CHAPTER All Qoestion

8/3/2019 CHAPTER All Qoestion

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CHAPTER-1CROP PRODUCTION AND MANAGEMENT1. Define crop.2. List the conditions necessary to provide food for a

largepopulation.3. How are crops categorized based on the seasons.4. Paddy cannot be grown in winter season. Givereason.5. What are Agricultural practices?6. What will happen if tilling is not done?7. What is the advantage of using a cultivator?

8. What will happen if the farmers do not replenishthe soil?9. What is the advantage of using seed drill overtraditional tools?10. What are nursery fields?11. What are the advantages of using manure?12. Why does irrigation is more important for plants?13. Why weeding is necessary?

14. What preventive measures should be taken whilesprayingpesticide?15. Name some festivals of India associated withharvestseason.16. What is Animal Husbandry?17. What will happen when harvested grains are

stored withoutdrying?18. A farmer uses dried neem leaves to store hisgrains in ametallic container. Give reason.19. What are combines?


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20. What is fallowing?HOTS:21. Leguminous plants do not require nitrogenousfertilizers.

Give reason.22. A farmer wanted to sow gram seeds in his field.Hecollected seeds and put it in a container with water,someseeds sank down and some seeds were floating.Which seeds hewill be selecting and why?

23. A farmer was growing only paddy in a particularfield for 5successive seasons. He found that the yielddecreases everytime. Give reasons and how can his problem besolved?24. A group of students conducted activity wherethey have

taken three glasses A, B and C with same amount ofsoil andplanted same sized seedlings. They added cow dungmanure inglass A, little urea in glass Band nothing in glassC.After oneweek they found the seedlings in glass B has shownmore growth

than A and C. Give reason for your observation.25. Which irrigation method can be used to conservewater andWhy?MULTIPLE TYPE QUESTIONS


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26. Bacteria which fix up nitrogen in leguminousplants isa. Lactobacillusb. Rhizobium

c. Azatobacterd. Nitrosomonas27. Cod liver oil which we get from fish is rich ina. Vitamin Ab. Vitamin Cc. Vitamin Dd. VitaminB28. The tool used for leveling the field for sowing and

irrigationpurpose isa. Ploughb. Hoec. Levelerd. Cultivator29. Kharif crops are grown froma. October to march

b. June to Septemberc. January to April30. The process where the nutrients held in deadorganisms arereleased back bya. Fermentationb. Decomposition.c. Digestion

Chapter 2 MICROORGANISMS: FRIEND AND FOE1. Why microorganisms are called so?2. What are the major groups of microorganisms?3. Name a microbe which can be seen with amagnifying glass.4. How do virus different from other microorganisms?


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5. Name some disease caused by virus.6. Where do microorganisms live?7. Name the bacterium which promotes theformation of curd.

8. What is Biotechnology?9. What are antibiotics?10. How do antibodies protect our body?11. What is pasteurization? What is the purpose ofdoing it?12. Why are blue-green algae used as fertilizers?13. What do yeast produce during fermentationprocess?

14. Why antibiotics have no effect on viruses?15. Name two nitrogen fixing algae.16. What will happen if yeast is not added to themaida flourfor making bread?17. Name some food substances contain naturalsugars.18. What are the two groups of organisms of fungi?

19. What are carriers of disease?20. What will happen if water gets collectedanywhere in theneighborhood?HOTS:21. Why are children/infants given vaccination?22. What will happen if spoilt food is consumed?23. During pasteurization the boiled milk is suddenly

chilled andstored. Why?24. How does the concentration of nitrogen remainsconstantalways in the atmosphere?


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25. What will happen if there is no decomposition ofwaste?26. We encounter with the microorganisms everydaythrough

the food we eat, water we drink and the air webreathe, but wedont get disease always. Give reasons.27. The process of conversion of sugar into alcohol isknown asa. Fermentationb. Respirationc. Pasteurization

28. Anthrax is a dangerous human and cattle diseasecaused bya. Bacteriumb. Virusc. Algaed. Protozoa29. Foot and mouth disease of cattle is caused bya. Algae

b. Protozoac. Virus30. The carrier of malaria causing protozoan isa. Female Anopheles mosquitob. Cockroachc. Houseflyd. Butterfly31. The bread or idli dough rises because of

a. Heatb. Grindingc. Kneadingd. Growth of yeast cells32. Identify the microorganisms and mention theirrole in our


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daily life.33. Describe some important landmarks in the studyofmicroorganisms.

34. Give some of the common plant disease causedby microorganismsand their mode of transmission.35. Explain the different methods of foodpreservation.36. What are the modes of transmission of diseasebymicroorganisms?

37. How does respiration different fromfermentation?CHAPTER-3SYNTHETIC FIBRES AND PLASTICS1. What are polymers? Give an example of naturalpolymer.2. Give examples of synthetic fibres.3. Mention the characteristics of polyester.

4. Name a fibre which is silk like but man made.5. Which fibre is made from coal, air and water?6. What is PET?7. Give some characteristics of plastics.8. Give two reasons for using synthetic fibres thannatural fibres.9. What is PVC? What are its uses?10. What is blended fabric? Why it is more

comfortable towear blended than fabrics from pure synthetic fibres?11. What are Biodegradable and Non biodegradablesubstances?12. Give some advantages of plastic material likepolythene over


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natural materials.13. What are Petrochemicals?14. Name the components of Polycot, Polywool andterry cot.

