YADNYA e-Learning: January 2021

Sunday, January 31, 2021

6th Std Science 16 The Universe l Question and Answer

YADNYA e-Learning

Science Studies - 6th Standard

16. The Universe

Question And Answer

1. Name these -

(a) Birth place of stars

Ans: Huge nebulae made up of dust particles and gases.

(b) Biggest planet in the solar system

Ans: Jupiter

Ans: The Andromeda galaxy

(d) Brightest planet in the solar system

Ans: Venus

(e) Planet with largest number of satellites

Ans: Jupiter

(f) Planets without a single satellite

Ans: Mercury and Venus

(g) Planet with a rotation different from other planets.

Ans: Venus

(h) A celestial body that carries a tail along.

Ans: Comet

2. Fill in the blanks.

(a) The group of galaxies of which our Milky Way is a part is

called local group.

(b) Comets are made of frozen matter and dust particles.

(d) Jupiter is a stormy planet.

(e) The Pole Star is the best example of a variable type of star.

3. Say if the statements given below are right or wrong. Rewrite the statements after correcting them.

(a) Venus is the planet closest to the sun- Wrong

Correct Statement- Mercury is the planet closest to the sun.

(b) Mercury is called a stormy planet- Wrong

Correct Statement- Jupiter is called stormy planet.

4. Answer the following.

(a) What is a special characteristic of the planet Mars ?

Ans: It is the fourth planet in the solar system. As soil on Mars

contain iron its colour is reddish. It also called as Red planet.

The highest and longest mountains in the solar system Olympus Mons is located on Mars.

(b) What are the types of galaxies ?

Ans: There are four types of galaxies- Spiral, Elliptical, Barred

spiral, Irregular

Ans: A group of innumerable stars and their planetary system

are together known as galaxy. It includes celestial bodies

such as clusters of stars, nebulae, clouds of gases, clouds of

dust, dead stars, newly born stars etc. The milky way is the

galaxy in which our solar system is located. The milky way is

a part of the local group of galaxies. It includes many stars

smaller than our sun as well as many other than are

thousands of times biggest than sun.

(d) Name the different types of stars.

Ans: Some types of Stars are- Sun-like star, Red giants stars,

Super Nova, Binary or Twin stars, Variable stars.

(e) What are the types of comets and on what basis are they

classified ?

Ans: A comet is a celestial body that revolves around the sun.

Comets are formed out ice and dust particles. They are part

of the solar system. There are two types of comets based on

the time taken by them to complete revolution around sun.

i) Long periodic comets: These comets take more than

200 years to complete one revolution around the sun.

ii) Short period comets: These comets take less than 200

years to complete one revolution around the sun

(f) What is the difference between meteors and meteorites ?

Ans:

(g) What are the characteristics of the planet Neptune ?

Ans: It is eight planet in solar system. A season on Neptune

lasts for about 41 years. On this planet winds blows with

the extremely high speed. It has 13 satellites. It takes 164

years for one revolution around the sun and 16 hours and

11 minutes to rotate around itself.

5. Match the following.

6th Std Science 15 Fun with Magnets l Question and Answer

YADNYA e-Learning

Science Studies - 6th Standard

15. Fun with Magnets

Question And Answer

1. How will you do this ?

(a) Determine whether a material is magnetic or non magnetic.

Ans: If a material sticks to a magnet then it is a magnetic material otherwise it is a non-magnetic material.

(b) Explain that a magnet has a certain magnetic field.

Ans: A magnet has a certain magnetic field which can be

demonstrated using the below activity. Take a cardboard and sprinkle some iron filings on it. Notice the position of the iron filings as a whole. Now take a bar magnet and slowly bring it below the cardboard. You will observe that the iron filings tend to attract towards the magnet and align themselves as shown. It represents that the magnet exerts a force around its body with a stronger force near the two poles. This regular pattern of the iron filings on the board represents the lines of magnetic field. Thus a

magnet has a certain magnetic field which can be represented by curved lines around a magnet.

Ans: Tie a thread to the centre of a magnet and hang it from a stand as shown. Wait till the magnet settles itself.

2. Which magnet will you use ?

(a) Iron is to be separated from trash.

Ans: Electromagnet can be used to separate iron from trash.

(b) You are lost in a forest.

Ans: Bar magnet or loadstone can be used to find the direction in the forest. This is because a bar magnet when suspended freely always rests in north-south direction.

wind.

Ans: Permanent magnet can be used to stop the continuous shuttering of the window in the wind.

3. Fill in the blanks with the appropriate word.

(a) If a bar magnet is hung by a thread tied at its centre, its north pole becomes steady in the direction of the north Pole of the earth.

