4. Algorithms and flowcharts
A section of Information Technology, 9626
Listing 10 of 24 questions
Mark has a small glasshouse. He lives in a warm country where plants can die if they are left without water for too long. The glasshouse has a microprocessor controlled sprinkler system and a moisture sensor in the soil. Complete this flowchart to show the processing required to control the level of moisture in the soil of the glasshouse. You may assume that a pre-set value, dry, has already been input so that the system can test if the amount of moisture in the soil has reached or fallen below a certain level. The user activates the microprocessor system by pressing a switch. Complete the flowchart which inputs the moisture reading in the glasshouse and switches the sprinkler on and off according to this value. It also checks if the sprinkler is already on or off before attempting to switch it on or off. Start Is the system activated? is mlevel > dry? is sprinkler on? Stop Flowcharts often contain subroutines. Draw the symbol used to represent a subroutine in a flowchart. State what you would expect to see in the first box of a subroutine.
9626_m23_qp_12
THEORY
2023
Paper 1, Variant 2
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Questions Discovered
24