Latihan PTS Kelas 8

Rizal is building a simple LED circuit for his school project. What is the primary purpose of a resistor in his LED circuit?

• To increase the brightness of the LED.

• To store electrical energy for the LED.

• To limit the current flowing through the LED.

• To change the color of the LED.

Dewi is designing a traffic light system with three LEDs (red, yellow, green) for her school project. Which programming logic is most appropriate for her to use?

• Use a single LED that changes color based on a timer.

• Implement a random color selection for the LEDs.

• Use a loop to cycle through red, yellow, and green states.

• Turn on all LEDs simultaneously for visibility.

Rahman is tasked with creating a traffic light system for a school project using three LEDs (red, yellow, green). Which programming logic is most appropriate for him to use?

• Use a single LED that changes color based on user input.

• using analogWrite() for fading effects

• Control the LEDs with a timer that does not change states.

• using digitalWrite() with delay() to sequence LEDs

Agus decided to connect an LED directly to a power source without using a resistor while working on his science project. What is the effect of this action?

• The LED may burn out due to excessive current.

• The LED will not light up at all.

• The LED will glow brightly and function normally.

• The LED will change color unexpectedly.

In Sari's microcontroller-based traffic light system project, what is the role of a delay function?

• To increase the brightness of the LEDs.

• To pause the program execution for a specified time.

• To randomly change the LED colors.

• To reset the system after each cycle.

Titi is working on a project to create a decorative lamp using an LED. Which component is essential for controlling the brightness of the LED in her circuit?

• A diode to allow current flow.

• A transistor to amplify the signal.

• A potentiometer to adjust resistance.

• A capacitor to store energy.

Agus is working on a project where he needs to measure distances using an ultrasonic sensor. How is the HC-SR05 ultrasonic sensor typically connected to his Arduino?

• Connect VCC to 3.3V, GND to 5V, Trig to an analog pin, and Echo to another analog pin.

• Connect VCC to GND, GND to 5V, Trig to a digital pin, and Echo to the same digital pin.

• Connect VCC to 5V, GND to GND, Trig to a digital pin, and Echo to another digital pin.

• Connect VCC to 5V, GND to GND, Trig to a power pin, and Echo to a ground pin.

Eko is working on his Arduino project and needs to set a pin as either an input or output. Which command should he use?

• setPinMode(pin, state)

• configurePin(pin, direction)

• pinMode(pin, mode)

• definePin(pin, type)

Wawan is working on a project using the HC-SR 04 ultrasonic sensor. He needs to know what the mode of the trig pin is set to for his application.

• Analog mode

• PWM mode

• Input mode

• Output mode

During a robotics class, Adi is working with the HC-SR04 ultrasonic sensor. He needs to understand how the echo pin functions. What is the mode of the echo pin in HC-SR04?

• PWM mode

• Analog mode

• Input mode

• Output mode