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Answer: B

Key insight
This is a Geneva drive (Maltese cross) mechanism. The drive wheel P has a pin that engages the slots of wheel Q only during part of each rotation. When the pin is in a slot, Q rotates; when the pin is out, Q is locked. The motion of Q is therefore intermittent (not continuous) and in one direction only.

Step by step
Step 1: Identify the mechanism — wheel P (circular with a pin/cam) drives wheel Q (star/cross shaped with slots), which is a Geneva drive.
Step 2: As P rotates clockwise, the pin engages one slot of Q and pushes Q to rotate anti-clockwise during that engagement.
Step 3: Once the pin exits the slot, Q is held stationary by the circular locking portion of P until the pin enters the next slot.
Step 4: Q therefore moves intermittently (only when the pin is engaged) and always in the same direction (anti-clockwise, since P is clockwise).
Step 5: "Intermittently anti-clockwise" = Option B.
Therefore the answer is B.

Why wrong options are wrong
Option A: Continuously anti-clockwise — wrong because Q is stationary when the pin is not engaged.
Opti

In the figure shown below, the drive wheel P engages with the driven wheel Q through a pin marked in red. Which of the options describes the movement of Q, when P moves in the clockwise direction?