[Evergreen Question Bank in Science-10][204]

1. On reacting the compound of calcium X with water, compound Y is obtained. Y on boiling with NH4Cl, a gas

Z is obtained. X, Y and Z respectively are :

(A) CaCO3, CaO, NH3 (B) CaCO3, CaO, Cl2

(C) CaO, CaCl2, Cl2 (D) CaO, Ca(OH)2, NH32.

What does the above figure represents :

(A) Correct way of heating the boiling tube containing crystals of ferrous sulphate and of smelling the odour.

(B) The green coloured crystals of ferrous sulphate changes to brownish black ferric oxide with the evolution

of sulphur dioxide and sulphur trioxide.

(C) 2 3 2 3Ferric oxide Sulphur SulphurFerrous sulphate

(Brownish black) dioxide trioxide (Green colour)

2FeSO ( ) Fe O ( ) + SO ( )+ SO ( )4 s s g g

(D) All of the above are correct.

3.

SECTION - A

[Section – A consists of 24 questions. Attempt any 20 questions from this section.]

The first attempted 20 questions would be evaluated.

SAMPLE QUESTION PAPER-4

Subject : Science

Class-10

TERM-ITime : 90 minutes Maximum Marks : 40

General Instructions :

Same as in Sample Question Paper-1

Strong Base

Weak Acid

Basic Salt Water

[205][Evergreen Question Bank in Science-10]

Which of the following two combinations are correct ?

Salt Nature

(i) NH4Cl Basic

(ii) NaHCO3 Basic

(iii) KHCO3 Acidic

(iv) K2CO3 Basic

(A) (ii) and (iii) (B) (i) and (iii)

(C) (i) and (iv) (D) (ii) and (iv)

4. Which of the following represents a balanced chemical equation ?

(A) 3NH3 + 3NO2 + 4H2O

(B) 4NH3 + 5O2 4NO2 + 6H2O

(C) 2NH3 + 3O2 2NO2 + 3H2O

(D) 5NH3 + 6O2 5NO2 + 6H2O

5. The graph given below depicts a neutralization reaction (acid + alkali salt + water). The pH of a solutionchanges as we add excess of acid to an alkali.

Which letter denotes the area of the graph where only acid is present ?(A) A (B) B(C) C (D) D

6. In the reaction of zinc with copper sulphate solution.Zn(s) + CuSO4(aq) ZnSO4(aq) + Cu(s)Which option in the given table correctly represents the substance oxidised and the substance reduced.

Option Substance oxidised Substance reduced

A Zn ZnSO4

B CuSO4 ZnSO4

C Zn CuSO4

D CuSO4 Cu

7. Match column A with column B and choose the correct option :

Column A Column B

A. Butyric acid (i) Tomatoes

B. Malic acid (ii) Rancid butter

C. Oxalic acid (iii) Apple

D. Stearic acid (iv) Fats

[Evergreen Question Bank in Science-10][206]

A B C D

(A) (i) (ii) (iii) (iv)

(B) (iii) (i) (iv) (ii)

(C) (ii) (iii) (i) (iv)

(D) (iv) (iii) (ii) (i)

8. An element ‘X’ forms two oxides ‘XO’ and ‘XO2’. The oxide ‘XO’ is neutral but ‘XO2’ is acidic in nature. The

element ‘X’ is :

(A) sulphur (B) calcium

(C) hydrogen (D) carbon

9. Identify the wrong statement in the following.

(A) Sodium benzoate is used as food preservative.

(B) Sulphuric acid is called as the ‘King of Chemicals’.

(C) The pH of acid is equal to 7.

(D) Curd contains lactic acid.

10. Choose the incorect statement :

(A) Iodine value is a parameter to denote the degree of unsaturation of fatty acids

(B) Cholesterol is not present in plant fats

(C) Rancidity is a reduction process of oily food materials

(D) Tocopherol is an antioxidant.

11. Carefully study the diagram of the human excretory system with labels (i), (ii),

(iii) and (iv). Select the option which gives correct identification and main

function and/or characteristic.

(A) (i) Left renal artery : Takes blood from kidney to vena cava

(B) (ii) Left ureter : Stores urine

(C) (iii) Urinary bladder : Stores urine

(D) (iv) Urethra : Stores urine

12. Which one of the following is the function of the enzymes of pancreatic juice ?

(A) Trypsin digests protein and lipase digests carbohydrates.

(B) Trypsin digests emulsified fats and lipase digests proteins.

(C) Trypsin and lipase digest fats.

(D) Trypsin digests proteins and lipase digests emulsified fats.

13. In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts

of the body ?

