Input & Output Devices

9.Which of the following is an output device?

10.A library uses a device to quickly capture product information from barcodes on books. This device is an example of:

11.Which of the following best describes the function of an actuator?

12.A chemical plant needs to monitor the acidity of a solution. Which sensor should be used?

13.A factory uses a sensor to continuously measure the amount of liquid flowing through a pipe. The sensor sends data to a computer which triggers an alarm if the flow rate drops below a certain level. Which type of sensor is being used?

14.An engineer needs to create a digital 3D model of a machine part for analysis. Which input device would be most suitable?

15.A control system in a greenhouse uses a sensor to monitor the level of water vapour in the air. When the level falls below a set point, a misting system is activated. Which sensor is used?

16.A school library wants to digitise old documents and photographs for storage and sharing. Which input device is most appropriate?

17.A chemical plant needs to monitor the acidity of a solution continuously. Which sensor should be used?

18.A supermarket uses a device to quickly capture product information from barcodes at the checkout. This device is an example of:

19.A security system detects intruders by sensing body heat. Which sensor is most suitable?

20.A robotics company needs a sensor to monitor the position of objects and prevent collisions. Which sensor should be used?

21.A car's anti-lock braking system (ABS) uses a sensor to monitor wheel rotation and prevent locking. Which sensor is most likely used?

22.A farmer wants to monitor soil moisture levels to ensure optimal irrigation. Which sensor is most appropriate?

23.A student uses a data logger with a temperature sensor to record the temperature in a greenhouse every 10 seconds for 24 hours. The data logger stores the readings in a file. Which of the following best describes the role of the temperature sensor?

24.A chemical plant uses a sensor to monitor the acidity of a solution continuously. The sensor sends data to a computer which triggers an alarm if the pH goes outside a safe range. Which type of sensor is being used?

25.A factory uses a sensor to continuously measure the amount of liquid flowing through a pipe. The sensor sends data to a computer which triggers an alarm if the flow rate drops below a set point. Which sensor is most suitable?

26.A student wants to digitise old family photographs for storage and sharing. Which input device is most appropriate?

27.A greenhouse uses a sensor to monitor the level of water vapour in the air. When the level falls below a set point, a misting system is activated to increase humidity. Which sensor is most suitable?

28.A student uses a data logger with a temperature sensor to record the temperature in a greenhouse every 10 seconds for 24 hours. The data logger stores the readings in its memory. Which statement best describes this system?

29.A chemical plant uses a sensor to continuously measure the amount of liquid flowing through a pipe. The sensor sends data to a computer which triggers an alarm if the flow rate drops below a set threshold. Which sensor is being used?

30.A greenhouse uses a sensor to monitor the level of water vapour in the air. When the level falls below a set point, a misting system is activated to increase humidity. Which sensor is used and what type of system is this?

31.A factory uses a sensor to continuously measure the amount of liquid flowing through a pipe. The sensor sends data to a computer which triggers an alarm if the flow rate goes outside a set range. Which type of system is this?

32.A chemical plant uses a pH sensor to monitor the acidity of a solution. The sensor sends data to a computer. If the pH goes above 8.0, a valve opens to add acid. If it goes below 6.0, a valve opens to add alkali. Which statement correctly describes this system?

33.Which of the following is an example of an actuator?

34.A factory uses a sensor to continuously measure the amount of liquid flowing through a pipe. The sensor sends data to a computer which triggers an alarm if the flow rate drops below a certain level. Which sensor is being used?

35.A factory uses a flow sensor to continuously measure the amount of liquid flowing through a pipe. The sensor sends data to a computer which triggers an alarm if the flow rate drops below 10 litres per minute. The alarm sounds for 5 seconds each time it is triggered. If the flow rate drops to 8 litres per minute and stays there for 30 seconds, how many times will the alarm sound?

36.A greenhouse uses a humidity sensor to monitor water vapour levels. The sensor outputs a voltage from 0 to 5 V, where 0 V corresponds to 0% relative humidity and 5 V corresponds to 100% relative humidity. If the sensor reads 3.5 V, what is the relative humidity?

37.A student uses a data logger with a temperature sensor to record the temperature in a greenhouse every 10 seconds for 24 hours. The data logger stores the readings in a file. How many readings will be recorded in total?

38.Which of the following sensors would be most appropriate for a system that detects intruders by sensing body heat?

39.A chemical plant uses a pH sensor to monitor the acidity of a solution. The sensor sends data to a computer. If the pH goes above 8.0, a valve opens to add acid. If the pH goes below 6.0, a valve opens to add alkali. This is an example of a:

40.A data logger records temperature every minute for 2 hours. The results are stored as a list of integers in degrees Celsius. The file size is 1200 bytes. How many bytes are used to store each temperature reading?

41.A sensor is an output device.

42.Which of the following are input devices? (Select all that apply)

43.Match each sensor to what it measures.

44.Arrange the following steps in the correct order for a control system that maintains water temperature in a fish tank:

45.A greenhouse uses a sensor to monitor water vapour levels. When the level falls below a set point, a misting system is activated. Which sensor is used?

46.Match each touch screen type to its operating principle.

47.Arrange the following printer types from generally slowest to fastest print speed.

48.A factory uses a flow sensor to measure the rate of liquid flowing through a pipe. The sensor outputs a voltage from 0 to 5 V, where 0 V corresponds to 0 L/min and 5 V corresponds to 100 L/min. What is the flow rate when the sensor outputs 3.2 V?

49.A data logger records temperature from a sensor every 10 seconds for 2 hours. Each reading is stored as a 2-byte integer. What is the total file size in bytes?

50.Which of the following sensors would be appropriate for a system that monitors soil conditions to ensure optimal plant growth? (Select all that apply)

51.Complete the sentence.

52.Name the type of printer that uses heat from a laser to fuse toner onto paper.

53.A data logger records temperature every 10 seconds for 2 hours. How many readings are taken?

54.Complete the sentence: A sensor that measures levels of water vapour in the air is called a ___ sensor.

55.Complete the sentence:

56.Explain the difference between a monitoring system and a control system.

57.A data logger records temperature every 10 seconds for 2 hours. How many readings are taken?