SUMMATIVE ASSESSMENT I TENTH CLASS GENERAL SCIENCE PHYSICAL SCIENCE MODEL PAPER PAPER I (ENGLISH VERSION)

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1 BOARD OF SECONDARY EDUCATION (TELANGANA) SUMMATIVE ASSESSMENT I TENTH CLASS GENERAL SCIENCE PHYSICAL SCIENCE MODEL PAPER PAPER I (ENGLISH VERSION) Time: 2 hrs. 45 mins. PART A & B Maximum Marks: 40 INSTRUCTIONS: 1. Read the whole question paper and understand every question thoroughly without writing anything and 15 minutes of time is allotted for this. 2. Answer the questions under PART A on a separate answer book. 3. Write the answers to the questions under PART B on the question paper itself and attach it to the answer book of PART A Time: 2 hrs. PART A Marks: 35 Note: i) PART A comprises of three Sections I, II and III. ii) All questions are compulsory. iii) There is no overall choice. However there is Internal Choice to questions under Section III. SECTION - I INSTRUCTIONS: i) Answer ALL the questions. ii) Each question carries ONE mark. iii) Write the answers in 1 2 sentences. 7 1 = 7 1. Which ray behave similarly when it passes through a concave and convex mirrors? 2. Among Na +, Mg 2+ and Al 3+ write increasing order of ionic radii. 3. What are the various phenomenon involved in formation of rainbow with a water drops? 4. Give example for acidic, basic and neutral salts. 5. Addition of Dry CaO to the water, what type of thermo chemical reaction taken place? 6. Draw Bohr Sommer feld model of an atom when n = Due to the scattering of which molecules present in atmosphere are responsible for appear sky in blue colour? SECTION - II INSTRUCTIONS: i) Answer ALL the questions. ii) Each question carries TWO marks. iii) Answer the questions in 4 5 sentences. 6 2 = Complete and balance the following equations. i) C 3 H 8 +O ii) CO 2 +H 2 O MP-TS ONLINE-18

2 9. The gas 'X' which is obtained at the anode during the electrolysis of sodium chloride solution produces a compound 'Y' on reacting with dry calcium hydroxide. The compound 'Y' is used for disinfecting drinking water to make it free of germs. Name 'X', 'Y' and write the chemical equation for the reaction between them. 10. Can a convex mirror burn a paper? Why? 11. Complete the table given below. Sub Shell s(l = 0) p (l = 1) d (l = 2) f (l = 3) Number of orbitals Maximum number of electrons 12. Draw a figure to show the behaviour of a parallel beam of rays fall on a concave lens making some angle with principal axis. 13. Write the uses of NaOH. SECTION - III INSTRUCTIONS: i) Answer ALL the questions. ii) Each question carries FOUR marks. iii) There is Internal Choice for each question. Only one option from each question is to be attempted. iv) Answer each question in 8 10 sentences. 4 4 = An object is kept at a distance of 20 cm infront of a concave mirror. The focal length of mirror is 30 cm. Then a) What is image distance? b) What is the magnification in this case? The near point of a person suffering from hypermetropia in 75 cm calculate the focal length and power of the lens required to enable him to read the news paper which is kept at 25 cm from the eye. 15. Mention and explain the factors of influencing Ionization energy. Explain how does the quantum numbers be useful to understand atomic structure? 16. How do you verify experimentally that the focal length of a convex lens is increased when it is kept in water? List out the materials used in an experiment to prove when acid reacts with metal evolves hydrogen gas. Describe the experimental process.

3 17. The electron affinity values of elements VII A and VI A groups are given in the table with the help of that answer the questions given below. Group VII A (Halogens) VIA (Chalcogens) i) What are the units of electron affinity? Electron affinity values in kj / mole F( 328), Cl( 349), Br( 325), I( 295), At( 270) O( 141), S( 200), Ge( 195), Te( 190), Po( 174) ii) Arrange the elements of chalcogen group as per the decreasing order of their electron affinity values. iii) How do the electron affinity values vary in a group and in a period? iv) What happens to the energy value when electron affinity values will be either positive or negatives? Complete the following table for the positions of object placed as in the different places on the principle axis of a concave mirror. S.No. Position of the Position of Enlarged/ Erect/ Real/ object image Diminished Inverted Virtual 1. Between Pole and F 2. At F 3. Between F and C 4. At C

