Chapter 2 - Vectors and Equilibrium - 1

Chapter 2 - Vectors and Equilibrium - 1

1. Two forces act together on an object. The magnitude of their resultant is least when angle between them is:-

a) 60^o
b) 0^o
c) 180^o
d) 90^o

2. If vectors a and b are antiparallel to each other then their resultant is:-

a) a + b
b) 2a
c) a - b
d) 2b

3. If Ax is -ive and Ay is +ve the resultant is:-

a) 3rd
b) 4th
c) 2nd
d) Ist

4. If A x B = C paints along + z-axis then the vector A and B must lie in:-

a) y,z plane
b) x,y plane
c) -x,y plane
d) z,x plane

5. S.I. units for moment arm is:-

a) Kg.m/s²
b) None
c) Nm^-1
d) Nm

6. Dot product of A and B is:-

a) AB secq
b) AB cosq
c) AB coseq
d) AB sinq

7. Two vectors are at right angle to each other then A.B is:-

a) Zero
b) AB cosq
c) AB sinq
d) AB

8. Cross product of vecotrs A and B is along:-

a) perpendicular to the plane containing A and B
b) opposite to B
c) Along B
d) A

9. A x A is:-

a) A
b) Zero
c) A²
d) 2A

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