GATE XE purpose:exam-prep PYQs & Answers — Page 43

Questions 421–430 of 1772. Imported answers require independent review unless marked reviewed.

Topic practice 1772 questionsPage 43 of 178

Which of the following types of materials exhibit(s) positive magnetic susceptibility?

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

Paramagnetic

Diamagnetic

Ferrimagnetic

Ferromagnetic

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Which of the following is/are responsible for pitting corrosion in a metal ?

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

Rough surface

Grain boundaries

Polished surface

Polymer coated metal surface

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In thermogravimetric analysis (TGA), weight change of a material sample during decomposition with temperature is shown in the figure below.

Diagram for Engineering Sciences question 51

and

represent the weight of the material, corresponding to temperatures

and

, respectively. Which of the following factor(s) can influence

and

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

Heating rate

Particle size of the material

Atmosphere in the sample chamber

Initial weight of the sample

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The work done by a body expanding from an initial state A to the final state B, as shown in the P-V diagram below, is (in units of litre-atm) __________ (rounded off to nearest integer).

Diagram for Engineering Sciences question 52

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A binary phase diagram is given below.

Diagram for Engineering Sciences question 53

Which one of the following figures qualitatively represents the G-X (Gibbs free energy – composition) plot at temperature

shown in the phase diagram?

Your answerChoose one option.

Diagram for Engineering Sciences question 53 (figure 2)

Diagram for Engineering Sciences question 53 (figure 3)

Diagram for Engineering Sciences question 53 (figure 4)

Diagram for Engineering Sciences question 53 (figure 5)

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Which one of the following figures corresponds to the density of states

of a typical intrinsic semiconductor? (

represents the energy level of a charge carrier)

Your answerChoose one option.

Diagram for Engineering Sciences question 54

Diagram for Engineering Sciences question 54 (figure 2)

Diagram for Engineering Sciences question 54 (figure 3)

Diagram for Engineering Sciences question 54 (figure 4)

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The Miller indices for the shaded plane shown in the unit cell below is

Diagram for Engineering Sciences question 55

Your answerChoose one option.

[632]

[123]

(632)

(123)

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Which one of the following curves best represents the E vs.

behavior of the hot end of a metal rod demonstrating Seebeck Effect? (

is the probability of electron occupancy at an energy state

;

is the Fermi energy)

Your answerChoose one option.

Diagram for Engineering Sciences question 56

Diagram for Engineering Sciences question 56 (figure 2)

Diagram for Engineering Sciences question 56 (figure 3)

Diagram for Engineering Sciences question 56 (figure 4)

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In a typical light emitting diode (LED), which of the following type(s) of materials is/are used?

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

Indirect bandgap semiconductor with transition metal impurities

Direct bandgap semiconductor

Indirect bandgap semiconductor with isoelectronic impurities

Indirect bandgap semiconductor without any impurity

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Which of the following options is/are true for glass transition temperature T_g?

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

Above T_g, glass transforms from an amorphous solid to a viscous liquid.

At T_g, glass transforms from an amorphous solid to a crystalline solid.

T_g is dependent on the heating rate.

Below T_g, nucleation and growth takes place in glass.

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GATE XE purpose:exam-prep PYQs

Question 49

Question 50

Question 51

Question 52

Question 53

Question 54

Question 55

Question 56

Question 57

Question 58