H C Verma Solutions for Chapter: Physics and Mathematics, Exercise 2: OBJECTIVE I

A vector is not changed if

Which of the sets given below may represent the magnitudes of three vectors adding to zero?

The resultant of $\overrightarrow{A}$ and $\overrightarrow{B}$ makes an angle $\mathrm{\alpha }$ with $\overrightarrow{A}$ and $\mathrm{\beta }$ with $\overrightarrow{B}$, then

The component of a vector is

A vector $\overrightarrow{A}$ points vertically upward and $\overrightarrow{B}$ points towards north. The vector product $\overrightarrow{A}\times \overrightarrow{B}$ is

The radius of a circle is stated as $2.12 \mathrm{cm}$. Its area should be written as