Advertisements
Advertisements
Question
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.
- How many cm is the length of the boundary of lake A in the drawing?(use thread to find out)
Advertisements
Solution
When we measure the boundary of lake A with the help of a thread, it comes out to be around 30 cm.
APPEARS IN
RELATED QUESTIONS
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
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.
Solve the numerical example.
When the planet Jupiter is at a distance of 824.7 million kilometers from the Earth, its angular diameter is measured to be 35.72'' of arc. Calculate the diameter of Jupiter.
500 gm = ______ kilogram.
Length of one’s chest can be measured using metre scale.
Match the following.
| 1. | Length | kelvin |
| 2. | Mass | metre |
| 3. | Time | kilogram |
| 4. | Temperature | second |
Assertion (A): Distance between two celestial bodies is measured in terms of light year.
Reason (R): The distance travelled by the light in one year is one light year.
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.
Difference in size 
Do this for yourself and find the difference.
What is Dinesh’s height in metres? _____ m _____ cm.
How wide is the rectangle? ________ cm
The fencing of a square garden is 20 m in length. How long is one side of the garden?
Can you think of how to cut a postcard so that you can pass through it?
Chumki, Jhumri, and Imran need wire to make a fence.
- How much wire in all will the three need?
Yard was used as the unit of length.
To measure the distance of a planet from the earth, ______ method is used.
Why is Earth's orbit used instead of its diameter to measure distances to stars using the parallax method?
Which instruments are used to measure very small distances at the atomic scale?
