Work Energy And Power MCQs for NEET — Physics Questions with Answers

$\overrightarrow{\mathrm{A}}=\hat{\mathrm{i}}+\hat{\mathrm{j}}-\hat{\mathrm{k}} ; \overrightarrow{\mathrm{B}}=2\hat{\mathrm{i}}+3\hat{\mathrm{j}}+5\hat{\mathrm{k}}$ angle between $\overrightarrow{\mathrm{A}}$ and $\overrightarrow{\mathrm{B}}$ is

Given the vectors

$$\begin{gathered} \overrightarrow{\mathrm{A}}=2\hat{\mathrm{i}}+3\hat{\mathrm{j}}-\hat{\mathrm{k}} \\ \overrightarrow{\mathrm{B}}=3\hat{\mathrm{i}}-2\hat{\mathrm{j}}-2\hat{\mathrm{k}} \\ \& \overrightarrow{\mathrm{C}}=\mathrm{p}\hat{\mathrm{i}}+\mathrm{p}\hat{\mathrm{j}}+2\mathrm{p}\hat{\mathrm{k}} \end{gathered}$$

Find the angle between $\left(\overrightarrow{\mathrm{A}}-\overrightarrow{\mathrm{B}}\right) \& \overrightarrow{\mathrm{C}}$

The vector having a magnitude of 10 and perpendicular to the vector $3\hat{\mathrm{i}}-4\hat{\mathrm{j}}$ is 

A force $\overrightarrow{\mathrm{F}}=3\hat{\mathrm{i}}+\mathrm{c}\hat{\mathrm{j}}+2\hat{\mathrm{k}}$ acting on a particle causes a displacement $\overrightarrow{\mathrm{d}}=-4\hat{\mathrm{i}}+2\hat{\mathrm{j}}+3\hat{\mathrm{k}}$. If the work done is 6J then the value of 'c' is

A vector that is perpendicular to both the vectors $\overrightarrow{\mathrm{a}}=\hat{\mathrm{i}}-2\hat{\mathrm{j}}+\hat{\mathrm{k}}$ and $\overrightarrow{\mathrm{b}}=\hat{\mathrm{i}}-\hat{\mathrm{j}}+\hat{\mathrm{k}}$ is

If $\mathrm{\theta }$ is the angle between vectors $\overrightarrow{\mathrm{a}}$ and $\overrightarrow{\mathrm{b}}$, and $|\overrightarrow{\mathrm{a}}\times \overrightarrow{\mathrm{b}}|=\overrightarrow{\mathrm{a}}.\overrightarrow{\mathrm{b}}$, then $\mathrm{\theta }$ is equal to

The vector $\overrightarrow{\mathrm{b}}$, which is collinear with the vector $\overrightarrow{\mathrm{a}}$=(2, 1, -1) and satisfies the condition $\overrightarrow{\mathrm{a}}$.$\overrightarrow{\mathrm{b}}$=3, is 

If $3\hat{\mathrm{i}}+2\hat{\mathrm{j}}+8\hat{\mathrm{k}}$ and $2\hat{\mathrm{i}}+\mathrm{x}\hat{\mathrm{j}}+\hat{\mathrm{k}}$ are at right angle then x=

If a, b, c are three non-zero vectors such that $\overrightarrow{\mathrm{a}}+\overrightarrow{\mathrm{b}}+\overrightarrow{\mathrm{c}}=0$ the value of $\overrightarrow{\mathrm{a}}.\overrightarrow{\mathrm{b}}+\overrightarrow{\mathrm{b}}.\overrightarrow{\mathrm{c}}+\overrightarrow{\mathrm{c}}.\overrightarrow{\mathrm{a}}$ is

Let $\mathrm{\alpha }, \mathrm{\beta }, \mathrm{\gamma }$ be distinct real numbers. The points with position vectors $\mathrm{\alpha }\hat{\mathrm{i}}+\mathrm{\beta }\hat{\mathrm{j}}+\mathrm{\gamma }\hat{\mathrm{k}} , \mathrm{\beta }\hat{\mathrm{i}}+\mathrm{\gamma }\hat{\mathrm{j}}+\mathrm{\alpha }\hat{\mathrm{k}} , \mathrm{\gamma }\hat{\mathrm{i}}+\mathrm{\alpha }\hat{\mathrm{j}}+\mathrm{\beta }\hat{\mathrm{k}}$