![]() SCIENCE X : Sample Question Papers (March 2013) Sample Paper - 01 Sample Paper - 02 Sample Paper - 03 Sample Paper - 04 Sample Paper - 05 SAMPLE PAPERS FOR SCIENCE with solution (KV) Science Paper- I Science Paper- II Science Paper- III Science Paper -IV Science Paper -V 2 Marks Questions [2 x 5 = 10 ]
1. An element has electronic configuration 2, 8, 3. What is the atomic number of this element? To which (i) group and (ii) period this element belong? 2. State the positions of (i) isotopes of the same element and (ii) hydrogen in the Modern Periodic Table. 3. How does the tendency to gain electrons change as we go down the 16th group of periodic table? Why? 4. Give reasons for the following : (a) Lithium atom is smaller than sodium atom. (b) Chlorine (atomic number 17) is more electro negative than sulphur (atomic number 16) 5. (a) State the Modern Periodic Law. (b) Name the element which has twice as many electrons in its second shell as in its first shell. Write its electronic configuration also. 3 Marks Questions [ 3 x 5 = 15 ] 1. An element X belongs to group 17 and third period of the periodic table. (a) Write electronic configuration of the element. What is its valency? (b) Predict its nature, whether it is a metal or non-metal. (c) Give the formula of the compound formed when it combines with an element Y having valency three. 2. Three elements A, B and C have atomic number 7, 8 and 9 respectively. (a) What would be their positions in the Modern Periodic Table (Mention group and period both)? (b) Arrange A, B and C in the decreasing order of their size. (c) Which one of the three elements is most reactive and why? 3. (a) The elements of the second period along with their atomic number in parenthesis are given below : B (5), Be (4), O (8), N (7), Li (3), C (6), F (9) (i) Arrange them in the same order as they are in the periodic table. (ii) Which element has the (i) largest (ii) smallest atom? (b) Why does the atomic radius change as we move from left to right in a period? 4. (a) How is the valency of an element determined from its position in the periodic table? (b) Magnesium has atomic number 12. To which (i) group (ii) period of the periodic table does it belong? (c) The valency of all the elements in a group is same. Why? 5. A part of the periodic table has been shown below : Answer the following questions on the basis of position of elements in the above table. (a) Which element is a noble gas? Give reason. (b) Which element is most electronegative? Give reason. (c) Write the electronic configuration of (i) B and (ii) E. Group → 1 2 13 14 15 16 17 18 Period ↓ 1 2 A C E G 3 B D F 5 Marks Questions [ 5 x 1 = 5] 1. What are electron affinity and ionization energy? How they are vary in group and periods in modern periodic table? OR, Two elements ‘A’ and ‘B’ belong to group 1 and 2 respectively in the same period. Compare them with respect to :– (a) Number of valence electrons (b) Valency (c) Metallic character (d) Size of atom (e) Formulae of their oxides. Solution : 2 Marks Questions 1. Atomic number is 13. (i) Group – 13 (ii) 3rd Period 2. (i) All isotopes have same atomic number. So they have same place for a particular element. (ii) Hydrogen is not given a definite position. It was placed in group I A and group VII B in the Modern Periodic Table. 3. As we go down the 16th group of periodic table, tendency to gain electrons decreases because the electronegative character (non metallic character) of elements gradually decreases. 4. As we move down in a group, an electron shell is added after every change of period. Sodium has one more shell than lithium. Li (3) = 2, 1 Na (11) = 2, 8, 1 Due to less number of shells, lithium atom is smaller than sodium atom. (b) The nucleus of chlorine has more tendency to attract an extra electron than the nucleus of sulphur because chlorine needs only one 1 electron to complete its shell. Hence, chlorine is more electronegative than sulphur. 5. (a) Modern Periodic Law : Properties of elements are the periodic function of their atomic numbers. (b) Carbon (atomic number 6) has twice electrons in its second shell as compared to first shell because its electronic configuration is 2, 4. 3 Marks Questions 1. (a) Electronic configuration — 2, 8, 7. Its valency is one. (b) It is a non-metal (c) YX3 2. (a) A, B and C occupy 2nd period of periodic table and 15, 16 and 17 groups respectively. (b) A > B > C because atomic size decreases as we move from left to right across a period. (c) C has electronic configuration 2, 7. It needs only one electron to complete its outermost shell. So it is more reactive. 3. (a) (i) Li (3), Be (4), B (5), C (6), N (7), O (8), F (9). (ii) Li is largest and F is smallest atom. (b) As one moves from left to right across a period, there is a consecutive addition of a proton in the nucleus that increases the positive charge, which consequently pulls the extra nuclear electrons in the outermost shell inward. Thus, atomic size decreases with the increase in the number of protons as one moves from left to right in a period. 4. (a) The valency of an element with respect to hydrogen increases from 1 to 4 and then falls to 1 as in 2nd period elements. The valency of elements with respect to oxygen increases from 1 to 7 for 3rd period elements. (b) (i) 2nd group (ii) 3rd period (c) In a group all elements have same number of electrons in their outermost shell. So they have same valency.
