Paper: Science X Summative Assessment Term I Sample Paper - 4

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 and one Non-Metal which exists in liquid state at room temperature?

[Marks:1]

2] How is brain protected from shocks and injuries? [Marks:1]

3] Name the instrument used for measuring:

(i) Potential difference (ii) Current[Marks:1]

4] Define double displacement reaction with the help of an example. [Marks:2]

5] HCl and HNO3 show acidic characters in aqueous solution while alcohol and glucose solutions do not. Give reasons.

[Marks:2]

6] What happens to glucose that enters the nephron along with the filtrate? [Marks:2]

7] How many electrons will flow through a wire when the charge of 4C flows for 2 sec? Also find the current.

[Marks:2]

8] A wire is cut into three equal parts and then connected in parallel with the same source. How will its: (a) Resistance (b) resistivity gets affected?

(c) How would the total current and the current through the parts change?

[Marks:3]

9] How does the strength of the Magnetic field at the centre of a circular coil of a wire depend on

(a) Radius of the coil (b) number of turns of wire in the coil?

(c) Draw the magnetic lines of force in case of a circular coil of a wire.

[Marks:3]

10] How are water and minerals absorbed by the plant? [Marks:3]

11] What are the disadvantages of using fossil fuels? Give two instances where solar

cells are exclusively used as source of energy. [Marks:3]

12] (a) With the help of a suitable example, explain Oxidation and Reduction in terms of gain or loss of oxygen.

(b) Identify the substances that are oxidised and the substances that are reduced in the following reaction:

4Na(s) + O2(g) 2Na2O(s)

[Marks:3]

13] (a) What are ionic compounds? Ionic compounds conduct electricity only in molten state not in solid state. Why?

(b). Why do ionic compounds have high melting points?[Marks:3]

14] What are exothermic and endothermic reaction. Explain with the help of one example each.

[Marks:3]

15] The pH of the mouth of a person is lower than 5.5. What changes will occur in his mouth? How these changes can be controlled? Write any two measures.

[Marks:3]

16] Mention any three important functions of fore brain. [Marks:3]

17] Give the events that occur during photosynthesis. [Marks:3]

18] Name the hormones secreted by Thyroid, Pancreas and Adrenal glands. Write a function of each hormone

[Marks:3]

19] Tendril encircles or coils around the object in contact with it. Elaborate. [Marks:3]

20] A sanitary worker uses a white chemical having strong smell of chlorine gas to disinfect the water tank.

(a) Identify the chemical compound.

(b) Write the chemical formula.

(c) Write chemical equation for preparing it.

(d) Write its any two uses.

OR

(a) Write an equation to show the reaction between Plaster of Paris and water.

(b) Name the substance which on treatment with chlorine yields bleaching powder.

(c) Name the sodium compound which is used for softening hard water.

(d) What will happen if a solution of sodium hydrocarbonate is heated? Give the equation of the reaction involved.

[Marks:5]

21] Define corrosion. Name a metal which corrodes and one metal which does not.

Write any three methods of prevention of corrosion.

OR

[Marks:5]

Write balanced chemical equation for the reactions taking place when

(i) Zinc carbonate is calcinated.

(ii) Zinc sulphide is roasted.

(iii) Zinc oxide is reduced to Zinc.

(iv) Cinnabar is heated in the air.

(v) Magnese dioxide is heated with Aluminium Powder.

22] Draw a neat diagram of Respiratory System in Humans and label the following:

(i) Trachea (ii) Bronchi (iii) Lungs (iv) Larynx

Where does exchange of gases take place?

OR

Draw neat diagram of digestive system. Label its all parts. How the main components of the food digested in the small intestine? Explain.

[Marks:5]

23] (a) Draw a schematic diagram of the common domestic circuit.

(b) Write difference between overloading and short circuiting.

OR

Answer the following questions:

(i) What is the direction of magnetic field lines outside a bar-magnet?

(ii) What is SI unit of magnetic field?

