Question

The direction cosines of Y-axis are:

• A. 0, 1, 0
• B. 1, 0, 0
• C. 1, 1, 1
• D. 0, 0, 1

Answer 1

The correct option is A

0, 1, 0

The Y-axis makes angles 90^o, 0^o and 90^o with the positive directions of X-axis, Y-axis and Z-axis, respectively, then cos 90^o = 0, cos 0^o = 1, cos 90^o = 0 are the directions cosines of the line.