APRIL MAY 2017 ASSIGNMENT

“IF YOU ARE SATISFIED WITH OUR TEACHING TELL TO OTHERS IF NOT TELL TO US”

FOR PRIVATE CIRCULATION ONLY

“You don’t know what you can do until you try”

MULTIPLE CHOICE QUESTIONS

Bismillah MERIT CLASSES 5 years of success

NAME : - ______________________________

STANDARD : - 10TH CBSE

CLASSES : - MERIT CLASSES

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CLASS 10 TH MERIT CLASSES 2017

CHEMICAL REACTIONS AND EQUATIONS

SECTION- A 1 MARKS

1. What happens when the milk is left at room temperature during summer?

2. Write a chemical equation when magnesium is burnt in air to

give magnesium oxide.

3. A substance under goes chemical reactions to produce

simpler products, what type of reaction is this?

4. Why do copper vessels lose their shine when exposed to air?

5. Which gas is produced by the action of dilute

hydrochloric acid on zinc granules?

6. Fe2O

3 + 2Al Al

2O

3 + 2Fe

The above reaction is an example of which type of reaction.

7. Name the type of reaction in which energy is absorbed.

8. Why does the color of copper sulphate solution change when

an iron nail is dipped into it?

9. Give an example of decomposition reaction which

proceeds by absorbing electric energy.

10. Why do we balance the chemical equation?

SECTION- B 2 MARKS

1. Write down the observations which indicate the occurrence of a

chemical reaction.

2. Why is respiration considered as an exothermic reaction? Explain.

3. Transfer the following statements into Chemical equations and then balance

them.

a) Hydrogen gas combines with nitrogen to form ammonia.

b) Potassium metal reacts with water to give potassium hydroxide and

hydrogen gas.

4. Identify the substances that are oxidized and the substances that are reduced

to the following reactions.

1. Na + O2

Na2O

(s) (g) (s)

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CLASS 10 TH MERIT CLASSES 2017

2

2

CuO + H2

Cu + H2

O(l)

(s) (g) (s)

5. What happens when silver chloride is exposed to sunlight? Give one practical

application of this reaction. Write the equation also.

6. Why is the bag used for potato chips flushed with nitrogen gas?

SECTION- C 3 MARKS

1. Write down the balanced chemical equations for the following reactions.

a) Zinc Carbonate(s)

Zinc Oxide + Carbon Dioxide(g)

b) Aluminium(s)

+ Chlorine(g)

Aluminium Chloride(s)

c) Magnesium(s)

+ Water(l)

Heat Magnesium Hydroxide(l)

+ Hydrogen(g)

2. Choose combination, displacement and double displacement reactions out of

the given reactions.

i) MnO2

(s)

+ 4HCl(l)

MnCl2 (s)

+ Cl2 (g)

+ 2H O (l)

ii) CaO(s)

+ CO2

(g) CaCO

3(s)

iii) 2AgCl(s)

2Ag(s)

+ Cl2(g)

3. What happens when CO(g)

is passed through slaked lime? Write the balanced

chemical equation. Write the type of reaction that has occurred.

SECTION- D 5 MARKS

1. Balance the following chemical equation and identify the type of reaction they

represent

KClO3

KCl + O2

NH3

+ O2

NO + H2O

Na2O + H

2O NaOH

Na + H2O NaOH + H

2

FeCl3

+ NaOH Fe (OH)3

+ NaCl.

2. Define various types of chemical reactions. Write one chemical equation for

each type.

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ELECRICITY CLASS10TH ( SA1)

7) What is the unit of resistance?

8) Define 1 Ohm.

9) What is Power?

10) What is the SI unit of power?

11) How many watts are equal to 1 horse–power?

12) What is the heating element in electric bulb made of?

13) What is a voltammeter?

14) How many extra electrons are present on a body having 2 coulombs of negative charge?

15) Which electrical quantity has the unit ohm–metre.

16) What happens to the resistivity of a conductor if the length of the wire is reduced to half andradius of the wire is doubled?

