Q. What will happen if a fully filled can of soda is placed in the freezer? (a) The level of fluid in the can after freezing decreases. (b) It may explode in the freezer. (c) There will be no effect after freezing of fluid in bottle. (d) The can of soda shrinks in the freezer. After freezing, volume of water increases, around 9%. Hence soda can may explode in freezer.
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Q. Which of the following Steel is used for making bulldozer tip? 1. High Carbon Steel 2. Inconel 3. Rimmed Steel h 4. Hadfield Steel Steel with 12% manganese is exceptionally very strong and known as Hadfield steel
Q. Which of the falling loss is / are not useful in governing of laws of chemical combination? 1. Law of conservation of mass 2. Law of Definite proportions. 3. Law of multiple proportion. 4. Gay Lussac's law of gaseous volume. 5. Avogadro's law Select the correct answer using the codes given below: (a) 4 and 5 only (b) 1 2 and 3 only. (c) 5 only. (d) None of these
Q.3 Statement (I): Mechanically, pearlite has properties intermediate between the soft ductile ferrite and the hard brittle cementite. Statement (1) : Alpha iron can be made magnetic above 768 C. (a) Both Statement () and Statement (lI) are individually true and Statement (Il)is the correct explanation of Statement (l) (b) Both Statement () and Statement (l)are individually true, but Statement (I) is not the correct explanation of Statement (I) (c) Statement (I) is true, but Statement (Il) is false (d) Statement () is false, but Statement (Il) is true [ESE 2018] Ans. (c) Alpha iron is magnetic below 768 C (Curie temperature). Hence statement Il is wrong.
The combination of elements to form compounds is governed by the following five basic laws 1. Law of conservation of mass 2. Law of definite proportions 3. Law of multiple proportions 4. Gay Lussac's law of gaseous volumes 5. Avogadro's law
Q. Which of the following statements are true regarding nemonic alloy? 1. Nemonic alloy consist of Nickel more than 50% and chromium 20% with additives such as Titanium and Aluminium 2. These are high temperature low creep super alloys. 3. These alloys cannot be used in gas turbine components. Select the correct answer using the codes given below: (a) 1 and 2 only (b) 1 and 3 only. (d) 12 and 3 (c) 2 and 3 only Nimonic alloys refers to a family of nickel based high temperature low creep superalloys. Nimonic alloys consist of more than 50% nickel and 20% chromium with additives such as titanium and These alloys are mainly used in gas turbine components and high performance reciprocating internal combustion engine.
Q. Which of the following is / are true for fibres in composite materials? 1. For most of the materials a small diameter fibre is weaker than the bulk metal 2. Material that are classified as fibre are either polycrystalline or amorphous. Select the correct answer using the codes given below: (a) 1only (b) 2 only (c) both 1 and 2 (d) neither 1 nor 2 For most of materials a small diameter fiber is much stronger than the bulk material. The probability of the presence of a critical surface flaw that can lead to fracture diminishes with decreasing specimen volume.
Q.1 Statement (): Manganese is always added to steels since it combines with the sulphur content to form manganese sulphide. Statement (II): If manganese is not added, iron sulphide which is not harmful for steel, would form. (a) Both Statement () and Statement(I) are individually true and Statement (ll) is the correct explanation of Statement () (b) Both Statement () and Statement (Il)lare ndividually true but Statement (l)is not the correct explanation of Statement (1) (c) Statement () is true but Statement (l) is false (d) Statement () is false but Statement (ll) is true ESE: 2017] Ans. (c) If manganese is not added, iron sulphide is formed which develops crack in of iron sulphide is harmful. Hence statement (I) is false.
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