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

A force $\left(\overrightarrow{F}\right)=3\hat{i}+c\hat{j}+2\hat{k}$ acting on a particle causes a displacement: $\left(\overrightarrow{s}\right)=-4\hat{i}+2\hat{j}+3\hat{k}$ in its own direction. If the work done is 6 J then the value of ‘c’ is 

A force $\overrightarrow{F}=(5\hat{i}+4\hat{j})$N acts on a body and produces a displacement $\overrightarrow{S}=(6\hat{i}-5\hat{j}+3\hat{k})$m. The work done will be 

A uniform chain of length 2m is kept on a table such that a length of 60cm hangs freely from the edge of the table. The total mass of the chain is 4kg. What is the work done in pulling the entire chain on the table 

A particle is acted upon by a force of constant magnitude which is always perpendicular to the velocity of the particle, the motion of the particle takes place in a plane. It follows that 

A force $\overrightarrow{F}=(5\hat{i}+3\hat{j}+2\hat{k})N$ is applied over a particle which displaces it from its origin to the point $\overrightarrow{r}=(2\hat{i}-\hat{j})m$. The work done on the particle in joules is 

Two bodies of masses 1 kg and 5 kg are dropped gently from the top of a tower. At a point 20 cm from the ground, both the bodies will have the same 

A particle moves under the effect of a force F = Cx from x = 0 to x = x₁. The work done in the process is 

A cord is used to lower vertically a block of mass M by a distance d with constant downward acceleration $\frac{g}{4}$. Work done by the cord on the block is 

Two springs have their force constant as k₁ and $k_2(k_1>k_2)$. When they are stretched by the same force 

The potential energy of a certain spring when stretched through a distance ‘S’ is 10 joule. The amount of work (in joule) that must be done on this spring to stretch it through an additional distance ‘S’ will be: