Subject
Quantitative Aptitude
Topic
Miscellaneous
A rope makes 70 rounds of the circumference of a cylinder whose radius of the base is 14 cm.How many times can it go round a cylinder with radius 20 cm?
A rope makes 70 rounds of the circumference of a cylinder whose radius of the base is 14 cm.How many times can it go round a cylinder with radius 20 cm?
ক)
40খ)
49গ)
100ঘ)
none of theseExplanation
(প্রশ্নঃ একটি রশি একটি সিলিন্ডারের পৃষ্ঠে ৭০ বার পাক খেতে পারে সেখানে সিলিন্ডারের ভূমির ব্যাসার্ধ ১৪ সেমি। ২০ সেমি ব্যাসার্ধ বিশিষ্ট সিলিন্ডারে রশিটি কতবার ঘুরানো যেতে পারে?) সিলিন্ডারের ব্যাসার্ধ = r=14 cm অতএব সিলিন্ডারের ভূমির পরিধি = 2 π r= 2×(22/7)×14=88 cm অতএব রশিটি 70 বার 88 cm বৃত্তাকার পরিধির উপর পাক খায়। অতএব রশির দৈর্ঘ্য = 70×88 cm=6160 cm R=20 cm ব্যাসার্ধ বিশিষ্ট সিলিন্ডারের পরিধি = 2πR =2×(22/7)×20 =880/2 cm অতএব ঐ সিলিন্ডারের উপর রশিটি পাক খায় =6160/(880/7) =49 বারRelated questions
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