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1.	What is weathering steel?(a) low-alloy atmospheric corrosion-resistant steel(b) low-carbon steel(c) high strength quenched and tempered steel(d) fire resistant steelI got this question during an online exam.The query is from Types of Steel in portion Materials, Structures and Specifications of Design of Steel Structures
Answer» CORRECT CHOICE is (a) low-alloy ATMOSPHERIC corrosion-resistant steel For explanation: Weathering steel are low-alloy atmospheric corrosion-resistant steel. They are often LEFT unpainted. They have an ultimate tensile strength of 480 MPa.

2.	What is the minimum percentage of chromium and nickeladded to stainless steel?(a) 0.5%, 10.5%(b) 2%, 20%(c) 10.5%, 0.5%(d) 30%, 50%I have been asked this question in an interview for internship.This is a very interesting question from Types of Steel topic in division Materials, Structures and Specifications of Design of Steel Structures
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3.	Fire resistant steels are also called as ____________(a) Stainless steel(b) Weathering steel(c) High strength steel(d) Thermomechanically treated steelThis question was posed to me in class test.Enquiry is from Types of Steel topic in section Materials, Structures and Specifications of Design of Steel Structures
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4.	High carbon steel is used in ______________(a) transmission lines and microwave towers(b) structural buildings(c) fire resistant buildings(d) for waterproofingThe question was asked in quiz.I need to ask this question from Types of Steel in section Materials, Structures and Specifications of Design of Steel Structures
Answer» Correct choice is (a) transmission lines and MICROWAVE TOWERS The explanation is: HIGH carbon steel is used in transmission lines and microwave towers where relatively light MEMBERS are joint by BOLTING.

5.	What is the permissible percentage of micro-alloys in medium and high strength micro-alloyed steel?(a) 0.1%(b) 0.5%(c) 0.25%(d) 1.0%I got this question during an interview.The query is from Types of Steel topic in division Materials, Structures and Specifications of Design of Steel Structures
Answer» Right choice is (c) 0.25% Best explanation: MEDIUM and High strength micro-alloyed steel have LOW carbon content, but ALLOYS such as NIOBIUM, VANADIUM, titanium or boron are added to achieve high strength.

6.	Which of the following is the property of high carbon steel?(a) high toughness(b) reduced ductility(c) high strength(d) reduced strengthThis question was posed to me in a job interview.My question is based upon Types of Steel in section Materials, Structures and Specifications of Design of Steel Structures
Answer» Correct answer is (B) reduced ductility The EXPLANATION is: High carbon STEEL contains high carbon content. Hence it has reduced ductility, TOUGHNESS and WELDABILITY.

7.	Chrome and Nickel are added to Steel to improve _________(a) corrosion resistance and high temperature resistance(b) strength(c) ductility(d) weldablityThe question was asked in a job interview.My question is based upon Properties of Steel topic in portion Materials, Structures and Specifications of Design of Steel Structures
Answer» Right OPTION is (a) corrosion resistance and high temperature resistance Explanation: STEEL is WEAK in fire and corrosion resistance. So, to IMPROVE corrosion resistance and high temperature resistance, CHROMIUM and nickel are added to steel.

8.	Which of the following is added to steel to increase resistance to corrosion?(a) Carbon(b) Manganese(c) Sulphur(d) CopperThis question was addressed to me by my school principal while I was bunking the class.My question is taken from Properties of Steel topic in chapter Materials, Structures and Specifications of Design of Steel Structures
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9.	Which of the following is the effect of increased content of Sulphur and Phosphorous in Steel ?(a) yields high strength(b) affects weldability(c) increases resistance to corrosion(d) improves resistance to high temperatureI had been asked this question at a job interview.Question is from Properties of Steel topic in portion Materials, Structures and Specifications of Design of Steel Structures
Answer» CORRECT choice is (b) AFFECTS WELDABILITY To elaborate: When sulphur and phosphorous is used BEYOND 0.06%, it IMPARTS brittleness and affects weldability and fatigue strength.

