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Modern Application Development II · Quiz 2 · 12 Apr 2026 · January 2026 term

Question 14: Consider a scenario involving localStorage, Promise chai…

Question 14

+3 marksOne or more correct options

Consider a scenario involving localStorage, Promise chains, and Vue lifecycle hooks:
Scenario: A user authentication system where: On app initialization, the app checks localStorage for a stored user token• If a token exists, it validates the token asynchronously (via a Promise)• Based on validation, different UI components are rendered• The user navigates between different views• Code in mounted() hook:

Which of the following statements is/are CORRECT about this implementation?

Select all that apply.

  1. A

    If the page is refreshed while the Promise is pending, the token will be lost because localStorage is cleared on refresh

  2. B

    If token validation fails, the token is removed from storage, preventing automatic login on future page loads

  3. C

    The isAuthenticated flag might be false even though a storedToken exists, until the Promise validation completes

  4. D

    sessionStorage should be used instead of localStorage because user tokens should not persist across browser sessions

  5. E

    If the user navigates to a different route while validation is pending, the Promise will still complete and update the user data

Show answer

Correct answers

  • B

    If token validation fails, the token is removed from storage, preventing automatic login on future page loads

  • C

    The isAuthenticated flag might be false even though a storedToken exists, until the Promise validation completes

  • E

    If the user navigates to a different route while validation is pending, the Promise will still complete and update the user data

See the whole paperTake it as a mock test

Question 14 of 15 in the IIT Madras BS Modern Application Development II (MAD 2) Quiz 2 paper sat on 12 Apr 2026, in the January 2026 term (Modern Application Development Ii 06 Apr 26). It carries 3 marks.

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