HARD
7th Tamil Nadu Board
IMPORTANT
Earn 100

Explain the construction and working of a dry cell.

Important Questions on Electricity

HARD
7th Tamil Nadu Board
IMPORTANT
Tamil Nadu Board Class 7 Science Term 2>Chapter 2 - Electricity>Evaluation>Q X
A student made a circuit by using an electric cell, a switch, a torch bulb (fitted in the bulb holder) and copper connecting wires. When he turned on the switch, the torch bulb did not glow at all. The student checked the circuit and found that all the wire connections were tight. What could be the possible reason for the torch bulb not glowing even when the circuit appears to be complete?
MEDIUM
7th Tamil Nadu Board
IMPORTANT
Tamil Nadu Board Class 7 Science Term 2>Chapter 2 - Electricity>Evaluation>Q XI

Three conductors are joined as shown in the diagram. The current in conductor RS is 10 A. The current in conductor QR is 6 A. What will be the current in conductor PR. 

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EASY
7th Tamil Nadu Board
IMPORTANT
Tamil Nadu Board Class 7 Science Term 2>Chapter 2 - Electricity>Evaluation>Q XI

Draw the circuit diagram for the following series connection.

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HARD
7th Tamil Nadu Board
IMPORTANT
Tamil Nadu Board Class 7 Science Term 2>Chapter 2 - Electricity>Evaluation>Q XI

Study the electric circuit below. Which of the following switches should be closed so that only two bulbs will light up.

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HARD
7th Tamil Nadu Board
IMPORTANT
Tamil Nadu Board Class 7 Science Term 2>Chapter 2 - Electricity>Evaluation>Q XI

Study the three electric circuits below. Each of them has a glass rod (G), a steel rod (S), and a wooden rod (W). In which of the electric circuits would the bulb not light up.

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