Fill in the Blanks:
Any plane parallel to YZ-plane is perpendicular to …………..

Fill in the blanks : A person 1m in front of a plane mirror seems to be ……………… m from his image.

Fill in the blanks : A circle can have......... parallel tangents at the most.

The equation of yz-plane is equal to :

A dipole, with its charges, -q an +q, are located at the ponit (0,-b,0) and (0,+b,0), is present in uniform electric field E. the equipotential surfaces of this field are planes parallel to the YZ-planes. What is the direction of the electric field E?

Prove the theorem of perpendicular axes. (Hint: Square of the distance of a pint (x,y) in the x - y plane from an axis perpendicular to the plane through the origin is x^2 + y^2 )

Fill in the blanks: If k is any sclar and A is any matrix, then (k A)' = ………..

Fill in the blanks: If A is any square matrix then AA' is always n ……… matrix.

Fill in the blanks: If A is any square matrix then A-A' is always n ……… matrix.

The corner P of the square OPQR is folded up so that the plane OPQ is perpendicular to the plane OQR, find the angle between OP and QR.