A light-dependent resistor $\mathbf{(LDR)}$ is a device whose resistance changes with:

When the intensity of light falling on an $\mathbf{LDR}$ increases, its resistance:

An $\mathbf{LDR}$ is commonly made from materials that are:

In darkness, an$\mathbf{\ }\mathbf{LDR}$ usually has:

A student covers an$\mathbf{\ }\mathbf{LDR}$ with a dark cloth. The resistance of the $\mathbf{LDR}$ will:

Which change will cause the current through an $\mathbf{LDR}$ circuit to increase (assuming constant voltage)?

Which graph correctly represents the relationship between light intensity and $\mathbf{LDR}$ resistance?

The working principle of an $\mathbf{LDR}$ is based on:

An $\mathbf{LDR}$ is placed near a bright lamp. Compared with its value in darkness, its resistance will be:

Which device commonly uses an $\mathbf{LDR}$?

In an automatic lighting system, an $\mathbf{LDR}$ switches lights $\mathbf{ON}$ at night because:

Increasing the intensity of light on an $\mathbf{LDR}$ causes:

The resistance of an $\mathbf{LDR}$ is highest when it is:

If the resistance of an $\mathbf{\ }\mathbf{LDR\ }$ decreases due to increased light intensity, its conductivity:

An $\mathbf{LDR}$ and a fixed resistor are connected in a voltage divider circuit. Increasing light intensity on the $\mathbf{LDR}$ will mainly change:

Which statement about an $\mathbf{LDR}$ is correct?

Two identical $\mathbf{LDRs}$ are placed under different light conditions. $\mathbf{LDR\ A}$ is under bright light and $\mathbf{LDR\ B}$ is in darkness. Which is true?

A student wants an $\mathbf{LDR}$ to detect small changes in light intensity. The best condition is:

When light intensity increases on an $\mathbf{LDR}$, the number of free electrons:

An $\mathbf{LDR}$ differs from an ordinary resistor because:

A circuit containing an $\mathbf{LDR}$ is placed from daytime into darkness. The current in the circuit will generally:

The main purpose of using an $\mathbf{LDR}$ in electronic circuits is to:

A bright flashlight is directed at an $\mathbf{LDR}$. Which combination is correct?

If the light intensity falling on an $\mathbf{LDR}$ is reduced, the resistance:

In an $\mathbf{LDR}$, light energy affects resistance by changing the:

An $\mathbf{LDR}$ is most suitable as a sensor in:

If the resistance of an $\mathbf{LDR}$ decreases from $\mathbf{10\ k\Omega}$ to $\mathbf{1\ k\Omega}$, this indicates:

Which factor does NOT directly control the resistance of an $\mathbf{LDR}$?

The relationship between light intensity and resistance of an $\mathbf{LDR}$ is generally:

A student observes that an$\mathbf{\ \ }\mathbf{LDR\ }\mathbf{\ }$has a very high resistance. The most likely condition is:

In a security system, an $\mathbf{LDR}$ detects when a beam of light is interrupted. When the beam is blocked, the $\mathbf{LDR}$ resistance:

The sensitivity of an$\mathbf{\ }\mathbf{LDR\ }$refers to its ability to:

Which statement best explains why $\mathbf{LDRs}$ are called photo-resistors?

A decrease in $\mathbf{LDR}$ resistance due to light exposure results in:

Which graph would show the correct behavior of an $\mathbf{LDR}$?