(South, north, east, west)

(b) If a bar magnet is cut into equal pieces by cutting it at right

angles to its axis at two places, 3 bar magnets are formed, and

a total of 6 poles are formed.

(6,3,2)

attraction between its opposite poles.

(opposite, like.)

(d) When magnetic material is taken close to a magnet, the

material acquires induced magnetism.

(permanent magnetism, induced magnetism)

(e) If a magnet attracts a piece of metal, that piece must be made of magnetic material or iron.

(any other metal but iron, magnetic material or iron, non magnetic material)

(f) A magnet remains steady in a north-south direction.

(east-west, north-south)

4. Write the answers in your words.

(a) How is an electromagnet made ?

Ans: When an iron object is wounded with copper wire and current is passed through the wire, the magnetism is produced in the object. This is how temporarily electromagnetism is produced.

(b) Write the properties of a magnet.

Ans: Properties of a magnet are as fallows-

1) Magnet always settles in north south direction.

2) Unlike poles of magnet attach each other while like poles repel each other.

3) The magnetic force is concentrated at the two ends or poles of a magnet.

4) A magnetic material acquires magnetism when placed near a magnet. This magnetism is called induced magnetism.

Ans: The uses of a magnet:

1) Magnets are used in big cranes to remove large metal

pieces.

2) Magnetic needle is used in compass to find direction.

3) They are used in generators.

4) Magnetic materials are also used to store data in hard

disk of a computer, an audio or video tape etc.

6th Std Science 14 Light and the Formation of Shadows l Question and Answer

YADNYA e-Learning

Science Studies - 6th Standard

14. Light and the Formation of Shadows

Question And Answer

1. Choose an appropriate word and fill in the blanks.

(a) A star is a natural source of light.

(b) A candle is an artificial source of light.

seven colours.

(d) The image obtained in the pinhole camera is inverted .

(e) A shadow is formed when an opaque object comes in the

way of light.

(f) When a transparent object comes in the way of light, light

passes through it.

(options : seven, star, through, transparent, opaque, colors,

shape, erect, inverted, luminous, candle)

2. Write whether of the following objects are luminous or

non-luminous.

3. Match the following.

4. Write the answers to the following.

(a) What things are necessary for the formation of a shadow?

Ans: The shadow of an object is formed only when light does

not pass through the object. The kind of shadow is forms

depends upon the relative distance between the source of

light, the object and the surface of the screen on which the

shadows is formed.

(b) When can an object be seen ?

Ans: We see the object when the reflected rays reach our

eyes. The rays of light falling on an object from a source of

light are thrown back from the surface of that object. This is

reflection of light.

Ans: When an opaque object comes in the way of light

source, light does not pass through it. The light does not

reach a wall or any other surface on the other side of the

object. This part remains dark, this part is called shadow of

the object.

Thursday, January 28, 2021

5th Std EVS 2 Chapter 10 Historic Period l Question and Answer

YADNYA e-Learning

Environmental Studies-2 - 5th Standard

10. Historic Period

Question And Answer

1. Answer each of the following questions in one sentence.

(a) Where did the people in the New Stone Age establish their villagesettlements?

Ans: The people in the new stone age established their village settlements on the banks of rivers.

(b) What articles were the Harappan craftsmen skilled at making?

Ans: The Harrappan craftsmen were highly skilled in making bronze objects and beads from semi-precious stones of different colours.

2. Answer the following questions in brief.

(a) What are some of the well-known characteristics of Harappan cities?

Ans: 1) Cities of this civilization are well-known for their systematic town planning.

2) The houses were built in blocks created by parallel roads that crossed each other at right angles.

3) Huge granaries and spacious houses were the special features of these cities.

4) There were bathrooms and latrines in every house and a covered drainage system which indicates a concern for public hygiene.

5) There were carefully constructed private and public wells. The cities were divided into two to four parts, each with a separate fortification.

(b) What made the soil on the banks of the Nile fertile?

Ans: The Nile gets flooded every year. The land along her banks has become very fertile because of the flood deposits.

3. Complete the following chart.

5th Std EVS 2 Chapter 9 Settled Life and Urban Civilization l Question and Answer

YADNYA e-Learning

Environmental Studies-2 - 5th Standard

9. Settled Life and Urban Civilization

Question And Answer

1. From the chart below, find out the names of the three periods into which ancient objects are classified and use them to match the three classes given below.

(a) Stone tools : Stone Age.

(b) Copper tools and other copper objects : Copper Age.

