Question

Match List - I with List - II

List - I (Type of Joint)	Origin / Nature
A. Sheet joints	II. Residual
B. Extension joints	IV. Tensional
C. Columnar joints	I. Contractional
D. Conjugate joints	III. Compressional

 

• A. A-II, B-I, C-III, D-IV
• B. A-I, B-II, C-III, D-IV
• C. A-II, B-IV, C-I, D-III
• D. A-IV, B-III, C-II, D-I

Hint:

Sheet joints are related to unloading or residual stress, while columnar joints are related to contraction during cooling.

Answer 1

The Correct Option is C

Concept:
Joints are fractures in rocks along which there is no significant displacement. They may form due to residual stress, tension, contraction or compression.

Step 1: Match Sheet joints.
Sheet joints commonly develop due to unloading or release of residual stress. \[ A\rightarrow II \]

Step 2: Match Extension joints.
Extension joints form due to tensional stress. \[ B\rightarrow IV \]

Step 3: Match Columnar joints.
Columnar joints commonly develop due to contraction during cooling of lava or igneous bodies. \[ C\rightarrow I \]

Step 4: Match Conjugate joints.
Conjugate joints are commonly related to compressional stress conditions. \[ D\rightarrow III \] Therefore, the correct matching is: \[ A-II,\ B-IV,\ C-I,\ D-III \] \[ \therefore \text{Correct Answer is (C)} \]