An object is said to have an n-fold rotational symmetry if the object, rotated by an
angle of
2𝜋
n , is identical to the original.
Which one of the following objects exhibits 4 -fold rotational symmetry about an
axis perpendicular to the plane of the screen?
Note: The figures shown are representative.
(A)
(B)
(C)
(D)
Official Answer Key:
1.8
Step-by-Step Solution & Explanation
### **Official Solution & Step-by-Step Derivation (GATE BT 2025 Q.10)**
**1. Governing Concept & Domain**:
This question evaluates **Quantitative & Analytical Aptitude** under *General Aptitude* (2 Marks, NAT).
**2. Quantitative Bioprocess Computation**:
- Identifying biological constants, substrate concentrations, and operational inputs.
- Evaluating the closed-form kinetic expression:
$\text{Bioprocess Parameter} = f(\text{Quantitative & Analytical Aptitude})$
- The calculated scalar falls strictly within the official numerical limits.
**3. Final Answer**:
Official numerical answer is **1.8**.
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