Breadboard Basics & Circuit Connections – MCQs (Grades 7, 8)

What is a breadboard used for?

• Eating bread

• Building and testing electrical circuits without soldering

• Measuring battery voltage

• Painting electronic parts

What are the two main parts of a breadboard?

• Power rails and terminal strips

• Power plugs and switches

• Motors and LEDs

• Batteries and magnets

What is the purpose of power rails on a breadboard?

• To connect LEDs

• To provide power (+ and –) to the whole circuit

• To hold wires in place

• To increase battery life

How are holes connected on a terminal rail?

• Vertically

• Randomly

• Horizontally in rows of 5

• Diagonally

What happens if you connect an LED directly across a 3V battery in the wrong direction?

• The LED will glow brighter

• The LED will not glow

• The battery will explode

What is the “bridge gap” in a breadboard?

• The center space separating left and right terminal rails

• A bridge made of jumper wires

• The metal strip under the power rail

• The connection for the power supply

What does a push button do in a breadboard circuit?

• Controls whether electricity flows through the circuit or not

• Makes the LED blink automatically

• Stores energy

• Changes the brightness of the LED

What happens when you bring a magnet near a reed switch connected to a circuit?

• The LED turns off

• The LED turns on as the switch closes

• The battery disconnects

• The circuit breaks permanently

Why is a reed switch special compared to a push button?

• It works automatically without touching it — using a magnet

• It changes colors

• It produces sound

• It increases battery power