Question

Techniques used for determination of orientation in fibres from amongst the followings are
P. Birefringence measurement
Q. Scanning electron microscopy
R. X-ray diffraction
S. Differential scanning calorimetry

• A. P and Q
• B. P and R
• C. Q and R
• D. Q and S

Hint:

Birefringence and X-ray diffraction are key techniques for studying the molecular alignment and crystalline structure in fibres, which are important for their mechanical properties.

Answer 1

The Correct Option is B

- Birefringence measurement (P) and X-ray diffraction (R) are both common techniques used for determining the orientation of fibres. Birefringence is related to the alignment of polymer chains, and X-ray diffraction provides information about the crystalline structure, which is crucial for understanding orientation. - Scanning electron microscopy (Q) and Differential scanning calorimetry (S) are useful for studying the surface and thermal properties of fibres but are not typically used for determining fibre orientation. Final Answer: \[ \boxed{\text{P and R}}. \]