Paper: Science X Summative Assessment Term I Sample Paper - 2

Total marks of the paper: 90

Total time of the paper: 3.5 hrs

General Instructions:

1. The question paper comprises of two sections, A and B you are to attempt both the sections.

2. All questions are compulsory.

3. There is no overall choice. However, internal choice has been provided in all the three questions of five marks category. Only one option in such question is to be attempted.

4. All questions to section A and all questions of section B are to be attempted separately.

5. Question numbers 1 to 3 in section A are mark questions. These are to be answered in one word or one sentence.

6. Question numbers 4 to 7 are two marks questions, to be answered in about 30 words.

7. Question number 8 to 19 is three mark questions, to be answered in about 50 words.

8. Question number 20 to 24 are five mark questions, to be answered in about 70 words.

9. Question numbers 25 to 42 in section B are multiple choice questions based on practical skills. Each question is a one mark question. You are choosing one most appropriate response out of the four provided to you.

10. An addition 15 minutes time has been allotted to read this question paper only.

Questions:

1] Name one metal which has low melting point: [Marks:1]

2] Which part of brain is responsible for precision of voluntary actions? [Marks:1]

3] Why ventricles have thicker walls than auricles? [Marks:1]

4] What is commercial unit of energy? [Marks:2]

5] What is redox reaction? When magnesium ribbon burns in the air and forms a white ash, is magnesium oxidized or reduced?

[Marks:2]

6] A milkman added a small amount of baking soda to fresh milk.

(a) Why does he shift the pH of fresh milk to slightly alkaline?

(b) Why does this milk take a longer time to set as a curd?

[Marks:2]

7] Name the two glands associated with the digestive system in humans. Name their secretion also.

[Marks:2]

8] (a) What happens when Iron nails are kept into a Copper sulphate solution? Write the balanced chemical equation for the reaction.

(b) Give one example of precipitation reaction.[Marks:3]

9] (a) What are ionic compounds?

(b) Give the formation of MgCl2 from Mg and Cl2[Marks:3]

10] Explain why:

(a) Respiration is an exothermic reaction?

(b) All decomposition reactions are endothermic reaction?

(c) When blue salt of copper sulphate is heated, it becomes colourless?

[Marks:3]

11] You are provided with three test tubes A, B, C which contain distilled water, Acidic and basic solutions. If you are given blue litmus paper only, how will you identify the nature of the solutions in three test tubes.

[Marks:3]

12] A 500W electric iron used in a house for 2 hours per day. Calculate the cost to use it for 60 days at Rs 3.20 per kWh.

[Marks:3]

13] Calculate the effective resistance between P and Q.

[Marks:3]

14] Give reasons for the following:

[Marks:3]

(i) The glottis is guarded by epiglottis.

(ii) The lungs alveoli are covered with blood capillaries.

(iii) The wall of the trachea is supported by cartilage rings

15] Write the functions of parts of hind brain. [Marks:3]

16] Draw a labeled diagram of a Neuron. Explain its Functions [Marks:3]

17] Name the hormone synthesized at the shoot tips. How does it help the plant to response to light?

[Marks:3]

18] How will the magnetic field Produced in a current carrying a circular coil change if we

(i) Increase the value of current.

(ii) Increase the distance from the coil

(iii) Increase the no. turns of the coil

[Marks:3]

19] Write three limitations of harnessing three types of energy from Oceans. [Marks:3]

20] Draw a labelled diagram of Human Heart. Draw a table to show the functions of any two chambers of Human Heart.

OR

(a) Draw a labelled diagram of Stomata.

Write two Functions of Stomata.

(b) What are the raw materials used during photosynthesis. Write chemical equation for photosynthesis.

[Marks:5]

21] (a) Write the chemical name and formula of washing soda. How is it prepared? Write the chemical equation of the reaction.

[Marks:5]

(b) Why does distilled water not conduct electricity, whereas rain water does?

OR

(a) Five solutions A, B, C, D and E when tested with universal indicator showed pH as

4, 1,11,7 and 9, respectively. Which solution is

(i) neutral?

(ii) strongly alkaline?

(iii) strongly acidic?

(iv) weakly acidic?

(v) weakly alkaline?

Arrange the pH in increasing order of hydrogen-ion concentration.

(b) Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid (HCl) is added to test tube A, while acetic acid (CH3COOH) is added to test tube B. In which test tube will the fizzing occur more vigorously and why?

22] A metal E is stored under kerosene. When a small piece of it is left open in the air, it catches fire. When the product formed is dissolved in water, it turns red litmus to blue:

(i) Name the metal E.

