Question

A sandglass is a device used to measure time. It is also known as an hour glass, sand timer or sand clock Generally, it consists of two glass bulbs placed one above the other which are connected by a narrow tube. A special sand glass is shown in figure In it two cones A and B are placed in a cylindrical tube much that their vertex touches each other inside the tube.

(1) The height of the cylinder is 21cm and the base dinmeter is 6 cm. Both conenare identical. The Capacity of each cone is a) 144 cm b) 121 cm c) 99 cm d) 88 cm

(1) The Outer surface area of cylindrical glass is a) 268.36 cm? b) 396.85 cm2 c) 401.69 cm dy 88 cm

() The volume of the remaining portion of the cylinder is a) 225 cm b) 396 cm c) 409 cm d) 460 cm

(iv) The sum of areas of bases of cones is a) 56 57 cm b) 78.34 cm c) 84 cm

(v) Curved surface area of the cylindrical glass is

d) 68,5 cm

a) 272 cm2 b) 396 cm c) 420 cm dj None of these​



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Answer 1

Answer:

An hourglass (or sandglass, sand timer, sand clock or egg timer) is a device used to measure the passage of time. It comprises two glass bulbs connected vertically by a narrow neck that allows a regulated flow of a substance (historically sand) from the upper bulb to the lower one.

Answer 2

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Step-by-step explanation:

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