NIMCET 2010 — Reasoning PYQ

1. Analyze the Rotation:

• The standard cardinal and ordinal directions are separated by $45^{\circ }$ each.

• The original direction is North-East (NE).

• The new direction is South-East (SE).

• Moving from North-East to South-East involves a rotation of $90^{\circ }$ in the Clockwise (CW) direction.

2. Apply the $90^{\circ }$ Clockwise Rotation to the Options:

• Check Option (a): West to North

  • Original direction: West.

  • $90^{\circ }$ Clockwise from West is North.

  • Result: This matches the transformation.

• Check Option (b): South to South-West

  • Original direction: South.

  • $90^{\circ }$ Clockwise from South is West (not South-West).

  • Result: Incorrect.

• Check Option (c): North-West to East

  • Original direction: North-West.

  • $90^{\circ }$ Clockwise from North-West is North-East (not East).

  • Result: Incorrect.

• Check Option (d): East to South-West

  • Original direction: East.

  • $90^{\circ }$ Clockwise from East is South (not South-West).

  • Result: Incorrect.

Final Answer:

Since a $90^{\circ }$ clockwise rotation turns West into North, the correct change is described in option (a).

The correct option is (a).