While measuring the length of an object, if the zero mark of a scale does not coincide with one of the ends of the object, then such an error is called _____ error.

parallax

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zero

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instrumental

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(a) and (b) above.

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Solution

The correct option is B zero
When the zero mark on the scale exactly coincides with one end of the object, then the measurement is said to have no zero error. However, if there is a shift, zero error will be equal to the length by which the end of the object has shifted from the zero mark.

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In a vernier callipers, there are 10 divisions on the vernier scale and 1 cm on the main scale is divided in 10 parts. While measuring a length, the zero of the vernier lies just ahead of 1.8 cm mark and 4th division of vernier coincides with a main scale division.

(a) Find the length.

(b) If zero error of vernier callipers is - 0.02 cm, what is the correct length ?

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While measuring the length of an object, if the zero mark of a scale does not coincide with one of the ends of the object, then such an error is called _____ error.

The correct option is B zeroWhen the zero mark on the scale exactly coincides with one end of the object, then the measurement is said to have no zero error. However, if there is a shift, zero error will be equal to the length by which the end of the object has shifted from the zero mark.

The correct option is B zero
When the zero mark on the scale exactly coincides with one end of the object, then the measurement is said to have no zero error. However, if there is a shift, zero error will be equal to the length by which the end of the object has shifted from the zero mark.