4 Time: 30 Minutes PART B Marks: 5 INSTRUCTIONS: i) Answer ALL the questions. 1 ii) Each question carries mark. 2 iii) Answers are to be written in questions paper only. iv) Marks will not be awarded in any case of over writing, rewriting or erased answers. v) Write the CAPITAL LETTER (A, B, C, D) showing the correct answer for the following 1 questions in the brackets provided against them. 10 = The components of baking powder are ( ) A) Na 2 CO 3, NaHCO 3 B) NaHCO 3, NaOH C) Na 2 CO 3, Ca(H 2 PO 4 ) 2 D) NaHCO 3, Ca(H 2 PO 4 ) 2 and Starch 19. Which of the following is violation of Paulis exclusion principle ( ) A) B) 2s 2p 2s 2p C) D) 2s 2p 2s 2p 20. An object is placed 12 cm from a converging lens of focal length 12 cm. The image is formed at a distance of ( ) A) 6 cm B) 12 cm C) 36 cm D) Infinity 21. Match the following. ( ) Group 1) VIII A a) ns 2 np 4 2) VI A b) ns 1 3) III A c) ns 2 np 6 4) I A d) ns 2 np 1 Valence shell configuration A) 1 a, 2 c, 3 b, 4 d B) 1 d, 2 c, 3 a, 4 b C) 1 c, 2 a, 3 d, 4 b D) 1 b, 2 a, 3 d, 4 c 22. On mixing aqueous solutions of barium chloride and sodium sulphate we observe that ( ) A) A white precipitate is formed immediately B) A transparent solution is formed C) A colour less gas is evolved D) A pungent smelling gas evolves with brisk effervescence

5 23. Strontium chloride produces... colour flame. ( ) A) red B) yellow C) blue D) green 24. Which of the following ray diagram is not correct ( ) A) B) C) D) C 25. To which boundary surface diagram of d orbital it indicates ( ) y C C C F F F F x A) d xy B) d yz C) d z 2 D) d x 2 y Which lens is used in the making of microscope ( ) A) Concave B) Convex C) Concave, Convex D) Plano Convex 27. Antacids... excess acids produced in the stomach ( ) A) increases B) decreases C) neutralise D) None of these

ANSWERS PART A SECTION I 1. Which ray behave similarly when it passes through a concave and convex mirrors? A: The ray which passes along the principle axis. 2.

6 ANSWERS PART A SECTION I 1. Which ray behave similarly when it passes through a concave and convex mirrors? A: The ray which passes along the principle axis. 2.- Among Na +, Mg 2+, Al 3+ write increasing order of ionic radii. A: Al 3+ < Mg 2+ < Na + 3. What are the various phenomenon involved in formation of rainbow with a water drops? A: Refraction, Dispersion of Light, Total internal refraction. 4. Give example for acidic, basic and neutral salts. A: NaCl is neutral salt CH 3 COONa is basic salt NH 4 Cl is acidic salt 5. Addition of Dry CaO to the water, what type of thermo chemical reaction taken place? A: Exothermic reaction.? 6. Draw Bohr Sommer feld model of an atom when n = 2. A: l = 1 l = 0 n = 2 7. Due to the scattering of which molecules present in atmosphere are responsible for appear sky in blue colour? A: N 2 and O 2 SECTION II 8. Complete and balance the following equations. i) C 3 H 8 +O ii) CO 2 +H 2 O A: i) C 3 H O 2 3 CO H 2 O ii) 6 CO H 2 O C 6 H 12 O O 2

7 9. The gas 'X' which is obtained at the anode during the electrolysis of sodium chloride solution. Produces a compound 'Y' on reacting with dry calcium hydroxide. The compound 'Y' is used for disinfecting drinking water to make it free of germs. Name 'X', 'Y' and write the chemical equation for the reaction between them. A: i) 'X' is chlorine and 'Y' is bleaching powder ii) Chemical equation is Ca(OH) 2 + Cl 2 CaOCl 2 + H 2 O Dry slaked lime + Chlorine Bleaching powder + Water 10. Can a convex mirror burn a paper? Why? A: The rays coming parallel to principal axis after reflection diverge from the mirror. So we cannot burn a paper by using a convex mirror. 11. Complete the table given below. Sub Shell s (l = 0) p (l = 1) d (l = 2) f (l = 3) Number of orbitals Maximum number of electrons A: Sub Shell s(l = 0) p (l = 1) d (l = 2) f (l = 3) Number of orbitals Maximum number of electrons 12. Draw a figure to show the behaviour of a parallel beam of rays fall on a concave lens making some angle with principal axis. A: C 1 F 1 F 2 C 2

