Light Dependent Resistors (LDRs) Quiz

What fundamental property of an LDR changes when exposed to light?

• Voltage
• Current
• Resistance
• Capacitance

In a dark environment, an LDR typically has:

• Low resistance
• Medium resistance
• High resistance
• Zero resistance

According to Ohm's Law, which equation correctly represents the relationship between voltage, current, and resistance?

• R = V ÷ I
• V = I × R
• I = V ÷ R
• V = R × I

When light intensity increases in an LDR circuit, what happens to the current?

• Current decreases
• Current remains constant
• Current increases
• Current becomes zero

Which of the following is NOT a typical real-world application of LDRs?

• Automatic street lighting
• Camera light meters
• Refrigeration control
• Solar tracking systems

In a bright light environment, an LDR typically has:

• High resistance
• Medium resistance
• Low resistance
• Infinite resistance

What instrument would you use to measure voltage across an LDR?

• Ammeter
• Ohmmeter
• Voltmeter
• Multimeter

Which electronic characteristic of an LDR changes with light exposure?

• Inductance
• Capacitance
• Resistance
• Conductance

An LDR is connected in a circuit with a 1.5 V source. If the resistance decreases, what happens to the current?

• Current decreases
• Current increases
• Current remains constant
• Current becomes zero

Which technology might use an LDR for automatic brightness adjustment?

• Desktop computer
• Smartphone
• Microwave oven
• Electric kettle