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Class 10 Case Study Based Board Questions

Science 2025

Case Study 1
Case Study – 1

Concept Based Electricity.

In our homes, we receive the supply of electric power through a main supply...

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Case Study 1
Case Study – 2

Concept Based Acids, Bases and Salts.

Seawater contains many salts dissolved in it. Common salt is separated from...

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Case Study 1
Case Study – 3

Concept Based How do Organisms Reproduce?

The maintenance functions of all living organisms must go on even when they...

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Case Study – 1

In our homes, we receive the supply of electric power through a main supply also called mains, either supported through overhead electric poles or by underground cables. In our country the potential difference between the two wires (live wire and neutral wire) of this supply is 220 V.

Answer the following questions:

  1. Write the colours of the insulation covers of the line wires through which supply comes to our homes.
  2. What should be the current rating of the electric circuit (220 V) so that an electric iron of 1 kW power rating can be operated ?
  3. (a) What is the function of the earth wire ? State the advantage of the earth wire in domestic electric appliances such as electric iron.
            OR
    (b) List two precautions to be taken to avoid electrical accidents. State how these precautions prevent possible damage to the circuit/appliance.

Case Study – 2

Seawater contains many salts dissolved in it. Common salt is separated from these salts. Deposits of solid salt are also found in several parts of the world. These large crystals are often brown due to impurities. This is called rock salt and is mined like coal. The common salt is an important raw material for chemicals of daily use.

Answer the following questions:

  1. Write balanced chemical equations to show the products formed during electrolysis of brine.
  2. List two uses of any one product obtained during electrolysis of brine.
  3. (a) A mild non-corrosive basic salt ‘A’, used for faster cooking, is strongly heated to produce a compound ‘B’, that is used for removing permanent hardness of water. Identify A and B and also write the equation for the reaction that occurs when A is heated
           OR
    (b) Define water of crystallisation. Give two examples of salts that have water of crystallisation.

Case Study – 3

The maintenance functions of all living organisms must go on even when they are not doing anything particular. Even when we are just sitting in a class or even asleep, this maintenance job has to go on. These maintenance processes require energy to prevent damage and break-down of cells and tissues, which is obtained by the individual organism from the food prepared by the autotrophs, called producers.

Answer the following questions:

  1. Name and define the process by which green plants prepare food.
  2. Write chemical equation involved in the above process.
  3. (a) State in proper sequence the events that occur in synthesis of food by desert plants.
           OR
    (b) Explain giving reasons what happens to the rate at which the green plants will prepare food
    (I) during cloudy weather, and
    (II) when stomata get blocked due to dust.