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CBSE Class 9 Computer Applications Question 17 of 21

Input and Output Devices — Question 18

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Question

Question 18

A laser printer uses ............... .

  1. Heat sensitive paper
  2. Spray ink
  3. Photocopy technology
  4. None of these
Answer

Photocopy technology

Reason — A laser printer uses Photocopy technology.

Source: This question is from Input and Output Devices, Computer Applications — Class 9, CBSE Board.

Key Concepts Covered

This question tests your understanding of the following concepts from the chapter Input and Output Devices: Question, Laser, Printer, Uses, Heat, Sensitive. These are fundamental topics in Computer Applications that students are expected to master as part of the CBSE Class 9 curriculum.

A thorough understanding of these concepts will help you answer similar questions confidently in your CBSE examinations. These topics are frequently tested in both objective and subjective sections of Computer Applications papers. We recommend revising the relevant section of your textbook alongside practising these solved examples to build a strong foundation.

How to Approach MCQs

Multiple choice questions test your ability to quickly recall facts and apply concepts. Read all options carefully before selecting your answer. Use the process of elimination to rule out clearly incorrect options first. If two options seem similar, look for the subtle difference that makes one more accurate. For numerical MCQs, verify your answer by substituting it back into the problem.

Key Points to Remember

  • Write programs with proper indentation and comments.
  • Trace through your code with sample inputs to verify correctness.
  • Explain the logic behind each step of your solution.
  • Familiarise yourself with common library functions and methods.

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