Isotropic or anisotropic solid

This type of question, asked 3 times: 2 May 2023 S2, 19 Apr 2025 S1, 14 May 2026 S2. All 3 questions below, oldest first.

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Question 1
2 May 2023 S2
73 $Which from following solids exhibits isotropic properties?$
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Question 2
19 Apr 2025 S1
67 $Which from following solids is isotropic?$
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Question 3
14 May 2026 S2
20 $Identify anisotropic substance from following.$
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