GATE MT topic:materials-science PYQs & Answers — Page 59

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topic:materials-science

Questions 581–590 of 650. Imported answers require independent review unless marked reviewed.

Topic practice 650 questionsPage 59 of 65

For the reaction: 4Ag(s, pure) + O

(g) → 2Ag

O(s, pure), the standard enthalpy change,

, and the standard entropy change,

, in the temperature range from 298 K to 500 K. The temperature above which Ag

O decomposes in an atmosphere containing oxygen at a partial pressure

is ______ (in K to one decimal place). Given: Gas constant R = 8.314 J K

mol

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In a powder diffraction experiment on BCC iron, the first peak occurs at

. The wavelength of X-rays is ______ (in nm to three decimal places). Given: The lattice parameter of iron = 0.287 nm

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A 1 mol piece of copper at 400 K is brought in contact with another 1 mol piece of copper at 300 K, and allowed to reach thermal equilibrium. The entropy change for this process is ______ (in J K

to three decimal places) Given: Specific heat capacity of copper (between 250 K and 500 K) is 22.6 J K

mol

. Assume that the system containing the two pieces of copper remains isolated during this process.

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Using the trapezoidal rule with two equal intervals (n = 2, Δx = 1), the definite integral

______________ (to two decimal places).

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The ideal plastic work involved in extruding a cylindrical billet of length 100 mm, from an initial diameter of 20 mm to a final diameter of 16 mm is ______ (in J to one decimal place). The flow stress in compression is 40 MPa, and remains constant throughout the process.

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For the matrix,

Your answerChoose one option.

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The mean of a numerical data-set is

and the standard deviation is

. If a number

is added to each term in the data-set then the mean and standard deviation become:

Your answerChoose one option.

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then at

, the function

Your answerChoose one option.

continuous and differentiable.

continuous but not differentiable.

neither continuous nor differentiable.

not continuous but differentiable.

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The pressure (P) versus volume (V) diagram given below represents reversible isothermal curves at temperatures, T1, T2 and T3.

Diagram for Metallurgical Engineering question 4

Considering one mole of ideal gas for all the three isothermal processes, which one of the following is TRUE?

Your answerChoose one option.

T1 > T2 > T3

T2 > T3 > T1

T3 > T1 > T2

T2 < T1 < T3

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For the electrochemical reaction, Cu²⁺ + Zn = Zn²⁺ + Cu, the standard cell potential at 25°C and 1 atm pressure is: (Given: E° (Cu²⁺/Cu) = 0.337 V and E° (Zn²⁺/Zn) = −0.763 V)

Your answerChoose one option.

−0.426 V

0.426 V

0.55 V

1.1 V

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GATE MT topic:materials-science PYQs

Question 51

Question 52

Question 53

Question 54

Question 55

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Question 5