Daily Coding Quiz: Monday, 9 November 2026

All 10 coding questions with answers and explanations. 0 players took part.

1. What is printed?

   Python · easy

   print("hack" * 2 + "!")

   1. hack2!
   2. hackhack!
   3. hack!hack!
   4. TypeError

   Answer: B. hackhack!

   Explanation: Multiplying a string by an integer repeats it; + then concatenates "!".

2. Which layer turns a vector of scores into probabilities that add up to 1?

   AI & GenAI · easy

   1. ReLU
   2. Softmax
   3. Dropout
   4. Batch normalisation

   Answer: B. Softmax

   Explanation: softmax(zᵢ) = e^zᵢ / Σ e^zⱼ: every output is positive and they sum to 1, so it is used for multi-class outputs and next-token prediction.

3. What is printed?

   Python · easy

   print([x * x for x in range(5) if x % 2 == 0])

   1. [0, 4, 16]
   2. [1, 9]
   3. [0, 1, 4, 9, 16]
   4. [4, 16]

   Answer: A. [0, 4, 16]

   Explanation: range(5) is 0–4; the even ones are 0, 2, 4, and their squares are 0, 4, 16.

4. What is the shape of a 640 × 480 colour image loaded with OpenCV (cv2.imread)?

   Computer Vision · easy

   1. (640, 480, 3)
   2. (480, 640, 3)
   3. (3, 480, 640)
   4. (480, 640)

   Answer: B. (480, 640, 3)

   Explanation: NumPy arrays are (rows, columns, channels) = (height, width, 3). Also note OpenCV stores the channels as BGR, not RGB.

5. What is printed?

   Python · medium

   print(sorted(["banana", "Apple", "cherry"]))

   1. ['Apple', 'banana', 'cherry']
   2. ['apple', 'banana', 'cherry']
   3. ['banana', 'cherry', 'Apple']
   4. ['cherry', 'banana', 'Apple']

   Answer: A. ['Apple', 'banana', 'cherry']

   Explanation: Strings sort by code point, and capital letters come before lowercase ones, so "Apple" is first here. Use key=str.lower to sort case-insensitively.

6. What is printed?

   Python · medium

   x = 10
   def f():
       x = 20
       def g():
           nonlocal x
           x += 1
       g()
       return x
   print(f(), x)

   1. 21 10
   2. 21 21
   3. 11 10
   4. 20 10

   Answer: A. 21 10

   Explanation: nonlocal makes g change f’s x (20 → 21). The global x stays 10.

7. What is printed?

   Python · medium

   def add(item, box=[]):
       box.append(item)
       return box
   
   add(1)
   print(add(2))

   1. [2]
   2. [1, 2]
   3. []
   4. An error

   Answer: B. [1, 2]

   Explanation: Default values are evaluated once, when the function is defined. Both calls share the same list. Use box=None and create the list inside.

8. Your training and validation losses are both high and close together. What is the most useful next step?

   Machine Learning · hard

   1. Add dropout and more regularisation
   2. Collect more of the same data
   3. Increase model capacity or add better features: the model is underfitting
   4. Use early stopping sooner

   Answer: C. Increase model capacity or add better features: the model is underfitting

   Explanation: High bias: the model can’t even fit the training data. Regularisation and early stopping fight variance, and more data mostly helps when the model overfits.

9. What is printed?

   Python · hard

   class Counter:
       count = 0
       def __init__(self):
           self.count += 1
   
   a, b = Counter(), Counter()
   print(Counter.count, a.count, b.count)

   1. 0 1 1
   2. 2 2 2
   3. 2 1 2
   4. 0 0 0

   Answer: A. 0 1 1

   Explanation: self.count += 1 reads the class attribute (0) but writes a new instance attribute. The class attribute is never changed. Write Counter.count += 1 to share it.

10. What is printed?

    Python · hard

    def gen():
        x = yield 1
        yield x * 10
    
    g = gen()
    print(next(g), g.send(5))

    1. 1 50
    2. 1 10
    3. 1 None
    4. TypeError

    Answer: A. 1 50

    Explanation: next(g) runs to the first yield and gives 1. send(5) resumes the generator, making the paused yield expression evaluate to 5, so the next yield gives 50.

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