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


7.
Vector addition obeys the commutative law. This means:
A.
A + B = A - B
B.
A + B = B + A
C.
(A+B)+C = A+(B+C)
D.
A + B = 2A
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ANSWER :
B. A + B = B + A
8.
Two vectors of magnitudes 3 and 4 units are perpendicular to each other. The magnitude of their resultant is:
A.
7 units
B.
1 unit
C.
5 units
D.
12 units
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ANSWER :
C. 5 units
9.
The cross product of two parallel vectors is:

NEET - 2018

A.
Zero vector
B.
A scalar
C.
A vector perpendicular to both
D.
Undefined
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ANSWER :
A. Zero vector
10.
Two vectors of magnitudes 5 and 3 units. The maximum and minimum values of their resultant are:
A.
8 and 2
B.
15 and 0
C.
8 and 0
D.
5 and 3
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ANSWER :
A. 8 and 2
11.
The subtraction A - B is defined as:
A.
The difference of magnitudes (A-B)
B.
A + B
C.
A + (-B)
D.
(-A) + B
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ANSWER :
C. A + (-B)
12.
In the parallelogram law of vector addition, the resultant R of vectors A and B is represented by:
A.
Either side of the parallelogram
B.
The shorter diagonal
C.
The longer diagonal
D.
The diagonal from the common tail
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ANSWER :
D. The diagonal from the common tail