GATE MT 2018 Paper 1 — page 13

Questions 37–39 of 65. Imported answers require review unless explicitly marked reviewed.

Determine the correctness (or otherwise) of the following Assertion [A] and the Reason [R]

Assertion [A]: For a material exibiting Coble creep, a reduction in grain size results in a significant increase in creep rate Reason [R]: Grain boundaries act as a barrier to motion of dislocations

Your answerChoose one option.

Both [A] and [R] are true and [R] is the correct reason for [A]

Both [A] and [R] are true, but [R] is not the correct reason for [A]

Both [A] and [R] are false

[A] is true but [R] is false

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Determine the correctness (or otherwise) of the following Assertion [A] and the Reason [R]

Assertion [A]: Refractory BCC metals like W and Mo are less ductile than FCC metals like Ni and Pt at room temperature Reason [R]: BCC metals have fewer independent slip systems than FCC metals

Your answerChoose one option.

Both [A] and [R] are true and [R] is the correct reason for [A]

Both [A] and [R] are true, but [R] is not the correct reason for [A]

Both [A] and [R] are false

[A] is true but [R] is false

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A glass fibre of 5 micron diameter is subjected to a tensile stress of 20 MPa. The surface energy and elastic modulus of this material are 0.3 Jm

and 70 GPa, respectively. Pick the correct answer based on the information provided above:

Note: The glass fibre contains a population of flaws of different lengths.

Your answerChoose one option.

The fibre will undergo brittle fracture

The fibre will undergo plastic deformation, but not fracture

The fibre will undergo elastic deformation, but not fracture

The fibre will undergo buckling

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2018 · Paper 1

Question 27

Question 28

Question 29