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

(c) The galaxy which is our neighbour.

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.

(c) The planet Uranus appears as if it is rolling along its orbit.

(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.

(c) Jupiter is the biggest planet- Right

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

(c) Which celestial bodies does a galaxy include ?

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.

(c) Find the north pole of 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.

(c) A window shutter opens and shuts continuously in the

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)

(c) There is repulsion between the like poles of a magnet, and

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.

(c) What are the practical uses of a magnet ?

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.

(c) When light passes through a prism, it gets separated into

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.

(c) What is a shadow ?

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.

6th Std Science 13 Sound l Question and Answer l

 YADNYA e-Learning

Science Studies -  6th Standard

13. Sound 

Question And Answer

1. Fill in the blanks with the proper words.

(a) The propagation of sound does not occur through a air

(b) Noise pollution is a social issue.

(c) The sound which is disagreeable to the ears is called Noise.

(d) Noise has adverse effects on our health. 

2. What should we do ?

(a) The silencer of a motorcycle is broken.

Ans: In absence of well-maintained silencer motorcycles will create noise and air pollution thus we should repair or replace silencer of motorcycle as soon as possible.

b) A factory in the surroundings is producing continuous loud noise.

Ans: 1) We should as the head of factory to control the noise in factory.

2) If proper action is not taken by factory authority then we should consult the noise in the factory.

3. Write the answers in your own words.

(a) What is meant by vibration ?

Ans: Vibration is periodic back and forth motion of the particles of an elastic body or medium occurs when any physical system is displaced from its equilibrium condition and allowed to respond to the forces that tend to restore equilibrium.

(b) Explain with the help of practical examples how sound is propagated through solids.

Ans: Sound is said to be propagate when sound waves spread in all directions from a source of sound. Ex. Stand at the end of big table and make a friend to stand on the other end. Ask the friend to knock lightly on the table you will hear a joint sound. Now you press your ear to the table and ask the friend to repeat the knock. You will hear a clear sound.

(c) What is meant by noise pollution?

Ans: The noise pollution is defined as the unwanted sound which is released into the environment. It’s disturb the human being and cause an adverse effect on the mental and psychological well-being.

(d) What measures will you take to control noise pollution ?

Ans: 1) We should avoid blowing the horn.

2) The volume of the TV or radio in the house should be restricted to those watching the programs.

3) Vehicle should be maintained properly to reduce the unnecessary sounds they produce.

4) Factories airports, railway stations and bus stands should be located at the proper distance away from residential areas.

4. Complete the table.

Thank You..

Visit Again For More Information..

6th Std Science 12 Simple Machines l Question and Answer l

YADNYA e-Learning

Science Studies -  6th Standard

12. Simple Machines

Question And Answer

1. Classify the following as a lever, a pulley and an inclined plane :

A wedge, a needle, a staircase, a slide, the wheel of a flagpole, nutcrackers, scissors, an opener, an axe, a crane, a knife.

2. Fill in the blanks using the proper word and complete the statements.

(a) The fulcrum in the centre, the load on one side and the effort on the other side make a lever of the first order. 

(b) The load in the centre, the fulcrum on one side and the effort on the other side make a lever of the second order. 

(c) The effort in the centre, the fulcrum on one side and the load on the other side make a lever of the third order.

3. Which machines will you use to do the following work ?

Write their types.

(a) To remove the lid of a tin.

Ans: Machine: Can opener

Type: Inclined plane

(b) To lift bricks to the top of a tall building.

Ans: Machine: Wheel and the rope

Type: Pulley

(c) To cut vegetables.

Ans: Machine: Knife

Type: Wedge

(d) To draw water from a well.

Ans: Machine: wheel and rope

Type: Pulley

(e) To hold a papad for roasting it.

Ans: Machine: Pair of tongs

Type: Lever

4. Write the answers to the following questions in your own words.

(a) What is meant by simple machines ?

Ans: The machines which have only one or two parts and a simple and easy structure such machines are called simple machines.

Ex. The nail cutter, the bottle opener 

(b) Mention the advantages of using a machine.

Ans: Advantages of using machine are as fallows:1) Machines are used for reducing efforts.

2) They save our time and do more work in less time. 

(c) What is meant by complex Machines ?

Ans: The machines which have many parts and carry out many processes for completing a task and their parts are joined to one another. Therefore, these machines are called complex machines. E.g sewing machine, mixer

(d) What is a lever ? How are the orders of the lever

determined ?

Ans: A lever is simple machine. It has three components i.e fulcrum, load and effort order of lever is determinant on the

basis of the efforts, the fulcrum and the load.

1) Lever of the first order: The fulcrum is in the centre, load at one end and effort at other end.

2) Lever of second order: The load is in the centre, the fulcrum on one side and effort on other side.

3) Lever of the third order: The effort is in the centre, the fulcrum on one side and the load on other side.

5. Why is this so ?

(a) Traveller’s bags have wheels.

