Vectors And Equilibrium

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          Vectors And Equilibrium


31.  Three coplanar forces acting on a body keep it in equilibrium. They should therefore be
A. concurrentB. non concurrent
C. parallelD. non parallel
32.  which of the following pairs does not have identical dimensions ?
A. torque and energyB. momentum and impulse
C. energy and workD. mass and moment of inertia
33.  A central force is that which
A. can produce torqueB. can not produce torque
C. some time can produce torque some time can not D. has no relation with torque
34.  It is easier to turn a steering wheel with both hands than with a single hand because
A. accelerating force increases on the wheelB. two forces act on the wheel
C. two hands provide firm gripD. couple acts on the wheel
35.  The cross product i^ x j^ is equal to
A. zeroB. one
C. i^D. k^

36.  ? The unit vector in the direction of vector A = 2 i^ -2j^ + k^ is
A. 2i^ - 2j^ + k^B. (2i^ - 2j^ +k^)/9
C. (2i^ - 2j^ +k^)/3D. (2i^ - 2j^ +k^)/5
37.  The magnitude of i^. (j^ x k^) is
A. 0B. 1
C. -1D. i^

38.  In which quadrant, only value of tan will be positive?
A. firstB. second
C. thirdD. both 1st and 3rd

39.  ? ? If A=Ax i^ + Ay j^ + Az K^ B = Bx i^ + By j^ + Bz K^ then
A. ?? A. B = Ax Bx + Ay By + Az BzB. ?? A. B = Ax By + Ay Bz + Az By
C. ?? A. B = Ay Bz + Az By + Az BxD. ?? A. B = Ax Bz + Ay By + Az Bx
40.  The cross product of two vectors is a negative vector when
A. they are parallel vectorsB. they are anti parallel vectors
C. they are perpendicular vectorD. they are rotated through 270?

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