Errors in Measurements

Q.

What is a parallax error? How can it be avoided?

Q.

Assertion (A): The accuracy of a measuring device increases with the decrease in its least count.
Reason (R): The least count is the smallest length that can be measured using a measuring device.

1. A and R are true and R is the correct explanation of A.

2. A and R are true, but R is not the correct explanation of A.

3. A is true but R is false.

4. Both A and R are false.

Q.

The position of the eye is very important for taking measurements. There might be an error in the reading if our eye position is not proper. This error is known as ___ error.

1. parallax

2. zero

3. instrumental

4. Both A and B

Q.

What is the least count not of a measuring instrument?

Q.

From a broken scale, measurement can be done from zero mark.

1. True
2. False

Q.

The divider is used to compare lengths

1. True
2. False

Q.

How will you measure the length of a curved line?

Q.

Look at a meter scale carefully and answer the following questions.

How many cm are there in a meter.

Q.

Two students are measuring a particular length using the same scale. The result will be always the same.

1. True

2. False

Q. Rajesh measures the length of a box to be $30cm$ using a scale that has a broken left end. The actual length of the box is $29cm$. What is the zero error?

1. 1

Q.

Look at a metre scale carefully and answer the following question: How many $mm$ are there in a $cm$?

Q. A pencil is placed next to a ruler such that the ends of it, are at $6.2\text{cm}$ and $13.9\text{cm}$ markings on the ruler. What is the length of the pencil?

1. $6.7\text{cm}$
2. $8.3\text{cm}$
3. $7.3\text{cm}$
4. $7.7\text{cm}$

Q.

Correct position of the eye is very important for taking measurements. There might be error in the reading, if our eye is not completely in front of the mark. This error is known as___ error.

Q. The error that occurs when the length of an object is measured using a scale that has damaged zero mark is called:

1. Numerical error
2. Angular error
3. Parallax error
4. Zero error

Q. Why we have two eyes ?

Q. 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.

1. instrumental
2. (a) and (b) above.
3. parallax
4. zero

Q. Which of the following has to be used to measure the length of a curved line?

1. A metre scale and a thread.
2. Only a metre scale.
3. Only a thread.
4. Only a graph paper.

Q. Ashwin is required to take the measurement of a wooden box. Which of the following should be the proper position of his eye for taking the reading?

1. 
2. 
3. 
4. 

Q. arises when the reading of a scale is taken from a random angle.

1. Zero error
2. Angle error
3. Parallax error
4. Numerical error

Q.

The length of a curved line can be measured using a