Test: Electricity: Circuits and their Components - Class 7 MCQ

Electric current moves from the positive terminal to the negative terminal in a circuit. This is the conventional flow of current.

Circuit diagrams show how the components in a circuit are connected, helping engineers and electricians understand how electricity flows through the circuit.

Copper is a conductor, meaning it allows electricity to flow. Rubber, plastic, and glass are insulators, which block the flow of electricity.

When the filament inside an incandescent lamp breaks, the circuit is broken, and the lamp stops glowing.

Copper is a good conductor of electricity, which is why it is used in electrical wires. Rubber and plastic are insulators, not conductors.

DC flows in only one direction, while AC changes direction regularly. AC is used in home appliances, while DC is used in batteries.

If an incandescent lamp is described as "fused," it means the filament inside is broken, which stops the lamp from glowing.

In circuit diagrams, a straight line represents a wire, which connects different components in the circuit.

Insulators prevent the flow of electricity, protecting users from electric shocks. They cover conductive materials like wires to keep electricity contained.

An LED lamp glows only when connected with the correct polarity (positive to positive, negative to negative). This makes LEDs more energy-efficient compared to incandescent bulbs.

Electric cell is the component that is essential for making a LED lamp glow in a circuit. It provides the necessary power to the LED. Without an electric cell, the LED will not light up.

LEDs need to be connected with the correct polarity (positive to positive, negative to negative) to work. This makes them more durable and energy-efficient.

The terminals on an electric cell are the connection points that allow current to flow into and out of the cell.

Electric wires carry the electric current between different components of the circuit, making the circuit complete.

An electric cell provides electrical energy, which powers devices like flashlights, clocks, and other battery-operated items.

Alternating Current (AC) is supplied to wall sockets because it can be easily transmitted over long distances, making it suitable for powering large appliances.

A switch controls the flow of electricity by either opening or closing the circuit. When the switch is off, the circuit is open and current doesn’t flow.

A battery is essentially a combination of two or more electric cells connected to provide a greater voltage or longer-lasting energy supply. This setup is commonly used in various devices, from remote controls to vehicles.

The lamp in a torchlight produces light when the electric current flows through it.

When the switch is off, the circuit is open and the current stops flowing. This stops the flow of electricity to the devices.