Advertisements
Advertisements
Question
Now guess the length and width of many other things. Measure and find the difference between your measure and your guess.
| Size of | Your guess in cm | Your measure in cm | ||
| Length | Width | Length | Width | |
| 100 Rupee note | ||||
| 10 Rupee note | ||||
| 20 Rupee note | ||||
| 5 Rupee note | ||||
| Post card | ||||
| Math-Magic book | ||||
Advertisements
Solution
| Size of | Your guess in cm | Your measure in cm | ||
| Length | Width | Length | Width | |
| 100 Rupee note | 16.2 | 7.0 | 15.5 | 7.3 |
| 10 Rupee note | 13.0 | 6.0 | 13.7 | 6.3 |
| 20 Rupee note | 15.0 | 6.5 | 14.8 | 6.3 |
| 5 Rupee note | 11.5 | 6.5 | 11.7 | 6.3 |
| Post card | 14.0 | 9.0 | 14.5 | 9.5 |
| Math-Magic book | 28.0 | 22.0 | 28.5 | 21.5 |
Difference between my guess and measurement
| Size of | Difference in cm | |
| Length | Width | |
| 100 Rupee note | 0.5 cm | 0.3 cm |
| 10 Rupee note | 0.7 cm | 0.3 cm |
| 20 Rupee note | 0.2 cm | 0.2 cm |
| 5 Rupee note | 0.5 cm | 0.2 cm |
| Post card | 0.5 cm | 0.5 cm |
| Math-Magic book | 0.5 cm | 0.5 cm |
APPEARS IN
RELATED QUESTIONS
The farthest objects in our Universe discovered by modern astronomers are so distant that light emitted by them takes billions of years to reach the Earth. These objects (known as quasars) have many puzzling features, which have not yet been satisfactorily explained. What is the distance in km of a quasar from which light takes 3.0 billion years to reach us?
When the planet Jupiter is at a distance of 824.7 million kilometres from the Earth, its angular diameter is measured to be 35.72″ of arc. Calculate the diameter of Jupiter
Write true or false.
Every measurement involves two things – a number and a unit.
Fill in the blank.
In the ............ system, length is measured in centimetres.
Exercise
500 gm = ______ kilogram.
While measuring the length of a sharpened pencil, the reading of the scale at one end is 2.0 cm and at the other end is 12.1 cm. What is the length of the pencil?
Have you seen frogs? Where? How many different types of frogs have you seen? Are all the frogs of the same length? Here are two interesting examples.
Guess the lengths to draw these things. Ask your friend to draw the same. After you make the drawing use a scale to measure the length. Whose drawing showed a better guess?
| Guess its length and draw |
Measure of your drawing |
Measure of your friend’s drawing |
| An ant of length less than 1 cm |
||
| Pencil of length about 7 cm |
||
| A glass 11 cm high with water up to 5 cm |
||
| A bangle of perimeter 20 cm |
||
| A curly hair of length 16 cm |
What is the length of a 100 rupee note? Guess. Now measure it using a scale.
There are two beautiful lakes near a village. People come for boating and picnics in both the lakes. The village Panchayat is worried that with the noise of the boats the birds will stop coming. The Panchayat wants motorboats in only one lake. The other lake will be saved for the birds to make their nests.
- A longer boundary around the lake will help more birds to lay their eggs. So which lake should be kept for birds? Which lake should be used for boats?
There are two beautiful lakes near a village. People come for boating and picnics in both the lakes. The village Panchayat is worried that with the noise of the boats the birds will stop coming. The Panchayat wants motorboats in only one lake. The other lake will be saved for the birds to make their nests.
- A longer boundary around the lake will help more birds to lay their eggs. So which lake should be kept for birds? Which lake should be used for boats?
What are the materials needed to find the length of a banana?
Give some examples of larger length measures.
What is the unit of measurements of very small lengths?
SI unit of electric current is ______.
Larger unit for measuring time is ______.
The SI unit of mass is kg.
The distance of a galaxy is of the order of 1025 m. Calculate the order of magnitude of time taken by light to reach us from the galaxy.
Mars has approximately half of the earth’s diameter. When it is closest to the earth it is at about 1/2 A.U. from the earth. Calculate what size it will appear when seen through the same telescope.
