science & maths(x)

D.A.V. PUBLIC SCHOOL THERMAL COLONY PANIPATAssignment No.1 Subject: Science and Technology

Chapter: CHEMICAL REACTIONS AND EQUATIONS Class: X Sub Teacher: Sanjula Kakkar

1. What is rust? Write its chemical formula.2. Why does stale food give a bad smell and bad taste?3. What would happen to a copper vessel if it is left for a few days in humid atmosphere without being

cleaned?4. A solution of CuSO4 was kept in an iron pot. After a few days the pot developed some holes in it.

How will you account for this?5. Suggest two methods to prevent i.) rusting ii.) rancidity6. What are the two important conditions of a balanced ionic equation?7. What is redox reaction? Give an example.8. Can a displacement reaction be a redox reaction? Explain with the help of an example.9. Name the substance oxidized, reduced, oxidizing agent, reducing agent in the following reactions:a.) Ca + Cl2 CaCl2

b.) Fe2O3 + 3 CO 2Fe + 3 CO2

10. What do the following represent:a.) The arrow pointing downwards (↓) alongwith a product.b.) The arrow pointing upwards (↑) alongwith a product.

11. What is the difference between combination and decomposition reactions? Write an equation for each type.

12. What is chemical equation? What information do we get from a chemical equation?13. Classify the following reactions as combination, decomposition, displacement and double

displacement reactions.a.) 2KNO3(s) 2KNO2 (s) +O2

b.) MgO (s) + C (s) CO (g) + Mg (s)c.) Ni(NO3)2 (aq) +2NaOH (aq) Ni(OH)2 (↓) +2NaNO3 (aq)d.) CaO (s) +H2O(l) Ca(OH)2 (aq)

14. Write the balanced chemical equations for the following reactions:a.) Pb(NO3)2 (aq) +Fe2 (SO4)3 (aq) Fe(NO3)3 (aq) + PbSO4 (↓) b.) BaCl2 (aq) + Al2(SO4)3 (aq) AlCl3 (aq) + BaSO4 (↓)c.) H2S (g) + SO2 (g) S(s) +H2O (l)d.) Aqueous solution of sulphuric acid and sodium hydroxide react to form aqueous sodium sulphate and watere.) Zinc metal reacts with aqueous hydrochloric acid to produce a solution of zinc chloride and hydrogen gas.

D.A.V. PUBLIC SCHOOL THERMAL COLONY PANIPATAssignment No.2 Subject: Science and Technology Class: X

Chapter: ACIDS, BASES, and SALTS. Sub Teacher: Sanjula Kakkar

1.What is universal indicator?2.Define the term pH. Who introduced it?3. “All alkalies are bases but all bases are not alkalies”. Comment on the statement.4.What is the pH of the solution that liberates CO2 from sodium carbonate?5.State Arrhenius concept acids and bases. Giving reason select a strong acid and a weak base from the following substances H2CO3, HNO3, NaOH, NH4OH.6.Why is it to regard HCl(g) as hydrochloric acid?7.What is the difference between normal salt and acid salt?8.What is the common name of calcium sulphate hemi hydrate? How is it prepared? Write the chemical equation involved. Write one of its uses indicating the property on which it is based.9.What are constituents of baking powder? What is the function of each constituent?10.Crystals of a substance changed their colour on heating in a closed vessel but regained it after some time when they were allowed to cool. Name one such substance. Explain the phenomenon.


Chapter: METALS AND NON METALS Sub Teacher: Sanjula Kakkar

1. What are metals?2. Define the term metallurgy. Name the main steps involved in the metallurgy.3. What will happen if a strip of copper is kept immersed in a solution of silver nitrate?4. Does every mineral have a definite and fixed composition? Explain.5. Differentiate between roasting and calcinations.6. What is thermite reaction? Give an example.7. In the electrolytic refining of a metal M, name the anode, cathode and the electrolyte.8. Which one of the methods given in column I is applied for the extraction of each of the metal given in

column II Column I Column II

Electrolytic reduction Aluminium Reduction with carbon Zinc Reduction with aluminium Sodium Iron Manganese

9. Mention the constituents and properties of each of following alloys. i.) Bronze ii.) Solder iii.) Brass iv.) Stainless steel10. Give reasons for the following-

i.) Tungsten is used for making filaments of incandescent bulbs.ii.) Generally metals do not evolve H2 when react with dilute nitric acid.iii.) ZnO is called an amphoteric oxide.iv.) Non-metals do not evolve H2 gas when treated with acids.v.) Carbon is not used for making aluminium from aluminium oxide.

11. Write chemical equations for the following-i.) A piece of calcium metal is placed in water.ii.) Zinc carbonate is calcinated.iii.) Steam is passed over red hot iron.iv.) Cinnabar is heated in air.v.) Zinc sulphide is roasted.

