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If cost of painting is Rs 12 per sq meter of surface area, how much will it cost to paint all surfaces of a solid right circular cylinder with height of 9 meters and base area of 154 sq meters? |

A) Rs. 8448 B) Rs. 9372 C) Rs. 1540 D) Rs. 3180 Correct Answer :Rs. 8448 Explanation :Base area of cylinder = πr Then, Total Surface Area of cylinder = 2πr(h + r) = 2π*7*(9 + 7) Hence, Cost of painting = 12 * 704 |

If the volume of a cylinder is 2156 cubic cm and height is 14 cm, find its radius? |

A) 14 cm B) 21 cm C) 3.5 cm D) 7 cm Correct Answer :7 cm Explanation :h = 14 cm, r = ? |

Find the curved surface area of a right circular cylinder of height 35 cm and the base radius 6 cm? |

A) 1220 cm B) 1230 cm C) 1320 cm D) 1330 cm Correct Answer :1320 cm Explanation :Curved surface area of cylinder= 2πrh |

The volume of a cuboid is 3600 m |

A) 1788 m B) 1432 m C) 1825 m D) 588 m Correct Answer :1788 m Explanation :volume of a cuboid, V = LBH (L=length, B = breadth, H=height). Total Surface Area = 2(LB + BH + HL) |

A ball of radius 1 cm is put into a cylindrical pipe so that it fits inside the pipe. If the length of the pipe is 14 m, what is the surface area of the pipe? |

A) 2200 square cm B) 4400 square cm C) 8800 square cm D) 17600 square cm Correct Answer :8800 square cm Explanation :Radius of cylinder pipe = 1 cm Length or height of cylinder pipe = 14 m = 1400 cm Surface Area of cylinder pipe = 2πrh Surface area of cylinderpipe = 2 × 22/7 × 1 × 1400 Surface Area = 8800 square cm |

If the surface area of a sphere is reduced to one ninth of the area, its radius reduced to ? |

A) One-fourth
B) One-third
C) One-fifth
D) One-ninth Correct Answer :One-third Explanation :Let original and new radius of the sphere are r and R respectively according to the question |

Ice-cream, completely filled in a cylinder of diameter 35 cm and height 32 cm, is to be served by completely filling identical disposable cones of diameter 4 cm and height 7 cm. The maximum number of persons that can be served in this way is? |

A) 950
B) 1000
C) 1050
D) 1100 Correct Answer :1050 Explanation :Volume of cylinder = πr Number of persons = Volume of cylinder / Volume of cone |