What is the special point about prism binoculars,though it is a pair of astronomical telescopes?

What is special about lungs of birds?

What is special about tissue present is heart?

What was special about symbols of elements given by Berzelius ?

Moment of inertia of the sphere about its diameter is 2/5Mr^2 . What is the moment of inertia about an axis bot to point of intersection of two diameters?

What is so special about the combination e/m? Why do we not simply talk of e and m specially?

A disc spinning clockwise about its axis with angular velocity omega_0 is set on a rough horizontal plane[Fig.]. What si the direction of frictional force at point P and sense of frictional torque ,before pure rolling starts? .

What is the magnifying power of an astronomical telescope in normal adjustment? What is its length?

Write the distribution of electrons in an atom of element whose atomic number is 18. What is special about the outermost electron shell (or valence shell) of the atom of this element ?