SSC
PHYSICS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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meniscus error
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random error
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zero error
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parallax error
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Detailed explanation-1: -A meniscus occurs because of surface tension in the liquid and must be read at eye level. For a concave meniscus, the correct volume will be read at the bottom of the curve.
Detailed explanation-2: -You must be at eye level with the bottom of the meniscus (curved surface of liquid) to read the burette. Reading from above or below the meniscus will result in a parallax error. In order to better read the meniscus, keep a dark piece of paper behind the buret.
Detailed explanation-3: -Parallax errors: This type of error occurs when the scale of the buret is not viewed from a perpendicular position. Looking down on the meniscus causes it to appear higher than where it really is. Looking up at the meniscus causes it to appear lower than it really is.