Related Questions

The circle in which a plane tangent to the earth's surface at the point of observation, intersects the celestial sphere, is called
A Visible horizon
B Sensible horizon
C Celestial horizon
D True horizon
________ birds navigate using celestial cues from the sun and stars, the earth's magnetic field, and probably also mental maps.
A Migration
B Migrating
C Migrate
D Migrated
The point on the celestial sphere vertically below the observer's position, is called
A Zenith
B Celestial point
C Nadir
D Pole
The zenith is the point on the celestial sphere
A East of observer
B West of observer
C North of observer
D South of observer
The most convenient co-ordinate system for specifying the relative positions of heavenly bodies on the celestial sphere, is
A Altitude and azimuth system
B Declination and hour angle system
C Declination and right ascension system
D Declination and altitude system
The position of a heavenly body on the celestial sphere can be completely specified by
A Its altitude and azimuth
B Its declination and hour angle
C Its declination and right ascension
D All the above
Celestial : Sun : : Ocean : ?
A Milkyway
B Sea
C Port
D Ship
The radius of circle A is r, and the radius of circle B is 3/4r. What is the ratio of the area of circle A to the area of circle B?
A 16 to 9
B 9 to 16
C 1 to 4
D 4 to 3
The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth's early life and solidified into hard rock's called
A granite
B basalt
C igneous rocks
D sedimentary rocks
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

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