Understanding Thermistors and LDRs in Circuits

What component helps a phone detect when it is too hot?

• Resistor

• Capacitor

• LDR

• Thermistor

What happens to the resistance of an LDR when the light intensity is high?

• It fluctuates

• It decreases

• It remains the same

• It increases

Which component in the circuit changes its resistance based on light intensity?

• Thermistor

• LDR

• Fixed resistor

• Capacitor

In bright conditions, what is the potential difference across the lamp if the LDR has low resistance?

• Equal to the power source

• Zero

• Low

• High

What is the role of a fixed resistor in the circuit with an LDR?

• To measure temperature

• To change the light intensity

• To control the current

• To provide power

What happens to the lamp's brightness when the potential difference across it is low?

• It becomes brighter

• It dims

• It remains the same

• It turns off

What is the potential difference across the LDR in bright conditions?

• High

• Low

• Zero

• Equal to the lamp

When it is dark, what happens to the resistance of the LDR?

• It decreases

• It remains constant

• It becomes zero

• It increases

How does the potential difference across the lamp change when the LDR's resistance increases in the dark?

• It remains the same

• It decreases

• It becomes zero

• It increases

Which of the following is a real-life application of an LDR?

• Television remote

• Electric fan

• Mobile phone battery

• Street lights