15. How does plastic is useful in the field ofmedicine?16. What are fire-proof plastics?17. What will happen when polythene bags arethrown here andthere?18. How can we become fibre-wise?19. What is 4R principle?

20. Why is it not advisable to wear polyester clotheswhileworking in the kitchen?(HOTS)21. What will happen when thermoplastics are usedfor makingelectrical switches?(HOTS)22. What nature of plastics is used for making themas good

storage containers of chemicals?(HOTS)23. What is acrylic? What are its advantages?24. The recyclable material isa. Carry bagsb. Electrical switchesc. Cooker handles25. Melamine is a type ofa. Polythene

b. Thermoplasticsc. Thermosetting26. The property of plastic which leads to plastic ofany shapea. Recyclableb. Reusable


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c. Moldable27. The synthetic fibre used for making parachutesand ropesfor climbing

A) RayonB) Nylonc) Acrylic28. What property of Bakelite is used for makingthem electricalswitches andhandles of various utensils? (HOTS)29. What are the disadvantages of using plastics?

30. How can we reduce the pollution caused byplastics?ANSWER THE FOLLOWING QUESTIONS :1) Which is the most abundant metal and non-metalin theearths crust?2) You are provided witha) Aluminium wire

b) Iron nailc) Pencil lead3) Aluminium foils are used to wrap food items. Givereasons.4) All metals are hard in nature. Do you agree to thisstatement?5) Classify the following as metals and non-metalsgold, carbon, sodium, sulphur, oxygen, iron

6) Metals are hard to cut except two metals. Namethem.7) Except one all metals are solid. Name the metalandits state of existence?8) What do you mean by ductility? Which substances


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show this property?9) The ringing of bells in temples are made of metal.Why?10) If you put one end of the rod of a metal in hot

water,you feel at the other end. What does it mean?11) Which of the following metals is the bestconductor?of heat and electricity?12) Aluminium metal is widely used for makinghouseholdutensils and electric wires. What do you infer?

13) Your mother feels more comfortable to use avesselwith plastic handle or wooden handle for cooking.why?batteryFe piece Sulphur14) Answer the following questions:i. Bulb glows in both the circuits.

Can we say iron nail is a good conductor ofelectricity?15) It is better to store lemon pickle in a glasscontainer instead of Al utensil. Explain.16) The cut face of sodium has a metallic lusture. Butafter sometime the metallic lusture disappears.17) What happens when a strip of Mg ribbon burns inair? Write the chemical equation involved in it ?

18) Sodiumis dropped into a beaker containing water. You areasked to moveaway from the beaker. At times a small flame is alsoproduced.Discuss.


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19) Take a copper nail or plate and place it in abeakercontaining iron sulphate. After 10 min take out thestrip of copper and examine it carefully. Record

your observations. Give reasons.

20) Explain whyi) sodium does not occur in the free stateii) Gold is found in the free stateiii) Copper is used for electrical wiring.21) Why do some metals replace the other metalsfrom their

solutions?22) Silver does not combine easily with oxygen b butsilver jewellerytarnishes after some time. Why?23) Compare the properties of metals and non-metals with respect tomalleability, ductility and conductivity.24) Explain

i) Mgo is basic in nature andii) So2 is acidic in nature.25) A substance was burnt in air. The white residueobtained wasadded to water. This water solution turned red litmusblue. Statewhether the substance is a metal or a non-metal?(HOTS)

26)CuSo4What do you observe?27) Name a metal that replaces silver from AgNo3solution. Give itsequation and reason also.


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28) Why is tincture iodine applied on wounds?29) Aluminum vessels loose its shine very soon afteruse. Why?30) What happens when

Zn + Hcl.Cu + Hcl.Cu + H2So4FeSo4 + Zn31) Give reasons for the followingi) Iron sheets are galvanized before use.ii) Graphite is used as an electrode in the dry cell.iii) Silver is used in making mirrors.

iv) Aluminium is used to make electrical wires.v) Iron is used in constructing bridges and houses.32) Charcoal on burning gives out the gas. Theevolved gas iscollected in a test tube.i) How will you find the nature of the gas?ii) Write down word equations of all the reactionstaking place in

the process.(HOTS).Question and answers1. Define natural resources.2. Can we use all our natural resources forever?3. What is meant by i) Exhaustible and ii)Inexhaustible naturalresources.4. Explain the fossil fuel.

5. How coal is formed?6. What is meant by carbonization?7. Can you differentiate between coke and coal?8. What do you mean by destructive distillation?9. Name the petroleum product used for laying roadsinstead of coal


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tar?10. Expand LPG.11. List the uses of LPG.12. You are in need of good fuel. What are the

characteristics ofgood fuel?13. Name the different constituents of petroleum.14. We prefer to use LPG and CNG as fuels. Why?(HOTS)15. Fossils fuels are exhaustible natural resources.Do you agree?(HOTS)

16. Explain the process of formation of petroleum.17. List the characteristics and the uses of coke.18. Coke is mainly used in the extraction of manymetals. Can youguess why it is used? (HOTS)19. What are hydrocarbons? Give one example.20. You are provided with large quantities of deadorganism. Can you

prepare cola or petroleum or Natural gas in thelaboratory?21. Define the term petroleum refining.22. How would you demonstrate the process ofdestructivedistillation of coal in the laboratory?23. Discuss the process of formation of petroleum.24. Our country is facing fuel crisis. It is essential

to save everydrop of petrol. As a student what are the differenttips that youcan suggest for the saving of petrol and diesel.(HOTS)


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25. Name the different places in India where naturalgas has beenformed.26. List the uses of petroleum products.

