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Work ,Energy and Power MCQ





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Multiple Choice Questions

Question 1
A peculiar spring has a force law
$F = -Dx^3$
which of the following is true
(a) potential energy at point x when U = 0 at x = 0 is $\frac{Dx^4}{4}$
(b) if a mass m is attached to the spring. Mass is displaced slightly, it will follow simple harmonic motion
(c) $\frac{Dx^4}{4}$ work has to be done on the spring in stretching it slowing from 0 to x
(d) none of the above

Question 2
An object of mass M slides downward along a plane inclined at angle θ .
The coefficient of friction is k
Find d(U + KE)/dt
(a) kmg2cosθ (sinθ - kcosθ)
(b) kmg2sinθ (sinθ - kcosθ)
(c) kmg2 (sinθ - kcosθ)
(d) none of the above

Question 3
What is true for gravitational force
(a) work done between the two points does not depend on the path travelled
(b) work done in a closed loop is zero
(c) W = - ΔU
(d) it is a conservative force

Question 4
An object moves on a inclined plane in upward direction at uniform velocity. Neglect frictional force. Which of the following is true
(a) gravitational force does negative work
(b) engine does positive work
(c) normal reaction force does not do any work
(d) none of the above



Question 5
If F is the conservative force, U is potential energy associated with this force and dr... is displacement. Which of the following is true
(a)$\oint{\mathbf{F}.d\mathbf{r}=0}$
(b) dU.=F.dr
(c) $\mathbf{F}= \frac{-\partial U}{\partial x}\mathbf{i}+ \frac{-\partial U}{\partial y}\mathbf{j} +\frac{-\partial U}{\partial z}\mathbf{k}$
(d) none of the above

Question 6
A body(m) is moving along positive x axis at t = 0, v = v0 and x = 0
It is subjected to retarded force
$F = -2x$
Find the x coordinate, where $\frac {dx}{dt}$ is 0
(a) x = v0 √(m/2)
(b) x = v0 √(m)
(c) x = v0 √(2m)
(d) none of the above

Question 7
A particle moves from rest at point P1 on the surface of the smooth circular cylinder of radius R
Find the angle it will leave the cylinder
(a) θ = sin-12/3
(b) θ = cos-11/3
(c) θ = cos-12/3
(d) none of the above

Question 8
The kinetic energy of a particle moving along a circle of radius R depend on the distance covered S as
$T = aS^2$
where a is constant
find the force acting on the particle as a function of S
(a) 2aS2/R
(b) 2aS √[1 + (S/R)2]
(c) 2aS √[1 - (S/R)2]
(d) none of the above

Question 9
A body is thrown vertically upward with a velocity v. It rise to some height and come back. find the mean power over all cycle
(a) mgv
(b) 0
(c) mgv2
(d) none of the above

Question 10
An electron and a proton are moving under the influence of mutual forces. In calculating the change in the kinetic energy of the system during motion, one ignores the magnetic force of one on another. This is because,
(a) the two magnetic forces are equal and opposite, so they produce no net effect.
(b) the magnetic forces do no work on each particle.
(c) the magnetic forces do equal and opposite (but non-zero) work on each particle.
(d) the magenetic forces are necessarily negligible


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