(ii) Write the chemical equation for the reaction when it is exposed to air and when the product is dissolved in water. (iii) Explain the process by which the metal is obtained from its molten chloride.

OR

What are alloys? How are they made? Name the constituents and uses of brass, bronze and solder.

[Marks:5]

23] What is a solenoid? Draw the patterns of magnetic field lines of a solenoid through which a steady current flows? What does the pattern of field lines inside the solenoid indicate? Write a use of it.

OR

(a) State the rule to determine the direction of a

(i) Magnetic field produced around a straight conductor carrying current

(ii) Force experienced by current – carrying straight conductor placed in a

[Marks:5]

magnetic field which in perpendicular to it.

(iii) Current induced in a coil due to its rotation in a magnetic field.

(b) What is the function of an earth wire? Why is it necessary to earth metallic appliances?

24] (a)A coil of insulated wire is connected to a galvanometer. What would be seen if a bar magnet with its south pole towards one Face of the coil is:

(a) Moved quickly towards it?

(b) Moved quickly away from it?

(c) Placed near its one face?

(d) Name the phenomena involved?

(b) What are renewable sources of energy? Give two examples and one use of each.

OR

(a)Which gas is filled in the electric bulb and why?

(b)On what factors do the resistance of a conductor depend and how? Write SI unit of resistance.

[Marks:5]

25] The graph between current (I) and potential difference (V) in the experimental verification of Ohm's Law drawn by four students. Which one is correct?

[Marks:1]

A.

B.

C.

D.

26] While performing the experiment on studying the dependence of current (I) on the potential difference (v) across a resistor four students I, II, III, and IV set up the circuit as shown:

The correct result will be obtained by the student:

[Marks:1]

A. IB. IIIC. IVD. II

27] For the circuits shown in figures I and II, the ammeter readings would be

[Marks:1]

A. 0A in Circuit I and 1A in Circuit IIB. 0A in both CircuitsC. 1A in both CircuitsD. 1A in Circuit I and 0A in Circuit II

28] Three resistors each having same resistance are connected in parallel. Their equivalent resistance is 1 . If they are connected in series, their equivalent resistance will be:

[Marks:1]

A. 3B. 1C. 6D. 9

29] The resistors R1 and R2 are connected in

[Marks:1]

A. Parallel in both circuitsB. Series in both circuitsC.

Series in circuit I and in parallel in circuit II

D. Parallel in circuit I and in series in circuit II

30] Identify A and B in the following figure :

[Marks:1]

A. A=Gas chamber,B=MixtureB. B =Gas chamber, A =MixtureC. None of the aboveD. A=Digestor,B=Gas outlet

31] Which of the following stain is used to see the stomata during temporary mount of leaf peel?

[Marks:1]

A. Methylene blueB. Cotton blueC. None of theseD. Safrainin

32] To remove chlorophyll, the leaf is boiled into: [Marks:1]

A. WaterB. Iodine solutionC. None of theseD. Alcohol

33] In an experiment to show that sun light is necessary for photosynthesis. The leaf is boiled in alcohol for a few minutes using a water bath. It is essential because:

[Marks:1]

A. Alcohol is highly volatile

B. Steam from the water bath heats the leaf rapidly

C. Steam from the water bath dissolve the chlorophyll

D. Alcohol is inflammable

34] To show that CO2 is released during respiration we take [Marks:1]

A. Dry SeedsB. Boiled seedsC. Wet seedsD. Germinating seeds

35] The function of KOH in the experimental set up to show that CO2 is released during respiration is:

[Marks:1]

A. To enhance respirationB. To release Oxygen for respiration

C. To remove water vapour from the flask

D.To absorb CO2 released by germinating seeds

36] In an experiment on photosynthesis we cover a portion of leaf 'A', of a de-starched potted plant with a red coloured strip, a portion of another leaf B with black and a portion of leaf C with a green strip and then keep the plant in sunlight so that photosynthesis may place.

[Marks:1]

After four hours on performing starch test the result showed no starch formation in theA. Covered portion of leaf AB. Covered portion of leaf BC. Covered portion of leaf CD. Covered portion of any of the above

37] The pH value of a solution is in the range of 6 to 8. What is the colour developed when a student adds 3 drops of universal indicator in the solution?

