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Volume & Surface Areas

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61.

The number of coins, 1.5 cm in diameter and 0.2 cm thick to be melted to form a right circular cylinder of height 10 cm and diameter 4.5 cm is

Answer: C

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Answer: A

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63.

The radius (in cm) of the largest right circular cone that can be cut out from a cube of edge 4.2 cm is

Answer: B

Edge of the cube = 4.2 cm
Diameter of base of largest possible cone = 4.2 cm 4 2
∴ Radius = 4.2/2 = 2.1 cm

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64.

How many bags of grain can be stored in a cuboid granary 12 m × 6 m × 5 m. If each bag occupies a space of 0.48 m⊃3;?

Answer: A

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65.

The curved surface area of glass having radii 3 cm and 4 cm respectively and slant height 10 cm is

Answer: C

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66.

A cone has a circular base of radius 6m and volume 84π m⊃3;. height of cone is

Answer: A

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67.

If a rectangular tank is 21cm long, 13cm wide and 18cm high and contains water up to a height of 11cm then total surface area is

Answer: D

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68.

If volume of cylinder is 900cm⊃2; with height of 20cm then diameter of cylinder is

Answer: B

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69.

2 cm thick 14 metal plates are kept exactly one above the other. On the top plate a hemisphere of diameter 6cm is kept. This just covers the top plate. What is the volume of the entire object?

Answer: D

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70.

A solid with polygonal base and vertex is a

Answer: B

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