 or 5?", "options": {"A": "93/200", "B": "47/100", "C": "21/50", "D": "11/25"}, "correct_answer": "A"},
    {"id": 87, "difficulty": "hard", "question": "Two dice are rolled. Probability that product of numbers is 12?", "options": {"A": "1/9", "B": "1/12", "C": "5/36", "D": "7/36"}, "correct_answer": "A"},
    {"id": 88, "difficulty": "hard", "question": "A number is chosen from 1-1000. Probability that it is divisible by 2, 3, or 5?", "options": {"A": "0.77", "B": "0.83", "C": "0.9", "D": "0.73"}, "correct_answer": "A"},
    {"id": 89, "difficulty": "hard", "question": "A card is drawn from a deck. Probability that it is a black king or a red queen?", "options": {"A": "1/13", "B": "1/26", "C": "1/52", "D": "2/13"}, "correct_answer": "A"},
    {"id": 90, "difficulty": "hard", "question": "Three dice are rolled. Probability that sum is 10?", "options": {"A": "1/8", "B": "1/12", "C": "1/18", "D": "1/24"}, "correct_answer": "A"},
    {"id": 91, "difficulty": "hard", "question": "Probability that a leap year has 52 Mondays?", "options": {"A": "5/7", "B": "6/7", "C": "4/7", "D": "3/7"}, "correct_answer": "A"},
    {"id": 92, "difficulty": "hard", "question": "A bag contains 10 tickets numbered 1-10. Two tickets are drawn. Probability that sum is even?", "options": {"A": "1/2", "B": "2/5", "C": "4/9", "D": "5/9"}, "correct_answer": "C"},
    {"id": 93, "difficulty": "hard", "question": "Two cards are drawn from a deck without replacement. Probability that both are aces?", "options": {"A": "1/221", "B": "1/169", "C": "4/663", "D": "1/13"}, "correct_answer": "A"},
    {"id": 94, "difficulty": "hard", "question": "From letters of 'MISSISSIPPI', probability of choosing 'I'?", "options": {"A": "2/11", "B": "3/11", "C": "4/11", "D": "5/11"}, "correct_answer": "C"},
    {"id": 95, "difficulty": "hard", "question": "A die is rolled 3 times. Probability that all numbers are different?", "options": {"A": "5/9", "B": "1/2", "C": "5/18", "D": "1/6"}, "correct_answer": "A"},
    {"id": 96, "difficulty": "hard", "question": "Probability that a randomly chosen number from 1-500 is divisible by 3 but not by 5?", "options": {"A": "133/500", "B": "67/250", "C": "3/10", "D": "7/25"}, "correct_answer": "A"},
    {"id": 97, "difficulty": "hard", "question": "Two dice are rolled. Probability that sum is divisible by 4 or 5?", "options": {"A": "7/18", "B": "1/2", "C": "5/12", "D": "19/36"}, "correct_answer": "D"},
    {"id": 98, "difficulty": "hard", "question": "A bag has 6 red, 4 blue, 5 green balls. Three balls are drawn. Probability that they are of different colors?", "options": {"A": "24/91", "B": "1/3", "C": "2/7", "D": "8/35"}, "correct_answer": "A"},
    {"id": 99, "difficulty": "hard", "question": "Probability that a two-digit number chosen at random is a prime?", "options": {"A": "1/5", "B": "21/90", "C": "23/90", "D": "1/4"}, "correct_answer": "B"},
    {"id": 100, "difficulty": "hard", "question": "Three coins are tossed. Probability of getting at least two tails given that there is at least one tail?", "options": {"A": "3/7", "B": "4/7", "C": "1/2", "D": "5/7"}, "correct_answer": "A"}
  ]
}