COMBUSTION AND FLAMEQUESTIONS (OPEN ENDED):-1) What is the difference between the burning of acandle and theburning of a fuel like coal?2) A matchstick does not catch fire on its own atroomtemperature. Why?

3) Ram has made two paper cups by folding a sheetof paper. Hepoured 50 ml of water in one of the cups and heatedboth thecups separately with a candle.a) What happens to the empty paper cup when it isheated?b) What happens to the paper cup with water?

c) Does water in this cup becomes hot?4) Can you list out the names of some inflammablesubstances?5) Does your city/town have a fire brigade station?Find out thetelephone number of the fire service in your area.6) When a fire brigade arrives at the accident spotwhat does he

do?7) carbon-di-oxide is the best fire extinguisher. Givereason.8) In what form is LPG stored in cylinder?9) Water is not used to control fires involvingelectrical equipment.


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Give reason.10) Why LPG a better domestic fuel than wood?11) What is the unit in which the calorific value of afuel is

expressed?12) Ravi and Sita were doing an experiment in whichwater was tobe heated in a beaker .Ravi kept the beaker near thewick in theyellow part of the candle. Sita kept the beaker in theoutermostpart of the flame. Whose water will get heated in a

shorter time?13) It is difficult to burn a heap of green leaves butdry leavescatch easily. Why?14) Can the process of rusting be called combustion?15) What are the criteria you would consider whentrying tocategorise something as a good fuel?

16) It is dangerous to burn coal in a closed room.Why?17) There is global warning on global warming.Which gasconcentration leads to this problem?CHAPTER-7CONSERVATION OF PLANTS AND ANIMALS1. What are national parks?

2. What are wildlife sanctuaries?3. What are Biosphere Reserves?4. What is the purpose of making National parks,Sanctuaries andBiosphere Reserves?


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5. How does deforestation reduce rainfall on the onehand andleads to floods on the other?(HOTS)6. What is desertification?

7. What is flora and fauna?8. What are Endemic species?9. What is project Tiger?10. What is the difference between zoo and a wildlifesanctuary?11. What are endangered animals?12. What is an ecosystem?13. What are the purposes for which the trees are cut

in theforest?14. List down the consequences of deforestation.15. What will happen when rainfall decreases?16. Animal life is also affected by deforestation. How?(HOTS)17. Define Species.18. Mention some flora and fauna of Pachmarhi

BiosphereReserve.19. Why is Reforestation important?20. What do you understand by the term migration?21. Why should we conserve Biodiversity?(HOTS)22. What is Red Data Book?23. What will happen if the top layer of soil isexposed?(HOTS)

24. Kaziranga National Park is an reserved area for1. Rhinoceros2. Lion3. Tiger4. Elephant


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25. Biosphere Reserves are areas meant forconservation of1. Forest2. Water

3. Biodiversity4. Soil26 Species of plants and animals which are foundexclusively ina particularAreaExtinct animalEndemic animal

Endangered animal27. The places where killing and capturing of animalsis strictlyprohibitedSanctuariesForestsBiosphere ReservesNational Parks

28. The plants and animals found in a particular areaareSpeciesWild animalsFlora and Fauna29. Sometimes animals enter into human habitationkilling peopleand causing

Damage to materials. Why do the animals behavelike this?(HOTS)30. Why animals become extinct? (HOTS)CHAPTER-8CELL STRUCTURE AND FUNCTIONS


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MULTIPLE CHOICE QUESTIONS

1) Structural and functional unit of life .a) cell b)plant c) animal d) man

2)The term cell was coined bya) Robert hook b) leeuvan hock c) Fleming d)Alexander

3) Human body has . Number of cellsa) trillion b) billion c) million d) thousands

4)The starting point in making of a muliticellularorganisms is.a) sperm b) ovum c) fertilized egg d) hen

5) the process which increases the number of cells inlivingorganisms is ..a) cell division b) photosynthesis c) excretion d)digestion

6)The shape of amoeba is .a) spherical b) oval c) ever changing d) circular

7) Bricks make the buildings, make theorganismsa) stones b) cement c) cells d) muscles

8) Robert hook called the partitioned empty boxes inthe cork As.a) wood b) bark c) cell d) organ

9) Study of detailed structure of cell was possible

after theinvention of a) cell b) microscope c) light d) energy

10)The smallest living cell is ..a) yeast b) bacteria c) amoeba d) paramecium


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11)The plant cells are green in colour because of.a) plastids b) melanin c) keratin d) haemoglobin

12)The chemical molecule which determines thecharacters oforganisms is .a) NaCl b) CO c) DNA d) HCl

13) A cell with a definite nucleus and membraneboundorganelles is called as .a) prokaryotic b) virus c) eukaryotic d) plant cell

14)The life giving substance present in the cell is..a) protoplasm b) cell wall c) cilia d) proteinOPEN ENDED QUESTIONS1) Do plant cell need a cell wall? Justify your answer2) If nucleus is not there, what would happen to thecell?3) Name one prominent character whichdistinguishes living

things and non-living things?4) Scientists are engaged in making a living cell-discuss theresult?5) Brick and cell are one and the same interpret thesentence?6) Rat and elephant are having same number of cellsinterpret

the sentence?7) Amoeba can attain the shape of paramaecium .Canparamaecium attain the shape of amoeba explain?8) What would happen if amoeba does not change itsshape?