(iii) What does crowding of magnetic field lines indicate?

(iv) What is the frequency of A.C. in India?

(v) Name two organs in human body where magnetic field is quite significant.

[Marks:5]

24] (i)An electric heater connected to a 220V lines has two resistance coil of 22 Ohms each. Calculate the current if these coils are used

(a) Separately(b) In series (c) In Parallel

(ii) Write two advantages and two limitations of using Solar Cooker.

OR

[Marks:5]

What happens to the deflection of the compass needle at a point near current carrying straight conductor

(a) If the current is increased.

(b) If the direction of current in the conductor is changed.

(c) If compass is moved away from the conductor.

(d) Draw the diagram showing the magnetic field lines around the straight current carrying wire.

25] Four students (a), (b), (c) and (d) measured the pH values of water, lemon juice and sodium bicarbonate solution. What is the correct decreasing order of pH values?

[Marks:1]

A. water > lemon juice > sodium bicarbonate

B. lemon juice > water > sodium bicarbonate

C.water > sodium bicarbonate > lemon juice

D. sodium bicarbonate > water > lemon juice

26] A drop of solution 'X' is placed on a strip of pH paper. A deep red colour in produced. The solution 'X' is:

[Marks:1]

A. NaOHB. WaterC. Na2CO3

D. HCl

27] Zinc granules were added to zinc sulphate, copper sulphate, aluminium sulphate and iron sulphate solutions as shown below. You would observe the deposition of metal on zinc in beakers:

[Marks:1]

A. I and III

B. I and IIC. II and IVD. II and IV

28] Four students performed the reactions of a dil Hydrochloric acid and a solution of sodium hydroxide with zinc metal and solid sodium carbonate separately. They reported the possible reaction by (√) and no reaction by (X). In which of the following sets all observations are correct?

[Marks:1]

A.

Set HCl+Zn HCl+Na2CO3 NaOH+Zn

(a) √ √ √

B.

Set HCl+Zn HCl+Na2CO3 NaOH+Zn

(b) x x √

C.

Set HCl+Zn HCl+Na2CO3 NaOH+Zn

(c) √ √ X

D.

Set HCl+Zn HCl+Na2CO3 NaOH+Zn

(d) √ √ √

29] On adding a few drops of universal indicator to three colourless solutions taken separately in three test tubes labeled P, Q, R respectively the colours developed in the solutions are marked in the following figures:

What is the correct decreasing order of pH. Values of the solutions.

[Marks:1]

A. P > Q > RB. Q > P > RC. R > Q > PD. R > P > Q

30] Fe2O3 + 2Al Al2O3 + 2Fe

The above reaction is an example of a[Marks:1]

A. Combination reactionB. Double displacementC. Decomposition reactionD. Displacement reaction

31] To determine the equivalent resistance of three resistors, when connected in a parallel arrangement, Four students connected the resistors as follows.

The correct set up is that of student.

[Marks:1]

A. AB. CC. DD. B

32] A student has to connect 4 cells of 1.5V each, to form a battery of voltage 6V

The correct way of connecting these cells is shown in figure.

[Marks:1]

A. B

B. CC. DD. A

33] The correct set up for studying the dependence of the current on the potential difference across a resistor is:

[Marks:1]

A. AB. BC. DD. C

34]

Four resistors are connected in Parallel. Each has a resistance 2 . The effective resistance is:

[Marks:1]

A. 8B. 4C. 0.25D. 0.5

35] The following circuit diagram shows the experimental set up for the study of dependence of current on potential difference. Which two circuit components are connected in series.

[Marks:1]

A. Battery and voltmeterB. Ammeter and voltmeterC. Resistor and voltmeterD. Ammeter and rheostat

36] Calculate the Equivalent Resistance from the following combination of resistors.

[Marks:1]

A. 2 B. 3 C. 1.5 D. 1

37] 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.

