PODAR INTERNATIONAL SCHOOL Periodic Test 2 (2021- 22) 1. 2 ...

CB/X/2122 Periodic Test 2 of 26

General Instructions:

1. The Question Paper contains three sections.

2. Section A has 24 questions. Attempt any 20 questions.

3. Section B has 24 questions. Attempt any 20 questions.

4. Section C has 12 questions. Attempt any 10 questions.

5. All questions carry equal marks.

6. There is no negative marking.

7. Writing Time: 90 minutes

PODAR INTERNATIONAL SCHOOL

Periodic Test 2 (2021-22)

Grade: X Subject: Science

Total Marks: 40 Duration: 90 minutes


SECTION – A

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

The first attempted 20 questions would be evaluated.

1. Five drops of calcium hydroxide were taken on a watch glass and they were tested with

red litmus indicator.

Which of the following may be observed after the activity?

A. Red litmus turns pink

B. Red litmus turns blue

C. Red litmus turns green

D. The colour of red litmus does not change

2. A new product sodium zincate will be formed if sulphuric acid is replaced with

_______________ in the given experiment.

A. Sodium hydroxide

B. Sodium oxide

C. Zinc oxide

D. Water


3. During the preparation of hydrogen chloride gas on a humid day, the gas is usually

passed through a guard tube containing calcium chloride.

The role of calcium chloride taken in the guard tube is to:

A. absorb the evolved gas

B. moisten the gas

C. absorb moisture from the gas

D. absorb Cl- ions from the evolved gas

4. Rohan found that 20 mL of a solution of NaOH found to be completely neutralised by 16

mL of a given solution of HCl.

If Rohan takes 10 mL of the same solution of NaOH, the amount HCl solution (the same

solution as before) required to neutralise it will be:

A. 5 mL

B. 8 mL

C. 12 mL

D. 32 mL

5. Which one of the following can be used as an acid based indicator by a visually impaired

student?

I- Turmeric

II- Vanilla Essence

III- Methyl Orange

A. Only I

B. Only II

C. Only III

D. Both II and III

20 ml NaOH 16 ml HCl NaCl +H2O


6. The formula of Lithium chloride is LiCl. This is an ionic compound. It is used as a desiccant

for drying air streams

The statement which best describes this ionic compound is:

I- It has high melting and boiling points.

II- It not soluble in water.

III- It does not show electrical conductivity in solid state.

A. Only I

B. Only II

C. Both I and III

D. Both II and III

7. Amphoteric oxides are:

A. metal oxides which do not react with acids but react with bases

B. metal oxides which react with both acids as well as bases

C. metal oxides which react with acids but do not react with bases

D. metal oxides which show no reaction with either acids or bases

8. Which of the following rows correctly depicts the property of metal potassium?

Option Can be cut with a knife Low density

A. No Yes

B. Yes Yes

C. Yes No

D. No No


9. The universal indicator, which is a mixture of several indicators, shows a colour change in

a solution, which helps us to interpret how acidic or basic a solution is.

The universal indicator shows different colours at different concentrations of hydrogen

ions in a solution.

Water is a neutral substance. Few drops of universal indicator were added to each test

tube.

Four test-tubes containing solutions are shown along with colours.

Water is contained in _______.

A. I

B. II

C. III

D. IV

10. Bleaching powder is used as an oxidising agent in many chemical industries and for

disinfecting drinking water to make it free of germs.

Chlorine gas is used for the manufacture of bleaching powder.

Bleaching powder is produced by the action of chlorine on:

A. lime water

B. dry slaked lime

C. chalk

D. nitric acid


11. Carefully study the diagram of the human respiratory system with labels A, B, C and D.

Select the option which gives correct identification and main function and /or

characteristic.

A. P - Nostril/ nasal cavity: ensures that the air-passage does not collapse

B. Q - Rings of cartilage: have fine hair to filter the passing air

C. R - Diaphragm : it flattens when we breathe in

D. S - Ribs: they are lifted when we breathe out


12. The diagram represents a part of the human circulatory system. Where is the blood

pressure highest?

A. P

B. Q

C. R

D. S

13. Which of the following option correctly represents the pathway of urine starting from the

organ of its formation?

