18 Errors & Nullability questions from the GraphQL bank, written for Indian campus drives and tech interviews. Every question has a verified answer and an AI-tutor explanation on placd.
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A.the rule that when a non-null field resolves to nothing or errors, the failure bubbles up to the nearest nullable ancestor
B.the top-level response key listing problems encountered, returned alongside any partial data that did succeed
C.the schema modifier, written with a trailing exclamation mark, guaranteeing a field or argument can never be the absence-of-value
D.the open-ended response map carrying non-standard metadata, such as error codes or tracing, outside data and errors
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2. Which term means: "the schema modifier, written with a trailing exclamation mark, guaranteeing a field or argument can never be the absence-of-value"?
Junior
A.Errors-as-data
B.Null propagation
C.Partial response
D.Non-null
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3. Which statement is correct?
Junior
A.Non-null — the open-ended response map carrying non-standard metadata, such as error codes or tracing, outside data and errors
B.Non-null — a result that returns both a populated data object and an errors list because some fields succeeded while others failed
C.Non-null — the top-level response key listing problems encountered, returned alongside any partial data that did succeed
D.Non-null — the schema modifier, written with a trailing exclamation mark, guaranteeing a field or argument can never be the absence-of-value
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4. What is Null propagation?
Mid
A.the rule that when a non-null field resolves to nothing or errors, the failure bubbles up to the nearest nullable ancestor
B.the top-level response key listing problems encountered, returned alongside any partial data that did succeed
C.the open-ended response map carrying non-standard metadata, such as error codes or tracing, outside data and errors
D.a result that returns both a populated data object and an errors list because some fields succeeded while others failed
Answer + AI explanation with Pro
5. Which term means: "the rule that when a non-null field resolves to nothing or errors, the failure bubbles up to the nearest nullable ancestor"?
Mid
A.Null propagation
B.Partial response
C.Errors array
D.Errors-as-data
Answer + AI explanation with Pro
6. Which statement is correct?
Mid
A.Null propagation — the top-level response key listing problems encountered, returned alongside any partial data that did succeed
B.Null propagation — a result that returns both a populated data object and an errors list because some fields succeeded while others failed
C.Null propagation — the rule that when a non-null field resolves to nothing or errors, the failure bubbles up to the nearest nullable ancestor
D.Null propagation — a design pattern modeling expected failures as schema union members instead of relying on the protocol-level errors list
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7. What is Errors array?
Junior
A.the top-level response key listing problems encountered, returned alongside any partial data that did succeed
B.a design pattern modeling expected failures as schema union members instead of relying on the protocol-level errors list
C.the rule that when a non-null field resolves to nothing or errors, the failure bubbles up to the nearest nullable ancestor
D.a result that returns both a populated data object and an errors list because some fields succeeded while others failed
Answer + AI explanation with Pro
8. Which term means: "the top-level response key listing problems encountered, returned alongside any partial data that did succeed"?
Junior
A.Errors array
B.Partial response
C.Errors-as-data
D.Extensions
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9. Which statement is correct?
Junior
A.Errors array — a design pattern modeling expected failures as schema union members instead of relying on the protocol-level errors list
B.Errors array — the schema modifier, written with a trailing exclamation mark, guaranteeing a field or argument can never be the absence-of-value
C.Errors array — the top-level response key listing problems encountered, returned alongside any partial data that did succeed
D.Errors array — the rule that when a non-null field resolves to nothing or errors, the failure bubbles up to the nearest nullable ancestor
Answer + AI explanation with Pro
10. What is Partial response?
Mid
A.the top-level response key listing problems encountered, returned alongside any partial data that did succeed
B.a result that returns both a populated data object and an errors list because some fields succeeded while others failed
C.a design pattern modeling expected failures as schema union members instead of relying on the protocol-level errors list
D.the open-ended response map carrying non-standard metadata, such as error codes or tracing, outside data and errors
Answer + AI explanation with Pro
11. Which term means: "a result that returns both a populated data object and an errors list because some fields succeeded while others failed"?
Mid
A.Partial response
B.Errors-as-data
C.Null propagation
D.Extensions
Answer + AI explanation with Pro
12. Which statement is correct?
Mid
A.Partial response — the rule that when a non-null field resolves to nothing or errors, the failure bubbles up to the nearest nullable ancestor
B.Partial response — a design pattern modeling expected failures as schema union members instead of relying on the protocol-level errors list
C.Partial response — the open-ended response map carrying non-standard metadata, such as error codes or tracing, outside data and errors
D.Partial response — a result that returns both a populated data object and an errors list because some fields succeeded while others failed
Answer + AI explanation with Pro
13. What is Errors-as-data?
Senior
A.the open-ended response map carrying non-standard metadata, such as error codes or tracing, outside data and errors
B.a design pattern modeling expected failures as schema union members instead of relying on the protocol-level errors list
C.the rule that when a non-null field resolves to nothing or errors, the failure bubbles up to the nearest nullable ancestor
D.the top-level response key listing problems encountered, returned alongside any partial data that did succeed
Answer + AI explanation with Pro
14. Which term means: "a design pattern modeling expected failures as schema union members instead of relying on the protocol-level errors list"?
Senior
A.Non-null
B.Errors array
C.Errors-as-data
D.Partial response
Answer + AI explanation with Pro
15. Which statement is correct?
Senior
A.Errors-as-data — the open-ended response map carrying non-standard metadata, such as error codes or tracing, outside data and errors
B.Errors-as-data — a result that returns both a populated data object and an errors list because some fields succeeded while others failed
C.Errors-as-data — the schema modifier, written with a trailing exclamation mark, guaranteeing a field or argument can never be the absence-of-value
D.Errors-as-data — a design pattern modeling expected failures as schema union members instead of relying on the protocol-level errors list
Answer + AI explanation with Pro
16. What is Extensions?
Mid
A.the open-ended response map carrying non-standard metadata, such as error codes or tracing, outside data and errors
B.the schema modifier, written with a trailing exclamation mark, guaranteeing a field or argument can never be the absence-of-value
C.a result that returns both a populated data object and an errors list because some fields succeeded while others failed
D.a design pattern modeling expected failures as schema union members instead of relying on the protocol-level errors list
Answer + AI explanation with Pro
17. Which term means: "the open-ended response map carrying non-standard metadata, such as error codes or tracing, outside data and errors"?
Mid
A.Errors array
B.Extensions
C.Null propagation
D.Errors-as-data
Answer + AI explanation with Pro
18. Which statement is correct?
Mid
A.Extensions — a result that returns both a populated data object and an errors list because some fields succeeded while others failed
B.Extensions — the open-ended response map carrying non-standard metadata, such as error codes or tracing, outside data and errors
C.Extensions — the top-level response key listing problems encountered, returned alongside any partial data that did succeed
D.Extensions — the schema modifier, written with a trailing exclamation mark, guaranteeing a field or argument can never be the absence-of-value
Answer + AI explanation with Pro
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