Category: AP SSC

AP SSC 10th class Maths 2 Model paper 2015-16 English Medium Set 2

SECTION – I

Note : 1) Answer ANY FIVE questions choosing at least TWO from each of the following groups i.e., A and B.
2) Each question carries 2 marks.
Group – A

Group – B

SECTION – II

Note : 1) Answer ANY FOUR of the following six questions.
2) Each question carries 1 mark.

SECTION – III

Note : 1) Answer ANY FOUR questions, choosing TWO from each of the following groups, i.e., A and B.
2) Each question carries 4 marks.
Group – A

Group – B

SECTION – IV

Note : 1) Answer ANY ONE question from the following.
2) This question carries 5 marks

ANSWERS

SECTION – I

Group – A

Group – B

SECTION – II

SECTION – III

Group – A

Group – B

SECTION – IV

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AP SSC 10th class Hindi Model paper 2015-16  Set 4

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AP SSC 10th class Sanskrit Model paper 2015-16 Set 10

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AP SSC 10th class Telugu Model paper 2015-16 Set 4

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AP SSC 10th class Sanskrit Model paper 2015-16 Set 5

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AP SSC 10th class Telugu Model paper 2015-16 Set 6

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AP SSC 10th class Hindi Model paper 2015-16  Set 3

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AP SSC 10th class Telugu Model paper 2015-16 Set 10

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AP SSC 10th class Sanskrit Model paper 2015-16 Set 4

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AP SSC 10th class General Science Model paper 2015-16 English Medium Set 5

                                                                    SECTION-I
Group – A
1. Why is it difficult to shoot a fish swimming in water ?
2. What is the equivalent resistance of two resistors 6Q and 120 when connected in
series and b) parallel ?
3. Why the sun appears white during noon hours ?

Group – B
5. Write an equation for decomposition reaction where energy is supplied in the form of heat / light / electricity.
6. Write the uses of washing soda ?
7.What is nl^x method ? How it is useful ?
8. What is micelle ? Draw it’s diagram.

                                                                    SECTION – II
9. State the Lenz’s principle.
10. What is accommodation of lens ?
11. State Fermat’s principle.
12. What is Fermentation ? ‘
13. Write the names of any two ores of iron ?
14. Write the Plank’s equation.

                                                                 SECTION-III
Group – A
15. “The rate of rise in temperature depends on the nature of substance.” Explain it with an activity.
16. Explain the formation of mirage ?
17. State Ohm’s law. Suggest an experiment to verify it and explain the procedure.
18. Harsha tells Siddhu that the double convex lens behaves like a convergent lens. But Siddhu know that Harsha’s assertion is wrong and corrected. Harsha by asking some questions. What are the questions asked by Siddhu?
Group – B
19. Write the balanced chemical equation for the following reaction :
a)  Combustion of propane
b)  Sodium chloride reacts with silver nitrate.
c) Sodium hydroxide reacts with hydrochloric acid,
d) Carbon burns in presence of oxygen.
20. Five solutions A, B, C, D and E when tested with universal indicator showed pH as
4, 1, 11, 7 and 9 respectively.                           ’
a) Which solution is strong acid ?
b) Winch solution is strong base ?
c) Which solution is weakly acidic ?
d) Which solution is weakly alkaline ?
e) Which solution is neutral ?
21. Explain the formation of 0₂ molecule using Valence bond theory ?
22. Explain the cleaning action of soap.

                                                           SECTION – IV
23. Draw a neat diagram of electric motor. Name the parts.
24.Draw a neat diagram of Blast furnace and label it parts.

Answers

                                                                 SECTION-I
Group-A
1. Why is it difficult to shoot a fish swimming in water ?
A. It is difficult to shoot a fish swimming in water because what we are seeing in the water is not actual fish but is the apparent image of the fish and changes its position continuously because of swimming.

3. Why the sun appears white during noon hours ?
A. 1) During noon hours, the distance to be travelled by the sun rays in the atomosphere is less than that compared to morning and evening hours.
2) Therefore all colours reach your eye without much scattering. Hence the sun appears white during noon hours.

In the above figure, find the potential at A when the potential at B is zero.
A. From the figure it is clear that.
V_A – V_B = 2 + 5 x 1 = 7V.
But given V_B = 0
=>V_A = 7V.