A. Kidney Ureter Urinary bladder Urethra

B. Kidney Urinary bladder Urethra Ureter

C. Urethra Kidney Ureter Urinary bladder

D. Urinary bladder Kidney Ureter Urethra


14. A plant is kept in the dark for two days.

A leaf from this plant is used in an experiment to investigate the effect of two factors on

photosynthesis as shown in the diagram.

Identify the correct match.

A. P-Blue/black, R-Brown

B. P-Brown, R-Brown

C. P-Blue/black, R-Blue/black

D. P-Brown, R-Blue/black


15. Identify the processes labelled as X and Y in the flowchart given below.

A. X- mitochondria and Y- cytoplasm

B. X- cytoplasm and Y- cytoplasm

C. X- cytoplasm and Y- mitochondria

D. X- mitochondria and Y- mitochondria

Y


16. Observe the diagram of the Human digestive system.

Match the labelling in column I to the function in column II.

Column I Column II

i. a. contains hydrochloric acid

ii. b. indigestible food is egested

iii. c. produces bile

iv. d. complete digestion of carbohydrates, proteins and fats

A. i - (d) ; ii – (a) ; iii – (a) ; iv – (b)

B. i - (c) ; ii – (b) ; iii – (d) ; iv – (a)

C. i - (c) ; ii – (a) ; iii – (d) ; iv – (b)

D. i - (a) ; ii – (b) ; iii – (d) ; iv – (b)


17. Twinkling of stars is due to atmospheric:

A. Dispersion of light by water droplets

B. Refraction of light by different layers of varying refractive indices.

C. Scattering of light by dust particles.

D. Internal reflection of light by clouds

18. Which of the following ray diagrams is correct for a ray of light incident on the lens shown

in the figure?

A.

B.

C.

D.

19. Which of the following lenses would you prefer to use while reading small letters found in

a dictionary?

A. A convex lens of focal length 50 cm

B. A concave lens of focal length 50 cm

C. A convex lens of focal length 5 cm

D. A concave lens of focal length 5 cm


20. The refractive indices of glass and water with respect to air are 32 and

43 respectively. If

speed of light in glass is 2 × 108 m/s, find the speed of light in water.

A. 2.25 × 108 𝑚/𝑠 B. 1.77 × 108 𝑚/𝑠 C. 6 × 108 𝑚/𝑠 D. 1 × 108 𝑚/𝑠

21. Under which of the following conditions will a convex mirror of focal length (f) produce an

image that is erect, diminished and virtual.

i. When the object is between pole of the mirror and focal length of the mirror

ii. When the object is at infinity

iii. When the object is between infinity and the pole of the mirror

A. Only i and iii

B. Only i and ii

C. Only ii and iii

D. i, ii and iii

22. A 6 cm tall object is placed perpendicular to the principal axis of a convex lens of focal

length 24 cm at a distance of 12 cm from it. At what distance will the image of the object

form?

A. - 24 cm

B. - 12 cm

C. - 36 cm

D. 8 cm


23. Which of the following correctly represents the graphical relation between angle of

incidence (i) and angle of reflection (r)?

A.

B.

C.

D.

24. Two identical prisms P1 and P2 are placed in such a way that the second prism is placed in

an inverted position with respect to the first prism. What will be observed on the screen?

A. Red, blue and green lights

B. Only white light

C. No light

D. A spectrum


SECTION - B

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


25.

Identify the correct option from the given table which represents the type of colour that

will be observed after step 1 and step 2.

Colour X Colour Y

A. Blue White

B. White Blue

C. Green Blue

D. Blue Green


26. Orchids grow best if the soil has pH between5.5 to 6.5. An orchid grower tested various

soils. The chart shows the results.

Which soil is best for the healthy growth of orchids?

A. P

B. Q

C. R

D. S

27. A dry pellet of a common base B when kept in the open absorbs moisture and turns

sticky. The compound is also a by-product of the chloro-alkali process.

Identify B:

A. Sodium chloride

B. Sodium hydroxide

C. Carbon dioxide

D. Sodium carbonate


28. Which of the following can be taken to get relief from acidity?

OPTION Sour milk Lemon juice Milk of magnesia

A. × ×

B. × ×

C. × ×

D. ×

29. An acid (X) with sodium hydrogen carbonate is used in making cakes fluffy and spongy.

It is due to the release of (Y) gas in the reaction. Here, X and Y are:

A. X: Acetic acid, Y: CO2

B. X: Tartaric acid, Y: O2

C. X: Acetic acid, Y: O2

D. X: Tartaric acid, Y: CO2

30. Which of the following statement is true if alcohol is replaced with NaOH solution?

A. Bulb glows in alcohol but not in NaOH solution

B. Bulb glows in NaOH solution but not in alcohol

C. Bulb does not glow in alcohol and neither will it glow in NaOH solution

D. Bulb glows in both NaOHsolution as well as in alcohol.


Question 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: Plaster of Paris is used by doctors for setting fractured bones.

