Identify the wrong pair with respect to different motions and their examples.

Rectilinear motion - A stone thrown up in the air at an angle

The correct answer is option 2. Rectilinear motion - A stone thrown up in the air at an angle.

The wrong pair with respect to different motions and their examples is Rectilinear motion - A stone thrown up in the air at an angle.

Rectilinear motion, also known as linear motion, refers to motion along a straight line, where an object moves in a straight path.

When a stone is thrown up in the air at an angle, its motion is parabolic rather than strictly rectilinear. The stone follows a curved trajectory under the influence of gravity, so it is not a perfect example of rectilinear motion.

The other pairs are correctly matched:

Periodic motion - Earth rotating on its axis: Earth's rotation around its axis results in periodic motion, as it completes one full rotation approximately every 24 hours, leading to the alternation of day and night.

Rotational motion - Blades of a windmill: The blades of a windmill rotate around a central axis, demonstrating rotational motion as they turn in response to wind energy.

Oscillatory motion - A boat tossing up and down a river: When a boat moves up and down repeatedly due to the waves on a river, it exhibits oscillatory motion, with the boat's position varying periodically about a central point.