Syllabus for Class X July Test 2018

Science

1) Physics :- Electricity

2) Chemistry :- a) Chemical reaction and equations

b) Acids, bases and salts (upto page 24)

3) Biology :- Life Processes.

HOLIDAY ASSIGNMENT

CLASS X (BIOLOGY)

Term I

Life Processes

Q.1. Why do aquatic animals breathe faster than the terrestrial animals?

Q.2. What advantage over an aquatic organism does a terrestrial organism have with regard

to obtaining O2 for respiration?

Q.3. What will be the outcome if a farmer floods his field every day?

Q.4. Due to availability of less water, how does the plant cope up with lack of water in

desert conditions?

Q.5. Food moves down the food pipe by peristalsis. Which region controls peristalsis?

Q.6. Which equipment is used to facilitate breathing during serious breathing problems?

Q.7. What is blood pressure? How is it measured? Give one difference between systolic

and diastolic pressure

Q.8. Draw a neat diagram of excretory system of human being and label the parts kidney,

ureter, urinaryblader, and urethra.

Q.9. How is transpiration of water in xylem tissue different from translocation of food in

phloem tissue.

Q.10 What is the role of light in photosynthesis?

Q.11 Differentiate between lymph and blood.

Q.12 Why does anaerobic respiration produce less energy compared to aerobic respiration?

Q.13 Why are the walls of ventricles thicker than auricles?

Q.14 Bile juice does not contain any digestive enzymes, yet it is essential for digestion, why

so? Explain.

Q.15 If one holds his breath after exhalation for about 30 sec. Will there be any exchange of

respiratory gases in the lungs during this period .

Activity -1

Q. Solve the Puzzle-

Across:

1. Pores through which plant looses water in

atmosphere(7)

5. Upper chamber of heart (7)

6. Vessels which carry oxygenated blood (6)

7. Structure which prevents collapse of air

passage (9)

8. Protein digesting enzyme secreted by

pancreas (7)

9. Membrane which closes the floor of thoracic

cavity (9)

10. Tissue which transports water from root to

Other parts (5)

Down :

2. Process by which artificial kidney remove

waste products from body (8)

3. Balloon – like structures within the lungs (7)

4. Membrane which covers heart (11)

Activity -2

Q Respiration rate is the number of breathe term in each minute. A breathe is (1)

inhalation and (1) exhalation.

Record the data of the experiment in the following table:-

S.No Student’s

Name

Activity

At rest Walking Running

T1 T2 T3 Average T1 T2 T3 Average T1 T2 T3 Average

a) Calculate your respiratory rate at rest, walking and running.

b) What are different respiratory ailments?

c) How can you as a student protect your environment to get rid of various

respiratory problems?

Assignment Hots / Optional

Q1. What is compensation point?

Q2. What is peptic ulcers and how are they caused?

Q3. What is ascent of sap?

Q4. What happens to glucose which enters the nephron along with the filtrate?

Q5. How does respiration occur in the roots of the plant?

Q6. Give the role of liver in human beings.

Q7. Why is small intestine in herbivores larger than in carnivores?

Q8. Leaves of a healthy potted plant were coated with Vaseline to block the stomata. Will

this plant remain healthy for long? State three reasons for your answer?

Q9. Why is more concentrated yellowish urine excreted in summers?

Q10. If a plant is releasing carbon dixide and taking in oxygen. During the day does it mean

that there is no photosynthesis occurring? Justify your answer?

CLASS X

CHEMICAL REACTIONS AND EQUATIONS

Q.1. What type of reactions are represented by the following equations ?

(a) A + B AB (b) C A+ B

(c) AL + X AX + L (d) AB + CD AD + CB

(e) Cl2 + 2KI 2KCl + I2 (f) 2 Mg + O2 2 MgO

(g) 4HNO3 4NO2 + 2H2O + O2 (h) AgNO3 + HCl AgCl + HNO3

Q.2. A Shiny brown substance X on heating in air turns black and a new compound Y

is formed. Name the substance X and black compound Y.

Q.3. Why oily and fatty food items are flushed with nitrogen gas ?

Q.4. Name the substances oxidized, reduced, oxidizing agent and reducing agent in

the following reactions :

(i) Ca + Cl2 CaCl2

(ii) 3MnO2 + 4 Al 3 Mn + 2Al2O3

(iii) Fe2O3 + 3CO 2 Fe + 3CO2

(iv) Fe + S FeS

Q.5. Gold and silver do not corrode in moist air. Give reason.

Q.6. (a) Does rusting represents oxidation or reduction of Iron ?