Reason: When Plaster of Paris is mixed with water and applied around the fractured limbs,

it sets into a hard mass.

32. Assertion: When a piece of copper metal is added to dilute hydrochloric acid, the

solution turns black.

Reason: Copper reacts with dilute hydrochloric acid to form copper (II) chloride solution.

33. Assertion: Herbivores have a shorter small intestine.

Reason: The small intestines of herbivores are adapted to allow the cellulose to be

digested.

34. Assertion: Danger signals are made of red colour.

Reason: Red colour is least scattered by fog or smoke and can be seen at a distance.

35. Which of the following can be obtained by using sodium chloride as raw material?

Bleaching power Washing soda

A.

B.

C.

D.


36. Which of the following equations is the summary of photosynthesis?

A. 6CO2 + 12H2O → C6H12O6 + 6O2 + 6H2O

B. 6CO2 + H2O + Sunlight → O2 + 6H2O

C. 6CO2 + 12H2O 𝐶ℎ𝑙𝑜𝑟𝑜𝑝ℎ𝑦𝑙𝑙→ 𝑆𝑢𝑛𝑙𝑖𝑔ℎ𝑡 C6H12O6 + 6CO2 + 6H2O2

D. 6CO2 + 12H2O 𝐶ℎ𝑙𝑜𝑟𝑜𝑝ℎ𝑦𝑙𝑙→ 𝑆𝑢𝑛𝑙𝑖𝑔ℎ𝑡 C6H12O6 + 6CO2 + 6H2O

37. How is this process advantageous for Amoeba?

A. Capturing of food takes less time

B. Complex food can be digested easily

C. More amount of food can be consumed

D. Fast distribution of nutrition within the body


38. Which function does not occur in the kidneys?

A. removal of carbon dioxide

B. removal of excess salts from the blood

C. removal of excess water from the blood

D. removal of urea from the blood

39. The focal length of a concave mirror is (f) and the distance of the object from the principal

focus is (a). The magnitude of magnification obtained will be:

A. (f + a)f

B. fa C. √f√a D. f2a2

40. An object is placed at 36.0 cm in front of a concave mirror of focal length 12.0 cm. At what

distance from the mirror should a screen be placed in order to obtain a sharp

image?What is the nature of the image?

A. - 18 cm; real image

B. - 12 cm; virtual image

C. - 3 cm; real image

D. - 6 cm; real image

41. Which of the following events in the mouth cavity will be affected if salivary amylase is

lacking in the saliva?

A. Starch breaking down into sugars

B. Proteins breaking down into amino acids

C. Absorption of vitamins

D. Fats breaking down into fatty acids and glycerol


42. In a person the gall bladder is removed from the body. What will its effect?

A. Secretion of amino acids will be affected

B. Secretion of bile will be affected

C. Secretion of trypsin will be affected

D. Secretion of lipase will be affected

43. A lens of focal power 0.5 D is:

A. A convex lens of focal length 0.5 m

B. A concave lens of focal length 0.5 m

C. A convex lens of focal length 2 m

D. A concave lens of focal length 2 m

44. While looking at the diagram given below, a student concluded the following:

i. The image of the object will be real.

ii. The image of the object will be inverted.

iii. The image of the object will be of the same size as the object.

Which one of the above statements are correct?

A. Only i and iii

B. Only i and ii

C. Only ii and iii

D. i, ii and iii


45. A 3.0 cm tall object is placed perpendicular to the principal axis of a convex lens of focal

length 10 cm. The distance of the object from the lens is 15 cm. Find the height of the

image.