Group – B
5. Write an equation for decomposition reaction where energy is supplied in the form of heat / light / electricity.

6. Write the uses of washing soda ?  –
A.1)  Washing soda is used in glass, soap and paper industries.
2) It is used the manufacture of sodium compounds such as borax.
3) Washing soda can be used as a cleaning agent for domestic purposes.
4) It is used for removing permanent hardness of water.
7. What is nl^x method ? How it is useful ?

8. What is micelle ? Draw it’s diagram.
A. spherical aggregate of soap molecules in water is called micelle.

                                                                    SECTION – II
9. State the Lenz’s principle.
A. Lenz’s principle : The induced current set up in the coil is in such a direction that it opposes the changes in the flux.
10. What is accommodation of lens ?
A. The ability of eye lens to change its focal length is called accommodation of lens.
11.State Fermat’s principle.
A.Fermat Principle : Light chooses the path which takes the least time to travel.
12. What is Fermentation ?
A.The process of conversion of starches and sugars to C₂H₅OH is called fermentation process.
13. Write the names of any two ores of iron ?
A. 1) Haematite (Fe₂Q₃)
2)Magnetite (Fe₃0₄)

                                                                  SECTION-III
Group – A
15. “The rate of rise in temperature depends on the nature of substance.” Explain it with an activity.
A.Procedure :
1) Take a large jar with water and heat it up to 80°C.
2) Take two identical boiling test tubes with single – holed corks.
3) Fill them, one of the boiling tube with 50 gm of water and other with 50 gm. of oil.
4) Insert two thermometers in each of tubes and clamp them to retort stand and place them in a jar of hot water.

5) Observe the readings of the thermometers for every 3 minutes.
6) We can observe the rise in temperature of oil is higher than that of water.
7) So, we conclude that rise in temperature depends on the nature of substance.
16. Explain the formation of mirage ?
A.Formation of Mirage :
1. When the light from a tall object such as tree or from the sky passes through a medium just above the road then the refractive index of light decreases towards ground.
2) It undergoes refraction and takes a curved path because of total internal reflection.

3) When this light reaches the observer then it appears as if it is reflected from theground.
4) Hence we feel the illusion of water being present on road which is the virtual image of the sky called as mirage.
17. State Ohm’s law. Suggest an experiment to verify it and explain the procedure.
A. Ohm’s Law : The potential difference between the ends of a conductor is directly
proportional to the electric current passing through it at constant temperature.
Aim : To verify Ohm’s law or to show that — ⁼ constant.
Material required : 5 dry cells of 1.5V each, conducting wires, an ammeter, a volt meter, thin iron spoke of length 10 cm. LED and key.

Procedure:
1) Connect a circuit as shown in the above figure.
2) Note the readings of current from ammeter and potential difference from

3) Now connect 2 cells (in series) instead of one cell in the circuit. Note the values of ammeter and voltmeter and note them in the above table.
4) Repeat the same for 3 cells, 4 cells and 5 cells respectively.
5) Record the values of V and I corresponding to each case in the table.
6) Find V/I for each set of values.
V/I ⁼ constant => V/I = R
Therefore, Ohm’s law is verified.
18. Harsha tells Siddhu that the double convex lens behaves like a convergent lens. But Siddhu know that Harsha’s assertion is wrong and corrected Harsha by asking some questions. What are the questions asked by Siddhu ?
A. 1) What happens to the rays when the object kept in between pole and focal point ?
2)Is refractive index of the medium or lens plays any role in this regard ?
3) If the refractive index of medium is greater than that of the lens, then how the lens behaves ?
4) How does the lens behaves if it is kept in water ?
5) How does air bubbles in water behave ?

Group – B                                               ,
19. Write the balanced chemical equation for the following reaction.
a) Combustion of propane
A.C₃H₈ + 50₂ —» 3CQ₂ + 4H₂0
b)Sodium chloride reacts with silver nitrate.
A.NaC l + AgN0₃ -> AgC/ + NaN0₃ ’
c) Sodium hydroxide reacts with hydrochloric acid.
A.NaOH + HC l-> NaC/ + H₂0 .
d)Carbon burns in presence of oxygen.
A. C + 0, -» C0₂
20. Five solutions A, B, C, D and E when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively.
a) Which solution is strong acid ?
A. Strong Acid = B.
b) Which solution is strong base ?
A. Strong base = C .
c)Which solution is weakly acidic ?
A. Weakly acidic = A
d)Which solution is weakly alkaline ?
A. Weakly alkaline = E
e)Which solution is neutral ?
A. Neutral = D
21. Explain the formation of 0₂ molecule using Valence bond theory ?

