**841. What is the angle that the given vector makes with y-axis and A=2i+3j?**

A. 30°

**B. 60°**

C. 90°

D. 120°

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

A. 1st

B. 2nd

**C. Both 1st and 3rd**

D. 4th

**843. Two vectors A and B are making angle θ 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.cosθ

D. Both a and b are correct

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

A. B is anti-parallel to A

**B. B is a negative vector of A**

C. B has a negative magnitude

D. B is perpendicular to A

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

**A. A.B = A^ B^**

B. |A| = |B|

C. |A^| = |B^|

D. AB^ = BA^

**846. I ^. (j^ x k^) is equal to**

**A. 1**

B. i^

C. j^

D. k^

**847. Which one is not a correct relation?**

A. AxB = -BxA

**B. |AxB| = -|BxA|**

C. AxB = AB Sinθn^

D. BxA = AB Sinθ(-n^)

**848. The direction of the vector product is given by**

A. Head to tail rule

**B. Right-hand rule**

C. Left-hand rule

D. Triangular rule

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

A. West

B. North

**C. Down**

D. Up

**850. 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