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Cloud Functions interview questions

15 real Cloud Functions questions from the Firebase bank, as asked in Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd — free to start.

1. What is Background trigger?

Junior
  1. A.server code that runs automatically in response to an event like a document write or a new user signing up
  2. B.the added latency when a new instance must boot from scratch because no warm one is available to serve a request
  3. C.a typed endpoint invoked from the client SDK that automatically forwards the user's auth context and handles serialization
  4. D.a deployed handler invoked directly over a URL, used to build callable APIs and webhooks
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3. Which statement is correct?

Junior
  1. A.Background trigger — a typed endpoint invoked from the client SDK that automatically forwards the user's auth context and handles serialization
  2. B.Background trigger — the added latency when a new instance must boot from scratch because no warm one is available to serve a request
  3. C.Background trigger — server code that runs automatically in response to an event like a document write or a new user signing up
  4. D.Background trigger — the design rule that event handlers tolerate being delivered more than once, because the platform guarantees at-least-once execution
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4. What is HTTP function?

Junior
  1. A.a deployed handler invoked directly over a URL, used to build callable APIs and webhooks
  2. B.the added latency when a new instance must boot from scratch because no warm one is available to serve a request
  3. C.the design rule that event handlers tolerate being delivered more than once, because the platform guarantees at-least-once execution
  4. D.server code that runs automatically in response to an event like a document write or a new user signing up
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6. Which statement is correct?

Junior
  1. A.HTTP function — the design rule that event handlers tolerate being delivered more than once, because the platform guarantees at-least-once execution
  2. B.HTTP function — a deployed handler invoked directly over a URL, used to build callable APIs and webhooks
  3. C.HTTP function — the added latency when a new instance must boot from scratch because no warm one is available to serve a request
  4. D.HTTP function — a typed endpoint invoked from the client SDK that automatically forwards the user's auth context and handles serialization
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7. What is Cold start?

Mid
  1. A.a deployed handler invoked directly over a URL, used to build callable APIs and webhooks
  2. B.the added latency when a new instance must boot from scratch because no warm one is available to serve a request
  3. C.a typed endpoint invoked from the client SDK that automatically forwards the user's auth context and handles serialization
  4. D.the design rule that event handlers tolerate being delivered more than once, because the platform guarantees at-least-once execution
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8. Which term means: "the added latency when a new instance must boot from scratch because no warm one is available to serve a request"?

Mid
  1. A.Callable function
  2. B.Cold start
  3. C.Background trigger
  4. D.Idempotency requirement
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9. Which statement is correct?

Mid
  1. A.Cold start — the added latency when a new instance must boot from scratch because no warm one is available to serve a request
  2. B.Cold start — the design rule that event handlers tolerate being delivered more than once, because the platform guarantees at-least-once execution
  3. C.Cold start — server code that runs automatically in response to an event like a document write or a new user signing up
  4. D.Cold start — a deployed handler invoked directly over a URL, used to build callable APIs and webhooks
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10. What is Callable function?

Mid
  1. A.server code that runs automatically in response to an event like a document write or a new user signing up
  2. B.the design rule that event handlers tolerate being delivered more than once, because the platform guarantees at-least-once execution
  3. C.the added latency when a new instance must boot from scratch because no warm one is available to serve a request
  4. D.a typed endpoint invoked from the client SDK that automatically forwards the user's auth context and handles serialization
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11. Which term means: "a typed endpoint invoked from the client SDK that automatically forwards the user's auth context and handles serialization"?

Mid
  1. A.Idempotency requirement
  2. B.HTTP function
  3. C.Cold start
  4. D.Callable function
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12. Which statement is correct?

Mid
  1. A.Callable function — server code that runs automatically in response to an event like a document write or a new user signing up
  2. B.Callable function — a deployed handler invoked directly over a URL, used to build callable APIs and webhooks
  3. C.Callable function — the added latency when a new instance must boot from scratch because no warm one is available to serve a request
  4. D.Callable function — a typed endpoint invoked from the client SDK that automatically forwards the user's auth context and handles serialization
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13. What is Idempotency requirement?

Senior
  1. A.a deployed handler invoked directly over a URL, used to build callable APIs and webhooks
  2. B.the added latency when a new instance must boot from scratch because no warm one is available to serve a request
  3. C.the design rule that event handlers tolerate being delivered more than once, because the platform guarantees at-least-once execution
  4. D.server code that runs automatically in response to an event like a document write or a new user signing up
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14. Which term means: "the design rule that event handlers tolerate being delivered more than once, because the platform guarantees at-least-once execution"?

Senior
  1. A.Idempotency requirement
  2. B.Background trigger
  3. C.Callable function
  4. D.Cold start
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15. Which statement is correct?

Senior
  1. A.Idempotency requirement — the added latency when a new instance must boot from scratch because no warm one is available to serve a request
  2. B.Idempotency requirement — a typed endpoint invoked from the client SDK that automatically forwards the user's auth context and handles serialization
  3. C.Idempotency requirement — a deployed handler invoked directly over a URL, used to build callable APIs and webhooks
  4. D.Idempotency requirement — the design rule that event handlers tolerate being delivered more than once, because the platform guarantees at-least-once execution
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