Its centre of gravity remains at the lowest position
It is tapered at the top
It covers a large base area
The vertical line through the centre of gravity of the tower falls within its base
The least penetrating power ray is
The Length of the Day is determined in
The lens used in a simple microscope is
The light rays used for eliminating bacteria
The lightest radioactive element is
The liquid metal is
The locomotion of insects to the source of light is called :
The long range potential of nuclear energy in India depends on its reserves of
The loudness of a sound wave is determined by its
The loudness of sound depends upon