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The SI system consists of seven fundamental units, including one angular unit.
False
An angstrom (Å) is equivalent to $10^{-9}$ cm.
False
Fermi (f) is a unit of length equivalent to $10^{-12}$ m.
False
Positive zero error in Vernier callipers is added to the observed reading for correction.
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The principle of a screw gauge involves the main parts known as the barrel and thimble.
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Vernier callipers are also referred to as digital calipers due to their advanced technology.
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The pitch of a screw gauge is the linear distance moved by its screw on the circular scale when the main scale completes one full rotation.
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The least count of a screw gauge is calculated by dividing the pitch of the screw by the total number of divisions on the main scale.
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Positive zero error in a screw gauge occurs when the zero mark of the circular scale is above the base line of the main scale.
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Negative zero error in a screw gauge happens when the zero mark of the circular scale is below the base line of the main scale.
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The correction due to zero error is calculated by adding the observed reading and the zero error.
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Backlash error in a screw gauge is caused by the immediate movement of the screw tip in the opposite direction upon reversing the rotation of the thimble.
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