8 13. Write the uses of NaOH. A: i) It is used in de greasing the metals. ii) It is used in the preparation of soaps, detergents, artificial threads. SECTION III 14. An object is kept at a distance of 20 cm infront of a concave mirror. The focal length of mirror is 30 cm. Then a) What is image distance? b) What is the magnification in this case? A: a) Object distance (u) = 20 cm Image distance (v) =? Focal length (f) = 30 cm Mirror Formula = + f u v = + 30 v ( 20) = 30 v = v = v = v = v 60 v = 60 cm v b) Magnification (m) = u m = = = m = +3 cm + indicates image is virtual, erect. Q. The near point of a person suffering from hyper metropia in 75 cm. Calculate the focal length and power of the lens required to enable him to read the news paper which is kept at 25 cm from the eye. A: u = 25 cm v = 75 cm

9 1 1 1 = f v u 1 1 = 75 ( 25) 1 1 = = = = f f = 2 f = 37.5 cm Thus the focal length of the Convex lens required is cm 100 p = f 100 p = 37.5 p = D 15. Mention and Explain the factors of influencing Ionization energy? A: Factors effect the Ionization energy: i) Nuclear Charge: More the nuclear charge more is the ionization energy. e.g.: Between 11 Na and 17 Cl Chlorine atom has more ionization energy. ii) Screening effect or Shielding effect: More the shell with electrons between the nucleus and the valence shell, they act as screens and decreases nuclear attraction over valence electron. This is called the screening effect. More the screening effect less is the ionization energy. e.g.: Between 3 Li and 55 Cs, the element 55 Cs with more inner shells has less ionization energy. iii) Penetration power of the orbitals: Orbitals belonging to the same main shell have different piercing power towards the nucleus, for example 4s > 4p > 4d > 4f in the Penetration. Therefore, it is easier to remove 4f electron than 4s. iv) Stable Configuration: It is easier to remove one electron from 8 O (1s 2 2s 2 2p 4 ) than 7 N (1s 2 2s 2 2p 3 ). This is because, 7 N has stable half filled configuration. v) Atomic radius: More the atomic radius, less is the ionization energy. Therefore, ionization energy of 'F' is greater than that of 'I'.

10 Q. Explain how does the quantum numbers be useful to understand atomic structure. A: The quantum numbers describe the space around the nucleus where the electrons are found and also their energies. Principal quantum number (n): i) The principal quantum number is related to the size and energy of the main shell. ii) 'n' has positive integer values of 1, 2, 3,... iii) As 'n' increases, the shells become larger and the electron in those shells are further from the nucleus. iv) An increases in 'n' also means higher energy. n = 1, 2, 3,... are often represented by the letters K, L, M... For each 'n' value there is one main shell Shell K L M N n The angular momentum quantum number (l): i) l has integer values from 0 to n 1 for each value of 'n'. Each 'l' value represents one sub shell ii) Each value of 'l' is related to the shape of a particular sub shell in the space around the nucleus. iii) The value of 'l' for a particular sub shell is generally designated by the letters s, p, d... as follows l Name of the sub shell s p d f l = 0 means s orbital l = 1 means p orbital l = 2 means d orbital The magnetic quantum number (m l ) : i) The magnetic quantum number (m l ) has integer values between l and +l including zero. ii) Thus for a certain value of l, there are (2l + 1) integer values of m l as follows. l, ( l + 1),... 1, 0, 1... (+l, 1), +l iii) These values describe the orientation of the orbital in space relative to the other orbitals in the atom. Spin quantum number (m s ): i) This quantum number refers to the two possible orientations of the spin of an electron, one 1 1 clockwise direction ( + ) and the other anti clockwise direction ( ). 2 2

16. How do you verify experimentally that the focal length of a convex lens is increased when it is kept in water? A: Aim: To verify change in focal length of a lens when it is dipped in water.

ii) Take a glass jar whose height is twice that of focal length of lens. iii) Take a black coloured stone and place it in a jar.

