Which of the following statements about antenna classification is correct? (Multiple choice)

Question

Options

• AClassified by directionality: omnidirectional antenna, directional antenna, etc.
• BClassified by shape: linear antenna, planar antenna, etc.
• CClassification by use: short wave antenna, ultrashort wave antenna, microwave antenna, etc.
• DClassified by working frequency band: communication antenna, TV antenna, radar antenna, etc.

• A
  81% (21)
• C
  8% (2)
• D
  12% (3)

Explanation

Options A and B correctly pair classification criteria with matching examples: directionality (omnidirectional vs. directional) and physical shape (linear vs. planar) are both legitimate and widely used ways to categorize antennas.

Options C and D are each other's mistakes in disguise - their labels and examples are swapped. C claims to classify "by use" but lists frequency bands (short wave, ultrashort wave, microwave), which is actually frequency-band classification. D claims to classify "by working frequency band" but lists application types (communication, TV, radar), which is actually classification by use.

Memory tip: Watch for mismatched label–example pairs on classification questions. If the examples don't match the stated criterion, the option is wrong - here, just mentally swapping C and D's labels turns them both into correct statements, which is a strong hint the exam is testing whether you notice the mismatch.

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