Light, Shadows And Reflections : NCERT Class VI Science Lesson 11
NCERT Class VI Science textbook:
Lesson 11: Light, Shadows And Reflections.
Exercise
1.Question.
Answer.
2. Question. Classify the objects or materials given below a opaque, transparent or translucent and luminous or non_ luminous:
Air,water, A piece of rock, A sheet of aluminum, A mirror, A wooden board, A sheet of polythene, a CD, Smoke, A sheet of plane glass, fog,A piece of red hot iron, An Umbrella, A lighted fluorescent tube, A wall, A sheet of carbon paper, A flame of a gas burner, A sheet of cardboard, A lighted torch, A sheet of cellophane, A wire mesh, Kerosene stove, sun Firefly, Moon.
Answer.
Luminous Non- luminous.
A piece of red hot iron Air.
A lighted fluorescent tube. Rock
flame of a gass burner. Aluminum.
lighted torch. Wooden board.
Kerosene stove CD.
sun Firefly Wire mesh.
Mirror.
Polythene.
Moon.
Fog.
Smoke.
Cardboard.
Cello- phane.
wall.
Plane glass.
Water.
Cardboard
3. Question. Can you think of creating a shape that would given a circular Shadow if held in one way and a rectangular shadow
if held in another way?Answer. Yes.
4. Question. In a completely dark room, if you hold up a mirror in front of you, will you see reflection of yourself in the mirror?Answer. In a completely dark room, on cannot see any image in the mirror, because there is no light falling on mirror Which can be reflected to show the image.
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Electricity and Circuits : NCERT Class VI Science Lesson 12
NCERT Class VI Science textbook:
Lesson 12: Electricity and Circuits.
Exercise
1.Question.Fill in the blanks:
Answer. (a) A device that is used to break and electrics circuit is called *switch.*
(b) An electric cell has *two* terminals.
2.Question.Mark 'True' or 'False' for the following statements.
Answer.(a) Electric Circuit can flow through metals. (True)
(b) Instead of metal wires,a jute sting can be use to make a circuit. (False)
(c) Electric current can pass through a sheet of thermacol. (False)
3. Question. Explain why the bulb would not glow in the arrangement show in fig.
Answer. The bulb will not glow because the circuit is disconnected due to presence of an insulator in between.
4.Question. Complete the drawing show in fig. to indicate where the free ends of the two wires should be joined to make the bulb glow.
Answer.
5.Question. what is he purpose of using an electric switches? Name some electric gadgets that have switches built into them.
Answer. switch is a simple device tht is used to either break the electric circuit or to complete it.
Electric gadgets that have switches built into them are microwaves, freezes,rice cooker, automatic, electric irons,toastr, patty makers.
6.Question. Would the bulb glow after completing the circuit shown in fig. in Q4 if instead of safety pin we use an eraser?
Answer. 'No'.
7. Question. Would the bulb gloe in the circuit. show in fig.
Answer.No.
8. Question.Using the ''conduction tester'' an object it was found that the bulb begins to glow. Is that object a conductor or an insulator? Explain.
Answer.That object is a conductor because electricity can pass through only a conductor and not through an insulator. Unless the object is conductor, the bulb could not glow.
9.Question. Why should an electrician use rubber gloves while rearing an electric switch at your home?
Answer. The rubber gloves are insulators. This saves electrician from getting shock. That is why an electrician uses gloves, while rearing an electric switch.
10.Question. The handles of tools like screwdrivers and pliers used by electrician for repair work usually have plastic or rubber covers on them. Can you explain why?
Answer.Plastic and rubber, both are bad conductor of electricity. Hence, they protect against electric shock.
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Fun with Magnets.: CBSE NCERT Class VI Science Lesson 13:
NCERT Class VI Science Textbook:
Lesson 13: Fun with Magnets.
Exercise
1.Question. Fill in the blanks in the following.
Answer.(a) Artificial magnets are made in different shapes such as (Bar magnet, horse, shoe and cylindrical).
(b) The materials which are attracted towards a magnet are called (magnetic).
(c) Paper is not a (magnetic) material.
(d) In olden days, sailors used to find direction suspending a piece of (magnet).
(e) A magnet always has (two) poles.
2.Question. State whether the following statements are True or False.