Ans: Traveller’s bags have wheels just because of easy movement of bags from one place to another. It convenient and easy to lift bag from one end to other in upward direction. 

(b) Machines have to be maintained.

Ans: Parts of machine rub against one another when they are used. Soiled, dusty part create more friction some parts, affected by the weather, rust and erode. Machines get damage or become useless due to such wear and tear. To avoid this, it is necessary to maintain and take care of machines.

(c) A bicyle is said to be a complex machine.

Ans: A bicycle is a complex machine because its parts are joined to one another. The structure is complicate. Hence a bicycle is said to be a complex machine. 

6. Name the levers mentioned in the following passage. Identify the fulcrum, load and effort of each and say which type of lever it is.

Ravi and Savita sit on a sea-saw in a garden. In the mean time, a gardener is trimming trees in the garden. He puts the leaves and other garbage in the wheelbarrow. Later, Ravi gets thirsty and he buys lemon sherbet. The sherbet seller cuts the lemon and squeezes it using a lemon squeezer. He puts small pieces of ice in the glass with the help of the tongs. 

Ans:

Thank You..

Visit Again For More Information..

6th Std Science 11 Work and Energy l Question and Answer l

YADNYA e-Learning

Science Studies -  6th Standard

11. Work and Energy

Question And Answer

1. Fill in each blank with the appropriate term from the brackets.

(a) A bucketful of water is to be drawn from a well. Work will be done when a force is applied to do this, because there will be a displacement of water.

(displacement, work, force)

(b) If a ball is dropped on the sloping roof of a house, it acquires motion and falls on the ground. That is, transformation of potential energy into kinetic energy takes place.

(kinetic, potential, motion)

(c) You might have seen some beautiful fireworks during Diwali. It is an example of transformation of chemical energy into light energy.

(light, atom, chemical, solar) 

(d) The solar cooker is an application of the heat energy of the sun, while solar cells, solar lamps are applications of the light energy of the sun.

(light, chemical, heat)

(e) One labourer carried four pans of road metal through a distance of 100 metres. If he carries two pans of road metal through a 200 metre distance. equal work will be done.

(equal,more, less) 

(f) The capacity that an object has for doing work is called energy.

(energy, displacement, force)

2. Match the pairs.

3. Can you tell ?

(a) When can we say that displacement has taken place ?

Ans: We can say that displacement has done when the position of the object change.

(b) What should be taken into account for measuring work ?

Ans: Force and displacement

(c) What are the various forms of energy ?

Ans: 1) Mechanical energy 2) Heat energy 3) Light energy 4) Sound energy 5) Chemical energy 6) Electrical energy

(d) Describe one natural chain of transformation of energy.

Ans: 1) Water cycle evaporate due to heat of the sun. This water vapour forms clouds that gives rain.

2) Rainwater flows into rivers and a store in reservoirs on dams.

3) This hour at a height and therefore their water has potential energy which transfer made into kinetic energy as the water falling downward.

4) When the water falls on the turbine, its kinetic energy is transferred to the turbine.

5) The turbine producing electrical energy. Electrical energy is used in our house for various purpose. 

(e) Why should we save energy ?

Ans: 1) Saving energy is as good as generating energy.

2) Due to the increasing population and increasing use of energy resources, there is a danger that the limited resources of coal, petrol, diesel, crude oil and natural gas will be exhausted.

3) Also due to overuse of energy, lots of polluting gases are released in the atmosphere this leads to pollution and global warming. Thus in order to preserve natural resources and conserve environment, we must save energy. 

(f) What is ‘green energy’ ?

Ans: The energy resources which do not produce smoke and carbon gases such as carbon dioxide or carbon monoxide is

called green energy.

(g) What are the non-conventional energy resources ?

Ans: Non-conventional energy resources are inexhaustible and continuous and can be used in various forms again and again. Ex. 1) solar energy 2) wind energy 3) tidal energy 4) hydroelectric or hydro power 5) atomic energy 

(h) Which forms of energy from the sun are used in solar energy devices ?

Ans: Heat energy, Light energy, Chemical energy

(i) Why should we maximise the use of non-conventional

energy resources ?

Ans: Due to increasing population and increasing use of energy resources were there is a danger that the limited resources of coal, petrol, diesel, crude oil and natural gas will get exhausted. Therefore we should maximize the use of non-conventional energy resources.

4. Who is the odd-one-out ?

(1) Diesel, crude oil, natural gas, wind

Ans: Wind

(2) A running car, hauling a log, a book kept on a table, picking up the school bag.

Ans: A book kept on a table

(3) Sunlight, wind, waves, petrol

Ans: Petrol

(4) Leaving the fan on in a vacant room, leaving the TV on while working, using AC during winter, putting off the light when

going out.

Ans: Putting off the light when going out 

5. Find out the types of energy from the following puzzle.

Ans:

Thank You..

Visit Again For More Information..