Multiple Choice Questions Chapter 2 Vectors and Equilibrium l First Year Physics Federal Board KPK

Описание: Two vectors lie with their tails at the same point. When the angle between them is increased by 20o their scalar product has the same magnitude but changes from positive to negative. The original angle between them was:
A. 0 B. 60o C. 70o D. 80o
The minimum number of vectors of unequal magnitude required to produce a zero resultant is
A. 2 B. 3 C. 4 D. 5
If the resultant of two vectors, each of magnitude A is also a magnitude of A. the angle between the two vectors will be:
A. 30o B. 45o C. 60o D. 120o
The magnitude of vector A=2i ̂+j ̂+2k ̂ is
A. 9 B. 5 C. 3 D. 1
When Fx = 3 N and F= 5 N then Fy=
A. 6 N B. 4 N C. 2 N D. 0 N
A meter stick is supported by a knife-edge at the 50-cm mark. Arif hangs masses of 0.40 kg and 0.60 kg from the 20-cm and 80-cm marks, respectively. Where should Arif hang a third mass of 0.30 kg to keep the stick balanced?
A. 20 cm B. 70 cm C. 30 cm D. 25 cm
If Ax = 1.5 cm, Ay = –1.0 cm, into which quadrant do the vector A point?
A. I B. II C. III D. IV
A ⃗ · (A ⃗ × B ⃗) = ?
A. 0 B. 1 C.AB D.A2B
Two forces of magnitude 20 N and 50 N act simultaneously on a body. Which one of the following forces cannot be a resultant of the two forces?
A. 20 N B. 30 N C. 40 N D. 70 N
If the dot product of two nonzero vectors A and B is zero then the magnitude of their cross product is __
A. 0 B. 1 C. AB D. –AB
The sum of magnitudes of two forces is 16N. If the resultant force is 8N and its direction is perpendicular to minimum force then the forces are
A. 6N and 10N  B. 8N and 8N C. 4N and 12N D. 2N and 14N
Find the mass of the uneven rod shown in the figure. If its center of gravity is 14 cm from end A is ____
A. 100 g

B. 150 g

C. 80 g

D. 5 g

The following diagrams show a uniform rod with its midpoint on the pivot. Two equal forces F are applied on the rod, as shown in the Figure. Which diagram shows the rod in equilibrium?






For which angle the equation |A ⃗.B ⃗ |=|A ⃗.B| is correct.
A. 30o B. 45o C. 60o D. 90o
What is the net torque on wheel radius 2 m as shown?
A. 10 N anticlockwise

B. 10 Nm anticlockwise

C. 10 Nm clockwise

D. 5 Nm clockwise