17) Define potential difference. Give its SI unit.

18) Give the commercial unit of electrical energy.

19) What is volt ampere?

20) The resistivities of a few substances at 20 C is given below. Arrange them in decreasing order

of their conductivity. (Glass = 1012

m, Nichrome = 100 10–6

m, Silver = 1.6 10–8

m,

Mercury = 94 10–8

m).

Short Answer Questions: 2 Marks

21) Explain the concept of resistance.

22) Mention two applications of heating Effects of current.

23) State Joule’s law of heating effect.

24) Why is nichrome used in most heating devices?

Short Answer Questions: 3 Marks

25) Derive an expression for three resistance connected in series.

26) Derive an expression for three resistance connected in parallel.

27) Explain the working of Electric bulb.

28) Draw a circuit diagram showing two resistances of 5 each in parallel and the combination in

series with 10. Connect the above combination to a cell, an ammeter and switch. Also showthe direction of current.

29) Two lamps are rated 100W at 220V and the other 60W at 220V and are connected in parallelto a 220V supply. What is the current drawn from it.

30) State the characteristics of a fuse wire.

31) Why is household wiring done in parallel?

(Problems)

1) An electric iron consumes 1KW electric power when operated at 220V. What is theminimum rating of the fuse of be used for safe use of this device?

2) A 1000 W electric geyser is used every day for one hour. How many units of electrical energywill it consume in 30 days?

3) A 200 watt bulb is lighted for two hours. How much energy is consumed?

4) A house is fitted with five 100 watt lamps. How many units of electrical energy are consumedby lighting the lamps for a month of 30 days at a rate of 2 hours a day?

5) An electric heater is used every day for 120 minutes. The electricity bill for 30 days is 60 units.

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ELECRICITY CLASS10TH ( SA1)

6) Calculate the energy supplied by 10 kilowatt of power in one hour. Give the answer in Joule.

7) A 1000 W electric oven is used everyday for 90 minutes. Calculate the units of electricalenergy this oven will consume in 30 days of use.

8) A shopkeeper used 1000W electric heater for 5 hours and 200 W electric bulb for 10 hoursevery day. Calculate the cost of using the heater and bulb for 20 days if the cost of oneunit of electrical energy is one rupee.

9) A house contains 6 bulbs of 60W each, 3 fans of 80W each and a room heater of 500 W. Ifeverything is operated for 4 hrs a day on the average, how many units of energy will beconsumed in a month of 30 days? If electricity costs Rs.1.25 per unit, how much will be the costof electricity used in the house in that month?

10) A parallel combination of three resistors takes a current of 7.5A from a 30V supply. If the

two resistors are 10 and 12, find the third one?

11) A lamp of 100 W works at 220volt. What is its resistance and current capacity?

12) A current of 5.0A flows through an electric press of resistance 11. Calculate theenergy consumed by the press in 5 minutes?

13) What will be the cost of running 500W heater for 20 hrs at the rate of Re. 0.80 per unit?

14) Two resistances connected in series have an effective value of 10. When connected in

parallel, the effective value is 2.5. What are the values of the resistances?

15) Find the combined resistance

between points A and B.

16) Three resistances 10, 5, 15 are connected in parallel. Find the equivalent resistance ofthe combination.

17) Raman performed an experiment by connecting a cell, an ammeter and different resistances asshown. What would the ammeter reading be in (b) and (c)?

18) Find the equivalent resistance across A and B.2 2

A

2 2 2 2 2

2 2B

19) A house contains 6 bulbs of 60W each, 3 fans of 80W each and a room heater 500 W. If eachof them is used for four hours a day, find the cost of electrical energy for the month ofSeptember, if a unit costs Rs.1.85.

20) Find the equivalent resistance between A and B.

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MULTIPLE CHOICE QUESTIONS

1. 5 × 11 × 13 + 7 is a

(a) prime number (b) composite number

(c) odd number (d) none

2. Which of these numbers always ends with the digit 6.

(a) 4n (b) 2n

(c) 6n (d) 8n

where n is a natural number.

