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प्रश्न
Guess whose tail is the longest. Now measure the tails. How good is your guess?
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उत्तर
I think the tail of the monkey is the longest.
Correct measurements are as follows:
| Animal | Lizard | Rat | Cat | Puppy | Monkey | Pig |
| Length of tail | 1.7 cm | 1.3 cm | 1.2 cm | 0.8 cm | 2.2 cm | 1.0 cm |
Hint: Use thread to measure the tails of animals given in the figure.
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संबंधित प्रश्न
Write true or false.
Every measurement involves two things – a number and a unit.
Match the following.
| Column A | Column B |
| (1) Length | a. kilogram |
| (2) Mass | b. cubic metre |
| (3) Area | c. metre |
| (4) Volume | d. square metre |
Fill in the blank.
In the ............ system, length is measured in centimetres.
Exercise
Answer the following question.
Star A is farther than star B. Which star will have a large parallax angle?
Complete the analogy.
Height of a person: cm :: Length of your sharpened pencil lead:______?
Fill in the following chart.
| Property | Definition | Basic Unit | Instrument used for measuring |
| Length | |||
| Mass | |||
| Volume | |||
| Time |
Rulers, measuring tapes and metre scales are used to measure ______
Difference in size 
Do this for yourself and find the difference.
You can play this game on the ground. Make two squares of one square meter each. Divide your class into two teams. Ready to play!
- How many of you can sit in one square meter?
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.
- What is the length of the boundary of lake B in the drawing?
In which SI unit, you can measure your height?
What formula is used to measure the area of your classroom?
What unit will you use to measure the length of our classroom?
Consider a sunlike star at a distance of 2 parsecs. When it is seen through a telescope with 100 magnification, what should be the angular size of the star? Sun appears to be (1/2)° from the earth. Due to atmospheric fluctuations, eye can’t resolve objects smaller than 1 arc minute.
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.
Why is Earth's orbit used instead of its diameter to measure distances to stars using the parallax method?
In the parallax formula D = b/θ, what must be true about the angle θ for the calculation to be correct?
The parallax method is used to measure astronomical distances because ______.