12. Tabulate the differences between the chemical properties of metals and non- metals.

D.A.V. PUBLIC SCHOOL THERMAL COLONY PANIPATAssignment No.4 Subject: Science and Technology Class: XChapter: CABBON & ITS COMPOUNDS Sub Teacher: Sanjula Kakkar

1.Write the molecular formula of ethanol.2.An organic compound X having molecular formula C2H4O2, gives brisk effervescence with sodium bicarbonate. Give the formula and the name of X.3 The general formula of a homologous series of carbon compounds is CnH2n+1OH.Write the molecular formulae of fourth and fifth members of this series?4.Illustrate the IUPAC system of nomenclature for the following compounds: (a).CH3OH (b).C2H8OH (c ).C3H7OH.5.What happens when a dry piece of sodium metal is added to ethyl alcohol?Explain with equation.6.What happens when ethyl alcohol is warmed with alkaline potassium permagnate?7.What will be the formula and electron dot structure of Propyne?8.Write chemical equation for saponification & esterification.9.The molecular formula C3H6O can represent an aldehyde as well as a ketone.Write their structure and name them.10.Why should one condemn drinking of alcohol?11.Define isomerism.12.How is that we can use detergents not soaps for washing clothes even when water is hard?

D.A.V. PUBLIC SCHOOL THERMAL COLONY PANIPATAssignment No. 5 Subject: Science and Technology Class: XChapter: Periodic Classification of Elements Sub Teacher: Sanjula Kakkar

1. How many elements were discovered at the time of Mendleev?2. Define Atomic radius and give its variation along group and period.3. Three elements A, B and C having atomic radii 124pm, 456pm and 324pm respectively. Arrange them

according to their position in group.4. Which law was based on the notes of music?5. State Modern periodic law.6. What was the main advantage of Mendleev’s periodic table?7. What are metalloids? Explain about their position in Modern periodic table.8. Why was it necessary to change the basis of classification from atomic weight to atomic number?9. Two elements having atomic no.12 and 17 both belong to same period. State reason.10. Explain how Modern periodic law was able to tell about the position of isotopes in periodic table,

which cannot be explained by Mendeleev?11. (a) State two defects of Modern periodic table.

(b) The atomic number of X, Y and Z are 9, 11 and 17.i.) Which of them belong to the same group?ii.) Which of them belong to the same period?iii.) Which is bigger in size: X or Z and why?

12. (a) Give reason:i). A chlorine atom is smaller than a sodium atom although atomic number of chlorine (11) is greater than sodium (17).ii.) All elements of the same group have similar properties.iii.) the noble gases are placed in separate group.(b) An element X belongs to third period and group 16 of the periodic table.i) Write its electronic configuration and name.ii) What is the valency of X?

D.A.V. PUBLIC SCHOOL THERMAL COLONY PANIPATAssignment NO.6 Subject: Science and Technology Class: XChapter:LIFE PROCESSES Sub Teacher: Sanjula Kakkar

1. How does mode of nutrition of fungus different from that of tapeworm?2. How is the length of intestine related to the food habit of the animal?3. Why do we get muscle cramps after a vigorous exercise?4. Where does glycolysis occur in the cell?5. Which element is needed by plants to make proteins? What is the role of rhizobium in it?6. Using the help of flow chart write the path of oxygen from trachea respiring cells?7. What is translocation? Why is it important for plants?8. Why are arteries thick walled & elastic9. Name the largest artery in the body? 10. Write a note on lymphatic system of human beings starting 2 major functions of lymph?11. What happens to glucose, which enters the nephron along with filtrate during human excretion in

human beings? State 2 functions of kidney.12. What do you mean by double circulation of blood?

D.A.V. PUBLIC SCHOOL THERMAL COLONY PANIPATAssignment No.7 Subject: Science and Technology Class: XChapter: Control And Coordination Sub Teacher: Sanjula Kakkar

1. Which one is the thinking part of the brain?2. Diffentiate cerebrum from cerebellum?3. Describe the various types of neurons based on their functions?4. Name the growth inhibitor found in plants?5. Name a plant hormone essential for cell division.6. Name the largest endocrine gland.7. Differentiate between estrogen from progesterone?8. Draw an outline diagram of human body to show position of various endocrine glands.9. Draw a diagram to show neuro muscular junction.10. Devise an experiment to show hydro tropic response is stronger than geotropic response11. Where is pituitary gland located .Describe its various hormones.12. Draw and explain different parts of the brain.13. What is a reflex arc? Draw and explain.14. Write important functions of auxins and gibberllins?15. What is a synapse?16. Distinguish between tropic and nastic movements by giving examples.


