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Consider the following statements in respect of a vapour-absorption refrigeration cycle: 1. The absorption refrigeration cycle is generally used when waste heat is a available from an existing source or when free energy like solar energy is to be used. 2. There are no moving parts in the absorption refrigeration plant except a small liquid pump. 3 the value of the coefficient of performance is nearly the same in both vapour-absorption and vapour-compression refrigeration plants. Which of the above statements are correct?
Which of the following statements about physical absorption are correct? Statement 1: Example for physical absorption is the absorption of carbon dioxide into water. Statement 2: Polar interactions between water and the molecules of the solid play an important role in physical absorption.
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
Absorption of dietary Iron is enhanced by:
Consider the following statements regarding vapour absorption systems in the field of refrigeration: 1. In ammonia-water absorption system, ammonia is the refrigerant. 2. In water-lithium bromide system, water is the refrigerant. 3. Ammonia-water absorption reaction is endothermic. 4. The amount of ammonia absorbed by water is inversely proportional to the temperature of ammonia. Which of the above statements are correct?
Avinash bought an iron at some price, later he sold it to Praveen at 10% profit. However Praveen damage the iron and spent Rs.1500 for it's repairing and later sold it to Piyush at a loss of 25%. What is the price at which Avinash brought the Iron, such that if he directly sold the iron to Piyush he would have gained a profit of 5%?
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?
Parth had the cylindrical iron piece. He drilled out a conical cavity from the iron piece. The height and radius of the conical cavity is 15 cm and 8 cm respectively which is equal to the eight and radius of cylindrical iron piece. Find the total surface area of the remaining cylindrical iron piece.