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9) You are given a permanent slide of a cell. Bylooking throughthe microscope how do you identify it as a plant cellor a

animal cell10) Do plant cell need a very large vacuole? JustifyyourAnswer11) What would happen if the size of each humancell issimilar to the size of ostrichs egg?12) Do plant cells need a cell wall? Justify your

answerHOTS1) A coloured substance is added to onion peel whilepreparinga temporary mount, why?2) A single cell can perform all the functions of life,why dowe need many cells?

3) Write two points of differences between tissue andorgan?4) What advantage does WBC in humans derive bychangingtheir shapes?5) Circle the salient features of plant cell6) Can a leaf of a plant be of different colour and canthey do

photosynthesis?7) Define inheritance. What is actually passed onfromparents to young ones?8) Cell is considered as structural and functional unitof life.


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Justify the statement9) How are new cells formed on the earth?10) In what way the number of cells related to thesize of

the organisms?11) WBCs in humans are called as amoebocyteswhy?12) Shape of cells related to their function. Explainwithan example?13) Temporary mount of onion peel reveals threeprominent structures name them.

14)(A) (b)identify the living cell .state the features15) Identify which one is amoeba and how?Chapter- 9REPRODUCTIONMultiple choice questions1) The life process essential for continuation of life on

earthis a) digestion b) reproduction c) respiration d)excretion2) Male part of flower is called as .a) pistil b) stamen c) calyx d) corolla3) The female part of the flower is called as ..a) pistil b) stamen c) calyx d) corolla

4) The male gamete in plants is called as a) pollen b) ovule c) stamen d) ovary5) The female gamete in plants is called as a) pollen b) ovule c) stamen d) ovary6) Fertilised egg in animal is called as ..a) Zygote b) egg c) sperm d) ovum


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7) The process of fusion of male gamete with thefemalegamete is called as .a) nucleus b) Zygote c) fertilisation d) hybridization

8) The other name of oviduct is .a) Fallopian tube b) egg tube c) Bladder d) ovary9) The muscular bag where the Zygote develops iscalled asa) uterus b) testis c) ovary d) sperm10) Egg shell of a hen can be compared to the of

frogs egga) jelly b) yolk c) nucleus d) ovum11) In hen the development of the embryo takesplaceIn.a) body b) uterus c) ovary d) egg12) The first animal born by cloning was .a) Male b) dolly c) horse d) man

14) The gamete which is capable of movement isCalled.a) sperm b) ovum c) nerve cell d) bloodOPEN ENDED QUESTIONS1) What will happen if there is no reproduction onearth?2) Zygote is the beginning of a new individual. Justifyyour answer

3) Can a baby grow in a test tube? Explain4) Human baby resembles man, but the tadpole doesnot resemble.Give reasons?5) What will happen if a man can reproduce bybudding?


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6) Do we need to clone humans? Discuss the prosand cons7) Can an organism live successfully withoutproducing its own kind?

8) Is it necessary for the sperm to move?9) Tadpole is a young one of a frog. Justify youranswer10) Human male gamete has a tail but femalegamete does notwhy?11) Which is advantageous, internal fertilization orexternal

fertilization. Justify your answer12) Women born without a uterus, can she give birthto a baby?Explain13) Which is the important part of a sperm? Why?HOTS1) Why human egg is small but that of hens is large?2) The young one resembles both the parent. Justify

yourstatement?3) Why fishes and frogs produce enormous numberof gametes?4) Explain the term OVOVIVIPAROUS, with anexample?5) Do we always require two individual forreproduction?

6) Can we make exact copies of us? How?7) Is it necessary for sperm to move?8) In which part of human female reproductivesystem,fertilization takes place?


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9) How could a single cell become a young one withtrillion cells?10) Do we also undergo metamorphosis ? explain11) Discuss the advantages of asexual reproduction?

12) Discuss the advantages of sexual reproduction?13) Why testes in mammals are kept outside thebody?14) State the advantage of cloning?15) How many sperms can enter into the humanegg?16) Why is it essential for the sperm to fuse with theegg?

17) Give two examples of Zygote and foetus18) Human sperm or ovum is a single cell. Justifyyour answer?19) State one main difference between human cheekcell andspermCHAPTER-10Reaching the age of adolescence

MULTIPLE CHOICE QUESTIONS1) The period of life when the body undergoeschanges leading toreproduction maturity is called.a) Childhood b) adolescence c) adulthood d) growing2) Onset of puberty in human female is markedby.a) Menstruation b) menopause c)chromosome d) sex

determination3) On set of production of sperm in man is calledas.a) Puberty b) menarche c) menopause d) estrogen4) The most conspicuous change during puberty is..


