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Caching And Debugging MCQs

Practice Caching And Debugging MCQs for competitive exams.

Caching And Debugging MCQs

Practice questions from this topic.

Which of the following attribute takes the source of the PHP file?

  1. A. img
  2. B. src
  3. C. source
  4. D. none of the mentioned
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Which of the following is possible to be referenced in external JavaScript?

  1. A. cpp
  2. B. cs
  3. C. php
  4. D. all of the mentioned
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Which of the following is added to prefs.js when the console is automatically opened during JavaScript error?

  1. A. user_pref("javascript.console.open_on_error", true)
  2. B. user_pref("javascript.console.open_error ", true)
  3. C. user_pref("javascript.console.open_error ", false)
  4. D. user_pref(" javascript.console.open_on_error", false)
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What are the two parts of JavaScript libraries?

  1. A. “script” tag and “body” tag
  2. B. External JavaScript and the “script” tag
  3. C. “html” tag and “body” tag
  4. D. None of the mentioned
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In which format does JavaScript support external JavaScript?

  1. A. .js
  2. B. .php
  3. C. .js/php
  4. D. .jss
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Which of the following is a way to retain an object in memory?

  1. A. Console Log
  2. B. Closures
  3. C. Destory objects
  4. D. All of the mentioned
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When does a cycle occur during memory leak?

  1. A. No reference occurs
  2. B. Two objects reference
  3. C. One object gets referenced
  4. D. None of the above
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What is the purpose of destroying the functions and objects?

  1. A. Consume unnecessary CPU cycles
  2. B. Prevent the dropping of reference count to 0
  3. C. Centralize the responsibility to clean up
  4. D. All of the mentioned
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Which of the following functions are referenced internally?

  1. A. setTimeout
  2. B. setInterval
  3. C. both setTimeout and setInterval
  4. D. none of the mentioned
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When does a memory leak happen?

  1. A. Browser doesn’t release memory from objects unnecessary
  2. B. Browser releases too many memories
  3. C. All of the mentioned
  4. D. None of the mentioned
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What is the central concept of JavaScript memory management?

  1. A. Reliability
  2. B. Reachability
  3. C. Efficiency
  4. D. Transparency
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Where are memory leaks found?

  1. A. Client side objects
  2. B. Server side objects
  3. C. Both Client side and Server side objects
  4. D. None of the mentioned
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