# Zero Error and Correct Way to Measure Length

## Trending Questions

**Q.**

How people in ancient times measured length, mass and time?

**Q.**

Why could you not use an elastic measuring tape to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with an elastic tape? [5 MARKS]

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**Question 19**

Three students measured the length of a corridor and reported their measurements. The values of their measurements were different. What could be the reason for the difference in their measurements?

**Q.**

Question 7

Four pieces of wooden sticks A, B, C and D are placed along the length of 30 cm long scale as shown in Fig. Which one of them is 3.4 cm in length?

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Question 15

Four children measure the length of a table which was about 2 m. Each of them used different ways to measure it.

(i) Sam measured it with a half metre long thread.

(ii) Gurmeet measured it with a 15 cm scale from her geometry box.

(iii) Reena measured it using her hand span.

(iv) Salim measured it using a 5 m long measuring tape.

Which one of them would get the most accurate length? Give reason for your answer.

**Q.**

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Question 9

You are provided three scales A, B and C as shown in Fig. to measure a length of 10 cm.

For the correct measurement of the length, you will use the scale,

(a) A only

(b) B only

(c) C only

(d) Any of three scales

**Q.**

A piece of ribbon folded five times is placed along a 30 cm long measuring scale as shown in figure. The length of the ribbon is between (a) 1.15 m – 1.25 m (b) 1.25 m – 1.35 m (c) 1.50 m – 1.60 m (d) 1.60 m – 1.70 m.

**Q.**

A ______ is the fixed quantity that is used as a standard for measuring physical quantities.

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Question 8

Which of the following figure shows the correct placement of a block along a scale for measuring its length?

(a)

(b)

(c)

(d)

**Q.**The given figure shows a ruler represented in millimeters (mm). It is used to measure the length of the pencil. Determine the length of the pencil in centimeters.

- 0.75 cm
- 75 cm
- 7.5 cm
- 0.075 cm

**Q.**How to measure the length of a pencil by using a ruler?

[2 marks]

**Q.**

Three students measured the length of a corridor and reported their measurements. The values of their measurements were different. What could be the reason for the difference in their measurements?

**Q.**

Ten similar coins were stacked one above the other. When measured with a scale, the readings at the top and bottom were $1.5cm$ and $4cm$ respectively. What is the thickness of each coin?

**Q.**

If we have a metre scale, then how many divisions do we need to make such that each division is equal to a centimetre?

20

100

10

1000

**Q.**

**Question 8**

Which of the following figure shows the correct placement of a block along a scale for measuring its length?

(a)

(b)

(c)

(d)

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

- 30 cm
- 1 cm
- 29 cm
- 59 cm

**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.

- zero
- instrumental
- (a) and (b) above.
- parallax

**Q.**

**Question 9**

You are provided three scales A, B and C as shown in Fig. to measure a length of 10 cm.

For the correct measurement of the length, you will use the scale,

(a) A only

(b) B only

(c) C only

(d) Any of three scales

**Q.**

**Question 4**

A piece of ribbon folded five times is placed along a 30 cm long measuring scale as shown in Fig.

The length of the ribbon is between:

(a) 1.15 - 1.25 m

(b) 1.25 - 1.35 m

(c) 1.5 - 1.6 m

(d) 1.6 - 1.70 m

**Q.**Metre scale is used to measure _______

**Q.**Three students measured the length of a corridor and reported their measurements. The values of their measurements were different. What could be the reason for the difference in their measurements? [5 MARKS]

**Q.**

- 100
- 10
- 1
- 1000

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

- Parallax error
- Zero error
- Numerical error
- Angular error

**Q.**

- 100
- 10
- 1
- 1000

**Q.**

1 metre can be defined as distance travelled by light in 1299792458 seconds in vacuum.

- True
- False

**Q.**One end of the scale has reading 3.5 cm and the other end has 15 cm. What is the actual value of the measurement?

- 0 cm
- 11.5 cm
- 3.5 cm
- 15 cm

**Q.**Which of the following is not necessary while measuring length ?

- Placing the scale in contact with the object along its length.
- Using full mark of the scale which is not broken.
- Placing the eye exactly in front of the point where the measurement is to be taken
- Using clean hands to make measuements

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

- 1 cm
- 30 cm
- 29 cm
- 59 cm

**Q.**You are provided three scales A, B and C as shown in Fig. to measure a length of 10 cm.

For the correct measurement of the length, you will use the scale:

- A only
- B only
- C only
- Any of the three scales