Landing and disarming in Drone Programming - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to land the drone safely.

Drone Programming

drone.[1]()

Drag options to blanks, or click blank then click option'

Aland

Btakeoff

Carm

Ddisarm

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'takeoff' instead of 'land' will make the drone rise, not land.

The land() command makes the drone descend and land safely.

2fill in blank

medium

Complete the code to disarm the drone after landing.

Drone Programming

drone.[1]()

Drag options to blanks, or click blank then click option'

Adisarm

Btakeoff

Carm

Dland

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'land' again instead of 'disarm' will not turn off the motors.

The disarm() command turns off the drone's motors after landing for safety.

3fill in blank

hard

Fix the error in the code to land and then disarm the drone.

Drone Programming

drone.land()
drone.[1]()

Drag options to blanks, or click blank then click option'

Aland

Bdisarm

Ctakeoff

Darm

Attempts:

3 left

💡 Hint

Common Mistakes

Calling 'arm' after landing will start the motors again.

After landing, the drone must be disarmed to stop the motors safely.

4fill in blank

hard

Fill both blanks to land the drone and then disarm it safely.

Drone Programming

drone.[1]()
drone.[2]()

Drag options to blanks, or click blank then click option'

Aland

Btakeoff

Cdisarm

Darm

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the commands will cause errors or unsafe behavior.

First, the drone lands using land(). Then, it is disarmed with disarm() to stop the motors.

5fill in blank

hard

Fill all three blanks to arm the drone, take off, then land safely.

Drone Programming

drone.[1]()
drone.[2]()
drone.[3]()

Drag options to blanks, or click blank then click option'

Aarm

Btakeoff

Cland

Ddisarm

Attempts:

3 left

💡 Hint

Common Mistakes

Skipping arming will prevent takeoff.

Landing before takeoff is illogical.

First, the drone is armed with arm(). Then it takes off using takeoff(). Finally, it lands with land(). Disarming should happen after landing but is not included here.

Practice

1. What is the main purpose of disarm() in drone programming?

easy

A. To increase the drone's speed

B. To make the drone take off automatically

C. To stop the drone's motors and prevent propeller movement

D. To change the drone's flight path

Solution

1. Step 1: Understand the function of disarm()

   The disarm() function is used to stop the drone's motors, which stops the propellers from spinning.

2. Step 2: Compare with other options

   Taking off, increasing speed, or changing flight path are not related to disarming.

3. Final Answer:

   To stop the drone's motors and prevent propeller movement -> Option C

4. Quick Check:

   Disarm = stop motors [OK]

Hint: Disarm always means stop motors and propellers [OK]

Common Mistakes:

• Confusing disarm with takeoff
• Thinking disarm changes flight path
• Assuming disarm increases speed

2. Which of the following is the correct syntax to land a drone using a function named land()?

easy

A. land()

B. land[]

C. land{}

D. land;

Solution

1. Step 1: Recall function call syntax

   In most programming languages, calling a function uses parentheses after the function name, like land().

2. Step 2: Check other options

   Square brackets, curly braces, or semicolons alone are not valid for calling functions.

3. Final Answer:

   land() -> Option A

4. Quick Check:

   Function call = name() [OK]

Hint: Functions need parentheses to run [OK]

Common Mistakes:

• Using brackets [] instead of parentheses ()
• Adding semicolon without parentheses
• Using curly braces {} for function calls

3. What will be the output of this code snippet?

drone.arm()
drone.takeoff()
drone.land()
drone.disarm()
print(drone.status)

Assuming status shows 'disarmed' after disarming.

medium

A. armed

B. flying

C. landed

D. disarmed

Solution

1. Step 1: Follow the code steps

   The drone is first armed, then takes off, then lands, and finally disarms.

2. Step 2: Understand status after disarm()

   After calling disarm(), the drone's status changes to 'disarmed'.

3. Final Answer:

   disarmed -> Option D

4. Quick Check:

   Status after disarm() = disarmed [OK]

Hint: Disarm sets status to 'disarmed' after landing [OK]

Common Mistakes:

• Assuming status stays 'flying' after land()
• Confusing 'landed' with 'disarmed'
• Ignoring the effect of disarm() on status

4. Identify the error in this drone landing and disarming code:

drone.land
safety = drone.disarm()

medium

A. Missing parentheses after land function call

B. Using assignment instead of comparison

C. Incorrect variable name 'safety'

D. Disarm should be called before land

Solution

1. Step 1: Check function call syntax

   The code uses drone.land without parentheses, so the function is not called.

2. Step 2: Verify order and variables

   Assigning drone.disarm() to safety is valid, and disarm after land is correct.

3. Final Answer:

   Missing parentheses after land function call -> Option A

4. Quick Check:

   Function calls need () [OK]

Hint: Always add () to call functions [OK]

Common Mistakes:

• Forgetting parentheses on function calls
• Thinking disarm must come before land
• Confusing assignment with comparison

5. You want to safely end a drone flight by landing and then disarming. Which code sequence correctly ensures the drone lands before disarming?

hard

A. drone.disarm()
drone.land()

B. drone.land()
drone.disarm()

C. drone.land()
drone.land()
drone.disarm()

D. drone.disarm()
drone.disarm()
drone.land()

Solution

1. Step 1: Understand safe landing sequence

   The drone must land first to touch the ground safely before motors stop.

2. Step 2: Check code order

   drone.land() drone.disarm() calls land() first, then disarm(), which is correct.

3. Final Answer:

   drone.land() followed by drone.disarm() -> Option B

4. Quick Check:

   Land before disarm = drone.land() drone.disarm() [OK]

Hint: Always land before disarming motors [OK]

Common Mistakes:

• Disarming before landing causing unsafe stop
• Repeating land unnecessarily
• Calling disarm multiple times before landing