[Marks:1]

A. RedB. BlueC. OrangeD. Green

38] The pH values of distilled water, fruit juice and sodium bicarbonate were measured using pH papers. What is the correct decreasing order of pH values

[Marks:1]

A. Water > Fruit juice > Sodium bicarbonate

B. Fruit juice > Water > Sodium bicarbonate

C.Water > Sodium bicarbonate > Fruit juice

D. Sodium bicarbonate > Water > Fruit juice

39] Four students studied reactions of zinc and sodium Carbonate with dilute hydrochloric acid and dilute sodium hydroxide solutions and presented their results as follows. The '√' represents evolution of gas whereas 'X' represents absence of any reaction,

The right set of observations is that of student

[Marks:1]

A. BB. C

C. DD. A

40] If Iron Nails are kept in CuSO4 solution for two hours, the colour of the solution will change in to

[Marks:1]

A. PinkB. RedC. YellowD. Light green

41] When a drop of an unknown solution X is placed on a strip of pH paper, a deep blue colour is produced. This sample should be which one of the following?

[Marks:1]

A. Lemon juiceB. WaterC. HClD. NaOH

42] Which of the statements about the reaction below are incorrect?

2PbO(s) + C(s) 2Pb(s) + CO2 (g)

(i) Lead is getting reduced.

(ii) Carbon dioxide is getting oxidised.

(iii) Carbon is getting oxidised.

(iv) Lead oxide is getting reduced.

[Marks:1]

A. (i) and (iii)B. (i), (ii) and (iii)C. AllD. (i) and (ii)

Paper: Science X Summative Assessment Term I Sample Paper - 2

Total marks of the paper: 90

Total time of the paper: 3.5 hrs

General Instructions:

1. The question paper comprises of two sections, A and B you are to attempt both the sections.

2. All questions are compulsory.

3. There is no overall choice. However, internal choice has been provided in all the three questions of five marks category. Only one option in such question is to be attempted.

4. All questions to section A and all questions of section B are to be attempted separately.

5. Question numbers 1 to 3 in section A are mark questions. These are to be answered in one word or one sentence.

6. Question numbers 4 to 7 are two marks questions, to be answered in about 30 words.

7. Question number 8 to 19 is three mark questions, to be answered in about 50 words.

8. Question number 20 to 24 are five mark questions, to be answered in about 70 words.

9. Question numbers 25 to 42 in section B are multiple choice questions based on practical skills. Each question is a one mark question. You are choosing one most appropriate response out of the four provided to you.

10. An addition 15 minutes time has been allotted to read this question paper only.

Solutions:

1] Gallium or Cesium (any one).

2] Cerebellum

3] Since ventricles have to pump blood into various organs, therefore, they have thicker muscular walls than the auricles.

4] Commercial unit of energy is Kilowatt hour or KWh.

5] Chemical reaction in which one reactant gets oxidized while the other gets reduced is called a redox reaction.

Mg gets oxidized on burning in air.

6] (i) Fresh milk is acidic and gets spoiled easily. In presence of baking soda, milk becomes alkaline and can be stored for a longer time.

(ii) When milk sets to curd, pH decreases. The alkali does not allow it to become more acidic easily. So it takes more time.

7]

Name of gland Secretion

Salivary gland Saliva

Gastric gland Gastric juice

Liver Bile

Pancreas Pancreatic Juice

(any two)

8] (a) When Iron nails are kept into a copper sulphate solution, Iron displaces copper

from CuSO4 solution and blue colour of CuSO4 solution becomes light green.

(b)

9] (a) Ionic compounds are formed by the transfer of electrons from metal to non metal.

(b)

10] (a) Respiration is an exothermic process since energy is released during the

process.

(b) Energy in the form of heat, light or electricity is required for decomposition Reactions hence these are endothermic.

(c)

The solution becomes colourless because of copper sulphate formed which is colourless.

11] (i) Test the three solutions with blue litmus paper, the one solution will change blue litmus into red it is Acidic solution

(ii) Test the remaining two solution with the red litmus (Changed in activity (i)) one solution will change it again to blue It is basic solution. (iii) Remaining third solutions is distilled water

12]

13]

In series (i) R1 = 5+5 =10

(ii) R2 = 6+4 = 10

In pararell

(i)

14] (i) Glottis gets covered by a small cartilaginous flap of skin called epiglottis which prevents the entry of food particles into wind pipe while swallowing.(ii) The lung alveoli are richly supplied with blood capillaries for the exchange of gases. From the thin walls of alveoli, oxygen diffuses into blood and is supplied to the tissues while carbon dioxide is absorbed by blood from the tissues and is carried to the alveoli of lungs for exhalation.

(iii) The walls of trachea is supported by C – shaped cartilage rings which does allow the trachea to collapse in the presence of less air in it.

