Physics - 2017 Past Year Paper - IIT JAM MCQ

# Physics - 2017 Past Year Paper - IIT JAM MCQ

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## 30 Questions MCQ Test - Physics - 2017 Past Year Paper

Physics - 2017 Past Year Paper for IIT JAM 2024 is part of IIT JAM preparation. The Physics - 2017 Past Year Paper questions and answers have been prepared according to the IIT JAM exam syllabus.The Physics - 2017 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 - 2017 Past Year Paper below.
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Physics - 2017 Past Year Paper - Question 1

### The dispersion relation for electromagnetic waves travelling in a plasma is given as w2 = c2k2 + wp2, where c and wp are constants. In this plasma, the group velocity is :

Physics - 2017 Past Year Paper - Question 2

### Consider the following circuit with two identical Si diodes. The input ac voltage waveform has the peak voltage Vp = 2V, as shown. The voltage waveform across PQ will be represented by :

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Physics - 2017 Past Year Paper - Question 3

### A current I = 10A flows in an infinitely long wire along the axis of a hemisphere (see figure). The value    over the hemispherical surface as shown in the figure is :

Physics - 2017 Past Year Paper - Question 4

Consider two, single turn, co- planar, concentric coils of radii R1 and R2 with R1 >> R2. The mutual inductance between the two coils is proportional to

Physics - 2017 Past Year Paper - Question 5

If the Boolean function Z = PQ + PQR + PQRS + PQRST + PQRSTU, then Z is :

Detailed Solution for Physics - 2017 Past Year Paper - Question 5

Physics - 2017 Past Year Paper - Question 6

Shown in the figure is a combination of logic gates. The output values at P and Q are correctly represented by which of the following ?

Physics - 2017 Past Year Paper - Question 7

Which of the following is due to inhomogeneous refractive index of earth’s atmosphere ?

Physics - 2017 Past Year Paper - Question 8

For the three matrices given below, which one of the choices is correct ?

Physics - 2017 Past Year Paper - Question 9

A plane in a cubic lattice makes intercepts of a, a/2 and 2a/3 with the three crystallographic axes, respectively. The Miller indices for this plane are :

Physics - 2017 Past Year Paper - Question 10

Which one of the following schematic curves best represents the variation of conductivity s of a metal with temperature T ?

Physics - 2017 Past Year Paper - Question 11

Consider an inertial frame S' moving at speed c/2 away from another inertial frame S along the common x- x' axis, where c is the speed of light, As observed from S', a particle is moving with speed c/2 in the y' direction, as shown in the figure. The speed of the particle as seen from S is:

Physics - 2017 Past Year Paper - Question 12

Consider a uniform thin circular disk of radius R and mass M. A concentric square of side R/2 is cut out from the disk (see figure). What is the moment of inertia of the resultant disk about an axis passing through the centre of the disk and perpendicular to it ?

Physics - 2017 Past Year Paper - Question 13

Consider a system of N particles obeying classical statistics, each of which can have an energy 0 or E. The system is in thermal contact with a reservoir maintained at a temperature T. Let k denote the Boltzmann constant. Which one of the following statements regarding the total energy U and the heat capacity C of the system is correct ?

Physics - 2017 Past Year Paper - Question 14

The integral of the vector    (standard notation for cylindrical coordinates is used) over the volume of a cylinder of height L and radius R0 :

Physics - 2017 Past Year Paper - Question 15

Consider Rydberg (Hydrogen-like) atoms in a highly excited state with n around 300. The wavelength of radiation coming out of these atoms for transitions to the adjacent states lies in the range:

Physics - 2017 Past Year Paper - Question 16

A uniform rigid meter- scale is held horizontally with one of its end at the edge of a table and the other supported by hand. Some coins of negligible mass are kept on the meter scale as shown in the figure.