3. For a, b (a b) positive rational numbers a b a b is a____

(a) Rational number (b) irrational number

(c) 2

a b (d) 0

4. If p is a positive rational number which is not a perfect square then 3 p is

(a) integer (b) rational number

(c) irrational number (d) none of the above.

5. All decimal numbers are–

(a) rational numbers (b) irrational numbers

(c) real numbers (d) integers

6. In Euclid Division Lemma, when a = bq + r, where a, b are positiveintegers which one is correct.

(a) 0 < r b (b) 0 r < b

(c) 0 < r < b (d) 0 r b

7. Which of the following numbers is irrational number

(a) 3.131131113... (b) 4.46363636...

(c) 2.35 (d) b and c both

REAL NUMBERS

ASHISH PATRICK 9096367146 Page 6

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8. The decimal expansion of the rational number 421

7 2 5

will terminate

after ___ decimal places.

(a) 8 (b) 4

(c) 5 (d) never

9. HCF is always

(a) multiple of L.C.M. (b) Factor of L.C.M.

(c) divisible by L.C.M. (d) a and c both

10. The product of two consecutive natural numbers is always.

(a) an even number (b) an odd number

(c) a prime number (d) none of these

11. Which of the following is an irrational number between 0 and 1

(a) 0.11011011... (b) 0.90990999...

(c) 1.010110111... (d) 0.3030303...

12. pn = (a × 5)n. For pn to end with the digit zero a = __ for natural no. n

(a) any natural number (b) even number

(c) odd number (d) none.

13. A terminating decimal when expressed in fractional form always hasdenominator in the form of —

(a) 2m3n, m, n 0 (b) 3m5n, m, n 0

(c) 5n 7m, m, n 0 (d) 2m5n, m, n 0

14.

3 3– 5 5

4 4 is

(a) An irrational number (b) A whole number

(c) A natural number (d) A rational number

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15. If LCM (x, y) = 150, xy = 1800, then HCF (x, y) =

(a) 120 (b) 90

(c) 12 (d) 0

16. Which of the following rational numbers have terminating decimalexpansion?

(a)91

2100 (b)64

455

(c) 2 3 3

3435 2 7

(d) 3297

SHORT ANSWER TYPE QUESTIONS

17. Solve 18 50. What type of number is it, rational or irrational.

18. Find the H.C.F. of the smallest composite number and the smallest primenumber.

19. If a = 4q + r then what are the conditions for a and q. What are the valuesthat r can take?

20. What is the smallest number by which 5 3 be multiplied to makeit a rational no? Also find the no. so obtained.

21. What is the digit at unit’s place of 9n?

22. Find one rational and one irrational no. between 3 and 5.

23. State Euclid’s Division Lemma and hence find HCF of 16 and 28.

24. State fundamental theorem of Arithmetic and hence find the uniquefactorization of 120.

25. Prove that

12 5

is irrational number.

26. Prove that 25 3

7 is irrational number.

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27. Prove that 2 7 is not rational number.

28. Find HCF and LCM of 56 and 112 by prime factorisation method.

29. Why 17 + 11 × 13 × 17 × 19 is a composite number? Explain.

30. Check whether 5 × 6 × 2 × 3 + 3 is a composite number.

31. Check whether 14n can end with the digit zero for any natural number, n.

32. If the HCF of 210 and 55 is expressible in the form 210 × 5 + 55y thenfind y.

LONG ANSWER TYPE QUESTIONS

33. Find HCF of 56, 96 and 324 by Euclid’s algorithm.

34. Show that the square of any positive integer is either of the form 3m or3m + 1 for some integer m.

35. Show that any positive odd integer is of the form 6q + 1, 6q + 5 whereq is some integer.

36. Prove that the square of any positive integer is of the form 5q, 5q + 1,5q + 4 for some integer q.

37. Prove that the product of three consecutive positive integers is divisible by 6.

38. Show that one and only one of n, n + 2, n + 4 is divisible by 3.

39. Two milk containers contains 398 l and 436 l of milk. The milk is to betransferred to another container with the help of a drum. While transferringto another container 7l and 11l of milk is left in both the containersrespectively. What will be the maximum capacity of the drum.

