Q2.Position vectors of points A, B, C, etc., with respect to the origin O are generally denoted by
Answer : Option BExplaination / Solution: Position vectors of any point in space are usually calculated from the origin, so we write OA−→−,OB−→−,OC−→− three points A ,B,C in space to represent the origin as the initial point.
Answer : Option CExplaination / Solution: the angles α,β,γare called direction angles, which the position vector r→makes with the positive x-axis ,y-axis and z-axis respectively
Q5.If l, m and n are direction cosines of the position vector OP the coordinates of P are
Answer : Option AExplaination / Solution: If l , m and n are the direction cosines of vector r→denoted by OP−→− , then , the coordinates of point P are given by : lr ,mr and nr respectively.
Answer : Option CExplaination / Solution:
A vector whose initial and terminal points coincides is called Zero Vector. The magnitude of Zero Vector is also Zero.
Answer : Option CExplaination / Solution:
Two vectors A and B are said to be collinear , if they are parallel to the same line irrespective of their magnitudes and directions.
Total Question/Mark :
Scored Mark :
Mark for Correct Answer : 1
Mark for Wrong Answer : -0.5
Mark for Left Answer : 0