(A) Pisces and amphibians (B) Amphibians and reptiles

(C) Amphibians only (D) Pisces only

14. Which of the following is most appropriate for aerobic respiration ?

(A) cytoplasmmitochondria

2 2Glucose Pyruvate CO + H O + Energy

(B) mitochondriacytoplasm

2 2Glucose Pyruvate CO + H O + Energy

(C) mitochondriacytoplasm

2 2Glucose Pyruvate + Energy CO + H O

(D) mitochondriacytoplasm

2 2Glucose Pyruvate + Energy CO + H O + Energy

[207][Evergreen Question Bank in Science-10]

15. Observe the diagram of Human digestive system.

Match the labelling referred in column I and correlate with the function in column II :

Column I Column II

(i) (a) Produces bile

(ii) (b) Produces pancreatic juice

(iii) (c) Food is mixed with intestinal juice and

complete digestion takes place.

(iv) (d) stores bile

(A) (i)—(d), (ii) (a) , (iii) (b), (iv)—(c)

(B) (i)—(a), (ii) (a) , (iii) (b), (iv)—(c)

(C) (i)—(d), (ii) (b) , (iii) (a), (iv)—(c)

(D) (i)—(b), (ii) (a) , (iii) (d), (iv)—(c)

16. Match the correct part which describes the breathing mechanism during exhalation process :

Column I Column II

(Part of respiratory system) (Event occurring during exhalation process)

(i) Diaphragm (a) Move downwards and inwards

(ii) Intercostal muscles (b) Relaxes and rises up, back into its dome shape

(iii) Ribs (c) Deflate

(iv) Lungs (d) Relax

(A) (i)—(b), (ii) (a) , (iii) (d), (iv)—(c)

(B) (i)—(c), (ii) (d) , (iii) (a), (iv)—(b)

(C) (i)—(b), (ii) (d) , (iii) (a), (iv)—(c)

(D) (i)—(d), (ii) (b) , (iii) (c), (iv)—(a)

[Evergreen Question Bank in Science-10][208]

17. Centre of curvature is not a part of the spherical mirror rather it lies……………...the mirror.

(A) on the boundary of (B) inside

(C) outside (D) none of these

18. Analyse the following observation table showing variation of image distance (v) with object distance (u) incase of a convex lens.

S.No. Object distance u (cm) Image distance v (cm)

a – 30 + 30

b – 20 + 60

c – 18 + 90

d – 10 + 100

Identify the incorrect observation?

(A) a (B) b

(C) c (D) d

19. A beam of light is incident through holes on side A and emerges out of the holes on the other face of the box asshown in the figure.

Which of the following could be inside the box?

(A) Concave lens (B) Convex lens

(C) Prism (D) Rectangular glass plate

20. A ray of light enters from medium A to medium B as shown in the figure.

The refractive index n of medium B relative of medium A will be :

(A) n > 1 (B) n < 1

(C) n = 1 (D) n = 0

21. White light is incident on one surface of a triangular piece of glass. Which colour of light deviates the mostfrom the original path after leaving the glass?

(A) Red (B) Orange

(C) Green (D) Violet

22. Find the angle of incidence and angle of reflection from the diagram :

(A) 45°, 40° (B) 55°, 55°

(C) 60°, 60° (D) 30°, 30°

[209][Evergreen Question Bank in Science-10]

23. Which of the following ray diagrams is correct for the ray of light incident on a concave mirror as shown in

figure?

(A) (B)

(C) (D)

24. Two identical prisms PQR and P’Q’R’ are given. White light is passed through PQR as shown below.

Which of the following position of P’Q’R’ will again yield white light?

(A) (B) (C) (D)

C FP

[Evergreen Question Bank in Science-10][210]

SECTION - B

[Section - B consists of 24 questions (SI. No. 25 to 48). Attempt any 20 questions from this section.]

The first attempted 20 questions would be evaluated.

25. 2 Z2 2

Step1 Step2 Step3

+CO +COCaO + H O X + Heat Y

Identify the correct option from the given table which gives the correct formula of X, Y and Z.

Option Formula of X Formula of Y Formula of Z

A CaO CaCO3 Ca(HCO3)2

B Ca(OH)2 CaCO3 Ca(HCO3)2

C CaCO3 Ca(OH)2 Ca(HCO3)2

D Ca(HCO3)2 CaCO3 Ca(OH)2

26. When you place an iron nail in copper sulphate solution, the reddish brown coating formed as the nail is :

(A) soft and dull (B) hard and flaky

(C) smooth and shining (D) rough and granular

27. When you place an iron strip in the solution of copper sulphate, the time required for the colour of the solution

to change from blue to green is about :

(A) a second (B) an hour

(C) 8 hours (D) 24 hours

28. Four experimental set-up are shown below. A rapid evolution of H2 gas will be observed in which set-up ?

(A) (B)

(C) (D)

