Multiple choice questions of Chapter 2 of Physics for First Year.

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:

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

9. 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

10. When two vectors are anti-parallel, the angle
between them is:
a) Zero
b) 180°
c) 90°
d) 270°

11. 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

12. 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

13. 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

14. Vectors A is along y axis, its component along x
axis is:
a) A
b) A/2
c) Zero
d) 2A

15. The angle between rectangular components of vector
is:
a) 45°
b) 60°
c) 90°
d) 180°

16. 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

17. Dot product of two non-zero vectors is zero, when
angle between them is:
a) 0
b) 30
c) 45
d) 90

18. The scalar product of two vectors is maximum when
they are:
a) Parallel
b) Perpendicular
c) Anti-parallel

19. The direction of vector product is given by:
b) Right hand rule
c) Left hand rule
d) Triangular rule

20. The direction of torque can be found by:
b) Right hand rule
c) Left hand rule
d) Fleming rule

21. 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°

22. 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

23. The magnitude of a vector can never be:
a) Positive
b) Negative
c) Positive and negative
d) None of these

24. The minimum number of unequal forces whose
resultant will be zero:
a) 2
b) 3
c) 4
d) 5

25. 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

26. SI unit of torque is:
a) Nm-1
b) Nm
c) Nm-2
d) None

27. 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
28. If a body is at rest, then it will be in
a) Static equilibrium
b) Dynamic equilibrium
c) Translational equilibrium
d) Unstable equilibrium
29. The magnitudes of rectangular component are equal
if its angle with x-axis is:
a) 45°
b) 90°
c) 30°
d) 0°
30. 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
31. 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