Chap.2 Vectors and equilibrium MCQs with solution

 

1)	Which one is a vector: b) Length                            b) Volume c)  Velocity                        d) Work	C
2)	An example of scalar quantity is b) Displacement              b) Speed c)  Velocity                        d) Torque	B
3)	Name the quantity which is vector: b) Density                          b) Power c)  Charge                           d) Moment of Force	D
4)	Rectangular coordinate system is also called: b)  Polar coordinate system                      b) Cartesian coordinate system c)  Cylindrical coordinate system d) Space coordinate system	B
5)	The direction of a vector in space is specified by: b) One angle                      b) Two angle c)  Three angle                 d) No angle	C
6)	If both components of a vector are negative, then resultant lies in: b)  1st quadrant               b) 2nd quadrant c)  3rd quadrant              d) 4th quadrant	C
7)	In which quadrant the two rectangular components of a vector have same sign?  b) 1st                                    b) 2nd    c)  both 1st and 3rd         d) 4th	C
8)	If the x-component of a vector is positive and y-  component is negative, then resultant vector lies in what quadrant: b) 1st quadrant                b) 2nd quadrant c)  3rd quadrant              d) 4th quadrant	D
9)	If vector A lies in the third quadrant, its direction will be: a) 180 −                               b) 360 – c) 180 +                               d)none	C
10)	A single vector having the same effect as all the    original vectors taken together, is called a)Resultant vector         b) Equal vector                c)  Position vector          d) Unit vector	A
11)	When two vectors are anti-parallel, the angle    between them is: b) Zero                                 b) 180°                c)  90°                                  d) 270°	B
12)	The resultant of two forces 30 N and 40 N acting at    an angle of 90° with each other is b) 30 N                                 b) 40 N c)  50 N                                                d) 70 N	C
13)	If 6N force act at right angle to 8N force, then the    magnitude of resultant will be: b) 6N                                    b) 8N    c)  10N                                 d) 14N	C
14)	15. If , this shows that addition of    vectors is B)  Associative                 b) Commutative c)  Additive                        d) Additive inverse	B
15)	A body is in dynamic equilibrium only when it is b)  At rest                                                            b) Moving with a variable velocity c)  Moving with uniform acceleration  d) Moving with uniform velocity	D
16)	Mathematically, unit vector is described as: b)                          b. c)                                d)	C
17)	A unit vector is obtained by dividing a vector with: b)  Its direction                b) Its magnitude c)  Its magnitude and direction                d) None.	B
18)	The magnitude of a vector =Ax  –Ay b)   Ax2 + Ay2                                  b)  Ax2 - Ay2             c)                              d)	C
19)	Vectors A is along y axis, its component along x axis is: a)            A                              b) A/2 c) Zero                                 d) 2A	C
20)	The angle between rectangular components of vector    is: a) 45°                                   b) 60°   c) 90°                                   d) 180°	C
21)	A force of 10N is acting along x-axis, its component    along y-axis is     a) 10N                              b) 5N    c) 8.66N                              d) Zero N	D
22)	If vector  is acting along y-axis, its y-component is: a) A                                        b)cosθ  c)sinθ                                   d) Zero	A
23)	Dot product of two non-zero vectors is zero, when    angle between them is:     a) 0                                     b) 30    c) 45                                     d) 90	D
24)	The scalar product of two vectors is maximum when    they are:     a) Parallel                       b) Perpendicular c) Anti-parallel                 d) none	A
25)	Two vectors A and B are making angle θ with each    other. The projection of vector B on vector A is    written as. a) /A                             b) /B  c) cos θ               d) Both a and b are correct.	A
26)	The direction of vector product is given by:     a) Head to tail rule      b) Right hand rule     c) Left hand rule          d) Triangular rule	B
27)	Torque has zero value, if the angle between ̅ and    is     a) 0°                                  b) 90°   c) 270°                                 d) 180°	A
28)	The cross product of vectors will be minimum when the angle between vectors is b)  350                                                   b) 900     c)  00                                     d) 450	C
29)	The direction of torque is    a) Along position vector b) Parallel to the plane containing   and  c) Along force               d) Perpendicular to the plane containing      and	D
30)	If the position    and force  in the same direction     then torque will be:     a) Maximum                     b) Minimum  c) Same                                d) Negative	B
31)	The direction of torque can be found can be found by     a) Head to tail rule          b) Right hand rule c) Left hand rule                  d) Fleming rule	B