Electricity — Science STD 10 — Question

A 1.25kW heater works on a 220 B mains supply. What current rating would a suitable fuse have?

1. 2A
2. 5A
3. 10A
4. 13A

Magnification produced by a concave lens is always:

If there had been one eye of the man, then:

To convert an AC generator into DC generator:

1. Split-ring type commutator must be used.
2. Slip rings and brushes must be used.
3. A stronger magnetic field has to be used.
4. A rectangular wire loop has to be used.

The work done in moving a unit charge across two points in an electric circuit is a measure of:

1. Current.
2. Potential difference.
3. Resistance.
4. Power.

An object is placed at a large distance in front of a concave mirror of radius of curvature 40cm. The image will be formed in front of the mirror at a distance:

1. 20cm
2. 30cm
3. 40cm
4. 50cm

The animals of prey have:

1. Two eyes at the front.
2. Two eyes at the back.
3. Two eyes on the sides.
4. One eye at the front and one on the side.

If the image formed is always virtual, the mirror can be:

If the current through a floodlamp is 5A, what charge passed in 10 seconds?

1. 0.5C.
2. 2C.
3. 5C.
4. 50C.

Figure shows a ray of light as it travels from medium A to medium B. Refractive index of the medium B relative to medium A is: