VECTORS 31. The minimom number of forces of oqual agnitude in a plane that can keep a particle in equilibriun 3)3 4) 5 2) 2 1)4 . De minimum mumber of non coplanar forces that can keep a particle in equitibrium is 4) 4 2) 2 3) 3 33. Which of the following sets of forces acting simultaneously on a particle keep it in equilibriun 3) 2N, 6N, SN 4) 5N, 8N, IN 2) 4N, 7N, 12N 10 ) 3N, SN, 1ON 14. Which of the following units could be associated with a scalar quantity 7 I)N 2) kg ms 3) kg m's 4) rad s EXERCISE-II Resolution of vectors 1. f component of one vector in the direction of another vector is zero, then those two vectors 2) are perpendicular to each other. 4) are coplanar vectors. 1) are parallel to each other 3) are opposite to each other 2. The rectangular component of a vector is 1) always less than its magnitude 3) always equal to its magnitude 2) always greater than its magnitude 4) Less than or equal to its magnitude 3. The horizontal component of the weight of a body of mass m is 1) mg mg 3) Zero 4) Infinity What are the maximum number of rectangular components of a vector can be split in space and in plane respectively. 1) 3,2 4. 2) 3,3 3) 2,2 4) , 00 5. The projection of a vector =31+j+2k on the x-y plane has magnitude 1) 3 2) 4 3) V14 4) Vio 6. From figure the correct relation is 1)A+B+E=0 2) C-D--A 3) B+E-C-D P. 4) All of the above 7. Vector is 2 em long and is 60 above the x-axis in the first quadrant. Vector R is 2 cm long ana is 60 below the x-axis in the fourth quadrant. The sum + is a vector of magnitude 1) 2 cm along positive y-axis 3) 2 cm along negative y-axis 2) 2 cm along positive x-axis 4) 2 cm along negative x-axis 8 If -3i+4 and ai-j the vector having the same magnitude as that of b and parallel to a 1) 48 3) 5(i-) 4) s(i +)