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प्रश्न
Now cut strips of equal sizes out of it. Using tape join the strips, end to end, to make a belt.
How long is your belt? _________
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उत्तर
The belt is 84 cm long.
संबंधित प्रश्न
Just as precise measurements are necessary in science, it is equally important to be able to make rough estimates of quantities using rudimentary ideas and common observations. Think of ways by which you can estimate the following (where an estimate is difficult to obtain, try to get an upper bound on the quantity):
the number of strands of hair on your head
What are the S.I. units of
- mass
- length
- time and
- temperature.
Write their names and symbols.
Fill in the blank.
In the ............ system, length is measured in centimetres.
While measuring the length of an object using a ruler, the position of your eye should be
Rulers, measuring tapes and metre scales are used to measure ______
Can you find the diameter of a thin wire of length 2 m using the ruler from your instrument box?
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.
Which line is longer? C or D? Measure each line. How good is your guess?
Guess whose tail is the longest. Now measure the tails. How good is your guess?
Difference in size 
Do this for yourself and find the difference.
How wide is the rectangle? ________ cm
Arbaz plans to tile his kitchen floor with green square tiles. Each side of the tile is 10 cm. His kitchen is 220 cm in length and 180 cm wide. How many tiles will he need?
Can you think of how to cut a postcard so that you can pass through it?
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.
- Find the area of lake B on the drawing in square cm. What is its actual area in square km?
What is the unit of measurements of very small lengths?
Yard was used as the unit of length.
The SI unit of mass is kg.
In the parallax formula D = b/θ, what must be true about the angle θ for the calculation to be correct?
What is the SI unit of length?
Why is the speed of light used to define the metre?
