Science Test Class 10

📝Science Test Class 10

Metals and Non-metals

Multiple Choice Questions

1. Which of the following property is generally not shown by metals?

(a) Electrical conduction
(b) Sonorous in nature
(c) Dullness
(d) Ductility

2. The ability of metals to be drawn into the thin wire is known as

(a) ductility

(b) malleability

(d) conductivity

3. Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

(i) Good thermal conductivity (ii) Good electrical conductivity (iii) Ductility (iv) High melting point

(a) (i) and (ii)

(b) (i) and (iii)

(d) (i) and (iv)

4. Which of the following metals exist in their native state in nature?

(i) Cu (ii) Au (iii) Zn (iv) Ag

(a) (i) and (ii)

(b) (ii) and (iii)

(d) (iii) and (iv)

5. Stainless steel is a very useful material for our life. In stainless steel, iron is mixed with

(a) Ni and Cr

(b) Cu and Cr

(d) Cu and Au

6. If copper is kept open in the air, it slowly loses its shining brown surface and gains a green coating. It is due to the formation of

(a) `CuSO_4`

(b) `CuCO_3`

(d) `CuO`

7. Generally, metals are solid in nature. Which one of the following metals is found in the liquid state at room temperature?

(a) Na

(b) Fe

(d) Hg

8. Generally, non-metals are not lustrous. Which of the following nonmetal is lustrous?

(a) Sulphur

(b) Oxygen

(d) Iodine

9. An alloy is

(a) an element

(b) a compound

(d) a heterogeneous mixture

10. An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following

(a) Mg

(b) Na

(d) Ca

11. Generally, non-metals are not conductors of electricity. Which of the following is a good conductor of electricity?

(a) Diamond

(b) Graphite

(d) Fullerene

12. Alloys are homogeneous mixtures of a metal with a metal or nonmetal. Which among the following alloys contain non-metal as one of its constituents?

(a) Brass

(b) Bronze

(d) Steel

13. Electrical wires have a coating of insulating material. The material, generally used is

(a) Sulphur

(b) Graphite

(d) All can be used

14. Although metals form basic oxides, which of the following metals form an amphoteric oxide?

(a) Na

(b) Ca

(d) Cu

15. Which of the following non-metals is a liquid?

(a) Carbon

(b) Bromine

(d) Sulphur

16. Which of the following oxide(s) of iron would be obtained on the prolonged reaction of iron with steam?

(a) `FeO`

(b) `Fe_2O_3`

(d) `Fe_2O_3` and `Fe_3O_4`

17. What happens when calcium is treated with water?

(i) It does not react with water

(ii) It reacts violently with water

(iii) It reacts less violently with water

(iv) Bubbles of hydrogen gas formed stick to the surface of calcium

(a) (i) and (iv)

(b) (ii) and (iii)

(d) (iii) and (iv)

18. Silver articles become black on prolonged exposure to air. This is due to the formation of

(a) `Ag_3N`

(b) `Ag_2O`

(d) `Ag_2S` and `Ag_3N`

19. Which among the following statements is incorrect for magnesium metal?

(a) It burns in oxygen with a dazzling white flame

(b) It reacts with cold water to form magnesium oxide and evolves hydrogen gas

(d) It reacts with steam to form magnesium hydroxide and evolves hydrogen gas

20. Which of the following is a characteristic of metals?

(a) They have one to three valence electrons

(b) They have 4 to 8 valence electrons

(d) They are capable to form anions easily

21. Which of the following metal has the highest melting point?

(a) Copper

(b) Silver

(d) Tungsten

22. Which of the following reaction shows that the given oxide is amphoteric in nature?

(a) `2Zn + O_2 overset{triangle}rightarrow 2ZnO`

(b) `ZnO + H_2SO_4 rightarrow ZnSO_4 + H_2O`

(d) (b) and (c) together

23.

(a). i and iii

(b). i and iv

(c). ii and iii

(d). ii and iv

24. A cable manufacturing unit tested a few elements on the basis of their physical properties.

(a). W, X, Y

(b). X, Y, Z

(c). W, X, Z

(d). W, X, Z

25. Which of the following pairs will give displacement reactions?

(a) `NaCl` solution and copper metal

(b) `MgCl_2` solution and aluminium metal

(d) `AgNO_3` solution and copper metal.

