A metal ball is whirled inside a ring placed on a table, as shown in the diagram P. The diagram Q shows the motion of the ball after the ring is lifted.

Which of the following diagrams shows the correct position of the metal ball in the ring when the ring is lifted?

Assertion (A): Sometimes the sky appears reddish in the evening.

Reason (R): Red, being longer in wavelength, scatter more than the other colours.

1. A and R are true, and R is the reason for A.
2. A and R are true, and R is not the reason for A.
3. A is true, but R is false.
4. A is false, but R is true.

Which of the following statement is CORRECT?

The frequency of a stretched string is:

1. directly proportional to its length but inversely proportional to the tension of the wire.
2. inversely proportional to its length but directly proportional to the tension of the wire.
3. directly proportional to the square root of its length but inversely proportional to the tension of the wire.
4. inversely proportional to its length but directly proportional to the square root of the tension of the wire.

A ray of light passes obliquely from an optical medium of refractive index 1.33 to another medium of refractive index 1.5. While passing from the first medium to the second, the light ray will:

1. bend towards the normal.
2. bend away from the normal.
3. move along the normal.
4. suffer total internal reflection.