engineering recuitment BHEL Engineer Trainee Mock Test 2025 Engineering Materials Science

In hexagonal crystal structure axial lengths (a, b and c) and angles (α , β and γ) are:

1
a = b ≠ c, α = β = 90°, γ = 120°
2
a = b = c, α = β = γ = 90°
3
a ≠ b ≠ c, α ≠ β ≠ γ
4
a ≠ b ≠ c, α = γ = 90°, β ≠ 90°
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