26. Generally metals react with acids to give salt and hydrogen gas. Which of the following acids does not give hydrogen gas on reacting with metals (except Mn and Mg)?

(a) `H_2SO_4`

(b) `HCl`

(d) All of these

27. Which of the following are not ionic compounds?

(i)` KCl`

(ii) `HCl`

(iii) CC`l_4`

(iv) `NaCl`

(a) (i) and (ii)

(b) (ii) and (iii)

(d) (i) and (iii)

28. Which one of the following properties is not generally exhibited by ionic compounds?

(a) Solubility in water

(b) Electrical conductivity in solid state

(d) Electrical conductivity in molten state

29. Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?

(i) Au

(ii) Cu

(iii) Na

(iv) K

(a) (i) and (ii)

(b) (i) and (iii)

(d) (iii) and (iv)

30. Galvanisation is a method of protecting iron from rusting by coating it with a thin layer of

(a) Gallium

(b) Aluminium

(d) Silver

31. Which of the following metals are obtained by electrolysis of their chlorides in a molten state?

(i) Na

(ii) Ca

(iii) Fe

(iv) Cu

(a) (i) and (iv)

(b) (iii) and (iv)

(d) (i) and (ii)

32. 2ml each of concentrated `HCl, HNO_3` and a mixture of concentrated HCl and concentrated `HNO_3` in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be

(a) `Al`

(b) `Au`

(d) `Pt`

33. An electrolytic cell consists of

(i) positively charged cathode

(ii) negatively charged anode

(iii) positively charged anode

(iv) negatively charged cathode

(a) (i) and (ii)

(b) (iii) and (iv)

(d) (ii) ad (iv)

34. During electrolytic refining of zinc, it gets

(a) deposited on cathode

(b) deposited on anode

(d) remains in the solution

35. Which of the following alloys contain mercury as one of its constituents?

(a) Stainless steel

(b) Alnico

(d) Zinc amalgam

36. Reaction between X and Y, forms compound Z. X loses electron and Y gains electron. Which of the following properties is not shown by Z?

(a) Has high melting point

(b) Has low melting point

(d) Occurs as solid

37. The electronic configurations of three elements X, Y and Z are X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?

(a) X is a metal

(b) Y is a metal

(d) Y is a non-metal and Z is a metal

38. Which of the following can undergo a chemical reaction?

(a) `MgSO_4 + Fe`

(b) `ZnSO_4 + Fe`

(d) `CuSO_4 + Fe`

39. Which one of the following figures correctly describes the process of electrolytic refining?

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Life Processes

Multiple Choice Questions

1. Which of the following statements about the autotrophs is incorrect?

(a) They synthesise carbohydrates from carbon dioxide and water in the presence of sunlight and chlorophyll

(b) They store carbohydrates in the form of starch

the absence of sunlight

(d) They constitute the first trophic level in food chains

2. In which of the following groups of organisms, the food material is broken down outside the body and absorbed?

(a) Mushroom, green plants, Amoeba

(b) Yeast, mushroom, bread mould

(d) Cuscuta, lice, tapeworm

3. Select the correct statement

(a) Heterotrophs do not synthesise their own food

(b) Heterotrophs utilise solar energy for photosynthesis

(d) Heterotrophs are capable of converting carbon dioxide and

water into carbohydrates

4. If salivary amylase is lacking in the saliva, which of the following events in the mouth cavity will be affected?

(a) Proteins breaking down into amino acids

(b) Starch breaking down into sugars

(d) Absorption of vitamins

5. The inner lining of stomach is protected by one of the following from hydrochloric acid. Choose the correct one

(a) Pepsin

(b) Mucus

(d) Bile

6. Which is the correct sequence of parts in the human alimentary canal?

(a) Mouth `rightarrow` stomach `rightarrow` small intestine `rightarrow` oesophagus`rightarrow` large intestine

(b) Mouth `rightarrow` oesophagus `rightarrow` stomach `rightarrow`large intestine`rightarrow` small intestine

