GATE PH format:mcq PYQs & Answers — Page 9

Questions 81–90 of 380. Imported answers require independent review unless marked reviewed.

Four equilateral triangles are used to form a regular closed three-dimensional object by joining along the edges. The angle between any two faces is

Your answerChoose one option.

30°

60°

45°

90°

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is the generating function of a canonical transformation from

, then which one of the following relations is correct?

Your answerChoose one option.

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An unpolarized plane electromagnetic wave in a dielectric medium 1 is incident on a plane interface that separates medium 1 from another dielectric medium 2. Medium 1 and medium 2 have refractive indices

and

, respectively, with

. If the angle of incidence is

, which one of the following statements is true?

Your answerChoose one option.

The reflected wave is unpolarized

The reflected wave is polarized parallel to the plane of incidence

The reflected wave is polarized perpendicular to the plane of incidence

There is no transmitted wave

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The wavefunction of a particle in an infinite one-dimensional potential well at time

where

and

are the normalized ground state, the normalized first excited state and the normalized second excited state, respectively.

and

are the eigen-energies corresponding to

and

, respectively. The expectation value of energy of the particle in state

Your answerChoose one option.

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If a thermodynamic system is adiabatically isolated and experiences a change in volume under an externally applied constant pressure, then the thermodynamic potential minimized at equilibrium is the

Your answerChoose one option.

enthalpy

Helmholtz free energy

Gibbs free energy

grand potential

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The mean distance between the two atoms of HD molecule is

, where H and D denote hydrogen and deuterium, respectively. The mass of the hydrogen atom is

. The energy difference between two lowest lying rotational states of HD in multiples of

Your answerChoose one option.

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Crystal structures of two metals A and B are two-dimensional square lattices with same lattice constant

. Electrons in metals behave as free electrons. The Fermi surfaces corresponding to A and B are shown by solid circles in figures.

The electron concentrations in A and B are

and

, respectively. The value of

Your answerChoose one option.

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Consider the induced nuclear fission reaction

where neutron momenta in both initial and final states are negligible. The ratio of the kinetic energies (KE) of the daughter nuclei,

is __________

Your answerChoose one option.

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The symbols C, D,

and

shown in the figure denote capacitor, ideal diode, input voltage and output voltage, respectively.

Which one of the following output waveforms (

) is correct for the given input waveform (

Your answerChoose one option.

waveform shown in figure

Diagram for Physics question 18 (figure 2)

waveform shown in figure

Diagram for Physics question 18 (figure 3)

waveform shown in figure

Diagram for Physics question 18 (figure 4)

waveform shown in figure

Diagram for Physics question 18 (figure 5)

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Let

and

, respectively, denote number and kinetic energy of electrons produced in a nuclear beta decay. Which one of the following distributions is correct?

Your answerChoose one option.

Diagram for Physics question 19 (figure 2)

Diagram for Physics question 19 (figure 3)

Diagram for Physics question 19 (figure 4)

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GATE PH format:mcq PYQs

Question 10

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17

Question 18

Question 19