GATE CH 2023 | GA | Question: 5

Question

A line of symmetry is defined as a line that divides a figure into two parts in a way such that each part is a mirror image of the other part about that line.

The given figure consists of $16$ unit squares arranged as shown. In addition to the three black squares, what is the minimum number of squares that must be coloured black, such that both $\text{PQ}$ and $\text{MN}$ form lines of symmetry? (The figure is representative)

• A. $3$
• B. $4$
• C. $5$
• D. $6$

Answer 1

Answer is 5.

Comments

@mili_dhara can u plz explain it bit more not getting how these will be mirror image ..

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if we fold the figure around the mirror, all colored boxes should coincide.

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oh got it bt u should use black color instead of red for not any confusion btw thnx :)

Answer 2

Answer: C (5)