After four hours on performing starch test the result showed no starch formation in the

[Marks:1]

A. Covered portion of leaf AB. Covered portion of leaf BC. Covered portion of leaf CD. Covered portion of any of the above

38] Coverslip is put on the slide very gently to avoid: [Marks:1]

A. Crushing of the materialB. Oozing of glycerineC. None of theseD. Entry of air bubbles

39] The figure that correctly depicts the removal of chlorophyll is:

[Marks:1]

A. IB. IIC. IIID. IV

40] Leaves are destarched by keeping the plant in: [Marks:1]

A. Dark room for 3 hoursB. Light for 03 hoursC. Light for 03 daysD. Dark room for 03 days

41] In the following sketch of the stomatal apparatus, the parts I, II, III and IV were labeled differently by four students.

The correct labeling out of the following is:

[Marks:1]

A. I guard cell II stoma III starch granule IV nucleus

B. I guard cell II starch III nucleus IV stoma

C.I cytoplasm II chloroplast III stoma IV nucleus

D. I cytoplasm II nucleus III stoma IV chloroplast

42] After performing the experiment to show that germinating seeds give out carbon

[Marks:1]

dioxide during respiration, students drew the following diagrams

The correct labeled diagram isA. AB. BC. CD. D

Paper: Science X Summative Assessment Term I Sample Paper - 4

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] Metal: Mercury: Non metal: Bromine

2] The brain box called cranium protects the brain and has shock absorbing fluid in it which prevents it from shock and injuries.

3] (i) Volmeter (ii) Ammeter

4] It is a reaction in which there is an exchange of ions between the reactants

Na2SO4(aq) + BaCl2(aq) ? BaSO4(s) +2NaCl(aq) or any other

5] HCl and HNO3 produce H+ ions in aqueous solution. Hence, they show acidic character.

Alcohol and Glucose do not produce H+ ions in aqueous solution, hence, they do not show acidic characters.

6] Glucose that enters the nephron along with the filtrate after passing through the glomerulus, passes from the tubule of nephron where it is selectively reabsorbed and sent back to blood.

7]

8] (a)

Let Resistance of a wire = R

When cut into 3 equal parts

Resistance of each part =

When connected in Parallel, net resistance Rp:

(b) Resistivity will remain same.(c) Current through each part will be triple the previous and total current in the circuit will be 9 times.

9] (a) Strength of magnetic field (B) is inversely proportional to radius of the coil (r)

(b) Directly proportional to the Number of turns in the coil (N)

( c) The magnetic field lines will be like:

10] At the roots, cells in contact with the soil actively take up ions. It creates a difference in the concentration of these ions between roots of soil. To eliminate this difference, water moves in to the roots from the soil. Thus water of minerals are absorbed by the plants.

11] (i) Buring of coal or Petroleum Products lead to air pollution

(ii) The oxides of C, N and S are released on buring fossil fuels as acidic oxides it leads to acidic rain and affect water soil.

(iii) CO2, a green house gas causes global warming (or any other relevant point)

i. Source of electricity in artificial satellites ii. Used as source of electricity in radio and wireless transmissions, at TV relay stations, traffic lights and research centers.

12] (a) Oxidation: gain of oxygen by a substance

or any other example

Reduction: loss oxygen by a substance or any example

(b) Sodium (Na) is oxidised to sodium oxide as it gains oxygen and oxygen gets reduced.

13] (a) The compounds formed by transfer of electrons from metal to non metal are called ionic compounds

In ionic compounds, there are strong electrostatic forces of attraction between the oppositely charged ions. Due to this, movement of ions is not possible due to their rigid structure.

In molten state, the electrostatic forces of attraction between the oppositively charged ions are overcome due to heat.

(b) Ionic compounds have strong electrostatic forces of attraction between the ions. Therefore, it requires a lot of energy to overcome these forces. That is why ionic compounds have high melting points.

14] Exothermic: Reactions in which heat is released.

Endothermic: Reactions in which heat is absorbed.

or any other

15] When the pH of mouth of a person is lower than 5.5 tooth decay starts

Tooth enamel made up of calcium phosphate is corroded.