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a) Height b) colour c) shape d) weight5) The ductless gland which secret hormones arecalled as .Glands

a) Endocrine b) exocrine c) tubular d) branched6) The secretion of endocrine glands arecalled.a) Hormones b) enzymes c) proteins d) fats7) Hormones reach the target organsthrough.a) Water b) acid c) blood d) salt8) The gland which does both exocrine and endocrine

functionsis a) Pituitary b) liver c) pancreas d) adrenal9) The protruding larynx in man is referredas.a) Adams apple b) goiter c) syrinx d) neck10) The stoppage of menstruation in human femaleis called

asa) Menarche b) menopause c) puberty d) death11) The stage of human life in which thinkingcapacity of brain ismaximum at..a) Childhood b) adult hood c) adolescence d) old age12) The drastic changes in the human body duringadolescence

are controlled by.a) Hormones b) fats c) enzymes d) proteins13) The sex hormone responsible for maleness inhumans isa) Estrogen b) adrenaline c) progesterone d)testrosterone


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14) The sex hormone responsible for femaleness inhumansisa)Estrogen b) adrenaline c) progesterone d)

testrosterone15) The master endocrine gland is ..a) Pituitary b) thyroid c) pancreases d) testis16) The total number of chromosomes in a humancell is..a) 43 b) 64 c) 23 pairs d) 7617) Sex chromosome in female is..a) Xy b) xx c) xo d) yo

18) Sex chromosome in male isa) Xy b) xx c) xo d) yo19) AIDS is caused bya) LMV b) TMV c) HIV d) CLR20) The mineral which is very much essential for theformation ofthyroxin is a) Iron b) iodine c) copper d) zinc

OPEN ENDED QUESTIONS1) Can the environment influence the height of theperson? Justifyyour answer2) Can the growth of a human be disproportionate?Give reasons3) Do we need to consume iron? Give reasons4) Can a mother determine the sex of an unborn

baby? Give reasons5) Can we blame god for giving a female child? Givereasons6) What will happen if we inject estrogen into a boyof 10 years old?


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7) What will happen if we inject testosterone into agirl of 10 yearsold?HOTS

1) Why can humans reproduce after a certain age?2) Do all the baby parts grow in the same rate duringpuberty? Givereasons3) Why should an adolescent eat balanced food?4) Why do adolescent feel independent than before?5) Why many adolescents get acne or pimples ontheir face during

puberty?6) Why pituitary gland called is a master endocrinegland?7) Why adolescents are easy victims to drugs?8) Testis and ovary are endocrine glands. Justify yourstatement9) Who is determining the sex of a baby? How?10) Why the tadpoles in a particular pond only

increases in their sizebut do not change into frog?11) Can we classify AIDS as communicable disease?Give reasons?CHAPTER-11QUESTIONS FOR ASSESSMENTFORCE AND PRESSURE1.Identify when the velocity of the ball changes and

also the agentsupplying the force in each case.2.State the effect of force in each of the followingcases.

_ brakes are applied to a moving car_ a football lying on the ground is kicked


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_ a small piece of copper sheet is hammered to makethin foil

_ a spring is stretched by a force3.If a number of forces acts on a stationary body at

the same pointthen what do you conclude from it?4.What type of forces act on a rubber ball when it ispressedbetween two hands?what effect does it produce?5.Classify the following into contact and action at adistance force.6.When you apply force on the pedals of your cycle it

moves.thespeed of the cycle depends upon the extent of theapplied force.aslong as you pedal the cycle continues to run.stoppedaling.whathappens.7.How to find the forces acting on the rope arebalanced or

unbalanced?8.What do you understand by the term force fromthe followingdiagrams?9.What kind of force is applied?10.Find the direction of motion of an object whenforce is applied oracting on?

11.Identify the contact and action-at-a-distance forceand alsoobserve the change taking place when force acts onthe object.12.What has happened to an object when force isapplied?


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13.What will happen to an object_ 1)if both of them apply some amount of force insame direction

_ 2)if both of them apply equal amount of force in

oppositedirection

_ 3)if both of them apply unequal amount of force inoppositedirection14.What is the effect of force on a moving objectwhen it is appliedin the same direction?

15.How are pressure calculated?16.When does the pressure become more and less?17.How can you verify that pressure of liquid at anyone depth is thesame?18.In what way pressure in liquids changes withdepth?19.Does the pressure in liquids act in all the

direction?20.Why the dam wall is built thicker at the bottomthan the top?21.Why does the bigger ball have more gravitypulling on it? Becauseit weighs more? Which causes which?22.When you drop a small rubber ball and a largerubber ball

simultaneously, why do they both hit the floor at thesame time?23.When an egg falls and hits the table, the tablepushes up on it,doesn't it? The same with a bouncing ball?


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24.Ask your friend to roll a ball towards you on asmooth surface.Asit rolls towards you,push it in some direction.Wheredoes the ball go?

For Self EvaluationThe wheel of a bicycle performs __________motion.When the football player hits the ball, its speedwill _________ .When you throw a ball upwards, its speed will

__________ .Give two examples of objects changing theirspeed while in motion.What happens to the speed of your bicycle whenyou pedal faster?What happens to the speed of your bicycle whenyou apply brakes toit?A train moves with a speed of 120Km/hr. What is

the distancetravelled by it in 1 minute?A snail moves a distance of 3 metres in 300seconds. What is thespeedof the snail?