(d) Mouth `rightarrow` oesophagus `rightarrow` stomach `rightarrow` small intestine `rightarrow` large intestine

7. Which part of the alimentary canal receives bile from the liver?

(a) Stomach

(b) Small intestine

(d) Oesophagus

8. A few drops of iodine solution were added to rice water. The solution turned blue-black in colour. This indicates that rice water contains

(a) complex proteins

(b) simple proteins

(d) starch

9. In which part of the alimentary canal food is finally digested?

(a) Stomach

(b) Mouth cavity

(d) Small intestine

10. Choose the function of the pancreatic juice from the following

(a) trypsin digests proteins and lipase carbohydrates

(b) trypsin digests emulsified fats and lipase proteins

(d) trypsin digests proteins and lipase emulsified fats

11. When air is blown from the mouth into a test tube containing lime water, the lime water turned milky due to the presence of

(a) oxygen

(b) carbon dioxide

(d) water vapour

12. The correct sequence of anaerobic reactions in yeast is

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

14. Which of the following statement(s) is (are) true about respiration?

(i) During inhalation, ribs move inward and diaphragm is raised

(ii) In the alveoli, exchange of gases takes place i.e., oxygen from alveolar air diffuses into blood and carbon dioxide from blood into alveolar air

(iii) Haemoglobin has greater affinity for carbon dioxide than oxygen

(iv) Alveoli increase surface area for exchange of gases

(a) (i) and (iv)

(b) (ii) and (iii)

(d) (ii) and (iv)

15. Which is the correct sequence of air passage during inhalation?

(a) Nostrils `rightarrow` larynx `rightarrow` pharynx `rightarrow` trachea `rightarrow` lungs

(b) Nasal passage `rightarrow` trachea `rightarrow` pharynx `rightarrow` larynx `rightarrow` alveoli

(d) Nostrils `rightarrow` pharynx `rightarrow` larynx `rightarrow` trachea `rightarrow` alveoli

16. During respiration exchange of gases take place in

(a) trachea and larynx

(b) alveoli of lungs

(d) throat and larynx

17. Which of the following statement (s) is (are) true about heart?

(i) Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs

(ii) Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs

(iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts

(iv) Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body

(a) (i)

(b) (ii)

(d) (i) and (iii)

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

(a) Valves in heart

(b) Thick muscular walls of ventricles

(d) All of the above

19. Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by

(a) Labeo, Chameleon, Salamander

(b) Hippocampus, Exocoetus, Anabas

(d) Whale, Dolphin, Turtle

20. 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

(d) Pisces only

21. Choose the correct statement that describes arteries.

(a) They have thick elastic walls, blood flows under high pressure; collect blood from different organs and bring it back to the heart

(b) They have thin walls with valves inside, blood flows under low pressure and carry blood away from the heart to various

organs of the body

(c) They have thick elastic walls, blood flows under low pressure; carry blood from the heart to various organs of the body

(d) They have thick elastic walls without valves inside, blood flows under high pressure and carry blood away from the heart to different parts of the body.

22. The filtration units of kidneys are called

(a) ureter

(b) urethra

(d) nephrons

23. Oxygen liberated during photosynthesis comes from

(a) water

(b) chlorophyll

(d) glucose

24. The blood leaving the tissues becomes richer in

(a) carbon dioxide

(b) water

(d) oxygen

25. Which of the following is an incorrect statement?

(a) Organisms grow with time

(b) Organisms must repair and maintain their structure

(d) Energy is essential for life processes

26. The internal (cellular) energy reserve in autotrophs is

(a) glycogen

(b) protein

(d) fatty acid

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

(a) `6CO_2 + 12H_2O rightarrow C_6H_12O_6 + 6O_2+ 6H_2O`

(b) `6CO_2 + H_2O +` Sunlight `rightarrow C_6H_12O_6 + O_2+ 6H_2O`

(d) `6CO_2 + 12H_2O +` Chlorophyll + Sunlight `rightarrow C_6H_12O_6 + 6CO_2+ 6H_2O`