(b) Which process is responsible for the rancidity of fatty foods ?

(c) Write the main purpose of painting iron gates .

(d) Where butter will become rancid ? (i) in refrigerator (ii) on shelf in the kitchen

Q.7. Give an example to explain that oxidation and reduction occur simultaneously.

Q.8. What is meant by photo-decomposition reaction ? Give on example.

Q.9. A solution of a substance ‘X’ is used for testing CO2. Identify ‘X’. What will be its

reaction with CO2 ? Write balanced chemical equation for the reaction.

Q.10. What happens when ferrous sulphate crystals are heated? Explain with the help

of chemical equations. What type of reaction it is ?

CHAPTER2

ACIDS AND BASES

Q.1. Yellow spot of turmeric on clothes turns brown when it comes in contact with

water and soap. why ?

Q.2. Give one example of each of the of following :

(i) A basic oxide which is soluble in water what is the formula of the compound.

(ii) A hydroxide which is highly soluble in water.

(iii) A basic oxide which is insoluble in water.

(iv) A hydroxide which is insoluble in water.

Q.3. Do basic solutions also contain H+ (aq) ions ? If yes , then why are these basic ?

Q.4. Under what soil condition a farmer would treat the soil of his field with quick lime

or slaked lime or chalk ?

Q.5. The pH values of solutions marked A, B, C, D and E are 4, 1, 11, 7 and 9

respectively.

(i) Arrange these solutions in the decreasing order of pH values .

(ii) Arrange these solutions in the increasing order of hydrogen ion concentration

(iii) In the list of the given solutions identify :

(a) Neutral solution (b) highly alkaline solution

(c) highly acidic solution (d) less acidic solution

(e) Less basic solution

Q.6. What can you say about the pH of a solution that liberates CO2 from sodium

carbonate.

Q.7. How would you distinguish between baking powder and washing soda by

heating?

Q.8. Salt A commonly used in bakery products on heating gets a converted into

another salt B which itself is used for removal of hardness of water and gas C is

evolved. The gas C when passed through lime water, turns it milky. Identify A,

B.and C .

Q.9. What happens when nitric acid is added to egg shell ? Give equation also.

Q.10. What are strong and weak acids ? In the following list of acids, separate strong

acids from weak acids

HCl, citric acid, acetic acid, nitric acid, formic acid, sulphuric acid

Chapter 3

METALS AND NON METALSS

Q.1. A student was given Mn, Zn, Fe and Cu metal. Identify which of them

(a) will not displace H2 from dil. HCl

(b) will react only with steam to give H2 (g)

(c) will give H2 with 5% HNO3

Write the chemical reactions involved.

Q.2. A metal ‘X’ loses two electrons and a non metal ‘Y’ gains one electron. Show the

electron dot structure of compound formed between them. Is it ionic or covalent ?

Does it have high melting point or low ? Will it conduct electricity is solid state or in

aqueous solution and why ? Will it be soluble in water ?

Q.3. What is 24 Carat gold ? How will you convert it into 18 carat gold ?

Q.4. Give reasons :

(a) Aluminium oxide is considered as an amphoteric oxide

(b) Ionic compounds high melting points

Q.5. Give reasons for the following observations :

(a) Zinc fails to evolve hydrogen gas on reaching with dilute nitric acid.

(b) Metal sulphides occur mainly in rocks but metal halides occur mostly in sea and

lake waters.

Q.6. Why electric wires are covered with rubber like material ?

Q.7. From dilute hydrochloric acid, zinc can liberate hydrogen gas but copper can not .

Why ?

Q.8. Why is sulphide ore of a metal is first converted to its oxide to extract the metal

from it ?

Q.9. An ore on heating in air produces sulpher dioxide. Which process would you

suggest for its concentration. Describe briefly any two steps involved in the

conversion of this concentrated ore into related metal.

Q.10. Explain why

(a) Reactivity of Al decreases if it is dipped in HNO3

(b) Carbon can not reduce the oxides of Na or Mg.

SA – 2, CHAPTER 4

CARBON AND ITS COMPOUNDS

Q.1. Ethane, with the molecular formula C2H6 has :

(a) 6 covalent bond (b) 7 covalent bonds

(c) 8 covalent bonds (d) 7 covalent bonds

Q.2. Which of the following hydrocarbons undergo addition reactions :

C2H6, C3H8, C3H6, C2H2 and CH4

Q.3. How would you bring about the following conversions ?

(a) Ethane to Ethene

(b) Propanol to Propanoic acid

Q.4. Give chemical test to distinguish between saturated and unsaturated

hydrocarbons.

