Electricity — Science STD 10 — Question

Cataract is due to the growth of ________

Fill in the following blanks with suitable words:
A person is short-sighted if his eyeball is too ____ Spectacles with a _____ lens are needed. A person is long sighted if his eyeball is too _____ Spectacles with a ____ lens are needed. These focus light rays exactly on to the _____.

Fill in the following blanks with suitable words:

Parallel rays of light are reflected by a concave mirror to a point called the _____.

Force on a charge in a magnetic field is absent when the velocity and magnetic field are ______.

If a coil is viewed from one end, and the current flows in a clockwise direction, then this end is a ________.

For a convex mirror, parallel rays of light appear to diverge from a point called the ______ .

Speed of light of all colours is same in ________

Fill in the following blanks with suitable words:
A current is a flow of _________ For this to happen there must be a _________.

To bring light from a near object to a focus on the retina of the eye, the convex eye-lens needs to be made ____.

A ray of light which is parallel to the principal axis of a convex mirror, appears to be coming from ______ after reflection from the mirror.