2. Arrange the following in chronological order.

(a) (1) Copper (2) Gold (3) Iron

Ans: (1) Gold (2) Copper (3) Iron

(b) (1) Copper Age (2) Iron Age (3) Stone Age

Ans: (1) Stone Age (2) Copper Age (3) Iron Age

3. Write about the consequences of the following events.

(a) Discovery of copper :

Ans: Copper was used for making tools and implements by human.

(b) Invention of the wheel :

Ans: Wheel was first used by the potters and for running bullock carts and chariots.

Ans: Script is used for permanent record-keeping production and other events.

4. Write notes.

(a) Use of metals

Ans: Gold was the first metal used by man, However gold is a soft metal. It cannot be used for making tools and implements. Copper and Iron were used for making tools and implements.

(b) Social organization in the ancient cities

Ans: The culture of those cities had its roots in the culture of village settlements of the New Stone Age. The faith system rooted in the agricultural way of life continued in the urban way of life too. The social life and festivals based on agricultural faith systems became more elaborate in cities that had prospered because of the rise in trade. Grand temples were built in many cities. Chiefs of those temples became chief administrators of those cities. Later, the positions of the temple head and that of the king went to the same individual.

5th Std EVS 2 Chapter 8 Beginning of Settled Life l Question and Answer

YADNYA e-Learning

Environmental Studies-2 - 5th Standard

8. Beginning of Settled Life

Question And Answer

1. Fill in the blanks.

(a) Archaeological evidence shows that, agriculture first began about 11,000 years ago in Israel and Iraq.

(Iran, Iraq, Dubai)

(b) The houses at the beginning of the New Stone Age were made of wattle and daub.

(earth, bricks, wattle and daub)

2. Answer the following questions in brief.

(a) What are the three main steps in the process of domesticating a wild animal?

Ans: The three main steps in the process of domesticating a wild animal are:

1) Capture of the wild animals.

2) Taming the captured animals that is training them to live with human.

3) Obtaining useful materials like milk etc from them and training them to work for human as beasts of burden.

(b) How did some people in the community become skilled

craftsmen?

Ans: The farmers in the village settlement were producing surplus food they needed skilled craftsman for task like making agricultural implement and repairing them such craftsmen were paid in the form of food grains or other article.

3. Complete the following concept chart.

4. Write about the usefulness of any five domesticated animals.

Ans: 1) Dog- Protect our house

2) Donkey- For travelling and carry heavy loads

3) Horse- Used for farming and travelling

4) Cow- Giving milk to us and helps to plough the land

5) Sheep- Gives wool

5. Which animal is used by the modern police? In what way?

Ans: Dog is used by a modern police, because it has a good sense of smell and can sense bombs, drugs and other explosions set by the thieves. They play very important role in police investigation.

5th Std EVS 2 Chapter 7 From Shelters to Village-settlements l Question and Answer

YADNYA e-Learning

Environmental Studies-2 - 5th Standard

7. From Shelters to Village-settlements

Question And Answer

1. Answer each of the following questions in one sentence.

(a) Which animals did the Homo sapiens mainly hunt?

Ans: Homo sapiens mainly hunt sheep, deer, wild boar, mountain goat and fish.

(b) What is the characteristic of the New Stone Age?

Ans: The beginning of cultivation is the characteristic of new stone age.

2. Give reasons for the following.

(a) The diet of Homo sapiens underwent a change.

Ans: The diet of homo sapiens underwent a change because of the changes in the environmental condition.

(b) Homo sapiens needed to stay in one place over longer periods of time.

Ans: Homo sapiens needed to stay in one place over longer periods of time, because there they harvested seasonal wild grains and seasonal fruits and roots. They would find out best season for fishing and gather knowledge for their benefits. By observation they built best hunting grounds.

3. Observe the reconstructed picture of a Middle Stone Age seasonal camp and answer the following.

(a) Describe the structure of the houses in the picture.

Ans: Houses are small like tents and huts.

(b) What materials are used to construct the houses?

Ans: Houses are constructed with wood, thatch and animal hides to keep it warmth.

Ans: The seasonal camps they have been doing animal hunting, fishing, agriculture etc.

4. Write about the effects on your life, of the seasonal changes in weather.

Ans: The seasonal changes in weather result in changes in clothing. We wear warm clothes during winter and cotton clothes in summer. The seasonal changes in climate make us sick sometimes.

5. Compare the New Stone Age village with a modern village.

Ans:

New Stone Age Village	Modern Village
Houses of new stone age were of animal hides.	Houses of modern village are made up of wood, stone, cement etc.
In new stone age food crops were cultivated with manpower and animals.	In modern village modern machines are used for cultivation.
There were no proper roads in new stone age	There were cement roads have been developed.