11 16. How do you verify experimentally that the focal length of a convex lens is increased when it is kept in water? A: Aim: To verify change in focal length of a lens when it is dipped in water. Apparatus: Convex lens of known focal length, Circular lens holder, Tall cylindrical glass tumbler, Black stone, Water. Procedure: i) Take a convex lens whose focal length is known. ii) Take a glass jar whose height is twice that of focal length of lens. iii) Take a black coloured stone and place it in a jar. iv) Take a circular holding lens and view the stone keeping it at a distance less than focal length. And go on increasing the distance between the stone and lens. You can view the stone till the distance between stone and lens is equal to focal length. v) After the focal length distance you can't view the stone. vi) Now pour water in the glass tumbler and view the stone. By placing the lens at a distance which we did not view the stone. vii) Now you can view the stone clearly from this experiment and we can conclude that the focal length goes on increasing with respective to media. Q. List out the materials used in an experiment to prove when acid reacts with metal evolves hydrogen gas. Describe the experimental process. A: Materials required: Test tube, Delivery tube, Glass trough, Candle, Soap water, dil. HCl, Zinc granules and Stand. Procedure: lens stone Circular lens holder i) Set the apparatus as show in figure. ii) Take about 10 ml of dilute HCl in a test tube and add a few Zinc granules to it.

12 iii) We observe a gas is evolved from the Zinc granules. iv) Pass the gas being evolved through the soap water. v) We observe some bubbles formed in the soap solution. vi) Bring a burning candle near the gas filled bubble. vii) The candle turn of with a pop sound. viii) The pop sound indicates that the gas evolved is Hydrogen. 2 HCl + Zn ZnCl 2 + H 2 Acid + Metal Salt + Hydrogen ix) Repeat this experiment with H 2 SO 4, HNO 3 etc. x) From the above experiment we conclude that hydrogen gas is produced when acid reacts with metals. 17. The electron affinity values of elements VII A and VIA groups are given in the table with the help of that answer the questions given below. Group VII A (Halogens) VI A (Chalcogens) Electron affinity in kj/mole i) What are the units of electron affinity? A: kj/mole F( 328), Cl( 349), Br( 325), I( 295), At( 270) O( 141), S( 200), Ge( 195), Te( 190), Po( 174) ii) Arrange the elements of chalcogen group as per the decreasing order of their electron affinity values. A: O( 141), Po( 174), Te( 190), Ge ( 195), S( 200) iii) How do the electron affinity values vary in a group and in a period? A: Electron affinity values increases from left to right in a period. Electron affinity decreases from top to bottom in a group. iv) What happens to the energy value when electron affinity values will be either positive or negative? A: Negative sign for energy value in table indicates that energy is liberated or last, and the positive sign tells that the energy is gained or absorbed. Q. Complete the following table for the positions of object placed as in the different places on the principle of axis of a concave mirror. S.No. Position of the Position Enlarged/ Erect/ Real/ Object of the image Diminished Inverted Virtual 1 Between pole and F 2 At F 3 Between F and C 4 At C

13 A: S.No. Position of the Position Enlarged/ Erect/ Real/ Object of the image Diminished Inverted Virtual 1 Between pole and F Behind the mirror Enlarged Erect Virtual 2 At F at infinity 3 Between F and C Beyond C Enlarged Invested Real 4 At C On C Same size Inverted Real PART B ANSWERS 18 D; 19 C; 20 D; 21 C; 22 B; 23 A; 24 D; 25 D; 26 B; 27 C. Writer: K. Gagan Kumar

BOARD OF SECONDARY EDUCATION (TELANGANA) SUMMATIVE ASSESSMENT - I TENTH CLASS GENERAL SCIENCE PHYSICAL SCIENCE MODEL PAPER

BOARD OF SECONDARY EDUCATION (TELANGANA) SUMMATIVE ASSESSMENT - I TENTH CLASS GENERAL SCIENCE PHYSICAL SCIENCE MODEL PAPER PAPER - I (ENGLISH VERSION) Time: 2 hrs. 45 mins. PART - A& B Maximum Marks: 40