22. Explain the cleaning action of soap.
A. 1) Soap has one polar end and one non-polar end as shown in the figure.
2) The polar end is hydrophilic in nature and this end is attracted towards water.
3) The non-polar end is hydrophobic in nature and it is attracted towards grease or oil on the cloth, but not attracted towards water.
4) When soap is dissolved in water, its hydrophobic ends attach themselves to dirt and remove it from the cloth and form a micelle.
5) These micelles remain suspended in water like particles in colloidal solution. The various micelles present in water do not come together to form a precipitate.
6) Thus, the dust particles remain trapped in micelles and are easily rinsed awav with water. Hence soap micelles remove dirt by dissolving it in water.

                                                                      SECTION – IV
23. Draw a neat diagram of electric motor. Name the parts.

24. Draw a neat diagram of Blast furnace and label it parts

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AP SSC 10th class General Science Model paper 2015-16 English Medium Set 3

                                                         SECTION -I

Group – A
1. Write the rules for sign convention for the parameter related to the mirror equation.
2. The focal length of a converging lens is 20 cm. An object is 60 cm from the lens. Where will the image be formed and what kind of image is it ?
3. Are the headlights of a car connected in series or parallel ? Why ?
4. What is magnetic flux density ? Write it’s units.
Group – B
5. Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid is added to test tube A, while acetic acid is added to test tube B. Amount and concentration of both the acids is same ? In which test tube will the fizzing occur more vigorously and why ?
6. A shiny brown coloured element ‘x’ on heating in air becomes black in colour. Can you predict the element ‘X’ and the black coloured substance formed ? How do you support your predictions ?
7. ‘X’ is an element belongs to ‘3’rd period and 13^th group then answer the following.
i) Write the electron configuration of ‘X’ ?
ii) What is the valency of ‘X’ ?
8. How do you appreciate the role of esters in everyday life ?

                                                                 SECTION -II
9. Equal amounts of water are kept in a cap and in a dish. Which will evaporate faster ? Why?
10. Write the mirror formula.
11. What is presbyopia ?
12. What is the use of keeping food in air tight containers ?
13. Represent the molecule H₂0 using Lewis notation.
14. Name the product other than water formed on burning of ethanol in air.

                                                             SECTION – III
Group – A
15. Suggest an experiment to prove that the rate of evaporation of a liquid depends on its surface area and vapour already present in surrounding air.
16. Write the working of optical fibres and also their uses in our daily life.
17. Explain Kirchhoff’s laws with examples.
18. Explain the working of AC electric generator with a neat diagram.
Group – B
19. What is an exothermic reaction ? Why does respiration considered as an exothermic reaction ? Explain.
20. Compounds such as alcohol and glucose contain hydrogen but are not categorized as acids. Describe an activity to prove it.
21. What is hybridisation ? Explain the formation of BF₃ molecule using hybridisation.
22. Suggest a chemical test to distinguish between ethanol and ethanoic acid and explain the procedure.
                                                            SECTION – IV
23. Show the formation of image with a ray diagram when an object is placed on the principal axis of a concave mirror away from the centre of curvature.
24. Draw the shapes of five ‘d’ orbitals.
                                                        








Answers

                                                             SECTION -I

Group – A
1. Write the rules for sign convention for the parameter related to the mirror equation.
A. 1) All distance should be measured from the pole.
2) The distance measured in the direction of incident light, to be taken positive and those measured in the direction opposite to incident light to be taken negative.
3) Height of object (H_o) and height of image (Hi) are positive if measured upwards from the axis and negative if measured downwards.
2. The focal length of a converging lens is 20 cm. An object is 60 cm from the lens. Where will the image be formed and what kind of image is it ?

