Physics MCQs

Physics

Vectors and Equilibrium


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#97

The dot product of $\vec{A} = 2\hat{i} + 3\hat{j} + \hat{k}$ and $\vec{B} = \hat{i} - \hat{j} - \hat{k}$ is:

A) 2

B) -2

C) -1

D) -3

Answer:   B
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#98

A vector whose magnitude is one is called a:

A) Null vector

B) Unit vector

C) Position vector

D) Resultant vector

Answer:   B
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#99

Which of the following is not a property of a vector?

A) It has a magnitude

B) It has a direction

C) It can be multiplied by a scalar

D) It can be divided by a scalar

Answer:   D
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#100

The number of rectangular components of a vector in 3D is:

A) 1

B) 2

C) 3

D) 4

Answer:   C
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#101

The scalar product of a vector with a null vector is:

A) The magnitude of the vector

B) Zero

C) A null vector

D) Unity

Answer:   B
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#102

The cross product of a vector with a null vector is:

A) Zero

B) A null vector

C) The magnitude of the vector

D) Unity

Answer:   B
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#103

If $\vec{A} \times \vec{B} = -\vec{B} \times \vec{A}$, this property is called:

A) Commutative

B) Associative

C) Anti-commutative

D) Distributive

Answer:   C
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#104

The center of gravity of a body is the point where the entire weight of the body is considered to be acting:

A) Horizontally

B) Vertically downwards

C) Vertically upwards

D) At any angle

Answer:   B
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