10.	What happens when Manganese is added to steel?(a) decreases strength and hardness of steel(b) improves corrosion resistance(c) decreases ductility(d) improves strength and hardness of steelThe question was posed to me by my school teacher while I was bunking the class.Origin of the question is Properties of Steel topic in division Materials, Structures and Specifications of Design of Steel Structures
Answer» The correct option is (d) improves STRENGTH and hardness of steel Best explanation: MANGANESE is added to improve strength and hardness of steel . Based on Manganese CONTENT, steel are classified as Carbon Manganese steel (Mn >1%) and Carbon Steel (Mn <1%). If its content exceeds 1.5%, it increases the FORMATION of martensite and hence decreases ductility and toughness.

11.	Structural Steel normally has carbon content less than _______(a) 1.0%(b) 0.6%(c) 3.0%(d) 5.0%I have been asked this question in examination.I'd like to ask this question from Properties of Steel in division Materials, Structures and Specifications of Design of Steel Structures
Answer» The correct choice is (B) 0.6% The best explanation: Structural Steelnormally have a carbon content LESS than 0.6%. Carbon content INCREASES hardness, yield and TENSILE strength of steel but it DECREASES ductility and toughness.

12.	What is the permissible percentage of Sulphur and Phosphorous content in steel?(a) 0.1%, 0.12%(b) 1.0%, 3.0%(c) 3.0%, 1.0%(d) 1.0%, 1.0%The question was asked in class test.This intriguing question originated from Properties of Steel in chapter Materials, Structures and Specifications of Design of Steel Structures
Answer» RIGHT answer is (a) 0.1%, 0.12% To EXPLAIN: Sulphur CONTENT is generally between 0.02 – 0.1%. If more than 0.1%, it decreases strength and ductility of steel. If PHOSPHOROUS is more than 0.12%, it reduces shock resistance, ductility and strength of steel.

13.	Poisson’s ratio of steel is ________(a) 0.1(b) 1.0(c) 0.3(d) 2.0This question was posed to me during an online exam.The origin of the question is Properties of Steel topic in chapter Materials, Structures and Specifications of Design of Steel Structures
Answer» The correct OPTION is (c) 0.3 Easy explanation: POISSON’s ratio = transverse strain/axial strain. As PER IS 800-2007, Poisson’s ratio of steel is 0.3 in ELASTIC RANGE and it is 0.5in plastic range.

14.	Unit mass of Steel = ________(a) 785 kg/m^3(b) 450 kg/m^3(c) 450 kg/cm^3(d) 7850 kg/m^3I have been asked this question in an interview.This interesting question is from Properties of Steel topic in chapter Materials, Structures and Specifications of Design of Steel Structures
Answer» RIGHT answer is (d) 7850 kg/m^3 Explanation: As per IS 800-2007, unit mass of STEEL is 7850 kg/m³. A steel member with small section which has little self-weight is able to RESIST heavy loadsbecause steel MEMBERS have high STRENGTH per unit weight.

15.	Elastic Modulus of Steel is __________(a) 1.5 x 10^9 N/mm^2(b) 2.0 x 10^5 N/mm^2(c) 2.0 x 10^5 N/m^2(d) 1.5 x 10^9 N/m^2This question was posed to me in homework.This is a very interesting question from Properties of Steel in portion Materials, Structures and Specifications of Design of Steel Structures
Answer» CORRECT choice is (B) 2.0 x 10^5 N/mm^2 For explanation I WOULD say: Elastic MODULUS = Stress/Strain. As per IS 800-2007, elastic modulus of steel is 2.0 x 10⁵ N/mm².

16.	Steel is mainly an alloy of(a) Iron and Carbon(b) Sulphur and Zinc(c) Zinc and tin(d) Phosphorous and TinI have been asked this question in a job interview.I want to ask this question from Properties of Steel in division Materials, Structures and Specifications of Design of Steel Structures
Answer» The correct CHOICE is (a) Iron and Carbon The best I can explain: Steel is alloy of iron and carbon. Apart from carbon, a SMALL percent of manganese, sulphur, phosphorous, chrome, nickel, and copper are added to GIVE special PROPERTIES to steel.

17.	Which of the following is adisadvantage of Steel?(a) High strength per unit mass(b) High durability(c) Fire and corrosion resistance(d) ReusableThis question was addressed to me in an interview.This intriguing question comes from Properties of Steel topic in portion Materials, Structures and Specifications of Design of Steel Structures
Answer» RIGHT option is (c) Fire and CORROSION resistance The explanation is: STEEL has high strength PER unit mass, highly DURABLE, and is reusable. But steel is poor in fire and corrosion resistance, it needs to be protected.