3)  Nature of image : Real and inverted.
Size    : Diminished
Location  : 30 cm from the lens other side.
3. Are the headlights of a car connected in series or parallel ? Why ?
A. The headlights of a car are connected in parallel.
Reasons :
1) When they are connected in parallel, same voltage (RD) will be maintained in the two lights.
2) If one of the light damaged, the other will work without any disturbance.
4. What is magnetic flux density ? Write it’s units.
A.1)  Magnetic flux density (B) is defined as the ratio of flux passing through a plane perpendicular to field and the area of the plane.
2) Units of magnetic flux density is Wb/m² or Tesla.

Group – B
5. Equal lengths of magnesium ribbons are taken in test tubes A and B. Hydrochloric acid is added to test tube A, while acetic acid is added to test tube B. Amount and concentration of both the acids is same ? In which test tube will the fizzing occur more vigorously and why ?
A. 1) The volatility of acetic acid is more than that of hydrochloric acid. But HC/ solution has more strength than acetic acid.
2) Hence magnesium ribbon in test tube A will react more vigorously in B.
6. A shiny brown coloured element ‘x’ on heating in air becomes black in colour. Can you predict the element ‘X’ and the black coloured substance formed ? How do you support your predictions ?
A. 1) The name of element X is copper (Cu)
2) Name of black coloured substance is copper oxide [CuO]

ii) What is the valency of ‘X’ ?
A. The valency of aluminium is 3.
8. How do you appreciate the role of esters in everyday life ?
A. 1) Esters are used in making artificial perfumes.
2) This is because of the fact that most of the esters have a pleasant smell.
3) Esters are also used as flavouring agents.
4) This means that esters are used in making artificial flavours and essences used in ice-cream, sweets and cool drinks.
5) That’s why we can appreciate the role of esters in everyday life.

                                                                SECTION – II 

9. Equal amounts of water are kept in a cap and in a dish. Which will evaporate faster ? Why ?
A.1) The water in dish has more evaporation than the water in cap.
2) Because, the rate of evaporation is directly proportional to the surface area of the dish.
10. Write the mirror formula.
A. Mirror formula : 1/f =1/u + 1/v
11. What is presbyopia ?
A. The ability of accommodation of the eye usually decreases with ageing. This defect is called presbyopia.
12. What is the use of keeping food in air tight containers ?
A. 1) When fats and oils are oxidised they became rancid. Their smell and taste changes.
2) Keeping food in air tight containers helps to slow down oxidation process.
13. Represent the molecule H₂0 using Lewis notation.

14. Name the product other than water formed on burning of ethanol in air.
A. Carbondioxide (C0₂)

                                                               SECTION – III

Group – A
15. Suggest an experiment to prove that the rate of evaporation of a liquid depends on its surface area and vapour already present in surrounding air.
A. Aim : To prove that rate of evaporation of liquid depends on its surface area. Apparatus : Two dishes of different surface area and spirit.
Procedure :
1). Take a small quantity of spirit in two dishes separately.
2) Keep the dishes under the fan and switch on the fan.
3) After some time observe the quantity of spirit in both dishes.
4) It is proved that the dishes contain larger surface area of spirit is fastly evaporated.
5) So, the rate of evaporation of a liquid depends on its surface area.
16. Write the working of optical fibres and also their uses in our daily life.
A. Working of optical fibres :
1) Total internal reflection is the basic principle for working of optical fibre.
2) Figure shows the principle of light transmission by an optical fibre.

3) Because of the small radius of the fibre, light going into it makes a nearly glancing incidence on the wall.
4) The angle of incidence is greater than the critical angle and hence total internal reflection takes place. The light is thus transmitted along the fibre.
Uses:
1) Optical fibres are used in endoscopy to see the internal organs like stomach, intestines, etc.
2) Optical fibres are used in transmitting communication signals through light pipes.
17. Explain Kirchhoff’s laws with examples.
A. Kirchhoff’s laws
1) Junction Law : At any junction point in a circuit where the current can divide, the sum of the currents into the junction must equal the sum of the currents leaving the junction.

From the above figure, according to Junction law we have I1 + I₄ + I₆ = I₅ + I₂ + I₃
2) Loop Law: The algebraic sum of the increases and decreases in potential difference across various components of a closed circuit loop must be zero.

18. Explain the working of AC electric generator with a neat diagram.
A. 1) Consider initially the coil, positioned in such a way that magnetic flux passes through it. When the coil is at rest in vertical position, with side (A) of coil at top position and side (B) at bottom position, no current will be induced in it. In this position, the current in the coil is zero.

