Engineering Sciences
2017 · Paper 1
Take it one question at a time. Try an answer, then check your understanding.
Complete GATE XE 2017 Paper 1 overview, original pages and practice · Timed previous-paper practice
Questions 49–51 of 175. Imported answers require review unless explicitly marked reviewed.
Question 49
Open questionXE-CMCQ2 marksNeeds review
Which of the following statement(s) is/are true
(i) All piezoelectric materials are necessarily ferroelectric
(ii) All ferroelectric materials are necessarily piezoelectric
(iii) All pyroelectric materials are necessarily piezoelectric
(iv) All pyroelectric materials are necessarily ferroelectric
Your answerChoose one option.
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Open questionXE-CNAT2 marksNeeds review
If the energy of formation of vacancies in pure copper is 0.9 eV, the fraction of vacancies in pure copper at 27 °C will be ..........
(Boltzmann’s constant is 8.62
eV/K)Log in to check the answer
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Open questionXE-CNAT2 marksNeeds review
A ceramic material with a critical flaw size of 30
m has fracture stress of 300 MPa. For the same material the fracture stress for a critical flaw size of 90
m will be ..............MPa.Log in to check the answer
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