Question

Electric drill, rolling ball, wheel of a moving car, the pendulum of a wall clock, spinning ball. Find the odd one out.

A. Pendulum of a wall clock
B. Electric drill
C. Wheel of a moving car
D. Spinning ball

Answer 1

Hint: There are different types of motion are based on the path travelled by the body/object - (circular, oscillatory and vibratory), the periodicity of the motion - (periodic and non-periodic) and the speed of the motion of object/body- (uniform and non -uniform motion).

Complete step by step answer:
The motion is the change in the position of the object/body with respect to the time.
From given, we have,
Linear motion – the motion along a linear path. The rectilinear motion is a type of linear motion.
Circular motion – the motion along a circular path. It is also called rotational motion.
Translational motion – a motion that involves spinning of the object which shifts from one point to the other.
Oscillatory or vibratory motion – a to and fro motion or motion involving the vibrations. It is also called the periodic motion.

In case of the pendulum of a wall clock, the pendulum moves to and fro.
The electric drill moves along a straight line along with the rotation.
The wheel of a moving car rotates and moves at a time.
A spinning ball spins and changes its position concerning time.

i) The pendulum of a wall clock. – The periodic motion
ii) The electric drill – The circular and translational motion
iii) The wheel of a moving car – The rectilinear and circular motion
iv) A spinning ball – The rotational and translational motion

As the pendulum of a wall clock exhibits only one motion, that is, the periodic motion, thus, the option (A) is correct.

Note:
The things to be on your finger-tips for further information on solving these types of problems are: The oscillatory motion is sometimes considered different from the vibration motion according to the situation. For example, in the case of plucking of a sitar string, the motion is considered to be vibration and not oscillatory.