28. Choose the event that does not occur in photosynthesis

(a) Absorption of light energy by chlorophyll

(b) Reduction of carbon dioxide to carbohydrates

(d) Conversion of light energy to chemical energy

29. The opening and closing of the stomatal pore depends upon

(a) oxygen

(b) temperature

(d) concentration of `CO_2` in stomata

30. Choose the forms in which most plants absorb nitrogen

(i) Proteins

(ii) Nitrates and Nitrites

(iii) Urea

(iv) Atmospheric nitrogen

(a) (i) and (ii)

(b) (ii) and (iii)

(d) (i) and (iv)

31. Which is the first enzyme to mix with food in the digestive tract?

(a) Pepsin

(b) Cellulase

(d) Trypsin

32. Which of the following statement(s) is (are) correct?

(i) Pyruvate can be converted into ethanol and carbon dioxide by yeast

(ii) Fermentation takes place in aerobic bacteria

(iii) Fermentation takes place in mitochondria

(iv) Fermentation is a form of anaerobic respiration

(a) (i) and (iii)

(b) (ii) and (iv)

(d) (ii) and (iii)

33. Lack of oxygen in muscles often leads to cramps among cricketers. This results due to

(a) conversion of pyruvate to ethanol

(b) conversion of pyruvate to glucose

(d) conversion of pyruvate to lactic acid

34. Choose the correct path of urine in our body

(a) kidney `rightarrow` ureter `rightarrow` urethra `rightarrow` urinary bladder

(b) kidney `rightarrow` urinary bladder `rightarrow` urethra `rightarrow` ureter

(d) urinary bladder `rightarrow` kidney `rightarrow` ureter `rightarrow` urethra

35. During deficiency of oxygen in tissues of human beings, pyruvic acid is converted into lactic acid in the

(a) cytoplasm

(b) chloroplast

(d) golgi body

36. 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). (i) Trachea: It is supported by bony rings for conducting inspired air.

(b). (ii) Ribs: When we breathe out, ribs are lifted.

(c). (iii) Alveoli: Thin-walled sac-like structures for exchange of gases.

(d). (iv) Diaphragm: It is pulled up when we breathe in.

37. Identify the option that indicates the correct enzyme that is secreted in location A, B and C.

(a). (i)-lipase, (ii)-trypsin, (iii)-pepsin

(b). (i)-amylase, (ii)-pepsin, (iii)-trypsin

(c). (i)-trypsin, (ii)-amylase, (iii)-carboxylase

(d). (i)-permease, (ii)-carboxylase, (iii)-oxidase

38. Observe the diagram of Human digestive system.

Match the labeling referred in column I and correlate with the function in column II.

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

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

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

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

39. The figure given below shows a schematic plan of blood circulation in humans with labels (i) to (iv). Identify the correct label with its functions?

A. (i) Pulmonary vein - takes impure blood from body part.

B. (ii) Pulmonary artery - takes blood from lung to heart.

C. (iii) Aorta - takes blood from heart to body parts.

D. (iv) Vena cava takes - blood from body parts to right auricle.

40. Identify the phase of circulation which is represented in the diagram of heart given below. Arrows indicate contraction of the chambers shown.

A. Blood transferred to the right ventricle and left ventricle simultaneously.

B. Blood is transferred to lungs for oxygenation and is pumped into various organs simultaneously.

C. Blood transferred to the right auricle and left auricle simultaneously.

D. Blood is received from lungs after oxygenation and is received from various organs of the body.

41. What is common between extensive network of blood vessels around walls of alveoli and in glomerulus of nephron?

A. Thick walled arteries richly supplied with blood

B. Thin walled veins poorly supplied with blood

C. Thick walled capillaries poorly supplied with blood.

D. Thin walled capillaries richly supplied with blood

42. Given below are the functions of some parts of human circulatory system. Identify the correct match.

A. Pulmonary vein – takes oxygenated blood from body partsto heart

B. Artery – takes oxygenated blood from heart to lung

C. Dorsal aorta – takes deoxygenated blood from heart to body parts

D. Vena cava – takes deoxygenated blood from body parts to right atrium

43. Identify the option that indicates the correct enzyme that is secreted in location L, M and N.L, M and N represent Mouth cavity, stomach and small intestine of the human being.

