NEET UG PHYSICS MCQ: MOTION IN PLANE

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Understanding +4 | -1

What happens, when we multiply a vector by -2 ?

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Correct option: B

Direction reverses and magnitude is doubled

Option B (Direction reverses and magnitude is doubled) is correct because multiplying a vector by a negative scalar reverses its direction, and multiplying by the absolute value of the scalar (2) doubles its magnitude.

More Questions from MOTION IN PLANE

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Acceleration due to gravity: The magnitudes of the two vectors

\mathrm{\vec a}\,and\,\mathrm{\vec b}

are a and b respectively. The vector product of

\mathrm{\vec a}\,and\,\mathrm{\vec b}

cannot be If

\overrightarrow P \,\,.\,\,\overrightarrow Q = 0\,and\,\overrightarrow P \,\, \times \,\,\overrightarrow Q = 0

, then the angle between

\overrightarrow Q \,and\,\overrightarrow R

is Which of the following is not true? If

\vec{A}=3 \hat{i}+4 \hat{j}

and

\vec{B}=6 \hat{i}+8 \hat{j}

where

A

and

B

are the magnitudes of

\overrightarrow{\mathrm{A}}

and

\overrightarrow{\mathrm{B}}

The wind appears to blow from the north to a man moving in the north-east direction. When he doubles his velocity the wind appears to move in the direction

{\cot ^{ - 1}}\left( 2 \right)

east of north. The actual direction of the wind is The resultant of two forces, each P, acting at an angle

\theta