A. - 4 cm

B. - 6 cm

C. - 2 cm

D. - 1.5 cm

46. Why does a clear sky appear blue?

A. Blue light gets absorbed by the atmosphere

B. Ultraviolet radiations are absorbed by the atmosphere

C. Violet and blue light are scattered more than light of all other colours by the

atmosphere

D. Light of all other colours is scattered more than violet and blue colour light by the

atmosphere

47. L1 and L2 are two lenses as shown in figure, Identify the nature of the lens.

L1 L2

A. L1 – converging , L2 – diverging

B. L1 – converging , L2 – converging

C. L1 – diverging , L2 – converging

D. L1 – diverging , L2 – diverging


48. Eric works in an ornament manufacturing unit.

Properties X Y Z

Malleable Yes No Yes

Ductile Yes No Yes

Electrical conductivity No Yes Yes

Melting point High High Low

Which of the above elements should he choose for making ornaments?

A. Only X

B. Only Y

C. Only Z

D. Both X and Y

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.


Case At present, nearly 118 elements are known and based on their properties, they are

mainly classified as metals and non-metals. Metals can also be arranged in increasing or

decreasing order based on their reactivity.

Suraj did an experiment to study the types of reaction shown by different metals when

they react with water. He took four metals E, F, G and H. He placed small pieces of the

samples separately in beakers half-filled with cold water. He then repeated the same

step by using hot water in place of cold water.

The following table shows his observations

Metal Reaction with water

E It does not react with water at all

F Reaction is less violent with cold water, does not catch fire

G It does not react with cold water but reacts with hot water

H Reacts violently with cold water,immediately catches fire


49. Identify the correct increasing order of reactivity of the metals.

A. E < F < G < H

B. E < G < F < H

C. E < G < H < F

D. H < G < F < E

50. Which of the following metals can be silver?

A. E

B. F

C. G

D. H

51. Which metal can displace ‘G’ from its salt solution?

A. E

B. F

C. H

D. Both F and H

52. Which metal is likely to be displaced by ‘G’?

A. E

B. F

C. G

D. H


Case Oxygen rich blood from the lungs comes to the thin-walled upper chamber of the

heart on the left. The left upper chamber (I) then relaxes. When chamber (I) contracts

and the blood is allowed to enter the next chamber (II), as it expands. When the

muscular left lower chamber of the heart contracts the blood is pumped out of the

body via aorta.

Deoxygenated blood reaches from the body to the upper chamber (III) on right side

of heart and it expands. When chamber (III) contracts, the corresponding lower

chamber (IV) dilates. This transfers the blood to right ventricle, which in turn pumps it

to the lungs.

53. Which of the following represents the label I, II, III and IV in the above passage?

A. I-Left atrium, II-Left ventricles, III-Right atrium, IV-Right ventricle

B. I- Right ventricle, II-Left atrium, III-Left ventricle, IV-Right atrium

C. I- Left atrium, II-Right ventricle, III-Left atrium, IV-Left ventricles

D. I- Left ventricles, II-Right atrium, III-Right ventricle, IV-Left atrium

54. Which animal does not show the type of circulatory system described in the passage?

A. parrot

B. whale

C. fish

D. human being

55. What prevents backflow of blood inside the heart during contraction?

A. Valves in the heart

B. Thick muscular walls of the ventricles

C. Thin walls of the atria

D. Septum


56. The table shows the characteristics of blood in one blood vessel of the body

Oxygen concentration Carbon dioxide concentration Pressure

high low High

Which blood vessel carries blood with these characteristics to rest of the body?

A. Aorta

B. Pulmonary vein

C. Pulmonary artery

D. Vena cava

Case A student is demonstrating the dispersion of white light by a glass prism. When

white light is incident on one refracting surface of the prism, the light splits up into

its constituent colours. She observes that when this dispersed white light falls on a

screen, a band of seven colours is seen. This band is called the spectrum of white

light. Red colour bends the least on passing through the prism and violet colour

bends the maximum on passing through the prism.


57. Which of the following gives the colours in the correct order from A to B?

A. Red, green, violet

B. Red, violet, green

C. Violet, red, green

D. Violet, green, red

58. Which colour has the maximum angle of deviation on passing through a prism?

A. Indigo

B. Orange

C. Blue

D. Yellow

59. Which of the following statement/s describe/s dispersion?

i. The bending of light as it passes from one medium to another

ii. A ray of light falls on a surface and bounces back

iii. The splitting of light into its component colours

A. only i

B. both i and ii

C. both ii and iii

D. only iii

60. When red light passes through a prism, it will:

A. Not split

B. Split into seven colours

C. Split into white colour

D. Split into many different colours

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PODAR INTERNATIONAL SCHOOL Periodic Test 2 (2021- 22) 1. 2 ...

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