44. What happens when right and left ventricle contract during pumping of blood by human heart?

A. Blood transferred to the right ventricle and left ventricle simultaneously.

B. Blood is transferred to lungs for oxygenation and is pumped into various organs simultaneously.

C. Blood transferred to the right atrium and left atrium simultaneously.

D. Blood is received from lungs after oxygenation and is received from various organs of the body.

45. i, ii, iii and iv represent mouth cavity, liver, first part of small intestine and complete small intestine respectively of Human digestive system. Match the labeling referred in column I andcorrelate with the function in column II.

A. i.- c ; ii – d ; iii – a ; iv- d

B. i.- b ; ii – c ; iii – d ; iv- a

C. i.- a ; ii – c ; iii – d ; iv- c

D. i.- d ; ii – a ; iii – b ; iv- c

46. An incomplete equation for the digestion of starch using saliva is shown as:

Saliva + Starch (in test tube) →

What will be the likely outcome of this?

(a) Saliva will convert starch into complex fat molecules.

(b) Saliva will convert starch into complex sugar molecules.

(d) Saliva will breakdown starch into simple protein molecules.

47. A student sets up an experiment to study the role of enzymes in digestion of food.

In which test tube, the digestion of protein will occur?

(a) Test tube A as pepsin will breakdown into simple molecules.

(b) Test tube B as HCl will breakdown protein into simple molecules.

(d) Test tube B as HCl will activate pepsin for breakdown of protein into simple molecules.

48. The image shows the flow diagram for the breakdown of glucose in yeast.

Under which condition these types of products are obtained?

(a) in the presence of oxygen

(b) in the absence of oxygen

(d) in the absence of carbon dioxide

49. How water is taken up from soil to the xylem tissue of the plant roots?

(a) xylem attracts water molecules

(b) roots act as a suction pump for taking water

(d) difference in the ion concentration creates a gradient for water movement

50. The loss of water from the leaves of the plant is transpiration. How this process is advantageous for the plant?

(a) It helps in the downward movement of the water.

(b) It helps the plant to maintain temperature in hot sunny days.

(d) helps maintain a constant level of water in the soil around the plant

51. A plant gets rid of excess water through transpiration. Which is a method used by plants to get rid of solid waste products?

(a) shortening of stem

(b) dropping down of fruits

(d) expansion of roots into the soil

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Case Studies

1. The Figure shown below represents an activity to prove the requirements for photosynthesis. During this activity, two healthy potted plants were kept in the dark for 72 hours. After 72 hours, KOH is kept in the watch glass in setup X and not in setup Y. Both these setups are air tight and have been kept in light for 6 hours. Then, Iodine Test is performed with one leaf from each of the two plants X and Y.

(i) This experimental set up is used to prove essentiality of which of the following requirements of photosynthesis?

A. Chlorophyll

B. Oxygen

C. Carbon dioxide

D. Sunlight

(ii) The function of KOH is to absorb

A. Oxygen.

B. Carbon dioxide.

C. Moisture.

D. Sunlight

(iii) Which of the following statements shows the correct results of Iodine Test performed on the leaf from plant X and Y respectively?

A. Blue - black colour would be obtained on the leaf of plant Xand no change in colour on leaf of plant Y.

B. Blue - black colour would be obtained on the leaf of plant Y and no change in colour onleaf of plant X.

C. Red colour would be obtained on the leaf of plant X and brown colour on the leaf of plant Y.

D. Red colour would be obtained on the leaf of plant Y and brown colour on the leaf of plant X

(iv)Which of the following steps can be followed for making the apparatus air tight?

i. placing the plants on glass plate

ii. using a suction pump.

iii. applying aseline to seal the bottom of jar.

iv. creating vacuum

A. i and ii

B. ii. and iii

C. i. and iii

D. ii. and iv

2. Read the following and answer any four questions from (i) to (v) All living cells require energy for various activities. This energy is available by the breakdown of simple carbohydrates either using oxygen or without using oxygen.