(1) A cylindrical magnet has only one pole. (False)
(2) Artificial magnets were discovered in Greece. (False)
(3) Similar poles of magnet repel each other. (True)
(4) Maximum iron filings stick in the middle of a bar magnet when it is brought near them. (False)
(5) Bar magnet always point towards North_South direction. (False)
(6) A compass can be used to find East_west direction at any place.(True)
(7) Rubber is a magnetic material.(False)
3.Question. It was observed that a pencil sharpener gets attracted by both the poles of a magnet although its body is made of plastic. Name a material that might have been used to make some part of it.Answer. Iron.
4.Question. Writ any two properties of a magnet.
Answer.(a) Attracts objects made of iron, nickle or cobalt.
(b) Direct North_South direction.
5.Question. Where are poles of a bar magnet located?
Answer.On two ends of the bar magnet.
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Water : Class VI Science Lesson 14:
NCERT Class VI Science textbook:
Lesson 14: Water.
Exercise
1.Question. Fill up the blanks.
Answer. (a) The process of changing of water into its vapour is called evaporation.
(b) The process of changing water vapour into water is called condensation.
(c) No rainfall for a year or more may lead to drought in that region.
(d) Excessive rains may cause flood.
2.Question. State for each of the following weather it is due to evaporation or condensation.
(a) Water drops appear on the outer surface of a glass containing cold water.(condensation) (b) Steam rising from wet clothes while they are ironed.(evaporation)
(c) Fog appearing cold winter morning.(condensation)
(d) Blackboard dries up after wiping it.(evaporation)
(e) Steam rising from a hot girdle when water is sprinkled on it. (evaporation)
3.Question.Which of the following state mentioned are "True"?
Answer.(a) Water vapour is present in air only during the monsoon. (False)
(b) Water evaporates into air from oceans,rivers and lakes but not from the soil. (False)
(c) The process of water changing into its vapour, is called evaporation. (True)
(d) The evaporation of water takes place only in sunlight. (False)
(e) Water vapour condenses to from tiny droplets of water in the upper layer of air where it is cooler. (True)
4.Question.Suppose you want to dry your school uniform quickly. Would spreading it near an anghiti or heather help? if Yes, how?
Answer. spreading it near an anghiti will help, because due to more heat around, evaporation will be faster.
5.Question. Take out a cooled bottle of water from refrigerator and keep it on a table. After some time you notice a puddle of water around it.Why?
Answer. The cool surface of cooled bottle cools the air around it, and the water vapour of the air condenses on the surface of the bottle.
6.Question. To clean their spectacles,people often breath out on glasses to make them wet. Explain while the glasses become wet ?
Answer. The most air coming out from mouth condenses on glasses to make glasses wet.
7.Question.How are clouds formed?
Answer.The process of condensation plays an important role information of cloud. As water vapour goes higher from the surface of the earth, it gets cooler. When the air moves up it gets cooler and cooler. At sufficient hights the air becomes so cool That the vapour present in it condenses to from drops of water called droplets. It is these tiny droplets that remain floating in air and appear to us as cloud.
8.Question. When does a drought occur?
Answer. It does not rain for on two or year, The soil continues to lose water by evaporation and transpiration.Since it is not being brought back by rain, The soil becomes dry. The level of water in ponds and wells of the region goes down and some of them may even dry up. The ground water may also become scarce. This may lead to drought.
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Air Around us : Class VI Science Lesson 15
NCERT Class VI Science textbook: Lesson 15: Air Around us.
Exercise
1.Question. What is the composition of air?
Answer. Air contains some gases in air are mainly nitrogen,oxygen, small amounts of carbon dioxide, and many other gases.Air contains mostly nitrogen and oxygen. These two gases together make up 99% of the air. The remaining 1% is constituted by carbon dioxide and a few other gases, water vapour and dust particles.
2.Question. which gas in the atmosphere is essential for respiration ?
Answer. Oxygen.
3.Question. How will you prove that air support burning?
Answer. Two lighted candles are taken. one candle is covered a fixed in a tumbler containing water. This candle is covered by an inverted glass. After sometime, the covered candle gets extinguished and water rises upto 1/5th is oxygen. The candle extinguished as soon as all the oxygen was used up.
4.Question. How will you so that air is dissolved in water?
Answer.When a tumbler containing water heated, tiny bubles appear on the inner side. These bubles appear before the water starts boiling. So, these must be air bubles. This shows that water contains air.
