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Lactose, whey proteins and milk salts have less contribution towards the viscosity of milk compared with the casein which alone is contributing substantially towards this property.
Indian milk market contains two types of products cow’s milk and buffalo’s milk. Commercial milk should have 80% milk. The cost of commercial milk of cow and buffalo cost Rs. 20 and Rs. 15 per liter respectively. At market both can be sold at 60% profit. A milkman who sells 70% milk as 80% and also mixes cow and buffalo in the ratio 3 ∶ 4 and sells it as cow milk. What is the profit (%) he earns?
A milk seller bought certain quantity of pure milk. He first sold 20 litres of pure milk. He added 20 litres of water to the remaining quantity of milk. He then sold 20 litres of the milk water mixture and added 20 litres of water to the mixture. He again sold 20 litres of this milk water mixture and added 20 litres of water to the mixture. Now, the ratio of milk to water is 8 : 19. How much quantity of pure milk in litres did he buy in the first place?
A 60% spirit solution is mixed with r% spirit solution in the ratio 1 : 3 such that a s% spirit solution is obtained. When a (s/3)% spirit solution is mixed with 55% spirit solution in equal ratio, an (r/2)% spirit solution is obtained. Which of the following can be determined? (A) Value of ‘r’ (B) Value of ‘s’ (C) Volume of the 60% spirit solution mixed initially (D) If 9 liters of r% spirit solution was mixed initially, what was the volume of the s% spirit solution thus obtained?
A milk solution of 80 litres contains 60% milk. How many litres of another milk solution containing 85% milk should be added to make a 75% milk solution?
There is a 40 litre solution of milk and water with concentration of milk as 30%. 10 litres of the solution is replaced with 10 litres of water. After some time, 10 litres of the new solution is replaced with 10 litres of milk. What is the concentration of milk in the solution now?
A chemical solution appears green when the salt concentration is 8 grams per litre (gpl) and red when it is 10 gpl. Pure water was added to the solution of 1 litre of 15 gpl solution till it turned green. Then 125 ml of the green solution is taken out and x grams of salt is added to the green solution to make it red. Another 500 ml of the final solution was taken out and y litres of green solution is added to get a resultant solution of concentration 9.6 gpl.  Assume adding salt doesn’t change its volume and find the ratio of x and y. 
Milk is a colloidal system. It is stabilised by casein, a lyophilic colloid. In milk-
The question given below consists of a statement and/or a question and two statements numbered l and ll given below it. You have to decide whether the data provided in the statement(s) is sufficient to answer the question. What is the quantity of the milk in 120 litres of a mixture of milk and water? l. If 12 litres of water is added to the mixture, then the ratio of the quantity of milk to that of the water would be 8 : 3 ll. 20 litres of the solution is taken out and replaced with pure milk, then the ratio of the quantity of milk to that of water in the solution would be 5 : 1.
The whey proteins in milk constitute about _____% of the protein found in milk.