Question : When milk is converted into curd, which type of change is it?
Option 1: Reversible change
Option 2: Physical change
Option 3: Isothermal change
Option 4: Chemical change
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Correct Answer: Chemical change
Solution : The correct option is Chemical change.
When milk is converted into curd, it is a chemical change. This transformation involves the fermentation of milk by beneficial bacteria, such as Lactobacillus, which consume the lactose (milk sugar) and produce lactic acid. The production of lactic acid changes the composition and properties of the milk, giving it a thicker texture and a sour taste, which are characteristic of curd or yoghurt. This chemical change is irreversible, as you cannot easily revert curd into milk with the same properties it had before the transformation.
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Question : Directions: Which of the given responses would be a meaningful order of the following words? 1. Curd 2. Milk 3. Buttermilk 4. Cow 5. Ghee 6. Butter
Option 1: 2, 5, 6, 4, 1, 3
Option 2: 4, 6, 2, 1, 3, 5
Option 3: 4, 2, 1, 3, 6, 5
Option 4: 2, 6, 4, 5, 3, 1
Question : One litre of milk costs INR 40. Water is mixed with milk and the mixture cost becomes INR 30 per litre. Find the ratio of water and milk in the mixture.
Option 1: 2 : 5
Option 2: 1 : 3
Option 3: 1 : 2
Option 4: 2 : 3
Question : By which of the following processes is a solid substance directly converted into gas?
Option 1: Deposition
Option 2: Sublimation
Option 3: Vaporisation
Option 4: Fusion
Question : Directions: Which of the following interchange of signs would make the given equation correct? 28 – 7 + 2 × 2 = 0
Option 1: Change + into ×
Option 2: Change × into +
Option 3: Change – into +
Option 4: Change + into –
Question : When milk is churned, the cream separates from it due to:
Option 1: Frictional force
Option 2: Centrifugal force
Option 3: Gravitational force
Option 4: Viscous force
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