10 - Maths - Unit 12. Probability

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10 - Maths - Unit 12. Probability

Prepared by Mr. A. GANESAN, VICE PRINCIPAL, SHRI GURU BRAMMA VIDHYALAYA, KARUR-5                                & www. Padasalai. Net  


Questions and Answers
  • 1. 
    If Ø is an impossible event, then  P(Ø) =
    • A. 

      0

    • B. 

      1

    • C. 

      1/4

    • D. 

      1/2

  • 2. 
    If S is the sample space of a random experiment, then P(S) =
    • A. 

      1

    • B. 

      0

    • C. 

      1/8

    • D. 

      1/2

  • 3. 
    If p is probability of an event A, then p satisfies =
    • A. 

      0 ≤ p ≤ 1

    • B. 

      0 < p < 1

    • C. 

      0 ≤ p < 1

    • D. 

      0 < p ≤ 1

  • 4. 
    Let A and B be any two events and S be the corresponding sample space. Then P(Ā ∩B)=
    • A. 

      P(B)- P(A∩B)

    • B. 

      P (A ∩B)- P(B)

    • C. 

      P(S)

    • D. 

      P[ (AUB)']

  • 5. 
    The Probability that a student will score centum in mathematics is 4/5. The Probability that he will not score centum is = 
    • A. 

      1/5

    • B. 

      2/5

    • C. 

      3/5

    • D. 

      4/5

  • 6. 
    If A and B are two events such that P(A) = 0.25, P(B) = 0.05 and P(A∩B)=0.14, then P(AUB) =
    • A. 

      0.16

    • B. 

      0.61

    • C. 

      0.14

    • D. 

      0.6

  • 7. 
    There are 6 defective items in a sample of 20 items. One item is drawn at random. The Probability that it is a non-defective item is 
    • A. 

      7/10

    • B. 

      0

    • C. 

      3/10

    • D. 

      2/3

  • 8. 
    If A and B are mutually exclusive events and S is the Sample space such that  P(A) =1/3P(B) and S= AUB, then P(A)=
    • A. 

      1/4

    • B. 

      1/2

    • C. 

      3/4

    • D. 

      3/8

  • 9. 
    The Probabilities of three mutually exclusive events A, B  and C are given by 1/3,1/4 and 5/12. Then P(AUBUC)  is
    • A. 

      1

    • B. 

      19/12

    • C. 

      11/12

    • D. 

      7/12

  • 10. 
    If P(A)= 0.25 , P(B)= 0.50 , P(AB) = 0.14 then  P(neither A or B ) =
    • A. 

      0.39

    • B. 

      0.25

    • C. 

      0.11

    • D. 

      0.24

  • 11. 
    A bag contains 5 black balls , 4 white balls and 3 red balls. If a ball is selected at random , the probability that it is not red is = 
    • A. 

      3/4

    • B. 

      5/12

    • C. 

      4/12

    • D. 

      3/12

  • 12. 
    Two dice are thrown simultaneously. The probability of getting a doublet is =
    • A. 

      1/6

    • B. 

      1/36

    • C. 

      1/3

    • D. 

      2/3

  • 13. 
    A fair die is thrown once . The probability of getting a prime or composite number is 
    • A. 

      5/6

    • B. 

      1

    • C. 

      0

    • D. 

      1/6

  • 14. 
    Probability of getting 3 heads or 3 tails in tossing a coin 3 times is
    • A. 

      1/4

    • B. 

      1/8

    • C. 

      3/8

    • D. 

      1/2

  • 15. 
    A card is drawn from a pack of 52 cards at random. The probability of getting neither an ace  nor a king card is
    • A. 

      11/13

    • B. 

      2/13

    • C. 

      4/13

    • D. 

      8/13

  • 16. 
    The probability that a leap year will have 53 fridays or 53 saturdays is
    • A. 

      3/7

    • B. 

      2/7

    • C. 

      1/7

    • D. 

      4/7

  • 17. 
    The Probability that a non-leap year will have 53 Sundays and 53 Mondays is 
    • A. 

      0

    • B. 

      1/7

    • C. 

      2/7

    • D. 

      3/7

  • 18. 
    The Probability of selecting a queen of hearts when a cards is drawn from a pack of 52 playing cards is 
    • A. 

      1/52

    • B. 

      16/52

    • C. 

      1/13

    • D. 

      1/26

  • 19. 
    The Probability of sure event is 
    • A. 

      1

    • B. 

      0

    • C. 

      100

    • D. 

      0.1

  • 20. 
    • A. 

      2/3

    • B. 

      1/3

    • C. 

      1

    • D. 

      0