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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? यदि पेंटिंग की लागत 12 रुपये प्रति वर्ग मीटर सतह क्षेत्रफल है, तो 9 मीटर की ऊंचाई और 154 वर्ग मीटर के आधार क्षेत्रफल के साथ एक ठोस लंब वर्तुल बेलन की सभी सतहों को पेंट करने में कितना खर्च आएगा? |

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? यदि किसी बेलनाकार वस्तु का आयतन 2156 घन सेमी और ऊँचाई 14 सेमी है, तो इसकी त्रिज्या ज्ञात कीजिए? |

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? 35 सेमी ऊंचाई और 6 सेमी आधार त्रिज्या के एक लम्ब वृत्तीय बेलन की व्रक पृष्ठीय क्षेत्रफल ज्ञात करे? |

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 एक घनाभ का आयतन 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 |