Chapter: HOW DO ORGANISMS REPRODUCESub Teacher: Sanjula Kakkar

1.What is the basic difference between asexual and sexual reproduction?2.Which of the following organisms reproduce by asexual method? Amoeba, Cat, Birds, Hydra.3Name one organism, each which reproduces by: a. Binary fission b Spore formation c. Budding d. Fragmentation4.Where are male and female gametes formed in:a. Human beings b. Flowering plants.5.What is vegetative propagation? Give its two advantages.6.Differentiate between unisexual and hermophrodite organisms.7. Define fertilization. Where does fertilization take place in human body?8. What are STD`s? Give 2 examples.9. Draw labeled diagram of: A) Human male reproduction system b) Human female reproduction system 10. What are male and female gonads in human beings?11. What is pollination? Explain the 2 types of pollination.12. Explain the structure of flower with the help of a labeled diagram.13. Define the terms~ a) Gestation period b) Implantation c) Placenta 14. Describe the function of surgical method of birth control. 15. What is the full form of OCs? Which substances are contained in these? How do they work?

D.A.V. PUBLIC SCHOOL, THERMAL COLONY, PANIPATAssignment No.9 Subject: Science and Technology Class: XChapter: Heredity and Evolution Sub Teacher: Sanjula Kakkar

1. What are the units of inheritance in living organisms? Where are they located?2. Name the theory of evolution given by Charles Darwin & name the book in which it was given? 3. Define Genetics. What was the contribution of Mendel in this branch of biology? 4. How do embryological studies provide evidence in favor of evolution?5. How is artificial selection beneficial?6. How analogous organs provide evidence in favor evolution?7. Explain diagrammatically Mendels MONOHYBRID & DIHYBRID CROSS? 8. Humans have evolved in a tree like structure. Discuss.9. A cross between round and wrinkled seeds produced round seeds. When these were selfed out 420

seeds 300 were round &102 were wrinkled.10. A species give rise to new species with a complex body design. Will be better than the old species.

D.A.V. PUBLIC SCHOOL, THERMAL COLONY, PANIPATAssignment No.10 PHYSICS Class: X

Chapter: : LIGHT: REFLECTION AND REFRACTIONSub Teacher: Ms. Ragini

1. A ray of light incident normally on a mirror retraces its path. Why?2. State mirror formula. Will focal length of mirror changes on changing the distance of the object? If not,

why? What determines the focal length of the mirror?3. A thin lens has a focal length of –25 cm. What is the power of the lens? Is it convex or concave?4. A converging mirror form a real image of height 4 cm, of an object of height 1 cm placed 20 cm away from

the mirror. Calculate the image distance. What is the focal length of the mirror?5. An arrow 2.5 cm high is placed at a distance of 25 cm from a diverging mirror of focal length 20 cm. Find

the nature, position and size of the image formed.6. A pond of depth 20 cm is filled with water of refractive index 4/3. Calculate apparent depth of the tank

when viewed normally.7.Calculate the distance at which an object should be placed in front of a thin convex lens of focal length 10

cm to obtain a virtual image of double its size.8. A concave lens of focal length 25 cm and a convex lens of focal length 20 cm are placed in contact with

each other. What is the power of this combination? Also calculate focal length of this combination


Chapter: : HUMAN EYE AND THE COLOURFUL WORLDSub Teacher: Ms. Ragini

1. What kind of lens is there in human eye? What enables the eye to focus objects at different distances?2. Explain: a) Sun appears to rise 2 minutes before and sets 2 minutes later. b) Sky appears blue. c) Stars twinkle at night3. What is meant by persistance of vision?4. What is meant by myopia and hypermetropia? How can the two be corrected? Explain with the help of

diagram?5. A person cannot see the object distinctly hen placed at a distance less than 100 cm. What is the power

of spectacles that he should use to see clearly the objects placed at 25 cm?6. A 14-year-old student is not able to see clearly the questions written on the blackboard placed at a

distance of 5m from him (a) Name the defect of vision he is suffering from. (b) With the help of labeled ray diagrams show how this defect can be corrected (c) Name the type of lens used to correct the defect.

7. What is presbyopia? What causes presbyopia? How it can be corrected?8. Why we are not able to see immediately after we enter a darkened hall?


