Match each material in Group I with a bond type in Group II.

Group I	Group II
P. Silicon	1. Metallic bonding
Q. Copper	2. Covalant bonding
R. Sodium chloride	3. Ionic bonding
	4. Vander-Wallis bonding

A. decreases B. increases C. remains constant D. shows no systematic variation

A. Burger vector and the dislocation line are Parallel to each other for screw dislocations B. Burger vector and the dislocation line are perpendicular to each other for edge dislocations C. Screw dislocations glide parallel to its Burger vector D. Edge dislocations glide parallel to its Burger Vector

A. 210 B. 220 C. 222 D. 310

A. 18110 B. 18300 C. 19360 D. 19890