The distance between the staff room and yourclass room in yourschool is 40 metres. If your teacher takes 80

seconds to come toyour class, find out his/her speed.A body moves 10 metres in 10 seconds. Further itmoves 50 metres in


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50 seconds. Find the speed in both the cases. Isthe motion uniformor non-uniform?

_____________ force makes a rolling body stop.To collect the iron dusts from the floor ________force is used.

The unit of force is ____________.___________ force is used by the elephants in liftingheavy logs ofwood.What are the effects of forces?

Name the types of forces.Which force is responsible for raising our bodyhair when we try totake off a polyester shirt on a dry weather?Give two examples of muscular force.Choose the correct answer.(i) The force involved in the falling leaf from a treeis

(a) magnetic force (b) electric force(c) gravitational force (d) muscular force(ii) The force which is responsible for wearing outof a bicycle tyre is(a) magnetic force (b) electric force(c) gravitational force (d) frictional forceWhy does the shape of a tooth paste tube changewhen we squeeze

it?Give two examples from your daily life whereforce changes theshape of the object.


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What happens to the spring of a sofa when you siton it?

To stop the bicycle or car, we have to apply thebrake. Which forceacts?Name the two forces which act on the bodies incontact.

The gravitational force on the moon is less thanthat on the Earth.Why?Name any two objects available in your house

that are attracted by amagnet.Which pole of a magnet will repel the south poleof another magnet?Which force is used in cranes in the harbour to liftheavy load?Give examples of each of the following.(a) A force exerted on something which starts it

moving.(b) A force exerted on something which stops itmoving.(c) A frictional force exerted by gas.(d) A gravitational force on a moving body.(e) An electric force.Name the types of forces involved in the following:

(a) A magnetic door catcher (b) A person liftingthe weight(c) Balloons moving away from each other afterthey are rubbedagainst a nylon.


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Farm tractors have wheels with large, wide tyres.Why?Suggest one reason why football players havestuds on their boots.

You can carry a suitcase comfortably by thehandle. But if you haveno handle and you tie the case with string, why isit very painfulcarrying the case with your hand through thestring?What is called pressure?

What is the unit of pressure?Name the device used to measure the pressure.A boy has a mass of 50 kg. The gravitational fieldexerts a force of10 newtons on each kilogram. If the total area ofhis shoes in contactwith the ground is 100 cm2. What is the pressureexerted on the

ground?.Name the device used to measure theatmospheric pressure.People going to places of high altitudeexperiences bleeding throughnose.Why?CHAPTER-12QUESTIONS FOR ASSESSMENT

FRICTION1.What is friction?2.Is friction a contact or an action-at-a-distanceforce?3.Why a ball rolled on the ground stops after sometime?


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4.A ball is rolled on a frictionless surface and noother force acts onit.Will the speed decrease,increase or remainunchanged?

5.Why do we generally sprinkle a little talcumpowder on a caromboard,pour oil on moving parts of machine?6.Why is it more difficult to pull a boat on the beachthan on thesea?7.Why are the tyres of automobiles or sole ofsleepers made

corrugated and rough8.Why is friction a necessity?9.Why is friction considered wasteful?10.How can friction be reduced?11.How does a lubricant help in reducing friction?12.What do you conclude from the following diagrambased on thedistance travelled by same object in different nature

of surfaces?13.How will you determine the force of friction of anobject usingspring balance?14.What is the role of friction in the followingexamples of matchstick with match box and rubbing of hands?15.What is the necessity of using oil in the

machinery parts of abicycle?16.It is difficult to walk on the highly polishedfloor. Give the reason.17.State whether the following statements are trueor false.


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a)force of friction is not self adjustingb)friction is a necessary evilc)it is not difficult to write on a glazed paperd)friction reduces the efficiency of machines

e)friction between the road and the surface of thetyre permits safedrivingf)tyres of automobiles are made rough to increasefrictiong)friction generates heat.CHAPTER-13QUESTIONS FOR ASSESSMENT

SOUND1.What will be frequency of sound for audible andinaudible to humanear?2.How can you classify noise from musical sound?3.In what way the loudness of sound is related to itsamplitude ofvibration?

4.What is unit of intensity or loudness of sound?5.State the condition for the sound to have a lowerand higherpitch.Give example.6.Why police personals prefer to use dogs for theinvestigation?7.What is frequency? How is it expressed?8.How the amplitude of vibration is measured

interms ofdisplacement of an object?9.Can you hear the ringtone of a mobile when it iskept in a vacuumcontainer or room? Why?10.What is supersonic speed?


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11.How does the dolphins and whales communicatethe warning callsunderwater?12.How do you verify that the body which are

vibrating producessound?13.Sound is produced by the object only duringvibration Explainwith suitable activity.14.Can the sound travel through liquids?15.How are human beings producing sound?16.How do we hear the sound?

17.Explain the formation of vibration from the sound.18.How roar of a lion can be differentiated frombuzzing of amosquito?19.Bats can ascertain distances,directions,nature andsize ofobstacles without eyes.How?20.Explosions on other planets are not heard on

earth.Why?21.Can two astronauts talk on the surface of moon asthey do onearth?Why?22.Why are the window panes of houses sometimescracked when abomb explodes even at a large distance?23.Give suitable examples for the transmission of

sound inSolids,liquids and in gases24.Describe an experiment which shows that soundis transmittedthrough material medium.


