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WORK SHEET -1 ;PHYSICS CLASS 11


               CHAPTER -4; TOPIC -MOTION IN A PLANE


               SUB TOPIC - SCALAR AND VECTORS

               Fill in the blanks


               1  If the magnitude of resultant vector is equal to sum of the magnitudes of the two vectors and its
                  direction is same as that of two given vectors,than the angle between the vectors is
                  ---------------------.
               2  The unit vector is a unit --------   quantity.
               3  The magnitude of resultant vector cannot exceed ----------- of the magnitudes of  vectors.
               4  If a vector makes angle α and β with X-axis and Y-axis respectively, then the rectangular
                  components of the vector are ---------  and  ----------.
               5  Two vectors are perpendicular to each other if their ---------- product is zero.



               Multiple Choice Questions

               6  A particle is given a displacement of 4m in the x - y plane. If the x component of displacement vector
                   is 2m, then y component is

                   a)2m  b)2√2m         c)2√3m                d)4m

               7  Two forces of magnitude 3N and 4N are acting at a point. Than the angle made by resultant
                   with each force will be
                      a)  More with 3N force                                b) Less with 3N force
                      b)  Cannot determined                            d) Make equal angles with both 3N and 4N
               8  If three vectors are represented by 3sides of anequilateral triangle taken in same order,
                   than the resultant is
                      a)  zero                            b) sum of the magnitude of the three vectors
                      c)  magnitude is equal to the third side    d) none of these




               9. Define position vector and displacement vector. A body initially located at
               P(1,-3,2) moved to a point Q(-5,-2,1). Find position vectors of points P and Q also the displacement
               vector for the transition from P to Q.

                                                                       ̂
               10. Two vectors A and B in x-y plane are given by A =       ̂ +       and
                          ̂
               B=       ̂+       then find the vector representing the sum of the two vectors.
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