Vectors And Equilibrium

11.

What is the angle that the given vector makes with y-axis? A=2 i^+??12 j^

A.	30?	B.	60?
C.	90?	D.	120?

12.

In which quadrant the two rectangular components of a vector have same sign?

A.	1st	B.	2nd
C.	both 1st and 3rd	D.	4th

13.

Two vectors A and B are making angle ? with each other. The scalar projection of vector B on vector A is written as

A.	A.B/A	B.	A.B/B
C.	A.cos ?	D.	both a and b are correct

14.

Two vectors are A = 3i^+2j^ -k^& B = 3i^-2j^ +k^ , then

A.	B is anti parallel to A	B.	B is negative vector of A
C.	B has negative magnitude	D.	B is perpendicular to A

15.

If A=B, which of the following is not correct?

A.	A.B = A^ B^	B.	\|A\| = \|B\|
C.	\|A^\| = \|B^\|	D.	AB^ = BA^

16.

i^ . (j^ x k^) is equal to

A.	1	B.	i^
C.	j^	D.	k^

17.

Which one is not a correct relation?

A.	AxB = -BxA	B.	\|AxB\| = -\|BxA\|
C.	AxB = AB Sin?n^	D.	BxA = AB Sin?(-n^)

18.

The direction of vector product is given by

A.	head to tail rule	B.	right hand rule
C.	left hand rule	D.	triangular rule

19.

If east, west, north, south, up and down are representing the direction of unit vectors, then east x south has direction along

A.	west	B.	north
C.	down	D.	up

20.

Null vector is a vector which has

A.	zero magnitude	B.	no specified direction
C.	both a and b are correct	D.	both a and b are not correct

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