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:

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. 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:

a) Head to tail rule

b)

**Right hand rule**

c) Left hand rule

d) Triangular rule

20. The direction of torque can be found by:

a) Head to tail rule

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

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