2) When the coil is rotated in clockwise direction, current will be induced in it flows from A to B. During the first quarter of rotation, the current increases from zero to a maximum and reaches peak value when the coil is in horizontal position.
3) If we continue the rotation of coil, current decreases during second quarter of the rotation and once again becomes zero. When coil comes to vertical position with side B at top and side A at bottom. During second part of the rotation. Current generated follows the same pattern as that in the first half, except that the direc­tion of current is reversed.
4) This current is called Alternating Current (AC).

Group – B
19. What is an exothermic reaction ? Why does respiration considered as an exothermic reaction ? Explain.
A. Exothermic reaction : A reaction in which heat energy is released by the reactants is called an exothermic reaction.
1) By the respiration oxygen is taken in and it is combine with glucose which is in blood.
2) This glucose combine with oxygen in the cells of our body and releases energy, C0₂ and water which helps to do the various works.
3) C₆H₁₂0₆ + 60₂ —» 6C0₂ 4- 6H₂0 + energy.
4) In this reaction energy is also released, hence it is an exothermic reaction.
20. Compounds such as alcohol and glucose contain hydrogen but are not categorized as acids. Describe an activity to prove it.
A.1) Prepare solutions of glucose, alcohol and hydrochloric acid etc.
2) Connect two different coloured electrical wires to graphite rods separately in a 100 ml beaker as shown in figure.
3) Connect free ends of the wire to 230 volts AC plug and complete the circuit as shown in the figure, by connecting a bulb to one of the wires.

4) Now pour some dil. HCl in the beaker and switch on the current.
5) You will notice that the bulb glows in acid solution (HCl). Because Acid solutions produce H⁺ ions and these ions one responsible for the flow of current.
5) Repeat same activity with glucose and alcohol solutions separately. In glucose and alcohol solutions the bulb did not glow. This indicate the absence of ions in these solutions.
Hence glucose and alcohol are not categorized as acids.
21. What is hybridisation ? Explain the formation of BF₃ molecule using hybridisation.
A. Hybridisation : It is a phenomenon of inter mixing of atomic orbitals of almost equal energy which are present in the outer , shells of the atom and their reshuffling or redistribution into the same number of orbitals but with equal properties like energy and shape. This process is called hybridisation.
Formation of BF₃ molecule :

1. There is an inter-mixing of 2s, 2p_x, 2p_y orbitals and their redistribution into three identical orbitals called sp² hybrid orbitals.
2. It is suggested that excited ‘B’ atom undergoes hybridisation
3. As it forms three identical B-F bonds in BF₃.
4. The excited electronic configuration of _SB is Is² 2s¹ 2p_x ¹ 2p h
5. ₅B has electronic configuration 1s² 2s² 2p_x ¹
6. For three sp² orbitals to get separated to have minimum repulsion the angle between any two orbitals is 120° at the central atom and each sp² orbital gets one electron.

7. Now three fluorine atoms overlap their 2p_z orbitals containing unpaired electrons (F₉ Is² 2s² 2p_x² 2p_y² 2p_z^!) the three sp² orbitals of’B’ that contain unpaired electrons to form three ssp²-p bonds.
22. Suggest a chemical test to distinguish between ethanol and ethanoic acid and explain the procedure.
A. 1) Take ethanol and ethanoic acid in two different test tubes.
2) Add nearly 18m of sodium bicarbonate (NaHC0₃) to each test tube.
3) Lots and lots of bubbles and foam will be observed from the test tube containing ethanoic acid. This is due to release of C0₂.
NaHC0₃ + CH3COOH ® CH₃COONa + H₂0 + C0₂
4) Ethanol will not react with sodium bicarbonate and thus we won’t observe any change in the test tube containing ethanol.
Thus we can seperate ethanol from ethanoic acid.

                                                                     SECTION – IV
23.Show the formation of image with a ray diagram when an object is placed on the principal axis of a concave mirror away from the centre of curvature.
A. When the object is placed away from the centre of curvature on the principal axis, the image will form between C and F

OJ               =    Object
JM              =    Parallel incident beam
F                 =    Focus
P                    Polo
MG, M’G =     Reflected rays
IG               =    Image (Real, inverted and
diminished.

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