A man can row 25/2 km an hour in still water and he finds that it takes him thrice as long to row up as to row down the river. The rate of stream is:

The point where the total mass of a body is considered to be concentrated is known as what?

A larger force on a rotating body results in larger _____.

The term ‘Isoneph' indicates the lines of equal –

Which of the following statement is correct?

I. Magnetite is a natural magnet

II. A freely suspended magnet always aligns in N-S direction

__________ is the metal used for making the filament of the light bulb.

Which of the following is caused due to the Newton’s first law of motion?

The potential inside a charged hollow sphere is __________.

The mass and energy equivalent to 1 a.m.u. respectively are -