Question

each and Q. Nos. 9-10 carry 4 marks each.arks each.
The ratio between the radius of the base and height of a cylinder is 213.
volume is 1617 cm", find the total surface area of the


cylinder,
/Three cubes each of side 4 cm are joined end to end. Find the surface area of
resulting cuboid.
B A river 3m deep and 40 m wide is flowing at the rate of 2km per hour. How m
water will fall into the sea in a minute?
y The radii of two right circular cylinders are in the ratio 213 and their height
in the ratio 5 : 4. Calculate the ratio of their curved surface areas,
(52 How many metres of cloth 5 m wide will be required to make a concial ten
radius of whose base is 7 m and height is 24 m?
6. A sphere, a cylinder and a cone are of same radius and same height. Find the
of their curved surfaces.
7. The curved surface area of a cone is 4070 cm and its diameter is 70 cm
slant height.
8. A rectangular tank measuring 5m x 2.5m x 2.1 m is dug in the centre of th
measuring 13.5m x 4.5 m. The earth dug out is spread evenly over the rem
portion of the field. How much is the level of the field raised?
9. A cylindrical road roller made of iron is 1 m wide. Its inner diameter is 54
thickness of iron sheet rolled is 9 cm. Find the weight of the roller, f 1 cu
iron weighs 8 g​

Answer 1

is that diamond is (uncountable) a glimmering glass-like mineral that is an allotrope of carbon in which each atom is surrounded by four others in the form of a tetrahedron while coal is (uncountable) a black rock formed from prehistoric plant remains, composed largely of carbon and burned as a fuel.