Materials and Construction-Data Intensity 1 Multiple Questions and Answers.




1.Pick�out�the�wrong�statement?
A. The toughness of a material decreases, when it is heated
B. Crane hooks are normally made of wrought iron
C. Cold working of a metal decreases its fatigue strength
D. The temperature at which new grains are formed in a metal is known as the recrystallisation temperature

2.Pick�out�the�wrong�statement?
A. Pure rubber is as useless as pure gold as a material of construction
B. Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making
C. Copper has poor weldability
D. Reinforced plastics are made from both thermoplastic as well as thermosetting plastics

3.Pick�out�the�wrong�statement?
A. Wrought iron contains about 0.02% carbon
B. Wrought iron cannot be easily forged and welded
C. The chilled cast iron does not contain graphite
D. Spheroidal grey cast iron contains graphite flakes

4.Pick�out�the�correct�statement?
A. Stainless steel is nothing but chromium coated steel
B. Hardening of a soft metal can be done by alloying it with another metal or non-metal
C. Plastic deformation of a material is its temporary distortion under the action of applied stress
D. Rusting of iron is not electrochemical in nature

5.Pick�out�the�wrong�statemen?
A. Hardening makes the steel more brittle
B. High alloy steels contain more than 50% alloying element
C. 18/8 stainless steel is a magnetic steel
D. Both B. and C.

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