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प्रश्न
A plumbline (sahul) is the combination of (see figure) ______.
विकल्प
a cone and a cylinder
a hemisphere and a cone
frustum of a cone and a cylinder
sphere and cylinder
उत्तर
A plumbline (sahul) is the combination of (see figure) a hemisphere and a cone.
Explanation:
The upper part of plumbline = hemispherical
The bottom part of plumbline = conical
Therefore, it is a combination of hemisphere and cone.
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Statement A (Assertion): Total Surface area of the top is the sum of the curved surface area of the hemisphere and the curved surface area of the cone.
Statement R( Reason): Top is obtained by joining the plane surfaces of the hemisphere and cone together.
