DT 8th Computer Science

In a block-based program, an "if-then" block is used to control an LED. The block is as follows:

If the light is greater than 500, then turn on the LED.  

What will happen if the light is less than 500? 

• The LED will turn on

• The LED will turn off

• Nothing will happen

• The program will stop

In an Arduino program, a PIR motion sensor is used to detect movement. The program code is as follows:

if (movement == HIGH) { activateAlarm(); }  

What does the condition "movement == HIGH" mean? 

• There is no movement

• Movement has been detected

• The alarm is deactivated

• The sensor is broken

In an Arduino project, a light sensor (LDR) is used to detect light intensity. The program code is as follows:

if (light < 300) { turnOnLED(); }  

What will happen if the light intensity is greater than 300? 

• The LED will turn on

• The LED will turn off

• The LED will blink

• Nothing will happen

In a block-based program, a "repeat" block is used to execute a set of instructions multiple times.

The block is as follows: Repeat 5 times {turn on the LED}  

What will happen after the instructions are executed 5 times? 

• The LED will turn off

• The LED will turn on permanently 

• The program will stop

• The instructions will be executed again

In an Arduino project, a light sensor is used to control an LED. The program code is as follows:

if (light > 500) { digitalWrite(LED, HIGH); }  

What will happen if the value of "light" is 300? 

• The LED will turn on

• The LED will turn off

• Nothing will happen

• The program will stop

In a block-based program, an "if-then" block is used to control a motor. The block is as follows:

If the temperature is greater than 30, then turn on the motor.  

What will happen if the temperature is 25? 

• The motor will turn on

• The motor will turn off

• Nothing will happen

• The program will stop

In a block-based program, a "wait" block is used to pause the program for a certain amount of time.
The block is as follows: Wait 2 seconds.  
What will happen after 2 seconds have passed? 

• The program will stop

• The program will continue running

• The instructions will be executed again

• The LED will turn on permanently

In a technology project, a sensor is used to measure the intensity of sound in an environment. The sensor can represent this information in two ways: as a continuous value that changes gradually (similar to the volume you hear when adjusting a knob) or as a value that is in specific states, such as "on" or "off" (similar to the lights of a power indicator). Which of the following options correctly describes these signals? 

• The continuous signal is digital and the signal in specific states is analog.

• The continuous signal is analog and the signal in specific states is digital.

• Both signals are digital.

• Both signals are analog.

Imagine you have a light switch and a dimmer. The switch only has two positions: on or off. The dimmer, on the other hand, allows you to control the intensity of the light gradually. In Arduino, digital pins function like the switch and analog pins like the dimmer. Which of the following statements best describes the function of digital and analog pins on an Arduino board? 

• Digitals can only be on or off, while analog can have many levels of intensity.

• Analogs are faster than digitals.

• Digitals are used only for sensors, and analog for actuators.

• There is no difference, they both serve the same purpose.

You are using an ultrasonic sensor (HC-SR04) to measure the distance to an object. The sensor sends out a sound wave and measures the time it takes for the echo to return. Which of the following is NOT a factor that can affect the accuracy of the distance measurement? 

• Temperature variations.

• The color of the object.

• The distance to the object.

• The angle of the sensor.