GATE PH kind:question PYQs & Answers — Page 35

Questions 341–350 of 650. Imported answers require independent review unless marked reviewed.

Consider a solenoid of length

and radius

, where

. A steady-current flows through the solenoid. The magnetic field is uniform inside the solenoid and zero outside.

Among the given options, choose the one that best represents the variation in the magnitude of the vector potential,

, as a function of the radial distance

in cylindrical coordinates.

Useful information: The curl of a vector

, in cylindrical coordinates is

Your answerChoose one option.

Diagram for Physics question 6 (figure 2)

Diagram for Physics question 6 (figure 3)

Diagram for Physics question 6 (figure 4)

Diagram for Physics question 6 (figure 5)

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Assume that

(

) undergoes first forbidden

-decay from its ground state with spin-parity

, to a final state

. The possible values for

and

, respectively, are

Your answerChoose one option.

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In an experiment, it is seen that an electric-dipole (

) transition can connect an initial nuclear state of spin-parity

to a final state

. All possible values of

are

Your answerChoose one option.

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Choose the correct statement from the following.

Your answerChoose one option.

Silicon is a direct band gap semiconductor.

Conductivity of metals decreases with increase in temperature.

Conductivity of semiconductors decreases with increase in temperature.

Gallium Arsenide is an indirect band gap semiconductor.

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A two-dimensional square lattice has lattice constant

represents the wavevector in reciprocal space. The coordinates

of reciprocal space where band gap(s) can occur, are

Your answerSelect all correct options. You can choose more than one.

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As shown in the figure, an electromagnetic wave with intensity

is incident at the interface of two media having refractive indices

and

. The wave is reflected with intensity

and transmitted with intensity

. Permeability of each medium is the same. (Reflection coefficient

and Transmission coefficient

.) Choose the correct statement(s).

Your answerSelect all correct options. You can choose more than one.

and polarization of incident light is parallel to the plane of incidence.

and polarization of incident light is perpendicular to the plane of incidence.

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A material is placed in a magnetic field intensity

. As a result, bound current density

is induced and magnetization of the material is

. The magnetic flux density is

. Choose the correct option(s) valid at the surface of the material.

Your answerSelect all correct options. You can choose more than one.

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For a finite system of Fermions where the density of states increases with energy, the chemical potential

Your answerSelect all correct options. You can choose more than one.

decreases with temperature

increases with temperature

does not vary with temperature

corresponds to the energy where the occupation probability is 0.5

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Among the term symbols

and

choose the option(s) possible in the

coupling notation.

Your answerSelect all correct options. You can choose more than one.

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To sustain lasing action in a three-level laser as shown in the figure, necessary condition(s) is(are)

Your answerSelect all correct options. You can choose more than one.

lifetime of the energy level 1 should be greater than that of energy level 2

population of the particles in level 1 should be greater than that of level 0

lifetime of the energy level 2 should be greater than that of energy level 0

population of the particles in level 2 should be greater than that of level 1

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GATE PH kind:question PYQs

Question 6

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Question 8

Question 9

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15