Bootstrap MCQs – Performance Optimization and Best Practices

21.) Which method prevents unnecessary reflows in Bootstrap layouts?

A) Using JavaScript to adjust element sizes
B) Using Flexbox instead of inline-block elements
C) Removing all margin and padding
D) Avoiding Bootstrap classes

Answer: Option B

Explanation: Flexbox provides efficient layout rendering, preventing recalculations (reflows) that can slow down performance.

22.) How does Bootstrap handle performance in dark mode?

A) Uses less CSS
B) Requires extra JavaScript processing
C) Dark mode does not affect performance significantly
D) Reduces HTML file size

Answer: Option C

Explanation: Bootstrap dark mode is implemented via CSS, so it has minimal impact on performance.

23.) What is a downside of using too many Bootstrap modals?

A) They take up extra space in HTML
B) They require extra CSS
C) They cannot be styled
D) Each modal adds additional JavaScript processing

Answer: Option D

Explanation: Bootstrap modals use JavaScript for transitions and animations. Too many modals increase script execution time.

24.) Why should Bootstrap’s .container class be used instead of custom width styles?

A) It makes pages load faster
B) It ensures consistent, responsive layouts
C) It removes unnecessary elements
D) It prevents JavaScript execution

Answer: Option B

Explanation: Bootstrap’s .container class is optimized for responsiveness, avoiding the need for custom width styles.

25.) How does Bootstrap improve web accessibility along with performance?

A) By using built-in ARIA attributes
B) By reducing CSS file sizes
C) By removing unnecessary styles
D) By converting all elements into text

Answer: Option A

Explanation: Bootstrap includes ARIA attributes (e.g., for modals, navigation, forms), ensuring better accessibility without affecting performance.

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