NEET Physics Work Energy and Power NEET s MCQ Questions - Practice Now

Question 1

The energy that will be ideally radiated by a $100 \mathrm{kW}$ transmitter in $\text{1 hour}$ is

Accepted Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Question 2

Water falls from a height of ${\text{60 m}}$ at the rate of ${\text{15 kg/s}}$ to operate a turbine. The losses due to frictional force are 10% of the input energy. How much power is generated by the turbine?

Given $g=$${10 \text{ m/s}^2}$

Accepted Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Question 3

A particle is released from height $S$ from the surface of the Earth. At a certain height its kinetic energy is three times its potential energy. The height from the surface of earth and the speed of the particle at that instant are respectively

Accepted Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Question 4

A force $ F = (20 + 10y) $ acts on a particle in y-direction where $F$ is in newtons and $y$ in meter. Work done by this force to move the particle from $y = 0$ to $y = 1 \mathrm{m}$

Accepted Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Question 5

A particle of mass $M$ starting from rest undergoes uniform acceleration. If the speed acquired in time $T$ is $v$, the power delivered to the particle is

Accepted Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Question 6

A body of mass $1\text{ kg}$ begins to move under the action of a time dependent force $\vec{F}=(2t\hat{i}+3t^2\hat{j})$ newton. where $\hat{i}$ and $\hat{j}$ are directions along $x$ and $y$ axis what is power at time $t$.

Accepted Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Question 7

A body projected vertically from the earth reaches a height equal to earths radius before returning to the earth. The power exerted by the gravitational force is greatest.

Accepted Answer

At the instant just before the body hits the earth.

Answer

At the highest position of the body.

Answer

It remains constant all through.

Answer

At the instant just after the body is projected.

Question 8

A car of mass $m$ starts from rest and accelerates so that the instantaneous power delivered to the car has a constant magnitude $P_0$. The instantaneous velocity of this car is proportional to:

Accepted Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Question 9

What is the minimum velocity with which a body of mass ${ m}$ must enter a vertical loop of radius${\ R}$ so that it can complete the loop?

Accepted Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Answer

$36 imes 10^7\mathrm J$

Question 10

Two identical balls A and B having velocities of $0.5\mathrm{\ m\ s^{-1}}$ and $-0.3\mathrm{\ m\ s^{-1}}$ respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be

Accepted Answer

$36 imes 10^7\mathrm J$ and $\ -0.3\mathrm{\ m\ s^{-1}}$

Answer

$36 imes 10^7\mathrm J$ and $\ 0.3\mathrm{\ m\ s^{-1}}$

Answer

$36 imes 10^7\mathrm J$ and $\ 0.3\mathrm{\ m\ s^{-1}}$

Answer

$36 imes 10^7\mathrm J$ and $\ -0.3\mathrm{\ m\ s^{-1}}$

physics-neet / work-energy-and-power-neet-mcqs

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