GATE CSE 2023 | GA | Question: 10

Question

Which one of the options best describes the transformation of the $2$-dimensional figure $\mathbf{P}$ to $\mathbf{Q}$, and then to $\mathbf{R}$, as shown?

• A. $\text{Operation 1:}$ A clockwise rotation by $90^{\circ}$ about an axis perpendicular to the plane of the figure
  $\text{Operation 2:}$ A reflection along a horizontal line
• B. $\text{Operation 1:}$ A counter clockwise rotation by $90^{\circ}$ about an axis perpendicular to the plane of the figure
  $\text{Operation 2:}$ A reflection along a horizontal line
• C. $\text{Operation 1:}$ A clockwise rotation by $90^{\circ}$ about an axis perpendicular to the plane of the figure
  $\text{Operation 2:}$ A reflection along a vertical line
• D. $\text{Operation 1:}$ A counter clockwise rotation by $180^{\circ}$ about an axis perpendicular to the plane of the figure
  $\text{Operation 2:}$ A reflection along a vertical line

Comments

for the guys getting stuck in 2nd q to r
remember horizontal reflection as image is getting shifted from Left <-> right and for vertical reflection it is getting shift up<->down

Answer 1

If we observed image $P\rightarrow Q$ as operation $1$ it will rotate $90^\circ$ in a clockwise direction. so Option $B,D$ is eliminated.

From the image, $Q\rightarrow R$ as operation $2$ it is a reflective image based on a horizontal line. so option $C$ is also eliminated.

$\therefore$ Option $(A)$ is correct.

Answer 2

If seeing this question on mobile screen, do auto-rotation off.

Rotate phone clockwise wise at 90°, Figure P will become same as Figure Q.

Now put mirror horizontally on top of Figure Q, reflection on mirror same as Figure R

Answer: A)

Comments

It's possible to rotate our heads tho 😁

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Very Funny comments guys had a great laugh...

#keep_joking

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at the end if enough time exists , cut / make a paper of that shape and apply all options  :-)

Answer 3

Video solution available.

https://www.youtube.com/watch?v=k-Ou7_mRTW8&ab_channel=MonalisaCS

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