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Malleable cast iron is produced 1. By quick cooling of cast iron. 2. By adding magnesium to molten cast iron. 3. from white cost iron by annealing. Which of the above statements is/are correct?
Which variety of cast iron is obtained by melting cast iron with wrought iron scrap?
Which of the following statements regarding the ‘casting vote’ in the Parliament is/are correct ? 1. It is cast by the speaker or a person acting as such. 2. It is cast in addition to voting in the first instance. 3. It is cast in the case of equality of votes. 4. It is always cast to maintain the status quo. Select the correct answer using the code given below:
Which of the following statements are correct? 1. Steel and cast iron are multi-phase alloys. 2. Ferrite is a single phase interstitial solid solution of carbon in iron. 3. Wrought iron is a highly refined iron with a small amount of slag which gives resistance to progressive corrosion. 4. Stellite contains large amounts of metals like cobalt and tungsten resulting in high hardness. Select the correct answer using the code given below.
Which of the following are not chemical changes? 1. Tempering of iron 2. Conversion of the iron piece into an electro-magnet by passing the current around the iron 3. Melting of iron 4. Rusting of iron Select the correct answer using the code given below:
Out of the total production of iron from hematite, an ore of Iron, 20% of the ore gets wasted, and out of the remaining iron, only 25% is pure iron. If the pure iron obtained in a year from a mine of hematite was 80,000 kg, then the quantity of hematite mined from that mine in the year is
Which of the following statements are true with respect to iron ore?
I. Limestone and coal are important for smelting iron ore
II. More than 20% of the world iron ore deposits are in India
III. Odisha and Jharkhand top in the production of iron ore
IV. Iran is the largest buyer of Indian iron ore
When filing or machining cast iron makes our hands black, then it shows that ________ is present in cast iron.
White cast iron as compared to grey cast iron is
When carbon in the cast iron is principally in the form of graphite, the cast iron will be of