Electricity — Science STD 10 — Question

The refractive indexes of four substances P, Q, R and S are 1.77, 1.50, 2.42 and 1.31 respectively. When light travelling in air is incident on these substances at equal angles, the angle of refraction will be the maximum in:

In a filament type light bulb, most of the electric power consumed appears as:

The speed of light in air is:

Two resistors of resistance 2Ω and 4Ω when connected to a battery will have:

1. Same current flowing through them when connected in parallel.
2. Same current flowing through them when connected in series.
3. Same potential difference across them when connected in series.
4. Different potential difference across them when connected in parallel.

If a magnification of, -1 is to be obtained by using a converging lens of focal length 12cm, then the object must be placed:

1. Within 12cm.
2. At 24cm.
3. At 6cm.
4. Beyond 24cm.

The real image formed by a concave mirror is smaller than the object if the object is:

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

One of the following does not contribute to acid rain. That is:

1. Nitrogen monoxide.
2. Sulphur dioxide.
3. Carbon monoxide.
4. Carbon dioxide.

The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was:

Refractive indices of water, sulphuric acid, glass and carbon disulphide are 1.33, 1.43, 1.53 and 1.63 respectively. the light travels slowest in:

1. Sulphuric acid.
2. Glass.
3. Water.
4. Carbon disulphide.