GATE MT year:2021 PYQs & Answers — Page 3

Questions 21–30 of 65. Imported answers require independent review unless marked reviewed.

Topic practice 65 questionsPage 3 of 7

For a zeroth order chemical reaction, which one of the following is FALSE?

Your answerChoose one option.

Concentration versus time plot is a straight line.

Increase in concentration of reacting species increases the rate of reaction.

Half-life depends on the initial concentration and zero-order rate constant.

Rate of reaction depends on temperature.

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Which one of the following elements oxidizes first in basic oxygen steel making process?

Your answerChoose one option.

Silicon

Carbon

Manganese

Phosphorus

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Which one of the following is a hydrometallurgical operation?

Your answerChoose one option.

Roasting

Leaching

Zone refining

Smelting

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The value of

is: __________ (round off to nearest integer).

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The grain size (X) of annealed specimens follows a symmetric distribution with a mean (μ) of 5 μm and a standard deviation (σ) of 0.5 μm. The percentage of specimens with grain size in the range 5 to 6 μm is expected to be: __________ (round off to nearest integer).

Given: For the symmetric distribution: Probability P(X ≤ μ + 2σ) = 0.98

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V, the value of

(in J mol

) at 298 K is: __________ (round off to nearest integer).

Given: F = 96500 C mol

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Melting point of Cu is 1358 K and its enthalpy of melting is 13400 J mol

. The value of free energy change (in J mol

) for liquid to solid transformation at 1058 K is: __________ (round off to nearest integer).

Assume:

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A body is subjected to a state of stress given by the following stress tensor:

MPa.

If yielding is predicted by the Tresca Criterion, the uniaxial tensile yield stress (in MPa) of the body should be less than or equal to: __________ (round off to nearest integer).

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Consider homogeneous nucleation of a spherical solid in liquid. For a given undercooling, if surface energy of a nucleus increases by 20 %, the corresponding increase (in percent) in the critical radius of the nucleus is: __________ (round off to nearest integer).

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If saturation magnetization of iron at room temperature is 1700 kA m

, the magnetic moment (in A m

) per iron atom in the crystal is: ______ × 10

(round off to 1 decimal place).

(Given: Lattice parameter of iron at room temperature = 0.287 nm)

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GATE MT year:2021 PYQs

Question 11

Question 12

Question 13

Question 14

Question 15

Question 16

Question 17

Question 18

Question 19

Question 20