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2. The zeroes of a polynomial f(x) are the coordinates of the points wherethe graph of y = f(x) intersects

(a) x-axis (b) y-axis

(c) origin (d) (x, y)

3. If is 0 zero of f(x) then ____ is one of the factors of f(x)

(a) (x – ) (b) (x – 2)

(c) (x + ) (d) (2x – )

4. If (y – a) is factor of f(y) then ___ is a zero of f(y)

(a) y (b) a

(c) 2a (d) 2y

5. The graph of a linear polynomial will meet the x-axis at – points,

(a) 1 (b) 2

(c) 3 (d) None

6. Cubic polynomial x = f(y) cuts y-axis at atmost

(a) one point (b) two points

(c) three points (d) four points

7. Polynomial x2 + 1 has ___ zeroes

(a) only one real (b) no real

(c) only two real (d) one real and theother non-real.

8. What type of graph will –x2 + 3x – 4 represents

(a) straight line (b) upward parabols

(c) down ward parabola (d) none

9. If degree of polynomial f(x) is ‘n’ then maximum number of zeroes of f(x)would be –

(a) n (b) 2n

POLYNOMIALS

MULTIPLE CHOICE QUESTIONS

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(c) n + 1 (d) n – 1

10. If 2 is a zero of both the polynomials, 3x2 + ax – 14 and 2x – b thena – 2b = ___

(a) –2 (b) 7

(c) –8 (d) –7

11. If zeroes of the polynomial ax2 + bx + c are reciprocal of each other then

(a) a = c (b) a = b

(c) b = c (d) a = – c

12. The zeroes of the polynomial h(x) = (x – 5) (x2 – x–6) are

(a) –2, 3, 5 (b) –2, –3, –5

(c) 2, –3, –5 (d) 2, 3, 5

13. Graph of y = ax2 + bx + c intersects x-axis at 2 distinct points if

(a) b2 –4ac > 0 (b) b2 – 4ac < 0

(c) b2 –4ac = 0 (d) none

SHORT ANSWER TYPE QUESTIONS

14. If and are the zeroes of the polynomial 2x2 – 7x + 3. Find the sumof the reciprocal of its zeros.

15. If are the zeroes of the polynomial p(x) = x2 – a (x + 1) – b such that( + 1) ( + 1) = 0 then find value of b.

16. If are the zeroes of the polynomial x2 – (k + 6) x + 2 (2k – 1). Find

k if 1

.2

17. If (x + p) is a factor of the polynomial 2x2 + 2px + 5x + 10 find p.

18. Find a quadratic polynomial whose zeroes are 5 3 2 and 5 3 2 .

19. If 1and – 2

5 are respectively product and sum of the zeroes of a quadratic

polynomial. Find the polynomial.

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20. If one of the zero of the polynomial

g(x) = (k2 + 4) x2 + 13x + 4k is recoprocal of the other, find k.

21. If be the zeroes of the quadratic polynomial 2 – 3x – x2 then find thevalue of + (1 + ).

22. Form a quadratic polynomial, one of whose zero is 2 5 and thesum of zeroes is 4.

23. If sum of the zeroes of kx2 + 3k + 2x is equal to their product. Find k.

24. If one zero of 4x2 – 9 – 8kx is negative of the other, find k.

LONG ANSWER TYPE QUESTIONS

25. Find the quadratic polynomial whose zeroes are 2 and –3. Verify therelation between the coefficients and the zeroes of the polynomial.

26. If one zero of the polynomial (a2 + a) x2 + 13x + 6a is reciprocal of theother, find value (s) of a.

27. –5 is one of the zeroes of 2x2 + px – 15. Quadratic polynomialp(x2 + x) + k has both the zeroes equal to each other. Then find k.

28. What should be subtracted from the polynomial 2x3 + 5x2 – 14x + 10 sothat the resultant polynomial is a multiple of (2x – 3).

