मराठी

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? - Mathematics

Advertisements
Advertisements

प्रश्न

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
   
तक्ता

उत्तर

Guess its length
and draw
Measure of
your drawing
Measure of your
friend’s drawing
An ant of length
less than 1 cm
0.8 cm 1.4 cm
Pencil of length
about 7 cm
6.4 cm 7.2 cm
A glass 11 cm high with
water up to 5 cm
10.5 cm and 4.6 cm 8 cm and 4.5 cm
A bangle of perimeter
20 cm
18.9 cm 20.2 cm
A curly hair of length
16 cm
15 cm 16.6 cm
shaalaa.com
  या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
पाठ 10: Tenths and Hundredths - Tenths and Hundredths [पृष्ठ १३७]

APPEARS IN

एनसीईआरटी Math - Magic [English] Class 5
पाठ 10 Tenths and Hundredths
Tenths and Hundredths | Q 3 | पृष्ठ १३७

संबंधित प्रश्‍न

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.


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:______?


Can you find the diameter of a thin wire of length 2 m using the ruler from your instrument box?


Numerical Problem.

Inian and Ezhilan argue about the light year. Inian tells that it is 9.46 × 1015 m and Ezhilan argues that it is 9.46 × 10 12 km. Who is right? Justify your answer.


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 stand in it?

Chumki, Jhumri, and Imran need wire to make a fence.

  • How much wire in all will the three need?

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)

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 kilometers long is the actual boundary of lake A?

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.

  • Find the area of lake B on the drawing in square cm. What is its actual area in square km?

Length is a fundamental quantity.


Give some examples of larger length measures.


What is the unit of length?


The SI unit of mass is kg.


To measure the distance of a planet from the earth, ______ method is used.


In an experiment to estimate the size of a molecule of oleic acid 1 mL of oleic acid is dissolved in 19 mL of alcohol. Then 1 mL of this solution is diluted to 20 mL by adding alcohol. Now 1 drop of this diluted solution is placed on water in a shallow trough. The solution spreads over the surface of water forming one molecule thick layer. Now, lycopodium powder is sprinkled evenly over the film and its diameter is measured. Knowing the volume of the drop and area of the film we can calculate the thickness of the film which will give us the size of oleic acid molecule.

Read the passage carefully and answer the following questions:

  1. Why do we dissolve oleic acid in alcohol?
  2. What is the role of lycopodium powder?
  3. What would be the volume of oleic acid in each mL of solution prepared?
  4. How will you calculate the volume of n drops of this solution of oleic acid?
  5. What will be the volume of oleic acid in one drop of this solution?

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.


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×