11. Which of the following is not a ceramic-

A. Alumina

B. Whisker

C. Pyrosil

D. Porcelain

Click for Answer/Explanation

Correct Answer is C

12. Tempering is a process of annealing-

A. martensite at low temperatures

B. martensite at a higher temperature

C. bainite at low temperature

D. bainite at a higher temperature

Click for Answer/Explanation

Correct Answer is A

Read More- Welding Types and Definitions Notes

13. Which one of the following materials can be subjected to an age hardening process-

A. HSS

B. Stellite

C. Pure Iron

D. Aluminum

Click for Answer/Explanation

Correct Answer is D

14. Windows of Aeroplane are made of-

A. PVC

B. PMMA

C. PTFE

D. PEEK

Click for Answer/Explanation

Correct Answer is B

PMMA – Polymethyl methacrylate

It is a transparent thermoplastic. It is also called as Acrylic glass.

15. Cleavage fracture is a type of-

A. Brittle fracture

B. Ductile fracture

C. Elastic fracture

D. Viscoelastic fracture

Click for Answer/Explanation

Correct Answer is A

In brittle crystalline materials, the fracture can occur by cleavage as a result of tensile stress acting normal to the crystallographic planes with low bonding.

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