Physics - 2018 Past Year Paper - IIT JAM MCQ

# Physics - 2018 Past Year Paper - IIT JAM MCQ

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## 30 Questions MCQ Test - Physics - 2018 Past Year Paper

Physics - 2018 Past Year Paper for IIT JAM 2024 is part of IIT JAM preparation. The Physics - 2018 Past Year Paper questions and answers have been prepared according to the IIT JAM exam syllabus.The Physics - 2018 Past Year Paper MCQs are made for IIT JAM 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Physics - 2018 Past Year Paper below.
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Physics - 2018 Past Year Paper - Question 1

### Let f(x, y) = x3 − 2y3 . The curve along which ∇2f = 0 is

Physics - 2018 Past Year Paper - Question 2

### A curve is given by  The unit vector of the tangent to the curve at t =1 is

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Physics - 2018 Past Year Paper - Question 3

### 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?

Physics - 2018 Past Year Paper - Question 4

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

Physics - 2018 Past Year Paper - Question 5

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?

Physics - 2018 Past Year Paper - Question 6

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

Physics - 2018 Past Year Paper - Question 7

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

Physics - 2018 Past Year Paper - Question 8

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/ Tis

Physics - 2018 Past Year Paper - Question 9

Which one of the following arrangements of optical components can be used to distinguish between
an unpolarised light and a circularly polarised light?

Physics - 2018 Past Year Paper - Question 10

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.

Physics - 2018 Past Year Paper - Question 11

Which one of the figures correctly represents the T-S diagram of a Carnot engine?

Physics - 2018 Past Year Paper - Question 12

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

Physics - 2018 Past Year Paper - Question 13

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?

Physics - 2018 Past Year Paper - Question 14

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

Physics - 2018 Past Year Paper - Question 15

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

Physics - 2018 Past Year Paper - Question 16

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

Physics - 2018 Past Year Paper - Question 17

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

Physics - 2018 Past Year Paper - Question 18

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)

Physics - 2018 Past Year Paper - Question 19

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

Physics - 2018 Past Year Paper - Question 20

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)

Physics - 2018 Past Year Paper - Question 21

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?

Physics - 2018 Past Year Paper - Question 22

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

Physics - 2018 Past Year Paper - Question 23

The function is expanded as a Fourier series of the form

Physics - 2018 Past Year Paper - Question 24

Which one of the following curves correctly represents (schematically) the solution for the equation

Physics - 2018 Past Year Paper - Question 25

The mean momentum  of a nucleon in a nucleus of mass number A and atomic number Z depends on A, Z as

Physics - 2018 Past Year Paper - Question 26

The Boolean expressioncan be simplified to

Physics - 2018 Past Year Paper - Question 27

Consider the transformation to a new set of coordinatesfrom rectangular Cartesian coordinates  (x, y), where In the  coordinate system, the area element dxdy is

Physics - 2018 Past Year Paper - Question 28

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.

Physics - 2018 Past Year Paper - Question 29

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?

Physics - 2018 Past Year Paper - Question 30

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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