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25.Is there sound in space? If so, what is the speed ofsound there?26.What are the harmful effects of Noise Pollution?Suggest certain

measures to reduce the noise pollution?CHAPTER-14QUESTIONS FOR ASSESSMENTCHEMICAL EFFECTS OF CURRENT1.What do you observe in the bulb when the freeends of the wire isimmersed in a vessal filled with 1)distilled water2)salt solution

3)with air?2.How does the potato help in identifying the positiveterminal ofthe battery or a cell?3.Magnetic compass shows deflection when somemagnetic field isgenerated/developed/produced nearby.In such acase what will be

the deflection of the magnetic needle when 1)morecurrent 2)lesscurrent flows?4.In what way does the conductors differ frominsulators?5.Electrical appliances should never be handled withwet hands orstanding on a wet floor.Why?

6.What are LEDs? Which lead will be connected toconnected to thenegative terminal of the battery or a cell?7.Observe the following circuit diagrams and statethe reason forthe bulb glowing in figure (a) and not in figure (b)


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8.What makes the water a good conductor ofelectricity?9.Current flows through a conducting solution.Whatare the changes

observable?10.What is known as electroplating?11.Why is electroplating preferred?12.Why are the cans of tin used for storing foodcoated on iron?13.Explain with the help simple circuit diagram,how ametal copper iscoated on electrode?

14.State the essential condition for rusting?CHAPTER NO.15SOME NATURAL PHENOMENA1. How many types of charges exist?a. One b. Three c. Two d. Four2. Who invented the lightning conductor?a. Alexander Fleming b. Graham Bellc. Benjamin Franklin d. Thomas Alva Edison

3. What device is used to protect building fromlightning?a. Crescographb. Anemometerc. Lightning Conductord. Barometer4. What scale is used to measure the magnitude ofearthquake?

a. Richter b. Celsius c. Fahrenheit d. Kilogram5. The magnitude of earthquakes that occurred atBhuj andKashmir werea. less than 4b. less than 2


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c. less than 6d. Higher than 76. Name 2 natural phenomena which cause us heavydamage.

7. Why were the people of ancient times afraid oflightning?8. What is lightning due to?9. What was the discovery made by Ancient Greeks?10. List two daily life examples where charges areproduced.11. What are charged objects?12. How can you charge the following objects?

a. glass rodb. Ebonite rod13. How can we get the following charges?a. Positive chargeb. Negative charge14. What is the principle of an electroscope?15. Distinguish static electricity from electric current.16. Like charges _________ and unlike charges

____________each other.17. What is an earthquake?18. The weak zones where earthquakes occur arecalled

_____________ zones.19. A lightning conductor provides a ______ ______ forthetransfer of charges to the ground.

20. The magnitudes of earthquakes lesser than___________on Richter scale does not cause severe damage.21. What are the various causes for earth quakes?22. Write any three harmful effects of an earthquake.23. Name the three layers of the earth.


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24. Suggest any 3 measures to protect ourselvesfromlightning.25. Label the parts of the following diagrams.

a.b. Lightning conduc torc. Structure of the earth26. Rearrange the steps in the formation of lightningin theform of a flow chart.Air become charged, accumulation of charges,movements of air

currents and water droplets, streaks of light andsound areproduced.211342

27. Construct a flow chart for the formation ofearthquake byrearranging the steps given below:-a. The plates are in motion.b. The earths crust is made up of plates.c. This disturbance forms an earthquake.d. Sometimes one plate goes under another andcauses adisturbance.

OPEN ENDED QUESTIONS1. How do two different charges interact with oneanother?2. Lightning and thunder occur together. Which oneis identifiedfirst? Why?


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3. A green coloured wire is seen in electric cables.Why is thiswire connected to earth?HOTS

1. a. What would happen if two balloons rubbed withwool arebrought together?b. What would happen if a balloon rubbed with woolis broughtnear a ball pen refill rubbed with polythene? Givereasons insupport of your answer.

2. What would happen to the leaves of anelectroscope when acharged object is placed on its metallic head?CHAPTER 16 - LIGHT1. The ray which strikes a surface is called(a) reflected ray, (B) incident ray, (C) normal, (D)perpendicularray.

2. The ray which comes from the surface afterreflection is called(A) incident ray, (B) reflected ray, (C) normal, (D)parallel ray.3. The angle made by the normal with reflectingsurface is(a) 90o, (b) 180o, (c) 45o, (d) 120o.4. The corresponding angle of reflection when angle

of incidence is30o will be(a) 45o,(b) 30 o, (c) 60 o (d) 120 o.5. Lateral inversion is formed in images formed by(a) concave


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mirror, (b) convex mirror, (c) plane mirror, (d) doubleconvexmirror.6. Which of the following part controls the size of the

pupil(a) cornea (b) iris (c) ciliary muscle, (d) optic nerve.7. What is called reflection?8. Write the laws of reflection.9. Distinguish between regular reflection and diffusedreflection?10. How can you get multiple images?11. What is called lateral inversion?

12. Write the characteristics of image formed by aplanemirror.13. Which one of the following represents regularreflection &14. Irregular reflection? (a)(b)15. What is the transparent front part of eye called?

16. Name the two types of cells present in ourretina? Whatare they sensitive to?17. What is blind spot?18. Define dispersion.19. The impression of image is persistent on theretina for(a) 1/10, (b) 1/12, (c) 1/16, (d) 1/8 of a second.

