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Physics 1st year MCQs
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Chapter 2 Vectors and Equilibrium
1. Which one is a vector:
a) Length
b) Volume
c) Velocity
d) Work
2. An example of scalar quantity is
a) Displacement
b) Speed
c) Velocity
d) Torque
3. Name the quantity which is vector:
a) Density
b) Power
c) Charge
d) Moment of Force
4. Rectangular coordinate system is also called:
a) Polar coordinate system
b) Cartesian coordinate system
c) Cylindrical coordinate system
d) Space coordinate system
5. The direction of a vector in space is specified by:
a) One angle
b) Two angle
c) Three angle
d) No angle
6. If both components of a vector are negative, then resultant lies in:
a) 1st quadrant
b) 2nd quadrant
c) 3rd quadrant
d) 4th quadrant
7. In which quadrant the two rectangular components of a vector have same sign?
a) 1st
b) 2nd
c) both 1st and 3rd
d) 4th
8. If the x-component of a vector is positive and y-component is negative, then resultant vector lies in what quadrant:
a) 1st quadrant
b) 2nd quadrant
c) 3rd quadrant
d) 4th quadrant
9. If vector A lies in the third quadrant, its direction will be:
a) 180 −
b) 360 −
c) 180 +
d) none
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
11. When two vectors are anti-parallel, the angle between them is:
a) Zero
b) 180°
c) 90°
d) 270°
12. The resultant of two forces 30 N and 40 N acting at an angle of 90° with each other is
a) 30 N
b) 40 N
c) 50 N
d) 70 N
14. If 6N force act at right angle to 8N force, then the magnitude of resultant will be:
a) 6N
b) 8N
c) 10N
d) 14N
15. If A + B = B + A, this shows that addition of vectors is
a) Associative
b) Commutative
c) Additive
d) Additive inverse
16. A body is in dynamic equilibrium only when it is
a) At rest
b) Moving with a variable velocity
c) Moving with uniform acceleration
d) Moving with uniform velocity
22. Vectors A is along y axis, its component along x axis is:
a) A
b) A/2
c) Zero
d) 2A
a) 45°
b) 60°
c) 90°
d) 180°
24. 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
a) 0
b) 30
c) 45
d) 90
31. The scalar product of two vectors is maximum when they are:
a) Parallel
b) Perpendicular
c) Anti-parallel
43. If the position ̅and force are in same direction, then torque will be:
a) Maximum
b) Minimum
c) Same
d) Negative
a) Head to tail rule
b) Right hand rule
c) Left hand rule
d) Fleming rule
45. At what angle, the two vectors of the same magnitude have to oriented, if they were to be combined to give a resultant equal to a vector of same magnitude?
a) 45°
b) 90°
c) 120°
d) 180°
46. If the line of action of force passes through axis of rotation or the origin, then its torque is:
a) Maximum
b) Unity
c) Zero
d) None of these
47. The magnitude of a vector can never be:
a) Positive
b) Negative
c) Positive and negative
d) None of these
48. The minimum number of unequal forces whose resultant will be zero:
a) 2
b) 3
c) 4
d) 5
49. Torque is defined as.
a) Turning effect of force
b) Cross product of force and position vector
c) Product of force and moment arm
d) All a, b and c are correct
50. SI unit of torque is:
a) Nm-1
b) Nm
c) Nm-2
d) None
51. A body will be in complete equilibrium when it is satisfying:
a) 1st condition of equilibrium
b) 2nd condition of equilibrium
c) Both 1st and 2nd condition of equilibrium
d) Impossible
53. If a body is at rest, then it will be in
a) Static equilibrium
b) Dynamic equilibrium
c) Translational equilibrium
d) Unstable equilibrium
54. The magnitudes of rectangular component are equal if its angle with x-axis is:
a) 45°
b) 90°
c) 30°
d) 0°
56. The resultant of two forces of equal magnitudes is also equal to
the magnitude of the forces. The angle between the two forces is.
a) 30o
b) 60 o
c) 90 o
d) 120 o
57. The magnitude of dot and cross product of two vectors are 6√3 and 6 respectively. The angle between them will be
a) 0°
b) 30°
c) 45°
d) 60°
a) Zero
b) 45°
c) 90°
d) 180°
59. Two vectors to be combined have magnitudes 60 N and 35 N. The correct answer for the magnitude of their resultant will be:
a) 15 N
b) 20 N
c) 70 N
d) 100 N
Answer key