29. Acid rain occurs, when pH value of rainwater is less than :

(A) 6.5 (B) 5.6

(C) 7.2 (D) 2.7

[211][Evergreen Question Bank in Science-10]

30. Match the column A with Column B and choose the correct option :

Column A Column B

A. Epsom salt (i) Na2SO4.10H2O

B. Glauber’s salt (ii) KNO3

C. White vitriol (iii) MgSO4

D. Nitre (iv) ZnSO4

A B C D

(A) (iii) (i) (iv) (ii)

(B) (i) (iii) (iv) (ii)

(C) (iv) (iii) (ii) (i)

(D) (i) (ii) (iii) (iv)

Questions No. 31 to 34 consist of two statements – Assertion (A) and Reason (R). Answer these questions selecting

the appropriate option given below :

(A) Both A and R are true and R is the correct explanation of A.

(B) Both A and R are true and R is not the correct explanation of A.

(C) A is true but R is false.

(D) A is false but R is true.

31. Assertion (A) : CuO(s) + H2(g) Cu(s) + H2O(l). It represents a redox reaction.

Reason (R) : In this reaction CuO is getting oxidised while H2 is getting reduce.

32. Assertion (A) : The strength of an acid or an alkali can be tested by using a scale called the pH scale (0-14)

which gives the measure of hydrogen ion concentration in a solution.

Reason (R) : A neutral solution has a pH of exactly 7, while an acidic solution has a pH less than 7 and a basic

solution of pH more than 7.

33. Assertion (A) : The colour of blood is red.

Reason (R) : It is due to oxidation of haemoglobin with oxygen.

34. Assertion (A) : Danger signals are made of red colour.

Reason (R) : Velocity of red light in air is maximum, so signals are visible even in dark.

35. A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper

yellowish orange.Which of the following would change the colour of this pH paper to greenish-blue ?

(A) Lemon Juice (B) Vinegar

(C) Common salt (D) An antacid

36. The source of oxygen released during photosynthesis is :

(A) carbon dioxide (B) water

(C) glucose (D) chlorophyll

37. The autotrophic mode of nutrition requires :

(A) carbon dioxide and water (B) chlorophyll

(C) sunlight (D) all of these

38. The breakdown of pyruvate to give carbon dioxide, water and energy takes place in :

(A) cytoplasm (B) mitochondria

(C) chloroplast (D) nucleolus

39. Two lenses of power + 2.50 D and -3.75 D are combined to form a compound lens. The focal length of the new

lens is :

(A) 40 cm (B) – 40 cm

(C) 80 cm (D) –80 cm

[Evergreen Question Bank in Science-10][212]

40. A child is standing in front of a magic mirror. She finds the image of her head bigger, the middle portion of her

body of the same size and that of the legs smaller.The following is the order of combinations for the magic

mirror from the top.

(A) Plane, convex and concave (B) Convex, concave and plane

(C) Concave, plane and convex (D) Convex, plane and concave

41. Which one of the following is a type of nutrition in Amoeba ?

(A) Holozoic (B) Autotrophic

(C) Parasitic (D) Saprophytic

42. In our body which organ is responsible for conversion of ammonia into urea ?

(A) Kidney (B) Lungs

(C) Liver (D) Heart

43. A virtual image three times the size of the object is obtained with a concave mirror of radius of curvature 36 cm.

The distance of object from the mirror is :

(A) 5 cm (B) 10 cm

(C) 12 cm (D) 20 cm

44. While looking at the above diagram, Rhea concluded the following :

(i) The image of the object will be a real and magnified.

(ii) The image will be formed beyond C.

(iii) The image of the object will be inverted.

(iv) This is a concave mirror and hence the focal length will be negative.

Which one of the above statements are correct?

(A) (i) and (ii) (B) (i) and (iii)

(C) (ii), (iii) and (iv) (D) (i), (ii), (iii) and (iv)

45. A pencil when dipped in water in a glass, appears to be bent. This is due to;

(A) reflection of light (B) scattering of light

(C) refraction of light (D) dispersion of light

46. An object is placed 20.0 cm in front of a concave mirror whose focal length is 25.0 cm. What is the magnification

of the object?

(A) +5.0 (B) – 5 0

(C) +2.0 (D) – 2.0

47. The refractive index of a denser medium with respect to rarer medium is 5

4 then the refractive index of rarer

medium with respect to denser medium will be

(A)5

4(B)

5

2

(C)2

5(D)

4

5

48. Consider the following statement :

Nitrogen is an essential constituent of

(i) soil (ii) animal (iii) Plant

Which of the statements given above is/are correct ?

(A) (iii) Only (B) (i) and (iii) only

(C) (i) and (ii) only (D) (i), (ii) and (iii)

[213][Evergreen Question Bank in Science-10]

SECTION - C

[Section- C consists of three Cases followed by questions. There are a total of 12 questions in this section. Attempt any

10 questions from this section.]

