CBSE Board Practice

Class VI Class VII Class VIII Class IX Class X
CBSE Grade X - Probability
Question 1
1.
A die is thrown twice. What is the probability that 6 will not come up either time?
  • 11
    36
  • 25
    36
  • 26
    37
  • 2
    3
  • 13
    18
Question 2
2.
A die is thrown twice. What is the probability that 6 will come atleast once?
  • 11
    36
  • 12
    37
  • 1
    3
  • 25
    36
  • 5
    18
Question 3
3.
A die is thrown twice. What is the probability that 6 will come up atleast once?
  • 12
    37
  • 11
    36
  • 25
    36
  • 1
    3
  • 5
    18
Question 4
4.
A bag contains 10 blue marbles, 40 red marbles, 45 white marbles and 40 yellow marbles. One marble is drawn at random from the bag. Find the probability that the marble drawn is neither white nor yellow.
  • 11
    27
  • 10
    27
  • 17
    27
  • 11
    28
  • 1
    3
Question 5
5.
Which of the following are true?
a)
    • P(E) - P(
    •  

      E
       
       
    • ) = 0
b)
    • P(E) - P(not E) = 0
c)
    • P(E) + P(
    •  

      E
       
       
    • ) = 0
d)
    • P(E) + P(not E) = 1
e)
    • P(E) = 1 - P(
    •  

      E
       
       
    • )
  • {d,e}
  • {c,a,d}
  • {b,e,d}
  • {b,e}
  • {a,d}
Question 6
6.
Two unbiased coins are tossed simultaneously. Find the probability of getting exactly one head.
  • 5
    6
  • 4
    5
  • 2
    3
  • 3
    4
  • 1
    2
Question 7
7.
A lot of 32 bulbs contain 17 defective ones. One bulb is drawn at random from the lot. Suppose the bulb drawn is not defective and is not replaced. Now one bulb is drawn at random from the rest. What is the probability that this bulb is not defective ?
  • 17
    31
  • 14
    31
  • 15
    32
  • 15
    31
  • 13
    31
Question 8
8.
An unbiased die is thrown once. Find the probability of getting a number between 3 and 4?
  • 3
    4
  • 1
  • 0
  • 1
    2
  • 1
    4
Question 9
9.
A coin is tossed 50 times and head appears 25 times. If the coin is tossed again, what is the probability of getting a tail?
  • 4
    5
  • 3
    4
  • 5
    6
  • 2
    3
  • 1
    2
Question 10
10.
A lot of 31 bulbs contain 5 defective ones. One bulb is drawn at random from the lot. What is the probability that this bulb is defective ?
  • 3
    16
  • 6
    31
  • 4
    31
  • 5
    31
  • 26
    31