Scalars & Vectors (Addition and Subtraction, Scalar and Vector Products, Unit Vector, Resolution of a Vector) NEET Questions

Physics - Kinematics

Scalars & Vectors (Addition and Subtraction, Scalar and Vector Products, Unit Vector, Resolution of a Vector) MCQ Questions


13.
Two vectors are perpendicular when their dot product is:

NEET - 2019

A.
Positive
B.
Negative
C.
Zero
D.
Undefined
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ANSWER :
C. Zero
14.
The direction of the vector product A × B is determined by:
A.
Right-hand rule
B.
Left-hand rule
C.
Dot product
D.
Cross product
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ANSWER :
A. Right-hand rule
15.
The magnitude of the vector product A × B is:
A.
AB cosθ
B.
AB sinθ
C.
AB
D.
2AB
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ANSWER :
B. AB sinθ
16.
The scalar product of two vectors A = 3i + 4j and B = 5i + 2j is:
A.
23
B.
26
C.
27
D.
32
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ANSWER :
B. 26
17.
The resolution of a vector in two perpendicular directions is:
A.
Always possible
B.
Not always possible
C.
Sometimes possible
D.
Impossible
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ANSWER :
A. Always possible
18.
The vector product A × B is a vector with magnitude
A.
AB cosθ
B.
AB sinθ
C.
AB
D.
1/AB
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ANSWER :
B. AB sinθ