Mark the correct alternative in each of the following:

The value of , where ,, is

Find , if and

Mark the correct alternative in each of the following:

If lies in the plane of vectors and , then which of the following is correct?

Mark the correct alternative in each of the following:

If , , are three non-coplanar mutually perpendicular unit vectors, then is

Mark the correct alternative in each of the following:

If for some non-zero vector , then the value of , is