Delivery drone concept in Drone Programming - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

Calculate remaining battery after delivery

A delivery drone starts with 100% battery. It uses 15% battery to fly to the destination and 10% to return. What is the remaining battery percentage after the round trip?

Drone Programming

battery = 100
used_to_destination = 15
used_to_return = 10
remaining_battery = battery - used_to_destination - used_to_return
print(remaining_battery)

A 65

B 75

C 85

D 90

💡 Hint

Subtract the battery used for both legs from the total battery.

The drone uses 15% + 10% = 25% battery. Starting from 100%, remaining is 100 - 25 = 75%.

🧠 Conceptual

intermediate

Identify the drone's delivery status

The drone has a variable 'package_delivered' that is True if the package is delivered, False otherwise. Which code snippet correctly prints 'Delivered' when the package is delivered and 'In transit' otherwise?

A

if package_delivered:
    print('Delivered')
else:
    print('In transit')

B

if package_delivered == False:
    print('Delivered')
else:
    print('In transit')

C

if package_delivered = True:
    print('Delivered')
else:
    print('In transit')

D

)'tisnart nI'(tnirp    
:esle
)'derevileD'(tnirp    
:dereviled_egakcap fi

💡 Hint

Check the condition and indentation carefully.

Option A uses correct syntax and indentation. Option A reverses the logic. Option A uses assignment (=) instead of comparison (==). Option A has wrong indentation causing syntax error.

🔧 Debug

advanced

Fix the drone's flight path calculation error

The drone's flight path distance is calculated by adding the distances to destination and back. The code below has a bug. What error does it raise?

Drone Programming

distance_to_destination = 12.5
distance_to_return = '12.5'
total_distance = distance_to_destination + distance_to_return
print(total_distance)

A SyntaxError: invalid syntax

B NameError: name 'distance_to_return' is not defined

C TypeError: unsupported operand type(s) for +: 'float' and 'str'

D ValueError: could not convert string to float

💡 Hint

Check the types of variables being added.

Adding a float and a string causes a TypeError because Python cannot add different types directly.

📝 Syntax

advanced

Identify the syntax error in drone command function

Which option contains a syntax error in defining a function to start the drone?

A

def start_drone():
    print('Drone started')  # correct

B

def start_drone():
    print('Drone started')

C

)'detrats enorD'(tnirp    
:)(enord_trats fed

D

def start_drone:
    print('Drone started')

💡 Hint

Check the function definition syntax.

Option D misses parentheses after function name, causing a syntax error.

🚀 Application

expert

Calculate total delivery time with variable speeds

A drone flies to a destination 20 km away at 40 km/h and returns at 30 km/h due to wind. What is the total flight time in hours?

A 1.1666666666666667

B 0.95

C 0.75

D 1.0

💡 Hint

Use time = distance / speed for each leg and add them.

Time to destination = 20/40 = 0.5 hours; time to return = 20/30 ≈ 0.6667 hours; total ≈ 1.1667 hours.

Practice

1. What is the main purpose of a delivery drone in programming terms?

easy

A. To carry packages from one place to another automatically

B. To play music while flying

C. To take photos of landscapes

D. To clean the air by flying

Solution

1. Step 1: Understand the drone's role

   A delivery drone is designed to transport packages safely and efficiently.

2. Step 2: Match the purpose to options

   Only To carry packages from one place to another automatically describes carrying packages automatically, which fits delivery.

3. Final Answer:

   To carry packages from one place to another automatically -> Option A

4. Quick Check:

   Delivery drone = carry packages [OK]

Hint: Delivery drones move packages, not play or clean [OK]

Common Mistakes:

• Confusing drone delivery with photography
• Thinking drones clean air
• Assuming drones play music

2. Which of the following is the correct way to set a package in a drone program?

easy

A. drone.package = 'Box'

B. drone->setPackage('Box')

C. setPackage(drone, 'Box')

D. drone.setPackage('Box')

Solution

1. Step 1: Identify method call syntax

   In drone programming, methods are called on objects using dot notation like drone.setPackage('Box').

2. Step 2: Check each option

   drone.setPackage('Box') uses correct method call syntax. drone.package = 'Box' assigns directly, which may not be allowed. setPackage(drone, 'Box') uses wrong function call style. drone->setPackage('Box') uses incorrect arrow syntax.

3. Final Answer:

   drone.setPackage('Box') -> Option D

4. Quick Check:

   Method call uses dot notation [OK]

Hint: Use dot notation for methods like setPackage() [OK]

Common Mistakes:

• Using assignment instead of method call
• Using arrow (->) instead of dot (.)
• Calling method with wrong argument order

3. What will be the output of this drone program snippet?

drone.setPackage('Book')
drone.setDestination('Home')
print(drone.status())

Assuming status() returns a string showing package and destination.

medium

A. "Package: Book, Destination: None"

B. "Package: Book, Destination: Home"

C. "Package: None, Destination: Home"

D. "No package or destination set"

Solution

1. Step 1: Analyze method calls

   The program sets the package to 'Book' and destination to 'Home'.

2. Step 2: Understand status() output

   Status shows current package and destination, so it should reflect 'Book' and 'Home'.

3. Final Answer:

   "Package: Book, Destination: Home" -> Option B

4. Quick Check:

   Status shows set package and destination [OK]

Hint: status() shows current package and destination [OK]

Common Mistakes:

• Assuming package or destination is None
• Confusing output format
• Ignoring previous set commands

4. Identify the error in this drone delivery code snippet:

drone.setPackage('Laptop')
drone.flyTo('Office')
drone.deliver()

Assuming flyTo moves drone but delivery requires destination set first.

medium

A. flyTo() should be flyToDestination()

B. Package not set before delivery

C. Missing destination set before flying

D. deliver() method does not exist

Solution

1. Step 1: Check method order and requirements

   Delivery requires setting destination before flying. Here, destination is not set explicitly.

2. Step 2: Identify missing step

   Code calls flyTo('Office') but does not set destination property, which delivery depends on.

3. Final Answer:

   Missing destination set before flying -> Option C

4. Quick Check:

   Destination must be set before flyTo and deliver [OK]

Hint: Always set destination before flying and delivering [OK]

Common Mistakes:

• Skipping destination setup
• Assuming flyTo sets destination automatically
• Confusing method names

5. You want to program a drone to deliver multiple packages to different destinations in sequence. Which approach best fits this task?

hard

A. Use a loop to set each package and destination, then fly and deliver each time

B. Set all packages at once and fly to one destination only

C. Fly randomly and drop packages without setting destinations

D. Deliver packages without flying

Solution

1. Step 1: Understand multi-package delivery needs

   Each package must be assigned a destination and delivered one by one.

2. Step 2: Choose correct programming structure

   A loop allows repeating setPackage, setDestination, fly, and deliver steps for each package.

3. Step 3: Evaluate other options

   Set all packages at once and fly to one destination only ignores multiple destinations. Fly randomly and drop packages without setting destinations is unsafe and random. Deliver packages without flying skips flying, which is needed.

4. Final Answer:

   Use a loop to set each package and destination, then fly and deliver each time -> Option A

5. Quick Check:

   Loop for sequential deliveries [OK]

Hint: Loop through packages and destinations for multiple deliveries [OK]

Common Mistakes:

• Trying to deliver all packages at once
• Ignoring destination assignment
• Skipping flying step