(i) Energy in the case of higher plants and animals is obtained by

a) Breathing

b) Tissue respiration

c) Organ respiration

d) Digestion of food

(ii) The graph below represents the blood lactic acid concentration of an athlete during a race of 400 m and shows a peak at point D.

Lactic acid production has occurred in the athlete while running in the 400 m race. Which of the following processes explains this event?

a) Aerobic respiration

b) Anaerobic respiration

c) Fermentation

d) Breathing

(iii) Study the graph below that represents the amount of energy supplied with respect to the time while an athlete is running at full speed.

Choose the correct combination of plots and justification provided in the following table.

(iv) The characteristic processes observed in anaerobic respiration are

i) presence of oxygen

ii) release of carbon dioxide

iii) release of energy

iv) release of lactic acid

a) i) ,ii) only

b) i), ii), iii) only

c) ii), iii), iv) only

d) iv) only

(v) Study the table below and select the row that has the incorrect information

3. The image shows the circulation of blood in fishes and humans

How is the circulations of blood in fish different from that in humans?

(a) The heart in fish is bigger in size.

(b) The flow of blood in fish is unidirectional.

(d) The heart of fish has more chambers compared to that of a human.

4. The image shows the healing of a wound.

Based on the image, what explains the process?

(a) platelets form clot by plugging the site of injury

(b) platelets uses component of broken vessel to form clot

(d) red blood cells and platelets migrate to site of injury and secrete substance that forms new vessel

5. The image shows the process of making food by a plant.

Which statement can be concluded from the image?

(a) plants absorb `CO_2` from air and `H_2O` from the soil as raw materials and convert them into glucose

(b) plants absorb `CO_2` from the soil and `H_2O` from air as raw materials and convert them into glucose

(d) plants absorb `O_2` from air and minerals from the soil as raw materials and convert them into heat energy

6. A student sets up an experiment to study the importance of nutrition in plants. The student takes 2 pots, pot 1 and pot 2 each with the same healthy plant. Both the pots were placed in the garden and watered properly. Pot 1 was kept as such, while pot 2 was kept in an air-tight glass box with caustic soda. Caustic soda absorbs carbon dioxide present in the surrounding. After 2 days, the student observes that the plant kept in the garden is healthy while the plant is placed in a container shed leaves and droops. What is the likely reason for this observation?

(a) lack of nutrients in the soil

(b) absence of oxygen for survival

(d) absorption of light by caustic soda restricting growth

7. Which of the equation show correct conversion of CO2 and H2O into carbohydrates in plants?

8. A student sets up an experiment to study photosynthesis in plants. The student de-starched a potted plant by keeping it in a dark room for 3 days. Half of the portion of de-starched leaf was placed in a bottle containing caustic potash (absorbs `CO_2`) as shown

The student then places the plant in light and tests the leaf after 5 hours for the presence of starch. The portions inside the bottle shows negative starch test by reflecting no change in colour when react with iodine, however, other upper portions of the leaf gave positive starch test showing blue-black colour with iodine. What can be evaluated from this experiment?

(a) carbon dioxide is directly linked with the colour of leaf

(b) carbon dioxide is necessary for preparing carbohydrate

(d) lack of carbon dioxide slows the process of photosynthesis

9. The image shows the bread moulds on a bread.

How these fungi obtain nutrition?

(a) by eating the bread on which it is growing

(b) by using nutrients from the bread to prepare their own food

(d) by allowing other organisms to grow on the bread and then consuming them

10. The image shows how Amoeba obtains nutrition.

How this process is advantageous for Amoeba?

(a) capturing of food takes less time

(b) complex food can be digested easily

(d) fast distribution of nutrition within the body

11. The image shows the human digestive system.

Digestion of food starts from which organ of the digestive system?

(a) mouth due to the presence of saliva

(b) oesophagus that moves the food in gut

(d) which helps in mixing food with digestive juices

12. The image shows a cross section of small intestine.

What will be the likely happen if the number of villi increases in the intestine?

