Electricity — Science STD 10 — Question

A real image of an object is to be obtained. The mirror required for this purpose is:

1. Convex.
2. Concave.
3. Plane.
4. Either convex or concave.

An induced current is produced when a magnet is moved into a coil. The magnitude of induced current does not depend on:

The colour of white light which suffers the maximum bending (or maximum refraction) on passing through a glass prism is:

The blue colour of sky is due to:

The force exerted on a current-carrying wire placed in a magnetic field is zero when the angle between the wire and the direction of magnetic field is:

The back face of a circular loop of wire is found to be south magnetic pole. The direction of current in this face of the circular loop of wire will be:

1. Towards south.
2. Clockwise.
3. Anticlockwise.
4. Towards north.

For finding the focal length of a convex lens by obtaining the image of a distant object, one should use as the object:

A ray of light is incident on a plane mirror making an angle of 90° with the mirror surface. The angle of reflection for this ray of light will be:

Which of the following is the properties of magnetic field lines?