# Mathematics MCQS for class 12 with Answers Chapter 7

#### Mathematics MCQS for class 12 with Answers

If j & K are two unit vectors then jx k =
1
i
0
-1

Commutative law holds in
None of these
Inner product
Cross product in three vectors
Vector product

If a & b are vectors along two adjacent sides of a triangle then area of triangle is:
1/2 |a x b|
ab
|a. b|
a . b

The cross product or vector product of two vectors is defined
Only in plane
Only in space
None of these
Both a and c

i . (j x k) is equal to
1
2
-1
0

Two vectors are said to be negative of each other if they have _______ magnitude but _________ direction
None of these
Opposite, same
Same, same
Same, Opposite

The magnitude of vector is also called its
Norm
Parameter
Variables
Point

If the angle
Collinear
Perpendicular
Both(b)&(c)
Parallel

Work done of a force on a particle.
Zero
None of these
Scalar quantity
Vector quantity

The null or zero vector in R3 is O = ____________
None of these
[0,0]
[0,0,0]


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