15] Hind brain has three parts:

(i) Cerebellum: It is the regulating centre for swallowing, coughing, sneezing and vomiting and helps to maintain the balance of the body and coordinate the muscular activities.

(ii) Pons: It takes part in the regulation of respiration.

(iii) Medulla oblongata: It is responsible for the coordination and adjustment of movement and posture.

16] (a) Diagram of Neuron:

Functions of Neuron:

(i) To carry information from receptors to brain and spinal cord.

(ii) To transfer respose from brain and spinal cord to effectors.

17] (a) Auxin.

When light is coming from one side of the plant auxin diffuses towards shady sides.

This concentration stimulates the cells to grow longer on the side of the shoot which is away from the light and shoot bends.

18] (i) Magnetic field will increase

(ii) Magnetic field will decrease

(iii) Magnetic field will increase

19] (i) Wave energy be a viable proposition only when waves are very strong.

[1x3=3]

(ii) A tidal power station at the mouth of a river blocks the flow of polluted water into the

sea. It creates health and pollution hazards.

(iii) Efficient commercial exploitation is difficult or any other.

20] (a)

(b) Functions of two chambers of human heart:

Left Atrium – Receive oxygenated blood from pulmonary vein

Right Atrium – Receive deoxygenated blood from vena cava

Left Ventricle – Pumps oxygenated blood to all parts of body

Right Ventricle – Pumps deoxygenated blood to lungs. (Any two)

OR

(a) Diagram of stomata:

(b) Functions of stomata:

(a) Exchange of gases

(b) Transpiration

Raw materials for photosynthesis CO2, H2O

21] (a) The chemical name of washing soda is Sodium carbonate Decahydrate.

The formula is Na2CO3.10H2O

It is obtained by heating baking Soda and then recrystallization.

(b) Distilled water is a pure form of water and is devoid of any ionic species. Therefore, it does not conduct electricity. Rain water, being an impure form of water, contains many ionic species such as acids and therefore it conducts electricity.

OR

(a)

(i) Neutral- Solution D with pH 7 (ii) Strongly alkaline- Solution C with pH 11 (iii) Strongly acidic- Solution B with pH 1 (iv) Weakly acidic- Solution A with pH 4 (v) Weakly alkaline- Solution E with pH 9

The pH can be arranged in the increasing order of the concentration of hydrogen ions as: 11 < 9 < 7 < 4 < 1

(b) The fizzing will occur strongly in test tube A, in which hydrochloric acid (HCl) is added.

This is because HCl is a stronger acid than CH3COOH and therefore produces hydrogen gas at a faster speed due to which fizzing occurs.

22] (i) Metal – sodium

(ii)

(iii)Electrolysis of molten chloride (NaCl) is the process.

i.e. we can write:

OR

Definition: Homogeneous mixture of two or more metals or a metal and a non metal is called an alloy.

Prepared: (i) By melting the primary metal.

(ii) By dissolving the other elements in a definite proportion and cooled to room temperature.

23] A coil of many circular turns of insulated copper wire wrapped closely in the shape of a cylinder.

The magnetic field is uniform inside the solenoid

Used to magnetise a piece of magnetic material.

OR

(a)

(i) Right hand Thumb rule

(ii) Fleming's Left hand rule

(iii) Fleming's Right hand rule

(b)

(a) To avoid the risk of electric shocks

(b)To save the electrical appliances from damage.

24]

(a)

(i) Momentary deflection in the galvanometer to one side.

(ii) Momentary deflection in the galvanometer now in opposite direction.

(iii) No deflection in the galvanometer. Phenomenon involved is electromagnetic induction.

(b) An energy source that can be replenished in a short period of time and state one use each.

Eg. Solar Energy, Wind energy, Ocean energy etc. Any use.

OR

(a)Argon or Neon gas is filled in the electric bulbs.

These are used since these are inactive or inert gases to prolong life of the filament.(b)

(i) Length of the conductor: proportional

(ii) Area of cross section: inversely proportional

(iii) Material of conductor

25]

26] II

27] 1A in Circuit I and 0A in Circuit II

28]

9

29] Parallel in circuit I and in series in circuit II

30] A=Digestor,B=Gas outlet

31] Safrainin

32] Alcohol

33] Alcohol is inflammable

34] Germinating seeds

35] To absorb CO2 released by germinating seeds

36] Covered portion of any of the above

37] Green

38] Sodium bicarbonate > Water > Fruit juice

39] A

40] Light green

41] NaOH

42] (i) and (ii)