Rendering interview questions

12 real Rendering questions from the Blazor 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 StateHasChanged?

Junior
  1. A.generating a component's initial HTML on the server so the page shows content before interactivity is wired up
  2. B.the method that flags a component as needing to re-render, used when state changes outside a normal event
  3. C.the low-level object used in C# to emit component output imperatively instead of using markup
  4. D.the process of comparing a new output against the previous one and applying only the minimal DOM changes
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3. Which statement is correct?

Junior
  1. A.StateHasChanged — the method that flags a component as needing to re-render, used when state changes outside a normal event
  2. B.StateHasChanged — generating a component's initial HTML on the server so the page shows content before interactivity is wired up
  3. C.StateHasChanged — the process of comparing a new output against the previous one and applying only the minimal DOM changes
  4. D.StateHasChanged — the low-level object used in C# to emit component output imperatively instead of using markup
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4. What is Render tree diffing?

Mid
  1. A.the low-level object used in C# to emit component output imperatively instead of using markup
  2. B.the method that flags a component as needing to re-render, used when state changes outside a normal event
  3. C.the process of comparing a new output against the previous one and applying only the minimal DOM changes
  4. D.generating a component's initial HTML on the server so the page shows content before interactivity is wired up
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6. Which statement is correct?

Mid
  1. A.Render tree diffing — the process of comparing a new output against the previous one and applying only the minimal DOM changes
  2. B.Render tree diffing — generating a component's initial HTML on the server so the page shows content before interactivity is wired up
  3. C.Render tree diffing — the method that flags a component as needing to re-render, used when state changes outside a normal event
  4. D.Render tree diffing — the low-level object used in C# to emit component output imperatively instead of using markup
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7. What is Prerendering?

Mid
  1. A.generating a component's initial HTML on the server so the page shows content before interactivity is wired up
  2. B.the process of comparing a new output against the previous one and applying only the minimal DOM changes
  3. C.the low-level object used in C# to emit component output imperatively instead of using markup
  4. D.the method that flags a component as needing to re-render, used when state changes outside a normal event
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8. Which term means: "generating a component's initial HTML on the server so the page shows content before interactivity is wired up"?

Mid
  1. A.Render tree diffing
  2. B.Prerendering
  3. C.StateHasChanged
  4. D.RenderTreeBuilder
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9. Which statement is correct?

Mid
  1. A.Prerendering — the process of comparing a new output against the previous one and applying only the minimal DOM changes
  2. B.Prerendering — generating a component's initial HTML on the server so the page shows content before interactivity is wired up
  3. C.Prerendering — the method that flags a component as needing to re-render, used when state changes outside a normal event
  4. D.Prerendering — the low-level object used in C# to emit component output imperatively instead of using markup
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10. What is RenderTreeBuilder?

Senior
  1. A.the method that flags a component as needing to re-render, used when state changes outside a normal event
  2. B.the process of comparing a new output against the previous one and applying only the minimal DOM changes
  3. C.the low-level object used in C# to emit component output imperatively instead of using markup
  4. D.generating a component's initial HTML on the server so the page shows content before interactivity is wired up
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12. Which statement is correct?

Senior
  1. A.RenderTreeBuilder — the low-level object used in C# to emit component output imperatively instead of using markup
  2. B.RenderTreeBuilder — the method that flags a component as needing to re-render, used when state changes outside a normal event
  3. C.RenderTreeBuilder — generating a component's initial HTML on the server so the page shows content before interactivity is wired up
  4. D.RenderTreeBuilder — the process of comparing a new output against the previous one and applying only the minimal DOM changes
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