20. In old age the eye lens become cloudy. Thisdefect is called(a) Short sight, (b) long sight, (c) cataract, (d)myopia.21. What steps would you take to protect your eyes?


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22. Name the system used by visually challengedpeople forlearning.23. Label the parts of the following diagram.

24. The comfortable distance at which one can readwithnormal eye is(a) 20cm, (b) 25cm, (c) 35cm, (d) 50cm.OPEN ENDED QUESTIONS1. What enables us to see things around us?2. What care would you take to keep your eyes ingood condition?

3. What happens to your image(a) When you go towards a plane mirror?(b) When you move away from a plane mirror?HOTS1. The angle between incident ray and the mirror is60o. Whatwould be the angle of reflection?2. In a kaleidoscope various patterns are seen. What

is theprinciple involved in this?3. What is the angle between the plane mirrors in(a) periscope(b) kaleidoscopeABCDEF

4. We are unable to see the objects in a room forsome time whenwe enter the room from an open ground?5. A toy is placed between two parallel mirrors. Howmany images


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will be seen?CHAPTER 17STARS & THE SOLR SYSTEMQuestion bank

1. Which is the smallest planet of the solar system?2. Which is the nearest planet from the sun?3. The planet which is called red planet is: a.Saturn ,b. mars ,c.Venus ,d. Neptune4. The star which appears stationary is: a. Sirius ,b.pole star ,c.andromeda ,d. Orion

5. A group which forms definite pattern is called: a.comet b.constellation c. meteor d. meteoroid6. What are celestial bodies?7. What are known as phases of moon?8. Why does moon show different phases?9. Identify the following constellations10. How would you locate pole star?

11. What is an orbit?12. Which is the nearest star to us?13. What is a satellite?14. What makes the earth a special planet?15. Why does earth appears blue-green from thespace?16. Name the inert planets17. Name one outer planet.

18. What are asteroids?19. Distinguish between a meteor and meteorite.20. Match the items in column A with column BCOLUMN A COLUMN BHalleys Comet Natural satelliteMoon Appears once in 76 yrs


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Kalpana I Morning star SaturnArtificial satellite VenusHas beautiful ringsPolestar

21. Draw a neat diagram of Ursa major , Orion22. How are artificial satellites different from naturalsatellites?23. Name some artificial satellites launched by India.24. Write the applications of artificial satellites.HOTS QUESTIONS1. Moon cannot be used for communication. Why?2. What is the tail of comet due to?

OPEN ENDED1. On what days during a month can you see morestars in the sky?Give reasons.2. What keeps the planets move around the sun intheir orbits?CHAPTER 18POLLUTION OF AIR AND WATER

1. On the basis of your experience, compare thequality of air at theplace given below :-a. A park and a busy road.b. A residential area and an industrial area.c. A busy traffic intersection at different times of theday.d. A village and a town.

2. How does air get polluted?3. What is Smog?4. Ozone layer protects us from harmful ultra violetrays of the sun.Name the pollutant that damages the Ozone layer ofthe


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atmosphere.5. Marble cancer Comment6. The automobiles should switch over to unleadedpetrol in the Taj

Zone give reason.7. Name some gases that contribute towards globalwarming.8. The Gangotri Glacier in the Himalayas has startedmelting why?9. Ganga action plan launched in 1985, What does itaim at?10. What will happen if we drink polluted water?

11. Which chemicals released in water leads totoxicity in animals andplants?12. What do you mean by Potable water?13. Name the Indian River which is considered as oneof the ten mostpolluted river in world by WWF?14. Mention few industries that discharge harmful

chemicals intorivers and streams causing the pollution of water?15. What are the different ways in which water getcontaminated?MCQ1. Gas mainly responsible for green house effect isa. Carbon dioxide b. Carbon monoxidec. Nitrogen d. Oxygen

2. Trapping of un escapable radiations of sun inearths environmentis called.a. Global warming b. Green house emissionc. Green house effect d. both b and c


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3. The disease that is caused due to contamination ofwatera. Lung disorder b. rabiesc. Malaria d. Cholera

4. Corrosion of marble is also calleda. Marble disorder b. Marble erosionc. Marble Cancer d. Marvelous5. A poisonous gas emitted by mathura refinery andother industriesin and around the Taj Mahal which cause acid rain isa. Carbon monoxide b. Methanec. Sulphur dioxide d. Oxygen

6. The Taj Mahal is being affected due toa. Air Pollution b. Water pollutionc. Noise pollution d. Both a and b7. One of the most polluted ten rivers in the world isa. Cauvery b. Gangac. Krishna d. Godawari8. Which of the following is a Green house gasa. Carbon monoxide b. Carbon dioxide

c. Oxygen d. Hydrogen9. Van Mahotsav is celebrated every year in themonth ofa. June b. Julyc. April d. May10. Kyoto Protocol is an agreement connected witha. Rain water harvesting b. Global Warmingc. Aforestation d. Pisiculture

HOT QUESTIONS :1. Increased level of nutrients in the water affect hesurvival ofaquatic organisms - How?Use of Nitrogenous fertilizers Concentration of it inwater


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bodies Algal bloom Depletion of Oxygenlead to death of marine life.2. Chlorine is used in water treatment plants Givereasons.

Chlorine kills harmful germs present in water.

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