SCI_NAV_SECOND TERM_2

Which of the following materials do not allow electric current to flow through them?

• Plastic

• Copper

• Rubber

• Glass

Why can human beings conduct electricity?

• Due to the water in their bodies

• Due to the air they breathe

• Due to the food they eat

• Due to the clothes they wear

What happens when the circuit is complete?

• The bulb lights up

• The bulb turns off

• The bulb changes color

• The bulb explodes

Why are connecting wires covered with insulators like plastic?

• To increase conductivity

• To prevent electric shocks

• To make them more flexible

• To reduce the cost

What type of material are the handles of tools used by electricians made of?

• Metal

• Rubber

• Plastic

• Wood

What materials allow electric current to flow through them?

• Plastic

• Wood

• Metals

• Glass

What components are used in a simple electric circuit to demonstrate the flow of electric current?

• Resistor, capacitor, inductor

• Cell, key, connecting wires, bulb

• Microcontroller, sensor, actuator

• Transistor, diode, integrated circuit

What happens when the key in the electric circuit is closed?

• Current flows through the circuit
• The battery dies
• The light turns off
• The circuit breaks

Why does the bulb not light up when one of the connecting wires is cut?

• The bulb is faulty and needs to be replaced.
• The circuit is broken, so electricity cannot flow through to light up the bulb.
• The wire is too long, causing a delay in electricity reaching the bulb.
• The room is too bright, so the bulb's light is not noticeable.

What allows the bulb to light up again after one of the connecting wires is cut?

• Short circuit
• Parallel circuit
• Series circuit
• Open circuit