Question

PART A
(Questions 1 to 10 carry I mark each)
1. In a class of 40 students, 24 are boys and the rest are girls. Find
the probability that a student selected will be a girl.
2. Two coins are tossed simultaneously. Find the probability of
getting:(a) two heads (b) at least one head.
3. Find the area of a ring shaped region enclosed between two
concentric circles of radii 20cm and 15 cm.
R
4. If the perimeter and area of a circle are numerically equal. Find
its radius.
5. Find the area of a sector of a circle with radius 6cm and angle at
center is 600
6. A solid piece of iron in the form of a cuboid of dimension
49cmx33cmx24cm is melted to form a solid sphere. Find the
radius of sphere.
7. An underground water tank is in the form of a cuboid of edges
48m,36mand 28m. Find the volume of the tank.
8. The diameter of the base of a right circular cylinder is 28 cm
and its height is 21cm. Find its curved surface area.
9. The surface area of two spheres are in the ratio 16:9.The ratio
of their volume is ------
10. A cylinder, a cone and a hemisphere have same base and
same height. Find the ratio of their volumes.​

Answer 1

Answer:

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