Q.5. An organic compound ‘A’ is a constituent of wine and is also used as a fuel in

spirit lamp. Compound ‘A’ on heating with alkaline potassium permanganate

gives another compound ‘B’ which turns blue litmus to red. Compound ‘A’ and ‘B”

combine in the presence of Conc. H2SO4 to give a sweet smelling compound ‘C’.

Identify compound ‘A’, ‘B’ and ‘C’ Also write the equations involved in the reaction.

Q.6. Why is CNG considered environmental friendly fuel ?

Q.7. Justify acidic nature of Ethanol with the help of a equation.

Q.8. A compound ‘A” has molecular formula C3H8O and react with Na-metal to evolve

H2 gas. Identify the compound and write all possible isomers of the compound.

Q.9. Explain the following terms :

(a) Esterification (ii) Saponifcation (iii) Decarboxylation

Q.10. Give reasons for the following observations :

(a) Air holes of a gas burner have to be adjusted/cleaned when the vessels kept on

flame get blackened by it.

(b) Use of synthetic detergents cause pollution of water.

Q.11. (i) Draw the electron dot structure or

(a) Propanal (b) Propyne

(ii) How would you name the following compounds :

(a) CH3 — CH2 — CH2 — CH2 — Cl

O II

(b) CH3 — CH2 — C — CH3

O II(c) H — C — H

CHAPTER 5

PERODIC CLASSIFICATION OF ELEMENTS

Q.1. Name two elements you would expect to show chemical reactions similar to

Magnesium. What is the basis of your choice ?

Q.2. Atomic number is considered to be more appropriate parameter than atomic mass

for classification of elements in a period table. Why ?

Q.3. (a) How do you calculate the valency of an element from its electronic

configuration ?

(b) What is the valency of Mg with atomic no. 12 and sulpher with atomic no. 16 ?

(c) How does valency vary across the period and down the group in modern pd.

table.

Q.4. Explain why sodium is more reactive than lithium ?

Q.5.Choose the following from modern periodic table:

(a) the most electropositive element .

(b the most electronegative element.

(c) the element with smallest atomic size.

(d) the element which is a metalloid.

(e) the element which shows maximum valency.

Q.6. A metal M forms an oxide having the formula M2O3 It belongs to third period in the

modern periodic table. Write the atomic number and valency of the metal.

Q.7. Suppose the elements of the triad proposed by Dobereiner are P, Q and R. If the

atomic mass of P is 6.9 and that of R is 39. Find the atomic mass of Q.

Q.8. If an element X is placed in group 14, what will be formula and nature of bonding

of its chloride ?

Q.9. Is it possible to have an element with atomic number 2.5 ?

Q.10. Compare the radii of two species X and Y. Give reasons for your answer :

(a) X has 12 protons and 12 electrons

(b) Y has 12 protons and 10 electrons

X ,..f-- CBSE QUESTION BANK

Question Bank from ELECTRICITy1

1..

J.

10. Deflne electric power. What is its S.l. unit?11.' A wire of resistivity p is stretched to twice its

(1 mark)12. Define the unit "ohm,,.

4.

What is the Sl Unit of electric potential?what dr: you mean by the statement; ,'The erectric potentiar between thepointsAand B is 1V,,?There are two electric burbs, one marked 60w 22av and the ether marked100w 220v . which one of the two has a higher resistance?of the two; a toaster of 1 kw and an erectric heater of 2 k\r,/, which hasJrigherresistance?

Name a metal which offers higher resistance to the passage of electricity thancopper.

calculate the ratio of resistances of a 50w bulb and a 25 w bulb.why rs tungsten preferred to make the filament of an incandescent lamp?A wire of resistance 10 Ω is bent in the form of a circle" What is theeffective resistance between the two points at the ends of any one of thedrameter of the circle?Whai is mean by saying that the "potential difference between two points is 1volt".

q

b-

7.

8.

I

iength. What is new resistivity?

across a

14.

15.

16.

13. Name a device that helps to maintain a potential differenceconductor.

Define resistivity. Write the S.l. unit of resistivity,,will current frow more easiry through a ihick wire or thin wire of the samematerial when connected to the same sources? Why?A wire of resistance 10E€is drawn out so that its length is thrice its originallength. Calculate ohr"e

(i) lts new resistance (resistivity and density of the wire remainunchanged).

(ii) Define resistivity and state its s.r. unit. Does it its varue vary withtemperature.

What are the factors on which the resistance of a conductor depends? Givethe corresponding relation.What is voltmeter? How is it connected in a circuit?Three resistors R1, R2 an R3 are connected in parallel. Find their equivalentresistance (resultant resistance).

