Magnetic Effects of Electric Current — Science STD 10 — Question

A ray of light strikes a plane mirror PQ at an angle of incidence of 30°, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is:

As light from a far off star comes down towards the earth:

Coulomb is the SI unit of:

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

The animals called predators have:

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

A convex lens of focal length 8cm forms a real image of the same size as the object. The distance between object and its image will be:

1. 8cm
2. 16cm
3. 24cm
4. 32cm

The disposal of waves produced in a nuclear power plant poses a big problem because it is:

1. Too heavy.
2. Highly inflammable.
3. Extremely foul smelling.
4. Highly radioactive.

The force experienced by a current-carrying conductor placed in a magnetic field is the largest when the angle between the conductor and the magnetic field is:

1. 45°
2. 60°
3. 90°
4. 180°

Magnification produced by a plane mirror is:

1. Less than one.
2. Greater than one.
3. Zero.
4. Equal to one.