The first attempted 10 questions would be evaluated.

Case :In everyday life, pH plays an important role on daily basis like in gardening and farming. The best crops are usuallyobtained with neutral or slightly acidic soil (pH 6.5 to 7.0). Tooth decay starts when the pH of mouth is lower than5.5. Bee-sting leaves an acid which causes pain and irritation etc.

49. Three unknown solution A, B and C are given with pH value 6, 8 & 9.5. Which solution will contain maximumOH–ion ?(A) A (B) B(C) C (D) None of these

50. In which of the following field pH scale is important for measurement ?(A) Medicine (B) Forestry(C) Food Science (D) All of the above

51. What is the pH value of saliva after meal ?(A) 4.8 (B) 6.8(C) 5.8 (D) less than 4

52. Which of the following substance is added by farmers if the soil is acidic ?(A) common salt (B) limestone(C) vinegar (D) slaked lime

Case :The alimentary canal is a long tube extending from the mouth to the anus. Saliva secreted by salivary glands makesthe food soft since the lining of the canal is soft. Saliva contains an enzyme salivary amylase that breaks downstarch which is a complex molecule to give sugar. The lining of canal has muscles that contract rhythmically topush the food forward. Such movements are called peristaltic movements and occur all along the gut. The food istaken to the stomach through the food-pipe (oesophagus). The gastric glands present in the wall of the stomachrelease hydrochloric acid, a protein digesting enzyme called pepsin and mucus. The hydrochloric acid creates anacidic medium which facilitates the action of the enzyme pepsin. From the stomach, the food enters the smallintestine which is the longest part of alimentary canal but it is fitted into a compact space due to extensive coiling.The excretory system of humans includes the following parts:

(i) A pair of Kidney : Kidneys contain nephrons which are the filtering units(ii) A pair of ureter : Ureters connect kidneys with the urinary bladder and transport urine from kidneys

(iii) A urinary bladder : Urine is stored in the urinary bladder(iv) A urethra : It is a duct which takes urine from the bladder to the exterior

Structure of a nephron : It has a tubular structure whose one end is cup-shaped (called Bowman’s capsule)containing cluster of capillaries and inside the cavity of Bowman’s capsule is blood plasma without any bloodproteins. This cup-shaped structure collects the filtered urine. The structure formed by the cluster of capillaries iscalled glomerulus. In the glomerulus, ultrafiltration takes place. This glomerulus is followed by tubular part andcollecting duct where selective reabsorption of glucose, amino acids, salts and a major amount of water takes place.The remaining liquid part left in the collecting duct constitutes the urine.

53. If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected ?(A) Proteins break down into amino acids(B) Starch break down into sugars(C) Fats break down into fatty acids and glycerol(D) Absorption of vitamins

54. Movement of blood through the oesophagus is due to :(A) lubrication by saliva (B) peristalsis(C) gravitational pull (D) all of these

55. The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correctone :(A) Pepsin (B) Mucus(C) Salivary amylase (D) Bile

[Evergreen Question Bank in Science-10][214]

56. Choose the correct path of urine in our body :(A) Kidney ureter urethra urinary bladder(B) Kidney urinary bladder urethra ureter(C) Kidney ureter urinary bladder urethra(D) Urinarybladder kidney ureter urethra

Case :Refraction explains some strange effects, which you may have already noticed. When viewed obliquely, the bottomof the swimming pool, for example, always looks closer to the surface than it really is. Similarly, a fish near thebottom of a river or a pond is always deeper than it seems. Light reflected from the fish travels through the watertowards you. As it passes from the water into the air, it refracts away from the normal because it has travelled froma denser medium (water) into a less dense medium (air). The light entering your eye from a certain point on the fishappears to come from a higher point. Your eye sees the fish higher up than it really is. The apparent depth is lessthan the real depth.

57. A ray of light passes from air into water. The angle of refraction will be :(A) equal to the angle of incidence (B) greater than the angle of incidence(C) smaller than the angle of incidence (D) 45°

58. A ray of light passes from a medium A to another medium B. No bending of light occurs if the ray of light hitsthe boundary of medium B at an angle of :(A) 30° (B) 60°(C) 90° (D) 120°

59. Refractive indices of water, sulphuric acid, glass and carbon dioxide are 1.33, 1.43, 1.53 and 1.63 respectively.In which of these media a ray of light incident obliquely at same angle of incidence would bend the most?(A) Water (B) Glass(C) Carbon dioxide (D) Sulphuric acid

60. The path of a ray light coming from air passing through a rectangular glass slab traced by four students areshown as A, B, C and D in figure.The correct diagram is :

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(A) A (B) B (C) C (D) D

[215][Evergreen Question Bank in Science-10]