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Maths Quiz for Class 7 Probability |
In this post, you will find 20 online maths quiz questions
for class 7 probability. Online maths quiz will take around 20 minutes or less
to complete it.
Question 1: When a coin is tossed, then the sample space is ____________.
A) {H, H}
B) {T, T}
C) {H, T}
D) {H}
Explanation: If a coin is tossed, then either a head or a tail appears, therefore, the sample space is {H, T}.
Question 2: When a die is rolled, then the sample space is ________________.
A) {1, 2, 3, 4, 5, 6}
B) {1, 2, 3, 4, 5}
C) {1, 2, 3, 4}
D) {1, 2, 3}
Explanation: When a die is rolled, then the sample space is {1, 2, 3, 4, 5, 6}.
Question 3: If a coin is tossed, then the probability of getting a head in percentage form is ___________.
A) 50%
B) 75%
C) 25%
D) 100%
Explanation: When a coin is tossed, the probability of getting a head = ½ = ½ × 100% = 50%
Question 4: If a die is rolled, then the probability of getting an even number is ___________.
A) 1/3
B) ½
C) ¼
D) 1/6
Explanation: When a die is rolled, the outcomes are {1, 2, 3, 4, 5, 6}. The favourable outcomes are {2, 4, 6}. Here, n(E) = 3 and n(S) = 6. Thus, the probability of getting an even number = n(E)/n(S) = 3/6 = ½
Question 5: If a die is rolled, then the probability of getting an odd number is ___________.
A) ¼
B) ½
C) 1/3
D) 1/5
Explanation: When a die is rolled, the outcomes are {1, 2, 3, 4, 5, 6}. The favourable outcomes are {1, 3, 5}. Here, n(E) = 3 and n(S) = 6. Thus, the probability of getting an odd number = n(E)/n(S) = 3/6 = ½
Question 6: If a die is rolled, then the probability of getting a prime number is ___________.
A) ¼
B) 1/3
C) ½
D) 1/6
Explanation: When a die is rolled, the outcomes are {1, 2, 3, 4, 5, 6}. The favourable outcomes are {2, 3, 5}. Here, n(E) = 3 and n(S) = 6. Thus, the probability of getting a prime number = n(E)/n(S) = 3/6 = ½
Question 7: Two coins are tossed simultaneously. What is the probability of getting tails on both the coins?
A) 1/3
B) ¼
C) ½
D) 1/5
Explanation: When two coins are tossed, the sample space is {HH, HT, TH, TT}. Here, n(E) = 1 and n(S) = 4. Therefore, the probability of getting tails on both the coins = n(E)/n(S) = ¼
Question 8: If a die is rolled, then what is the probability of getting neither an even number nor an odd number?
A) 1
B) ½
C) ¼
D) 0
Explanation: When a die is rolled, we get either an even number or an odd number. So, this is an impossible event. Thus, the probability of getting neither an even number nor an odd number = 0.
Question 9: When a die is thrown at random, what is the probability of getting a number less than 3?
A) 1/3
B) ½
C) ¼
D) 1/6
Explanation: When a die is thrown, the number less than 3 are {1, 2}. So, n(E) = 2 and n(S) = 6. Therefore, the probability of getting a number less than 3 = n(E)/n(S) = 2/6 = 1/3
Question 10: When three coins are tossed simultaneously, then what is the probability of getting two heads?
A) 4/8
B) 2/8
C) 3/8
D) 1/8
Explanation: When three coins are tossed, the sample space is {HHH, HHT, HTH, THH, TTH, THT, HTT, TTT}. Here, the favourable outcomes are {HHT, HTH, THH}. So, n(E) = 3 and n(S) = 8. Therefore, the probability of getting two heads = n(E)/n(S) = 3/8
Question 11: The letters of the word KOLKATA are written on different cards placed in a bowl. If one card is selected at random, then find the probability that the selected card is K.
A) 1/7
B) 2/7
C) 3/7
D) 4/7
Explanation: Here, n(E) = 2 and n(S) = 7. Therefore, the probability of selecting the card with letter K = 2/7
Question 12: If one letter of the word CHENNAI is selected at random, then what is the probability that the selected letter is a vowel?
A) 2/7
B) 3/7
C) 4/7
D) 5/7
Explanation: In the word CHENNAI, E, A and I are vowels. Here, n(E) = 3 and n(S) = 7. Therefore, the probability of selecting a vowel = 3/7
Question 13: A bag contains 5 red, 6 green and 4 blue balls. If a ball is picked up at random from the bag, then what is the probability that the ball is red?
A) 1/3
B) 1/4
C) 1/5
D) 1/15
Explanation: Total number of balls = 5 + 6 + 4 = 15. Red balls = 5. Probability of getting a red ball P(R) = 5/15 = 1/3
Question 14: A basket contains 8 apples, 5 bananas, 6 oranges and 1 pomegranate. If a fruit is picked up at random, then what the probability of getting an orange?
A) 1/20
B) 2/5
C) 1/4
D) 3/10
Explanation: Total number of fruits = 8 + 5 + 6 + 1 = 20. Number of oranges = 6. Probability of getting an orange P(O) = 6/20 = 3/10
Question 15: In a class of 40 students, 25 are boys. If a class representative is selected at random, then what is the probability that the selected class representative is a girl?
A) 1/8
B) 2/8
C) 3/8
D) 4/8
Explanation: Total number of students in the class = 40. Number of girls = 40 – 25 = 15. Probability of selecting a girl as class representative = 15/40 = 3/8
Question 16: A letter from the word LONDON is chosen at random. What is the probability that the selected letter is a consonant?
A) 1/6
B) 2/3
C) 1/3
D) 3/6
Explanation: Number of letters in the word LONDON = 6. Number of consonants in the word LONDON = 4. Probability of getting a consonant = 4/6 = 2/3
Question 17: A die a thrown at random. What is the probability of getting a number less than 7?
A) 1
B) ½
C) 1/3
D) ¼
Explanation: When a die is thrown, the sample space = {1, 2, 3, 4, 5, 6}. All the numbers are less than 6. Therefore, n(E) = 6 and n(S) = 6. This is a sure event. Thus, the probability of getting a number less than 7 = 6/6 = 1
Question 18: Two dice are thrown simultaneously. What is the probability of getting 6 on both the dice?
A) 1/6
B) 1/9
C) 1/36
D) 1/18
Explanation: When two dice are thrown simultaneously, total number of outcomes n(S) = 36 and favourable outcomes = 1 that is {6, 6}. Therefore, the probability of getting 6 on both the dice = 1/36
Question 19: There are 20 cards numbered from 1 to 20. A card is selected at random. What is the probability that the selected card has a prime number?
A) 1/5
B) 2/5
C) 3/5
D) 4/5
Explanation: Total number of cards = 20. Prime numbers from 1 to 20 are 2, 3, 5, 7, 11, 13, 17 and 19. These are 8 numbers. So, n(E) = 8 and n(S) = 20. Therefore, the probability of selecting a card with prime number = 8/20 = 2/5
Question 20: In a bag of 20 crayons, 8 are red, 5 are green, 4 are blue and remaining are yellow. If a crayon is selected at random, what is the probability that the selected crayon is yellow?
A) 1/20
B) 2/20
C) 3/20
D) 4/20
Explanation: Total number of crayons = 20. Number of yellow crayons = 20 – (8 + 5 + 4) = 20 – 17 = 3. Probability of selecting a crayon with yellow colour = 3/20
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