Grade 11 Physics Quiz on Electronics

What are semiconductors primarily known for?

• Being perfect conductors of electricity

• Being only found in metals

• Having properties between conductors and insulators

• Being perfect insulators of electricity

What happens to some electrons in a semiconductor at room temperature?

• They lose their charge completely

• They form new atoms

• They gain enough thermal energy to be dislodged

• They become part of the nucleus

What is the function of a semiconductor diode?

• To store electrical energy

• To conduct current in both directions

• To increase the voltage

• To act as a switch or one-way valve

What is the forward voltage required for a diode to conduct current?

• 0.2 V

• 0.6 V

• 1.4 V

• 1.0 V

What do LEDs emit when current flows through them?

• Heat

• Sound

• Light

• Electricity

What happens to the resistance of an LDR as light increases?

• It increases

• It decreases

• It remains the same

• It fluctuates randomly

What is the behavior of a thermistor as temperature increases?

• Resistance increases

• Resistance decreases

• Resistance remains constant

• Resistance becomes infinite

In the example question, what is the safe voltage drop across the LED?

• 3.6 V

• 1.4 V

• 5.0 V

• 1.0 V

What is the required protective resistance for the LED to operate safely?

• 540 Ω

• 180 Ω

• 360 Ω

• 90 Ω