Which one is odd man out?

Options

A. A car taking turn on a curved road
B. Motion of a swing
C. Motion of needle end of a sewing maching
D. Motion of an engine piston

Explanation

To determine which one is the odd one out among the given options, we need to analyze the type of motion each option describes:

1. **Motion of a Car Taking a Turn on a Curved Road**:
- This motion is known as **curvilinear motion**. The car moves along a curved path, which is not a straight line.

2. **Motion of a Swimmer**:
- The motion of a swimmer can be described as **periodic motion**. The swimmer moves forward and backward in a repetitive manner, returning to a similar position after a certain time.

3. **Motion of a Needle in a Sewing Machine**:
- The needle of a sewing machine also exhibits **periodic motion**. It moves up and down repeatedly, returning to its initial position after each cycle.

4. **Motion of an Engine Piston**:
- The motion of an engine piston is characterized by **reciprocating motion**. The piston moves up and down in a straight line, which is different from the other types of motion described.

### Conclusion:
The odd one out is the **motion of an engine piston** because it exhibits reciprocating motion, while the other three options (car, swimmer, and sewing machine needle) exhibit periodic or curvilinear motion.

### Step-by-Step Solution:
1. Identify the type of motion for each option.
2. Analyze the motion of the car, swimmer, sewing machine needle, and engine piston.
3. Compare the types of motion.
4. Determine which motion is different from the others.
5. Conclude that the motion of the engine piston is the odd one out.