GATE XE format:msq PYQs & Answers — Page 7

Questions 61–70 of 145. Imported answers require independent review unless marked reviewed.

Topic practice 145 questionsPage 7 of 15

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

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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?

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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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Which of the following figures schematically represent(s) either the Frenkel defect or the Schottky defect in ionic solids?

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Diagram for Engineering Sciences question 59

Diagram for Engineering Sciences question 59 (figure 2)

Diagram for Engineering Sciences question 59 (figure 3)

Diagram for Engineering Sciences question 59 (figure 4)

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Given that k is the first order reaction rate constant and T is the temperature in absolute scale, the temperature dependence of rate constant is/are represented by

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Diagram for Engineering Sciences question 60

Diagram for Engineering Sciences question 60 (figure 2)

Diagram for Engineering Sciences question 60 (figure 3)

Diagram for Engineering Sciences question 60 (figure 4)

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For chemical vapour deposition (CVD) process, which of the following statements is/are correct?

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Target material is striped off by the bombardment of positive ions

Source material is vapourized and thermally decomposed

Partial hydrolysis of alkoxide in water solvent

Suitable for preparing films of high density and uniform thickness

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A solid circular shaft of diameter 100 mm is subjected to a torque

kNm. Which of the following statements about the state of stress in the shaft is/are correct?

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The maximum shear stress is 48 MPa

The maximum tensile stress is 48 MPa

The magnitude of maximum compressive stress is 48 MPa

The magnitude of shear stress is 48 MPa at all points in the shaft

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A critical point on a component is subjected to the state of stress

as given in the following. The yield strength of the material is 400 MPa. By considering maximum shear stress (Tresca) theory, the possible value(s) of

at the onset of yielding is/are,

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340

680

−120

−460

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A closed system containing an unknown substance undergoes an adiabatic process governed by the relation

, where

is pressure,

is volume, and

is the ratio of specific heats. For this scenario, which of the following statements is/are always TRUE?

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The substance is an ideal gas and process is reversible

The substance is a liquid and process is reversible

The substance is a non-ideal gas and process is reversible

The substance is an ideal gas and process is NOT reversible

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Two rigid, impermeable containers

and

are filled with an ideal gas. They are allowed to exchange heat only with each other and not with the surroundings.

, and

represent the pressure, total volume, number of moles, and temperature, respectively. At equilibrium, which of the following conditions is/are necessarily satisfied?

(Subscripts

and

represent properties of the gas in the respective containers.)

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Which of the following polymers is/are synthesized by ring opening polymerization?

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Poly(lactic acid)

Poly(ε-caprolactone)

Poly(styrene)

Poly(aniline)

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GATE XE format:msq PYQs

Question 57

Question 58

Question 59

Question 60

Question 61

Question 72

Question 79

Question 93

Question 94

Question 118