Essay type test are not reliable because

Solution (By Examveda Team)

Option A: Their answers are different
While it's true that students may provide different answers to essay questions, this diversity is not the primary reason for the unreliability of essay tests. Differences in answers are expected in any subjective test and can reflect the student's understanding and perspective. However, it doesn't directly impact the reliability of the scoring process.

Option B: Their results are different
The variation in results can occur in any type of test, but for essay tests, the unreliability stems from the inconsistency in grading rather than the differences in student performance. Multiple-choice tests, for example, can also yield different results for different students, but they are generally considered more reliable because of their objective scoring.

Option C: Their checking is affected by examiner's mood
This is the main reason for the unreliability of essay tests. The subjective nature of grading essays means that an examiner's mood, biases, and personal opinions can significantly influence the scores given. This variability can lead to inconsistent and unreliable results, as the same essay could receive different grades from different examiners or even from the same examiner at different times.

Option D: Their responding styles are different
Different students may have different styles of writing and expressing their thoughts. While this can affect the way their answers are perceived, it is not the primary reason for the unreliability of essay tests. The key issue is the subjective nature of grading and the potential for examiner bias, not the variety in student responses.

Conclusion
Essay type tests are not reliable mainly because their checking is affected by the examiner's mood, biases, and personal judgments, leading to inconsistent and unreliable scoring.