Does usage of whitener in omr sheet affect the results?

Yes. Using whitener on an OMR sheet can affect the results. OMR machines scan the sheets using optical sensors, which can be affected by the presence of whitener. The whitener can cause the machine to misread the marks, resulting in incorrect data capture.

Here's how using whitener can affect OMR sheet results:

1. Reflection: OMR sheets are designed to be filled in with marks made by a pencil. The pencil marks are made of graphite, which reflects light. When the OMR machine scans the sheet, it detects these reflected light patterns and records the data accordingly. However, whitener is typically white and opaque, so it reflects light differently from pencil marks. This can confuse the optical sensors and lead to incorrect readings.

2. Smudging: Whitener can smudge when it is applied to OMR sheets, especially if the sheet is not completely dry. This can cause marks to appear in places where they shouldn't be, leading to further errors in data capture.

3. Thickness: Whitener can also make the paper thicker in the areas where it is applied. This variation in thickness can affect the way the OMR machine feeds and scans the sheet, potentially causing the machine to misalign the marks or skip some sections altogether.

4. Contrast: OMR sheets rely on contrast to distinguish between marks and blank spaces. Whitener can reduce the contrast between marks and the paper, making it difficult for the optical sensors to accurately detect the marks. This can result in marks being missed or misinterpreted.

To ensure accurate results, it is important to fill OMR sheets with the appropriate writing instrument and avoid using any type of whitener.