Question

Match the following:
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ 1.\text{Soldiers in a march past}& A)\text{Periodic Motion}\\ 2.\text{A mark made on the blade of a rotating fan after switching off}& B)\text{Circular Motion}\\ 3.\text{Motion of a swing}& C)\text{Rectilinear Motion}\end{array}$

Select the appropriate option.

• A. 1 - C, 2 - A, 3 - B
• B. 1 - C, 2 - B, 3 - A
• C. 1 - A, 2 - B, 3 - C
• D. 1 - B, 2 - A, 3 - C

Answer 1

The correct option is B

1 - C, 2 - B, 3 - A

- Soldiers in a march past represent the rectilinear motion as it is a translatory motion in a straight line.
- A mark made on the blade of rotating fan represents circular motion as the point moves on a circular path with a fixed radius. Since the fan is switched off, the speed gradually reduces and therefore, it does not cross a particular point in equal intervals of time. Hence it cannot be periodic.
-The motion of a swing represents periodic motion as it crosses the mean position at constant intervals of time.