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একটি ট্রেনের স্থির অবস্থায় দৈর্ঘ্য হলো 100 m। এটি অতি উচ্চ বেগে 80m দৈর্ঘ্যের একটি সুড়ঙ্গের মধ্য দিয়ে যায়। সুড়ঙ্গের দুই প্রান্তে অবস্থিত পর্যবেক্ষকরা লক্ষ করেন যে, একটি মুহূর্তে ট্রেনটির দৈর্ঘ্য ঠিক সুড়ঙ্গের দৈর্ঘ্যের সমান হয়। c এর এককে ট্রেন এর বেগ কত? (A train has a rest length of 100 m. Traveling at a very high velocity, it goes through a tunnel of length 80 m. Observers located at both ends of the tunnel note that at one instant the train appears to exactly fit within the tunnel. What is the velocity of the train expressed in units of c?)
A 0.866 c
B 0.333 c
C 0.5 c
D 0.6 c
Which one of the following methods is generally used for the layout of the muck-car tracks?
A The grass hopper method
B Passing track method
C The cherry picker
D All the above
channel Tunnel is an under sea rait tunnel linking.
A England & Ireland
B England & Rfance
C France & Germany
D None of these.
A train 800 meters long is running at a speed of 78 km/hr . If it crosses a tunnel in 1 minute, then the length of the tunnel ( in meters ) is :
A 360
B 500
C 540
D 130
Seikan Tunnel which is a Railway tunnel with less than half length under seabed is located in which country?
A Japan
B South Korea
C North Korea
D China
India's longest tunnel Jawahar tunnel is located in which state?
A Jammu and Kashmir
B Maharashtra
C Karnataka
D Himachal Pradesh
ধর, পৃথিবীর ব্যাস বরাবর একটি সুড়ঙ্গ খনন করা হলো এবং পৃথিবীর পৃষ্ঠ থেকে একটি ক্ষুদ্র বস্তুকে সুড়ঙ্গের মধ্যে ছেড়ে দেওয়া হলো বস্তুটি যখন পৃথিবীর কেন্দ্রে পৌঁছাবে তখন মুক্তিবেগ Ve এর সাপেক্ষে বস্তুটির বেগ কত হবে? (imagine that a tunnel is dug along a diameter of the Earth and a small body is dropped into the tunnel from the surface. What will be its speed in terms of the escape speed Ve when it reaches the centre of the Earth?)
A 32Ve
B 12Ve
C 12Ve
D 0
A screw is said to be over hauling screw, if its efficiency is
A less than 50%
B more than 50%
C equal to 50%
D none of the mentioned
A screw is said to be over hauling screw, if the
A Friction angle is less than helix angle
B Friction angle is more than helix angle
C Friction angle is equal to helix angle
D Efficiency of screw is 100%
In a sample of 50 people, 19 had type O blood, 22 had type A blood, 7 had type B blood and 2 had type AB blood. If a person is selected randomly, find the probability that the person has neither type A nor type O blood?
A 15/25
B 31/50
C 11/25
D 9/50

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