\1t

II17.

18.

19.

?o

/

zu.

71"

What is..electric current? What do youdirection of the flow of current? How is the

understand by the conventional '

unit ampere defined?

equivalent

i. Name two factors on which the erectric energy consumed by anelectrical appliance depends.

ii' ln which of the following cases more electrical energy !s consumed perhour?

a. A current of 1 ampere passed thro,ugh a resistance of 300ohms.

b. A current of 2 amperes passed through a resistance of 100ohms.

(a) what is meant by'Electric Resistance' of a conductor?(b) A wire of length L and resistance R is stretched so that its length isdoubled and the area of cross-section is halved. How wiil its:(i) resistance change?(ii) resistivity change?

Three resistances R1, R2 and R3 are .loined in series. Find theirresistance.

24 State ohm's law. Describe an experiment with a neat iabelled circuit diagramto verrfy ohm's law.

Magnetic Effects of Electric Current

22.

ZJ.

1.

2.

3.

4.

5.

b.

7.

8.

9.

10.

11.

12.

13.

14.

Why natural magnet was called Lodestone?Write two common properties of magnet.Can y,o',t n'lake a iriagnei having a norih po!e oniy?Define magnetic fieldWhat are magnetic field lines?Draw magnetic field lines around a bar magnet.Write two properties of magnetic field lines.What is the shape of magnetic field lines around a straight conductor carryingcurrent?

kt,*n:bState right hand #fliijre.state two factors o',i*t',i"r, the strength of magnetic field.at a point due to acurrent carrying cond,uctor depends.Draw a diagram of magnetic field lines due to current carrying circular loopWhat.b a solenoid?Draw a diagram showing the patternsolenoid.

State the factors affecting the strength

of field lines alound a current carrying

of rnagnetic field due to a solenoid.

40

15. How will you determine the polarit;l cf a solenoid from the direction of

current?

16. What is an electromagnet?

17. How can we increase the strength of an electromagnet?

18" State Fleming's left hand rule.

19. What is an eiectric motor?

20. State the principle of working of an electric motor.

21. What is electromagnetic induction?

22. What is magnetic flux?

23. State Fieming's right hand rule'

24, What is an electric generator or a dynamo?

25. Write the differences between ac and dc dynamo.

26. How is the alternating current produced in a dc generaior converted to dc in

the output?

27. Write the advantages of AC over DC

28. Wr-ite the color coding of wires in donrestic circuits.

29. Why is svuitch ccnnected always to the iive wire only?

30. What is an electric fuse? Explain lts',^''cr'king.

31. What is earthing?

32. Explain the terms "short circuiting" anci Cver Loading"?

33. What are the materials used for makrng eiectric fuse and explain why?

34. State SNOW rule.

35. Draw diagram showing (i) uniform magnetic field (ii) Non uniform magnetic

field.

36. Draw a schematic diagram showing tTpical domestic wiring.

SOURCES OF ENERGY

1. "Energy can neither be created nor be destroyed". Then why do we talk about

'Energy Crisis"?

What do you mean by'ltransformation of Energy"?

State the law of conservation of energy- :

Write the characteristics of a good source of energy"

What are the criteria for selecting a good fuel?

What are fossil fuels?

What are renewable and non renewable sources of energy?

How can we degrease pollution caused by burning of fossil fuels?

Write the advantages and disadvantages of fossil fuels- : .

How is electrical energy produced in thermal powerplant?

How is electrical energy produced in hydel powerplant?

41

/J"

4.

5.

6.

COLLECTION EF HOTS QUESTIONS

.EGTRICITYWhy effective resistanceisdecreasedwhenresistorsareconnectedinparallel

Explain the principle behind Faraday's Experiments on electromagnetic

induction

why ohm's law does not hold good under conditions of varying temperature?

lf a wire of length I and area of cross section A is fused with a similar wire to

double its length, then what will be the new (a) resistance (b) Resistivity

How manY KWh s make 1 joule?

How can you make a 3 O resistance by combining with a number of 2 Q

resistors available with You"

7. Four resistances 2.0 () each are eonnected end to end to form a square

ABCD. Calculate the equivalent resistance of the combination between: (i)

any two adjacent corners (ii) any two oppostte corners'

MAGNETIC EFFECTS OF CURRENT

lf a magnetic needle is placed at the Norih Pole in horizontal plane' which

direction will it show? WhY?

A wire hidden inside a wall carries a current. How will yoiu find out whether

the wire is horizontal or verlical?

1.

2

43