EXERCISE 25B
OBJECTIVE QUESTIONS
Tick (√) the correct answer in each of the following:
(1) In a spinning wheel, there are 3 white and 5 green sectors. It is spinned. What is the probability of getting a green sector?
Ans: (b) 5/8
Solution: Total number of ball = 8
Number of green ball = 5
∴ P (getting green ball) = 5/8
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(2) 8 cards are numbered as 1, 2, 3, 4, 5, 6, 7, 8 respectively. They are kept in a box and mixed thoroughly. One card is chosen at random. What is the probability of getting a number less than 4?
Ans: (c) 3/8
Solution: Total number of cards = 8
Number of cards which are less than 4 = 3
∴ P (getting the numbers less than 4) = 3/8
(3) Two coins are tossed simultaneously. What is the probability of getting one head and one tail?
Ans: (b) ½
Solution: Total number of outcomes = 4
Number of such outcomes = 2
∴ P (getting one head and one tail) = 2/4 = ½.
(4) A bag contains 3 white and 2 red balls. One ball is drawn at random. What is the probability that the ball drawn is red?
Ans: (d) 2/5
Solution: Total number of balls = 5
Number of red balls = 2
∴ P (getting red balls) = 2/5
(5) A die is thrown. What is the probability of getting 6?
Ans: (b) 1/6
Solution: In throwing a die, all possible outcomes are 1, 2, 3, 4, 5, 6.
Number of all possible outcomes = 1
∴ P (getting 6) = 1/6
(6) A die is thrown. What is the probability of getting an even number?
Ans; (a) ½
Solution: In throwing a die, all possible outcomes are 1, 2, 3, 4, 5, 6.
Number of all possible even numbers = 2, 4, 6 = 3
∴ P (getting even numbers) = 3/6 = ½
(7) From a well-shuffled deck of 52 cards, one card is drawn at random. What is the probability that the drawn card is a queen?
Ans: (c) 1/13
Solution: Total number of cards = 52
Number of queen = 4
∴ P (getting queens) = 4/52 = 1/13
(8) From a well-shuffled deck of 52 cards, one card is drawn at random. What is the probability that the drawn card is a black 6?
Ans: (b) 1/26
Solution: Total number of cards = 52
Number of black 6 = 2
∴ P (getting black 6) = 2/52 = 1/26