5.Question. Why does a lump of cotton wool shrink in water?
Answer.a lump of cotton wool shrink in waterbecause the air inside wool cotton is driven out by water. They layer stic together and hence the lump shrinks.
6.Question. The layer of air around the earth is known as:-
Answer.atmosphere.
7.Question. The comppnent of used by green plants to make their food, is :
Answer. Carbon doxide.
8.question. List five activities that are possible due to the presenmce of air.
Answer. (1) Winnowing.
(2) Formation of clouds.
(3) Respiration.
(4) Photosynthesis.
(5) Transpiration.
(6) Flying of birds.
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Garbage In, Garbage out : NCERT Class VI Science Textbook : Lesson 16
Exercise
1. Question. (a) Which kind of garbage is not converted into compost by the red worms?
(b) Have you seen any other organism besides red worms, in you pit? if yes, try to find out their names. Draw picture of these.
Answer. (a) plastic bags, tins, bottles, glass, aluminum foils, broken bangles.
(b) Sometimes we do see small insects, bugs, beetles, spiders. Then there are microorganisms too.
2. Question. Discuss:
(a) Is garbage disposal the responsibility only of the government?
(b) Is it possible to reduce the problems relating to disposal of garbage?
Answer. (a) No, it is our responsibility also. We should use and reduce on grabage. We should use ans reuse
the thing before throw it.
(b) Yes, it is possible to reduce the problem relating to disposal of garbage by using re-cycle able materials.
3. Question. (a) what do you do with the left over food at home?
(b) If you and your friend are given the choice of eating in a plastic plate or a banana leaf platter at a party, which one would you prefer and why?
Answer. (a)
(i)Pre serve properly and reuse.
(ii) Convert it to some other food preparation and consume.
(b) Banana leaf platter, because.
(i) easy disposal,
(ii) easy be recycled,
(iii) more environment-friendly.
4.Question.
(a) Collect pieces of different kinds of paper. find out which of these can be recycled.
(b) With the help of a lens look at the piece of paper you collected for the above question, see any difference in the material of recycled paper and new sheet of paper?
Answer. (a) Except plastic paper, all other papers can be recycled.
(b) Recycled paper is more thick and more rough as compared to new sheet paper.
5.Question. (a) Collect different kinds of packaging material. What was the purpose for with each one was used? discuss in groups.
(b) Give an example in which packaging could have been reduced.
Answer. (a)
(i) Paper packet __ light food items.
(ii) Card board ___ crockery.
(iii) Plastic covers __ cloths,dresses.
(iv) Glass covers __ shoe piece.
(vi) Wooden boxes ___ delicate items.
(b) Cloths,dresses.
6. Question. Do you think it is better to use compost instead of chemical fertilisers? Why?
Answer. (i) Yes, it is better to use compost instead of chemical fertilisers.
(ii) By using compost, we are reusing our garbage.
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Lesson 8 : A Game of Chance | Class VI (6th) English Textbook - Honeysuckle
Exercise
1.Question. Why do you think Rasheed's uncle asked him not to buy anything in his absence?
Answer. The uncle new how to the clever shopkeeper could cheat a littl innocent boy. So he warned Rasheed neither to buy anything in his absence, nor go from that place.
2.Question. Why was the shop called 'Lucky Shop'?
Answer. The shop was called Lucky shop because it gave a chance to try one's luck.One had to select six discs and total the numbers written on it. He paid 50 paise and won the thing marked with that total number.
3.Question. An old man won a clock and sold it back to the shopkeeper. How much money did he make?
Anwser. The old man added up the numbers or six discs. He got a beautiful clock marked 15 the shopkeeper bought back the clock. The old man made Rs.15 and went away very pleased.
4.Question. How many prizes did the boy win? What were they?
Answer. The boy won for prizes in all. these were a comb, a fountain pen, a wrist watch and a table lamp.
5.Question.Why was Rasheed upset?
Answer. Rasheed was upset because he bad lost all his money and got nothing.He called it his bad nothing.
He called it is bad luck.His uncle explained to him that he had been be fooled and cheated by the shopkeeper.
6.Question. In what way did the shopkeeper make a fool of Rasheed?
Answer. The shopkeeper played tricks to tempt Rasheed to try his luck. Every time Radheed played the game, he got only some cheap thing which was bought back by the shopkeeper. In this way Rasheed lost all his money.
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