Class 7 Physics: Electricity - Dry Cell Puzzles
Test your understanding of dry cells with these engaging puzzles. Click to reveal hints and answers!
Puzzle 1
What is the purpose of a dry cell in an electric circuit?
Hint: It provides energy for the circuit.
Answer: A dry cell acts as a source of electrical energy by converting chemical energy into electrical energy.
Puzzle 2
What type of energy conversion takes place in a dry cell?
Hint: Think about the source and output of energy in the cell.
Answer: Chemical energy is converted into electrical energy.
Puzzle 3
What is the function of the electrolyte in a dry cell?
Hint: It helps in the flow of ions.
Answer: The electrolyte facilitates the flow of ions between electrodes to generate electricity.
Puzzle 4
Name the two electrodes in a dry cell.
Hint: One is positive, and the other is negative.
Answer: The two electrodes are the carbon rod (positive terminal) and the zinc casing (negative terminal).
Puzzle 5
In which direction does the current flow in a circuit connected to a dry cell?
Hint: It flows from one terminal to the other.
Answer: The current flows from the positive terminal (carbon rod) to the negative terminal (zinc casing).
Puzzle 6
What material is used as the positive electrode in a dry cell?
Hint: It is a non-metal rod.
Answer: The positive electrode is made of carbon, in the form of a graphite rod.
Puzzle 7
What surrounds the positive electrode in a dry cell to prevent leakage?
Hint: It is a paste-like substance.
Answer: The positive electrode is surrounded by a moist paste of ammonium chloride and manganese dioxide.
Puzzle 8
Which terminal of the dry cell is the zinc casing connected to?
Hint: It is the terminal that gives electrons to the circuit.
Answer: The zinc casing is connected to the negative terminal of the dry cell.
Puzzle 9
What happens to the zinc casing as the dry cell is used?
Hint: It participates in the reaction inside the cell.
Answer: The zinc casing gets consumed in the chemical reaction, leading to its gradual corrosion.
Puzzle 10
Why is a dry cell called "dry"?
Hint: Think about the nature of its electrolyte.
Answer: A dry cell is called "dry" because its electrolyte is in the form of a moist paste, not a liquid.