(a) increase in the absorption of food

(b) fast elimination of waste from the body

(d) fast breakdown of larger food particles into smaller ones

13. Which pathway will occur in the cell of an athlete who is performing 100m sprint?

14. In the experiment, the student places candle and a living cockroach in the flask A, while a candle and a dead cockroach in flask B. The burning of candle needs oxygen.

After 10 minutes, the student observes that the candle in flask A extinguish faster while candle in flask B keeps burning for a longer time. What can be evaluated from this experiment?

(a) candle produces high amount of carbon dioxide

(b) living beings consumes oxygen during respiration

(d) water vapours produced by living beings prevents burning of candle

15. A student sets up an experiment to study human respiration using lime water, test tube and a straw. Lime water is colourless in the absence of `CO_2` and is milky in its presence. The student fills a freshly prepared limewater in a test tube and blows air through straw into the limewater. It was observed that the solution turns cloudy as shown.

What can be evaluated from this observation?

(a) oxygen is exhaled during respiration

(b) glucose is produced during respiration

(d) water vapours are produced during respiration

16. The image shows the process of photosynthesis in plants

Based on the image, which component is excreted by plants during photosynthesis?

(a) Carbon dioxide

(b) Glucose

(d) Oxygen

17. The image shows the structure of a nephron.

Nephron is a unit of filtration in kidneys that filters waste material. It selectively reabsorbs or excretes water with the help of capillaries that surround it. What is the likely benefit of this?

(a) It makes the process of filtration at Bowman’s capsule easier.

(b) It helps keep the output of urine constant throughout the day.

(d) It maintains the concentration of urine based on the amount of water present in the

body.

18. The image shows the excretory system in humans

What is the importance of the labelled part in excretory system?

(a) It produces urine.

(b) It filters waste from the blood.

(d) It carries urine from kidney to outside.

19. The image shows the transport of gases in body through heart and lungs.

Which option correctly shows the transport of oxygen to the cell?

(a) Lungs → pulmonary vein → left atrium →left ventricle → aorta → body cells

(b) Lungs → pulmonary vein → right atrium →right ventricle → aorta → body cells

(d) Lungs → pulmonary artery →right atrium → right ventricle→ vanacava → body cells

20. The image shows oxygenated and de-oxygenated blood in the human heart.

What is the direction of deoxygenated blood from right atrium of the heart?

(a) towards the lungs

(b) towards the lower body

(d) towards the left atrium of heart

21. The image shows the circulation of blood in fishes.

Which option correctly traces the pathway of blood flow in fish body?

(a) Gill capillaries→ oxygenated blood→ heart → body cells→ deoxygenated blood→ gills

(b) Gill capillaries→ oxygenated blood→ body cells→ deoxygenated blood→ heart→gills

(d) Gill capillaries→ oxygenated blood→ heart → body cells→ deoxygenated blood→ heart→gills

22. The image shows the structure of an artery

Which statement supports the likely reason for thick walls in arteries?

(a) to carry large amount of blood

(b) to allow easy exchange of gases with cells

(d) to sustain the high-pressure blood from the heart

23. A student performs an experiment using a balsam plant with intact stem, leaves, roots and flowers. The plant was kept in a test tube containing eosin solution (a pink colour dye). The test tube mouth was covered using cotton plug as shown.

The student kept the plant undisturbed in the lab. After 2-3 hours, a transverse section of stem was obtained using sharp scissors and studied under microscope. The studies reveal the presence of pink colour in the vessels of xylem. What does this observation explain?

(a) eosin solution gets stored in the xylem

(b) water moves through xylem in the plant

(d) most portion of the plant stem is occupied by xylem

24. A student setup an experiment using a well-watered plant. The plant’s roots and soil were covered with a rubber sheet. The plant was then kept in a glass bell jar and sealed with Vaseline at the bottom part to prevent the flow of air. The student keeps the apparatus in the light and observes water drops inside the jar after 2 hours as shown in the image.

What can be evaluated about transpiration from this experiment?

(a) Plant leaves give off water in form of vapours.

(b) Heat from the outside warms the jar which melts the vaseline into vapours.

(d) Covered roots and stem of the plant decreases the temperature of jar resulting in

condensation of moisture into vapours.

