Related Questions

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?)
ক 32Ve
খ 12Ve
গ 12Ve
ঘ 0
To have pressure wholly compressive under the base of a retaining wall of width b, the resultant of the weight of the wall and the pressure exerted by the retained, earth should have eccentricity not more than
ক $$\frac{{\text{b}}}{3}$$
খ $$\frac{{\text{b}}}{4}$$
গ $$\frac{{\text{b}}}{5}$$
ঘ $$\frac{{\text{b}}}{6}$$
Green house gases blanket/block the infrared radiation from earth's surface to the atmosphere leading to its progressive warming up. Which of the following gases does not exhibit green house effect?
ক CO2
খ H2
গ SO3
ঘ N2
পৃথিবী পৃষ্ঠে একটি ইটের ওজন 81 N. পৃথিবীর অর্ধেক বাসার্ধের সমান উচ্চতায় এবং অর্ধেক বাসার্ধের সমান গভীরতায় ইউটির উপরে পৃথিবীর অভিকর্ষ বলের মান কত হবে?(A brick weighs 81 N on the surface of the earth. What are the earth's gravitational forces act on it at a height of half of the radius of the earth and at a depth of half of the radius of earth, respectively?)
ক 36 N and 81 N
খ 36 N and 40.5 N
গ 36 N and 20.25 N
ঘ 98 and 40.5 N
ঙ 81 N and 81 N
Which of the following layers of the Earth is believed to account for the Earth's magnetism?
ক Crust
খ Mantle
গ Core
ঘ Lithosphere
The shear stress between the two liquid layers is __________ proportional to the distance between two layers.
ক Directly
খ Inversely
গ Both A and B
ঘ None of these
A steam carraying pipeline is insulated with two layers of insulating materials with the inferior insulation material forming the inner part. If the two insulating layers are interchanged, the heat conducted will
ক Increase
খ Decrease
গ Remain unaffected
ঘ May increase or decrease; depends on the thickness of each layer
There are five concentric layers within the atmosphere which is differentiated on the basis of temperature. The atmospheric layer which lies close to the earth's surface in which human being along with other organisms live is called troposphere. The rate at which air temperature in the troposphere gradually decreases with height is about __________ °C/km.
ক 0.05
খ 1
গ 6.5
ঘ 15
What is the escape velocity of the rocket in the earth?
ক 12.2 km/sec
খ 10.2 km/sec
গ 13.2 km/sec
ঘ 11.2 km/sec
The escape velocity of a body on earth which is independent of its mass is about __________ km/second.
ক 3
খ 7
গ 11
ঘ 15

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