29. If f(x) = 2x4 – 5x3 + x2 + 3x – 2 is divided by g(x), the quotient isq(x) = 2x2 – 5x + 3 and r(x) = – 2x + 1 find g(x).

30. If (x – 2) is one of the factors of x3 – 3x2 – 4x + 12, find the other zeroes.

31. If and are the zeroes of the polynomial x2 – 5x + k such that – = 1, find the value of k.

32. If are zeroes of quadratic polynomial 2x2 + 5x + k, find the value of

k, such that ( )2 – =214 .

33. Obtain all zeroes of x4 – x3 –7x2 + x + 6 if 3 and 1 are zeroes.

34. If the two zeroes of the polynomial 2x4 – 2x3 – px2 + qx – 6 are –1 and2, find p and q.

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35. If 2 3 and 2 3 are two zeroes of x4 – 4x3 – 8x2 + 36x – 9

find the other two zeroes.

36. What must be subtracted from 8x4 + 14x3 – 2x2 + 7x – 8 so that theresulting polynomial is exactly divisible by 4x2 + 3x – 2.

37. When we add p(x) to 4x4 + 2x3 – 2x2 + x – 1 the resulting polynomial isdivisible by x2 + 2x – 3 find p(x).

38. Find a and f if (x4 + x3 + 8x2 + ax + f) is a multiple of (x2 + 1).

39. If the polynomial 6x4 + 8x3 + 17x2 + 21x + 7 is divided by 3x2 + 1 + 4xthen r(x) = (ax + b) find a and b.

40. Obtain all the zeroes of 2x4 – 2x3 – 7x2 + 3x + 6 if

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x are two

factors of this polynomial.

41. If (x3 – 3x + 1) is one of the factors of the polynomial x5 – 4x3 + x2 + 3x– 1, find the other two factors.

42. What does the graph of the polynomial ax2 + bx + c represents. Whattype of graph will it represent (i) for a > 0, (ii) for a < 0. What happensif a = 0?

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(i) in the presence of oxygen (ii) in the absence of oxygen.

4. Write the difference between inhalation and exhalation.

5. List the three events which occur during photo synthesis.

10. What is the structural and functional unit of kidney called?

2. What will happen to a plant if the xylem is removed?

3. What is the role of saliva in the digestion of food?

4. Name the tissue that transports water and minerals in plants.

5. What is the role of acid in our stomach?

6. What is emulsification?

7. Name the cell organelle in which photosynthesis occur.

8. Name the largest artery in the human body.

9. Define transpiration

Very Short Answers (1 Mark)

Short Answers (2 Marks or 3 Marks)

1. How is small intestine designed to absorb digested food?

2. What are stomata? Draw a labelled diagram of stomata.

3. Write the equation for the process of breakdown of glucose in a cell

1. State one difference between autotrophic and heterotrophic mode of

nutrition.

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Long Answers (5 Marks)

Short Answer (3 Marks)

1. Describe the process of double circulation in human beings.

2. What are the methods used by plants to get rid of their waste products?

6. How does transpiration helps in upward transport of substances.

7. Write the functions of the components of blood.

8. Why is small intestine longer in herbivores than in carnivores?

9. Why muscles cramps occur after heavy physical exercise?

10. Why a person with haemoglobin count 7g/dL (below normal range)

suffers from breathing problems?

3. (i) State the role of vales present in heart.

(ii) Why it is necessary to separate oxygenated and deoxygenated

blood in mammals and birds?

(ii) Veins are thin walled blood vessels

4. Give reason for the following :

(i) Arteries are thick walled blood cessels.

(iii) Veins have valves in them.

1. Explain the process of digestion of food in mouth stomach and small

intestine in human body. Draw a well labelled diagram of human

digestive system.

2. Draw a diagram showing Human Respiratory system. Label the

following parts

3. Draw a well diagram of nephron.

(i) Larynx (ii) Trachea

(iii) Bronchus (iv) Lungs

Explain the mechanism of urine formation in man.

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