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Physics Class 11 - Chapter 2
Vectors And EquilibriumTest - 3
1.
Null vector is a vector which has?
a) Both are satisfied
b) None of these
c) No specified direction
d) Zero magnitude
2.
If east, west, north, south, up and down representing the direction of unit vectors, then east x south has direction?
a) East
b) Up
c) West
d) Down
3.
SI unit of torque is?
a) None of these
b) Newton
c) Joul
d) N.m
4.
The magnitude of cross product is equal to the dot product at the angle of?
a) 60
b) 45
c) 90
d) 30
5.
Torque can be defined as?
a) Product of force and moment arm
b) Cross product of position vector and force
c) Turning effect of a force
d) All of these
6.
Angle between two vectors A and B can be determined by?
a) Left hand rule
b) Their dot product
c) Their cross product
d) Right hand rule
7.
Torque actually calculates?
a) Angular acceleration
b) Velocity of a body
c) Direction of a body
d) Linear acceleration
8.
Which one is correct about A & B?
a) AxB=-ABcos
b) AxB=BxA
c) AxB=ABcos
d) AxB=-BxA
9.
The dimension of torque is?
a) [MLT
-1
]
b) None of these
c) [ML
2
T
-1
]
d) [ML
2
T
-2
]
10.
The direction of vector product is given by?
a) Rectangular rule
b) Left hand rule
c) Head to tail rule
d) Right hand rule
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