Measures:

(i) Clean the mouth after eating food

(ii) Use of toothpaste (generally basic in nature)

16] The functions of fore brain are:

(i) It has sensory area where information is received from sense organs.

(ii) It has motor area where impulses are sent to muscles or effector organs.

(iii) It has centres for visual reception, touch, smell, temperature and muscular activities.

17] The following events occur during photosynthesis:

(i) Absorption of light energy by chlorophyll.

(ii) Conversion of light energy to chemical energy and splitting of water molecules into hydrogen and oxygen.

(iii) Reduction of carbon dioxide to carbohydrates.

18] Gland Harmone Function

Thyroid Thyroxin Regulates fat protein and carbohydrate metabolisms

Pancrease Insulin Regular blood sugar level

Adrenal gland Adrenaline Prepage the body to face the emergency situation and blood pressure

19] Auxin diffuses to the other part which is away from the support. Part of the tendril in contact from the support does not grow rapidly

Part of the tendril away from the support grow rapidly and cause the tendril to grow around a support.

20] (a) Bleaching Powder

(b) CaOCl2

(c)

(d) Bleaching powder is used:

(i) as an oxidising agent in many chemical industries; and

(ii) for disinfecting drinking water to make it free of germs.

OR

(a) The chemical equation for the reaction of Plaster of Paris and water can be

represented as:

(b) Calcium hydroxide [Ca(OH)2], on treatment with chlorine, yields bleaching

powder.

(c) Washing soda (Na2CO3.10 H2O) is used for softening hard water.

(d) When a solution of sodium hydrogencarbonate is heated, sodium carbonate and water are formed with the evolution of carbon dioxide gas.

21] Corrosion: Process of slowly eating up of metals due to action of atmospheric gases

Metal does not corrode ? Gold

Which corrode ? Iron or any other

Prevention:

(i) By painting

(ii) By greasing or oiling

(iii) Galvinization

(iv) Tin plating/ Chromium plating etc. (any three)

OR

(i)

(ii) [1]

(iii)

(iv)

(v)

22]

(b) Exchange of gases take place in the alveoli

OR

(a)

It receive secretion from liver and pancreas in the form of juice and trypsin

Trysin digest proteins.

Lipase digest fats

Bile juice makes basic medium and emulsifies fats

Intestinal Juice converts proteins to amino acids Carbohydrates to glucose and fats to fatty acids and glycerol.

23]

(b)

(i) Over loading is caused when too many short circuit appliances are connected to a singl socket

(ii) When live wire and neutral wire come into direct contact

OR

(i) North Pole to South Pole

(ii) Tesla

(iii) Strong magnetic field

(iv) 50 Hz

(v) Heart and brain24]

(i) Separately: Current

(ii) Series R=R1+R2=44

(iii) In Parallel

Advantages of solar cooker:(any two) [1/2x4=2]

(1) Free of cost

(2) Does not cause any pollution

(3) Nutritive value of food is retained

Disadvantages:

(i) Can not used in night

(ii) Can not be used in cloudy day

(iii) Direction of sunlight is need and to be adjusted frequently or any other

OR

(a) Deflection increases

(b) Direction of deflection changes

(c) Deflection decreases. [1]

(d)

Looking at a crossection lying in the plane of the paper.

At a distance d from the wire, the magnetic field direction is as shown and the magnitude is constant for all points shown.

25] sodium bicarbonate > water > lemon juice

26] HCl

27] II and IV

28] Set HCl+Zn HCl+Na2CO3 NaOH+Zn NaOH+Na2CO3

(d) ? ? ? X

29] R > P > Q

30] Displacement reaction

31] B

32] A

33]

34]

0.535]

Ammeter and rheostat36]

1 37]

Covered portion of any of the above38]

Entry of air bubbles

39]

40] Dark room for 03 days

41] I cytoplasm II nucleus III stoma IV chloroplast

42]