BOARD QUESTIONS 2019-2020
(PROBABILITY + AREA RELATED TO
CIRCLE)
1 MARK
1. The probability of an event that is
sure to happen is ________
2. If the probability of an event E happening
is 0.023, then P(E’) = __________
3. The Probability of an impossible
event is ___
4. A coin is tossed twice. Find the
probability og getting head both the times.
5. A dice is thrown once. If getting a
six, is a success, then find the probability of a failure.
2 MARKS
6. A letter is selected at random
from the set of English alphabets. What is the probability that it is a vowel?
7. 14 defective bulbs are accidentally
mixed up with 98 good ones. It is not possible to just look at the bulb and
tell whether it is defective or not. One bulb is taken out at random from this
lot. Determine the probability that the bulb taken out is a good one.
3 MARKS
8. In the given AB and CD are two
diameters of a circle (with centre O) perpendicular to each other and OD is the
diameter of the smaller circle. If OA = 7 cm, then find the area of shaded
region.
9. In the given figure ABCD is a square
with side 7 cm. a circle is drawn circumscribing the square. Find the area of
the shaded region.
10.
In
the given figure, square OPQR is inscribed in a quadrant OABC of a circle. If
the radius of circle is (6 √2) cm,
find the area of shade region.
11.
the
given figure, ABCD is a parallelogram. A semicircle with centre O and the diameter
AB has been drawn and it passes through D. if AB = 12 cm and OD ⊥ AB, then find the area of the shaded region. (use pi = 3.14).
12.
Read
the following passage and answer the questions given at the end of the passage:
DIWALI FAIR
A game in a booth at a Diwali fair involves using a spinner first. Then,
if the spinner stops on an even number, the player is allowed to pick a marble
from a bag. The spinner and the marbles in the bag are represented in the given
figure.
Prizes are given, when a black marble is picked. Shweta plays the game
once.
i)
What is the probability that she will be allowed to pick a marble from bag?
ii)
Suppose she is allowed to pick a marble from the bag, what is the probability
of getting a prize, when it is given that the bag contains 20 balls out of
which 6 are black?
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