25. The image shows the transport of food material inside plant body with the help of phloem.

How is food transported from phloem to the tissues according to plants need?

(a) food is transported along with the water in plant’s body.

(b) food is transported in only direction like water in the plant body through xylem.

(d) Food is transported from a region where it is produced to other parts of the plants.

26. The image shows the movement of sucrose into phloem against the concentration gradient which also leads to the movement of water due to osmotic difference. This osmotic pressure allows movement of material in plant body.

How the movement of sucrose into phloem takes place initially?

(a) with the help of transpiration

(b) with the help of water gradient

(d) with the help of ADP molecules

📝 Acids, Bases, and Salts

Multiple Choice Questions

1) Our body works within the pH range of

(a) 5.6 to 7.0

(b) 7.0 to 7.8

(d) 3.5 to 6.0

2) 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

(d) An antacid

3) Which of the following statements is correct about an aqueous solution of an acid and of a base?

(i) Higher the pH, stronger the acid

(ii) Higher the pH, weaker the acid

(iii) Lower the pH, stronger the base

(iv) Lower the pH, weaker the base

(a) (i) and (iii)

(b) (ii) and (iii)

(d) (ii) and (iv)

4) The pH of the gastric juices released during digestion is

(a) less than 7

(b) more than 7

(d) equal to 0

5) Equal volumes of hydrochloric acid and sodium hydroxide solutions of the same concentration are mixed and the pH of the resulting solution is checked with a pH paper. What would be the colour obtained?

(a) Red
(b) Yellow
(c) Yellowish green
(d) Blue

6) What happens when a solution of an acid is mixed with a solution of a base in a test tube?

(i) The temperature of the solution increases

(ii) The temperature of the solution decreases

(iii) The temperature of the solution remains the same

(iv) Salt formation takes place

(a) (i) only

(b) (i) and (iii)

(d) (i) and (iv)

7) An aqueous solution turns red litmus solution blue. Excess addition of which of the following solution would reverse the change?

(a) Baking powder

(b) Lime

(d) Hydrochloric acid

8) During the preparation of hydrogen chloride gas on a humid day, the gas is usually passed through the 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

d) absorb `Cl^–` ions from the evolved gas

9) Which of the following is not a mineral acid?

(a) Hydrochloric acid

(b) Citric acid

(d) Nitric acid

10) A solution reacts with zinc granules to give a gas that burns with a 'pop' sound. The solution contains
a) `Mg(OH)_2`

b) `Na_2CO_3`

c) `NaCl`

d) `HCl`

11) A solution reacts with marble chips to produce a gas that turns lime-water milky. The solution contains

a) `Na_2SO_4`

b) ` CaSO_4`

c) `H_2SO_4`

d) `K_2SO_4`

12) Which of the following gives the correct increasing order of acidic strength

(a) Water < Acetic acid < Hydrochloric acid

(b) Water < Hydrochloric acid < Acetic acid

(d) Hydrochloric acid < Water < Acetic acid

13) Which of the following phenomena occur when a small amount of acid is added to water?

a) Ionisation

b) Neutralisation

c) Dilution

d) Salt formation

i) a) and b)

ii) a) and c)

iii) b) and c)

iv) b) and d)

14) Plants require a specific pH range for their healthy growth for most plants, the optimum pH range is from

(a) 5.5 to 7.0

(b) 7.0 to 7.8

(d) 11.5 to 14.0

15) Our stomach produces hydrochloric acid of pH range

(a) 1.5 to 3.5

(b) 2.1 to 6.0

(d) 3.5 to 4.5

16) One of the following is medicine for indigestion. This is

(a) sodium hydroxide

(b) manganese hydroxide

(d) potassium hydroxide

17) Tooth decay starts when the pH of the mouth is lower than

(a) 5.5

(b) 7.0

(d) 6.7

18) Which of the following salts does not contain water of crystallisation?

(a) Blue vitriol

(b) Baking soda

(d) Gypsum

References

http://www.cbseacademic.nic.in
NCERT Exemplar Science Class 10
http://www.cbseacademic.nic.in/cbe/
NCERT Science Class 10

Jay's Mathematics Classes

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