As the hand supporting the scale is removed, the scale starts rotating about its edge on the table and the coins start moving. If a photograph of the rotating scale is taken soon after, it will look closest to :

Physics - 2017 Past Year Paper - Question 17

Consider two identical, finite, isolated systems of constant heat capacity C at temperatures T1 and T2, (T1 > T2). An engine works between them until their temperatures become equal. Taking into account that the work performed by the engine will be maximum (=Wmax) if the process is reversible (equivalently, the entropy change of the entire system is zero), the value of W max is:

Physics - 2017 Past Year Paper - Question 18

A white dwarf star has volume V and contains N electrons so that the density of electrons is    Taking the temperature of the star to be 0K, the average energy per electron in the star    where m is the mass of the electron. The electronic pressure in the star is:

Physics - 2017 Past Year Paper - Question 19

A pendulum is made of a massless string of length L and a small bob of negligible size and mass m. It is released making an angle q0 (<<1 rad) from the vertical. When passing through the vertical, the string slips a bit from the pivot so that its length increases by a small amount d(d << L) in negligible time. If it swings up to angle q1 one the other side before starting to swing back, then to a good approximation which of the following expressions is correct?

Physics - 2017 Past Year Paper - Question 20

To demonstrate Bernoulli’s principle, an instructor arranges two circular horizontal plates of radii b each with distance d(d << b) between them (see figure). The upper plate has a hole of radius a in the middle. On blowing air at a speed v0 through the hole so that the flow rate of air is pa2v0, it is seen that the lower plate does not fall. If the density of air is r, the upward force on the lower plate is well approximated by the formula (assume that the region with r < a does not contribute to the upward force and the speed of air at the edges is negligible) :

Physics - 2017 Past Year Paper - Question 21

KCl has the NaCl type structure which is fcc with two- atom basis, one at (0, 0, 0) and the other at    Assume that the atomic form factors of K+ and Cl– are identical. In an X- ray diffraction experiment on KCl, which of the following (h k l) peaks will be observed?

Physics - 2017 Past Year Paper - Question 22

Which one of the following graphs represents the derivative    of the function    most closely (graphs are schematic and not drawn to scale)?

Physics - 2017 Past Year Paper - Question 23

​Bar magnet of magnetic moment 200 A-m2 is suspended in a magnetic field of intensity 0.25N/Am. The couple required to deflect it through 30° is

Physics - 2017 Past Year Paper - Question 24

Consider a thin long insulator coated conducting wire carrying current I. It is now wound once around an insulating thin disc of radius R to bring the wire back on the same side, as shown in the figure. The magnetic field at the centre of the disc is equal to:

Detailed Solution for Physics - 2017 Past Year Paper - Question 24

Physics - 2017 Past Year Paper - Question 25

Consider two coherent point source (S1 and S2) separated by a small distance along a vertical line and two screens P1 and P2 placed as shown in figure. Which one of the choices represents the shapes of the interference fringes at the central regions on the screens ?

Physics - 2017 Past Year Paper - Question 26

The electric field of an electromagnetic wave is given by

The value of β is (c is the speed of light) :

Physics - 2017 Past Year Paper - Question 27

Unpolarized light is incident on a combination of a polarizer, a λ/2 plate and a λ/4 plate kept one after the other. What will be the output polarization for the following configurations?
Configuration 1: Axes of the polarizer, the λ/2 plate and the λ/4 plate are all parallel to each other.
Configuration 2: The λ/2 plate is rotated by 45º with respect to configuration 1.
Configuration 3: The λ/4 plate is rotated by 45º with respect to configuration 1.

Physics - 2017 Past Year Paper - Question 28

For the Fourier series of the following function of period 2π

the ratio (to the nearest integer) of the Fourier coefficients of the first and the third harmonic is:

Physics - 2017 Past Year Paper - Question 29

An n- p- n transistor is connected in a circuit as shown in the figure. If IC = 1mA, b = 50, VBE = 0.7V, and the current through R2 is 10IB, where IB is the base current. Then the ratio R1/R2 is :

Physics - 2017 Past Year Paper - Question 30

A rectangular loop of dimension L and width w moves with a constant velocity v away from an infinitely long straight wire carrying a current I in the plane of the loop as shown in the figure below. Let R be the resistance of the loop. What is the current in the loop at the instant the nearside is at a distance r from the wire?

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