Model Test Physics - 2017 - IIT JAM MCQ

# Model Test Physics - 2017 - IIT JAM MCQ

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## 30 Questions MCQ Test IIT JAM Past Year Papers and Model Test Paper (All Branches) - Model Test Physics - 2017

Model Test Physics - 2017 for IIT JAM 2024 is part of IIT JAM Past Year Papers and Model Test Paper (All Branches) preparation. The Model Test Physics - 2017 questions and answers have been prepared according to the IIT JAM exam syllabus.The Model Test Physics - 2017 MCQs are made for IIT JAM 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Model Test Physics - 2017 below.
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Model Test Physics - 2017 - Question 1

### A beam of protons enters a uniform magnetic field of 0.3 Tesla with a velocity of 4 x 10⁵ m/sec at an angle of 60° to the field. The radius of the helical path taken by the beam is

Detailed Solution for Model Test Physics - 2017 - Question 1

v1 is responsible for horizontal motion of proton

v2 is responsible for circular motion of proton

Mass of proton =  1.67 * 10-27 Kg

Charge on proton= 1.6 * 10-19 C

∴ mv22 / r = qv2 B

r = mv2 /qB

= 1.67 * 10-27 *  4 x 10⁵ / 1.6 * 10-19 * 0.3

= 0.013 m

Pitch of helix = v1 x T

Where T = 2πr / v2

­ = 2πr / v sin θ

⇒ Pitch of helix = v cos θ x 2πr / v sin θ

= 2 πr cotθ

= 2x 3.14 x 0.013 x cot 60°

= 0.0471 m

= 47.1 mm

Model Test Physics - 2017 - Question 2

### The length of a metal wire is l1 when the tension in it is T1 and is l2 when the tension is T2. The natural length of the wire is __________

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Model Test Physics - 2017 - Question 3

### A particle travelling along the positive X- axis with energy E incident on a potential barrier (Vo), which of the following represent the correct wave- form for Vo > E ?

Model Test Physics - 2017 - Question 4

A parallel beam of light travelling in water (refractive index = 4/3) is refracted by a spherical air bubble of radius 2mm situated in water. Assuming the light rays to be parallel, find the position of the final image ?

Model Test Physics - 2017 - Question 5

Which of the following matrices is hermitian ?

Model Test Physics - 2017 - Question 6

The normalized wave function of the hydrogen atom for 1st state is    where    being the Bohr radius. The expectation value of potential energy in this state is __

Model Test Physics - 2017 - Question 7

An AC source producing emf  is connected in series with a capacitor and a resistor. The steady- state current in the circuit is found to be    Which of the following depicts the correct relation?

Model Test Physics - 2017 - Question 8

A neutron moving with speed V makes a head on collision with a hydrogen atom in ground state kept at rest find the minimum kinetic energy of the neutron for which inelastic collision may take place if neutron and hydrogen atom travel with velocity V1 and V2 respectively after collision?

Model Test Physics - 2017 - Question 9

The correct curve between intensity of magnetisation (I) and magnetic field (H) for a ferromagnetic substance is given by.

Model Test Physics - 2017 - Question 10

Model Test Physics - 2017 - Question 11

The group velocity of electromagnetic waves moving with phase velocity c in a dispersive medium of refractive index n is given by :

Model Test Physics - 2017 - Question 12

The radii of Cs and Cl are r1 and r2 respectively the lattice constant if it crystallizes in bcc structure is :

Model Test Physics - 2017 - Question 13

The momentum of an electron (mass m) which has the same kinetic energy as its rest mass energy is:

Model Test Physics - 2017 - Question 14

If at t = 0 the particle is in state    where  re the ground and first excited states, respectively for a particle in a cubical box of size a, the state vector ψ(x, t), for t > 0 in the Schrodinger picture is:

Model Test Physics - 2017 - Question 15

then the average value of the position vector in the range – L/2 to + L/2 is given by

Model Test Physics - 2017 - Question 16

The electric field of a wave propagating in the x – y plane, with wave vector k
making an angleof 30o with the x- axis is:

Model Test Physics - 2017 - Question 17

The correct plot for the equivalent one dimensional potential for an attractive inverse fourth law of force :

Model Test Physics - 2017 - Question 18

The Lorentz transformation are equivalent to rotation of axes in four dimensional space through an imaginary angle ______

Model Test Physics - 2017 - Question 19

The transistor gain of the circuit shown in the figure is given by ______

Model Test Physics - 2017 - Question 20

The total energy of an ionic solid is given by   where a is the Madelung constant, r is the distance between the nearest neighbour in the crystal. If r0 is the equilibrium separation then the constant B is given by ______

Model Test Physics - 2017 - Question 21

In a simple cubic lattice d100 : d110 : d111 is _____

Model Test Physics - 2017 - Question 22

Order and degree of the differential equation

Model Test Physics - 2017 - Question 23

For an n- p- n transistor connected as shown in the figure. VBE = 0.7V. Given that reverse saturation current of the junction at room temperature 300o k is 10-13 A, the emitter current is ______

Model Test Physics - 2017 - Question 24

A two dimensional lattice has that basic vectors  The basic vectors of the reciprocal lattice will be ____

Model Test Physics - 2017 - Question 25

XY is an infinite line charge distribution. P and Q are points as shown. The ratio of electric field at P and Q is :

Model Test Physics - 2017 - Question 26

Model Test Physics - 2017 - Question 27

A system consists of three spin half particles the Z- component of whose spin SZ(1), SZ(2) and SZ(3) can take any value +1/2 and - 1/2. The total spin of the system is SZ = SZ (1) + SZ (2) + SZ (3). The total number of possible micro states for this system is _______

Model Test Physics - 2017 - Question 28

The output voltage of a certain op- amp appears as shown in figure in response to a step input,

The slew rate is :

Model Test Physics - 2017 - Question 29

The figure shown in the energy level diagram corresponds to a

*Multiple options can be correct
Model Test Physics - 2017 - Question 30

If we introduce the operators

AND

Then which relation is correct:-

## IIT JAM Past Year Papers and Model Test Paper (All Branches)

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