Physics - 2018 Past Year Paper - IIT JAM MCQ
30 Questions MCQ Test - Physics - 2018 Past Year Paper
Let f(x, y) = x3 − 2y3 . The curve along which ∇2f = 0 is
A curve is given by 
The unit vector of the tangent to the curve at t =1 is
The unit vector of the tangent to the curve at t =1 is| 1 Crore+ students have signed up on EduRev. Have you? Download the App |
There are three planets in circular orbits around a star at distances a, 4a and 9a, respectively. Attime t = t0, the star and the three planets are in a straight line. The period of revolution of theclosest planet is T. How long after t0 will they again be in the same straight line?
A current I is flowing through the sides of an equilateral triangle of side a. The magnitude of the magnetic field at the centroid of the triangle is
Two vehicles A and B are approaching an observer O at rest with equal speed as shown in the figure. Both vehicles have identical sirens blowing at a frequency fs . The observer hears these sirens at frequency fA and fB, respectively from the two vehicles. Which one of the following is correct?
Three infinite plane sheets carrying uniform charge densities −σ, 2σ, 3σ are placed parallel to the
x-z plane at y = a, 3a, 4a , respectively. The electric field at the point (0, 2a, 0) is
Two boxes A and B contain an equal number of molecules of the same gas. If the volumes are VA
and VB, and λA and λB denote respective mean free paths, then
Let Tg and Te be the kinetic energies of the electron in the ground and the third excited states of ahydrogen atom, respectively. According to the Bohr model, the ratio Tg/ Te is
Which one of the following arrangements of optical components can be used to distinguish between
an unpolarised light and a circularly polarised light?
Which one of the following graphs shows the correct variation of vo with vi? Here, vd is the voltage
drop across the diode and the Op-Amp is assumed to be ideal.
Which one of the figures correctly represents the T-S diagram of a Carnot engine?
The plane of polarisation of a plane polarized light rotates by 60° after passing through a waveplate. The pass-axis of the wave plate is at an angle α with respect to the plane of polarisation of theincident light. The wave plate and α are
A rectangular loop of dimensions l and w moves with a constant speed of v through a region containing a uniform magnetic field B directed into the paper and extending a distance of 4w. Which of the following figures correctly represents the variation of emf (ε) with the position (x) of the front end of the loop?
The equation of state for one mole of a non-ideal gas is given by PV = A 
where the coefficients A and B are temperature dependent. If the volume changes from V1 to V2 in an isothermal process, the work done by the gas is
An ideal gas consists of three dimensional polyatomic molecules. The temperature is such that only
one vibrational mode is excited. If R denotes the gas constant, then the specific heat at constant
volume of one mole of the gas at this temperature is
A long solenoid is carrying a time dependent current such that the magnetic field inside has the form 
is along the axis of the solenoid. The displacement current at the
point P on a circle of radius r in a plane perpendicular to the axis
Consider an ensemble of thermodynamic systems, each of which is characterized by the samenumber of particles, pressure and temperature. The thermodynamic function describing theensemble is
Given a spherically symmetric charge density ρ(r) 
(k being a constant), the electric field for r < R is (take the total charge as Q)
An infinitely long solenoid, with its axis along 
, carries a current I. In addition there is a uniform line charge density λ along the axis. If 
is the energy flux, in cylindrical coordinates 
then
Consider two waves y1 = a cos(ωt − kz) and y2 = a cos[(ω + Δω)t − (k + Δk)z]. The group velocity of the superposed wave will be (Δω ≪ ω and Δk ≪ k)
Consider a convex lens of focal length f. A point object moves towards the lens along its axis between 2f and f. If the speed of the object is VO, then its image would move with speed VI. Whichof the following is correct?
A disc of radius R1 having uniform surface density has a concentric hole of radius R2 < R1. If its
mass is M, the principal moments of inertia are
The function 
is expanded as a Fourier series of the form 
Which one of the following curves correctly represents (schematically) the solution for the equation 
The mean momentum 
of a nucleon in a nucleus of mass number A and atomic number Z depends on A, Z as
can be simplified toConsider the transformation to a new set of coordinates
from rectangular Cartesian coordinates (x, y), where
In the 
coordinate system, the area element dxdy is
A particle of mass m is in a one dimensional potential 
At some instant its wave function is given by 
are the ground and the first excited states, respectively. Identify the correct statement.
A raindrop falls under gravity and captures water molecules from atmosphere. Its mass changes atthe rate λm(t), where λ is a positive constant and m(t) is the instantaneous mass. Assume thatacceleration due to gravity is constant and water molecules are at rest with respect to earth beforecapture. Which of the following statements is correct?
A particle P of mass m is constrained to move on the surface of a cylinder under a force 
as
shown in figure (k is the positive constant). Which of the following statements is correct? (Neglect
friction.)
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