Magnetic Effects of Electric Current — Science STD 10 — Question

For a ray of light passing through a glass slab.

The lateral displacement was correctly measured as:

To determine the focal length of a concave mirror by forming image of a distant object, the screen should be placed:

The control rods used in the reactor of a nuclear power plant are made of:

1. Steel.
2. Graphite.
3. Uranium.
4. Boron.

The figure given alongside shows the image of a clock as seen a plane mirror. The correct time is:
Figure.

1. 2.25
2. 2.35
3. 6.45
4. 9.25

In order to obtain a magnification of −2 (minus 2) with a concave mirror, the object should be placed:

1. Between pole and focus.
2. Between focus and centre of curvature.
3. At the centre of curvature.
4. Beyond the centre of curvature.

Mark the incorrect statement:

The SI unit of energy is:

1. Joule.
2. Coulomb.
3. Watt.
4. Ohm-metre.

The refractive index of water is:

If an object is placed 21cm from a converging lens, the image formed is slightly smaller than the object. If the object is placed 19cm from the lens, the image formed is slightly larger than object. The approximate focal length of the lens is:

1. 5cm
2. 10cm
3. 18cm
4. 20cm

A student is observing the diagram showing the path of a ray of light passing through a glass prism. He would find that for all angles of incidence the ray of light bends: