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Practice each question, then open the answer or worked solution.
Choose from the options a, b, c and d given in Fig. 12.1, the figure which shows the correct direction of the current.
Ans: The correct answer is option (b).
In an electric circuit, current flow is measured from the positive terminal to the negative terminal of the electric cell.
Choose the incorrect statement.
Ans: The correct answer is option (a). In a circuit, the source of the electric current is a switch.
In an electric bulb, light is produced due to the glowing of
Ans: The correct answer is option (b) the thin filament. There is a thin filament present inside a bulb that glows and produces light.
In the following arrangement shown in Fig. 12.2, the bulb will not glow if the ends A and B are connected with
Ans: The correct answer is option (c) a plastic clip. Plastic is an insulator because it is a bad conductor of electricity.
In the circuit shown in Fig. 12.3, when the switch is moved to ‘ON’ position,
Ans: The correct answer is an option (d) all bulbs will glow together. As soon as the circuit is finished, the current will be discovered at every place in it.
Filament of a torch bulb is
Ans: The correct answer is option (d), a thin wire. The filament of the bulb is made of a thin wire made from tungsten.
Paheli is running short of connecting wires. To complete an electric circuit, she may use a
Ans: The correct answer is option (d) Steel spoon. Steel is an excellent electrical conductor.