Light – Reflection and Refraction — Science STD 10 — Question

While performing the experiment to trace the path of a ray of light passing through a glass prism, four students marked the incident ray and the emergent ray in their diagrams in the manner shown below:

If the potential difference between the ends of a fixed resistor is halved, the electric power will become:

In the following circuits (Figure), heat produced in the resistor or combination of resistors connected to a 12V battery will be:

The refractive indices of four media A, B, C and D are 1.44, 1.52, 1.65 and 1.36 respectively. When light travelling in air is incident in these media at equal angles, the angle of refraction will be the minimum:

1. In medium A.
2. In medium B.
3. In medium C.
4. In medium D.

The image of an object formed by a plane mirror is:

When the switch S is closed in the figure given below, the pointer of the galvanometer moves to the right.

If S is kept closed, will the pointer:

A beam of parallel light rays is incident through the holes on one side of a box and emerges out through the holes on its opposite side as shown in the diagram below:

Which of the following could be inside the box?

Which of the following is not caused by the atmospheric refraction of light?

1. Twinkling of stars at night.
2. Sun appearing higher in the sky than it actually is.
3. Sun becoming visible two minutes before actual sunrise.
4. Sun appearing red at sunset.

The front face of a circular wire carrying current behaves like a north pole. The direction of current in this face of circular wire is:

1. Clockwise.
2. Downwards.
3. Anticlockwise.
4. Upwards.