ATD Quiz

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1 / 7

What happens when this code runs?


import asyncio


async def work(name):
    print(f"{name} start")
    await asyncio.sleep(1)
    print(f"{name} end")


async def main():
    await work("A")
    await work("B")


asyncio.run(main())

It runs sequentially; total runtime ≈ 2 seconds

It runs both tasks concurrently; total runtime ≈ 1 second

It raises a RuntimeError because asyncio.run() cannot be used with multiple awaits

The output order is unpredictable

2 / 7

A baker wants to model the number of raisins found in each muffin they bake. He knows that on average, there are 5 raisins per muffin, and raisins are distributed randomly and independently. Which probability distribution is most appropriate to model the number of raisins in a single muffin?

Binomial

Exponential

Gaussian

Poisson

3 / 7

What does the term “AI winter” refer to?

Period in scientific research in 20th century

The apocalyptic scenario of the future where Artificial Superintelligence takes over humanity

The vanishing gradient problem in Deep Neural Network

4 / 7

When it is reasonable to use the Leave-One-Out Cross-Validation (LOOCV)?

More than 100 features

Less than 10 features

More than 10000 samples dataset

Less than 100 samples dataset

5 / 7

What does the term “Medallion Architecture” mean?

Data design pattern used in lakehouses to organize data into layers of refinement (Bronze, Silver, Gold).

It’s a storage optimization technique that uses three folders: Bronze, Silver, Gold to separate hot, warm and cold data.

It's a configuration pattern that assigns Bronze, Silver or Gold compute tiers based on performance.

Aligning data to business needs.

6 / 7

What is the best approach to read last committed data without locking in RDBMS?

Use “READ UNCOMMITED” isolation level

None of above

Use optimistic isolation type, in example “SNAPSHOT” isolation level

Use “WITH (NO LOCK)” hint

7 / 7

Pick one answer that describes slowly changing dimensions Type 2. (SCD2)

Keep limited historical context (current+previous value) in the same row.

Nothing above.

Only the Current data is kept. No history.

Full history of changes is made by closing the old record and inserting a new one.

Your score is

The average score is 48%

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