How can a measured length be expressed? - Science

Short Note

How can a measured length be expressed?



  1. A number describing the numerical value.
  2. The unit in which that quantity is measured.
Concept: Devices for Measuring Length
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Fill in the blank:

The S.I. unit of length is ............ of time is ............ of mass is ............

Describe in steps how would you measure the length of a pencil using a metre rule. Draw a diagram if necessary.

State if the following statement is true or false: 

In ancient times, a cubit was used to measure the mass of an object.

Answer the following in short.

Which unit will you use to find the length of your notebook and why?

State if the following statement is true or false. Correct the statement if it is false.

A ruler with a damaged end can be used to measure a length accurately.

Why can hand span and arm length not be used as standard units of length?

Name the device used to measure the following:

Your weight.

Name the device used to measure the following:

Circumference of round table.

State two precautions to be observed while measuring length with the help of a metre scale.

One metre is ______ cm.

Five kilometre is ______ m.

The area can be calculated by using the two lengths and width.

Match the following:

1. Length a. Litre
2. Mass b. Seconds
3. Time c. Kilogram
4. Volume of liquid d. Metre

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?

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

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

  1. Sam measured it with a half metre long thread.
  2. with a 15 cm scale from her geometry box.
  3. Reena measured it using her hand span.
  4. 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.

While travelling in a train, it appears that the trees near the track are moving whereas co-passengers appear to be stationary. Explain the reason.


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