Chapter : ELECTRICITY Sub Teacher: Ms. Ragini

1. What is the resistance of an ideal ammeter? 2. Though the same current flows through line wires or the filament bulb yet only the later glows. Why?3. A piece of wire having resistance R is cut into four equal parts:(a) What will be the resistance of each part, compare with the original resistance?(b) If four parts are placed in parallel, what will be the total resistance?4. What is the difference between resistance and resistivity?5. The potential difference between the terminals of an electric iron is 240V and the current is 5A. What

is the resistance of electric iron?6. You are given three resistance of 1,2,3 ohms. How by diagrams how with the help of these resistance

you can get: (a) 6 ohms (b) 1.5 ohms7. An electric bulb is rated as 240V and 40W. (a) Find the resistance of the filament and current then

used at rated voltage. (b) Find the power consumed by it and current through it when used at 120V.8. 100J of heat are produced each second in a 4 ohms resistance. Find the potential difference across the

resistor?9. What is the direction of flow of electric current?

D.A.V. PUBLIC SCHOOL, THERMAL COLONY, PANIPATAssignment No.13 PHYSICS Class: XChapter : MAGNETIC EFFECTS OF ELECTRIC CURRENT

Sub Teacher: Ms. Ragini

1. Name the alloy that is used for making permanent magnets.2. What is the S.I. unit of magnetic field?3. What is the role of a fuse in the electric circuits?4. What are magnetic field lines? How is the direction of a magnetic field at a point being determined?

Mention important properties of magnetic field lines.5. A coil of copper wire is connected to a galvanometer. What would happen if a bar magnet is: (i) pushed

into the coil with its north pole entering first. (ii) held at rest inside the coil. (iii) pulled out again.

6. What is earthing? How does it work as a safety measure?7. What is the capacity of an electric fuse used in (i) lighting circuit (ii) power circuit in house hold supply?8. How does AC differ from DC? What are the advantages of AC over DC?9. Draw the pattern of lines of force due to a magnetic field through and around a current carrying loop of

wire. How would the strength of the magnetic field produced at the center of the circular loop be affected if (a) the strength of the current passing through this loop were doubled. (b) the radius of the loop is reduced to half of the original radius.

D.A.V. PUBLIC SCHOOL, THERMAL COLONY, PANIPATAssignment No.14 PHYSICS Class: XChapter : SOUCES OF ENERGY Sub Teacher: Ms. Ragini

1. Define ocean thermal energy.2. Name any two materials that are used for making solar cells.3. Why is the solar cooker box covered with the plane glass plate?4. Why is biogas a better fuel than animal dung cakes?5. Explain the principal of working of ocean thermal energy conversion power plant.6. Mention any two advantages and disadvantages of producing hydroelectricity by building dams on

rivers.7. “Obtaining of energy from nuclear fusion reactions is preferable to obtaining of energy from nuclear

fission reactions.” Justify your statement giving atleast two reasons.8. Describe the working of biogas plant.9. Why are solar heating devices painted black from inside?10. State four factors responsible for energy crisis.11. “ Is it possible to live without electricity at present”? Comment.

D.A.V. PUBLIC SCHOOL THERMAL COLONY PANIPATAssignment No.15 Subject: Science and Technology Class: XChapter: Our Environment Sub Teacher: Sanjula Kakkar

1.Which of the following materials are biodegradable? Aluminium wire, Tea leaves, Synthetic fibre and wool.2 Arrange the following in a food chain: Fish, Algae, Small animals and Big fish.3.Define tropic level. Draw the food chain with four tropic level.4.In a food chain consisting of grass, frog, bird and insects, where will the concentration of the harmful chemical be maximum?5.What is meant by bioconcentration of pestisides? Which common pestisides has accumulated in human body in considerable amounts?6.If we use excess pestisides to protect the crops from diseases,then it may cause long term damage to mankind.Justify the statement.7.What is the difference between food chain food web?Give suitable examples. Explain how harmful chemicals enter our bodies.8.What is ozone and how does it affect any ecosystem?9. Write a note on the flow of energy through different steps in the food chain. 10.Consider the food chain: Grass-Goat-Tiger.If tiger has 30 J of energy available in this food chain, how much energy was originally available in grass?11.What is 10%law? Explain with an example how energy flows through different tropic levels.

D.A.V. PUBLIC SCHOOL THERMAL COLONY PANIPATAssignment No.16 Subject: Science and Technology Class: XChapter: Management of Natural Resources Sub Teacher: Sanjula Kakkar

1.Name the three R’s to save the environment. Explain each of them.2.What is ‘Amrita Devi Bishnoi National Award’?3.Explain the role of forests in conserving the environment. How do forests get depleted? What are its consequences?4.What is Narmada Bachao Andolan?5.What are the advantages of building dams?6.How do you achieve sustainable development?7.How is Khejari tree related to the preservation of biodiversity?8.How do we find contamination of water?9.How is conservation indifferent from preservation?10.How does socio-cultural environment affect human beings?11.Name any two wastes that can be recycled and reused.12.How can you as an individual contribute or make a difference to the management of: (a) forests and wild life. (b)water resources (c)coal and petroleum?

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