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Question Papers for Board Examinations 2012:(Class X Commerce
SET1 SET2 English Communicative SET1 SET2 SET3 English Language and Literature SET1 SET2 SET3 Foundation of Information Tecnology SET1 Hindi(Course A) SET1 SET2 SET3 Hindi(Course B) SET1 SET2 SET3 Mathematics SET1 SET2 SET3 Science SET1 SET2 SET3 Social Science SET1 SET2 SET3 Urdu(CourseA) SET1 ' Urdu (Course B) SET1
X BOARD SOLVED QUESTIONS Papers 2012
Section – A 1. In fig. AP, AQ and BC are tangents to the circle . If AB = 5 cm , AC = 6 cm and BC = 4cm then length of AP is ( in cm) (A) 7.5 (B) 15 (C) 10 (D) 9 Ans: (A) 7.5 2. A solid right circular cone is cut into two part at the middle of its height by plane parallel to its base. The ratio of volume of the smaller cone to the whole cone is (A) 1:2 (B)1:4 (C) 1: 6 (D) 1: 8 Ans: (D) 1: 8 3. A kite is flying at height of 30m from the ground. The length of string from the kite at the ground is (A) 450 (B)300 (C)600 (D)900 Ans: (B) 4. In fig. P(5,-3),q(3,y) are the points of trisections of the line segments joining A(7,-2) and B(1,-5)Then y equals (A) 2 (B)4 (C)-4 (D)-5/2 Ans: (C)-4 5. Card bearing numbers 2,3,4--------------,11 are kept in a bag . A card is drawn at random from the bag . The probability of getting a card with prime number is (A) 1/ 2 (B) 2/5 (C) 3/10 (D) 5/9 Ans: (A) 1/ 2 6. The distance of point (-3,4) from the x axis is (A) 3 (B) -3 (C) 4 (D) 5 Ans: (C) 4 7. The circumference of circle is 22cm .The area of its quadrant is (A) 77/2 (B) 77/4 (C) 77/8 (D) 77/16 Ans: (C) 77/8 8. From a point Q , 13 cm away from the centre of circle ,the length of tangent PQ to the circle is 12 cm . The radius of circle (in cm ) (A) 25 (B) 313 (C) 5 (D) 1 Ans: (C) 5 9. If nth term of AP is (2n+1), then the sum of its first three term (A) 6n + 3 (B) 15 (C) 12 (D) 21 Ans: (B) 15 10. The root of the quadratic equation 2x2 - x – 6 = 0 (A) -2 , 3/2 (B) 2, -3/2 (C) -2 ,-3/2 (D) 2, 3/2 Ans: (B) 2, -3/2 Download full Paper (Allahabad Region)X BOARD SOLVED QUESTION BY http://www.meritnation.com DELI REGION 2012_class_10_set-1_section-A Download File 2012_class_10_set-1_section-B Download File 2012_class_10_set-1_section-c DownloadFile 2012_class_10_set-1_section-D Download File English Assignments Class X Sample paper SA_II_2014 Passage 1 Su means number and duko means single. The game of Sudoku has many similarities to the game of life.the game consists of 9*9 grid divided into 3*3 boxes in which a few numbers called “given” – the number of given varies between 17 and 30 for a puzzle to be reasonably viable-are already in place. In life, too,you start with a given set of notions and then work from thereon. In Sudoku, you need to follow a set of rules to build up the grid, filling each row, column and box with numbers ranging from 1 to 9, so much like in life where you have to go on your way without antagonizing anyone else. Respect every number (person) and things would be fine. While trial or error may or may not work the correct technique is in eliminating numbers that don’t fit in a particular box. In Sudoku , the arrangement of the given numbers is symmetrical. This is instructive in life, on how to maintain steadfast faith, poise and equanimity despite situations when everything turns topsy-turvy. There is a subtle difference between the two as well. Make a mistake and you can erase it and begin all over again in Sudoku. Not so in life. You can learn a lesson though, and avoid making the same mistake in future. Answer the following questions by selecting the most appropriate option from the ones given below- 1. The given numbers in Sudoku are comparable to the ………….. in life. a) rules b) notions c) people d) respect 2. In Sudoku, by eliminating numbers that do not fit we a) keep reducing errors to succeed in life b) keep adding the chances to solve the puzzle c) restrict our choices d) open new avenues 3. In life , symmetry is maintained through a)patience and hardwork b) balance inspite of hardships c) constant trust d) friends and enemies 4. In life we can learn from our mistakes but we cannot a) begin afresh b) undo them c) relive them d) commit them again 5. To ‘antagonise’ in the passage means a) to be determined b) to be noticeable c) to please d) to make someone angry Passage 2 A LITTLE GRAIN OF GOLD I had gone abegging from door to door in the village path when thy golden chariot appeared in the distance like a gorgeous dream and I wondered who was this king of all kings! My hopes rose high and me thought my evil days were at an end, and I stood waiting for alms to be given unasked and for wealth scattered on all sides in the dust. The chariot stopped where I stood. Thy glance fell on me and thou camest down with a smile. I felt that the luck of my life had come atlast. Then of a sudden thou didst hold out thy right hand and say,”What hast thou to give to me?” Ah, what a kingly jest was it to open thy palm to a begger to beg! I was confused And stood undecided and then from my wallet and slowly took out the least little grain of corn and gave it to thee. But how great my surprise when at the day’s end I emptied my bag on the floor to find at least a little grain of gold among the poor heap. I bitterly wept and wished that I had the heart to give them all. Choose the most appropriate option: 1)”The begger was happy to see the golden chariot because: a) he thought there was a king of kings b) he expected unasked arms c) the chariot was beautiful d) the chariot was made of gold 2)His hopes rose high because: a) it was king of kings b) the chariot was made of gold c)the king alighted the chariot happily d) he would get much wealth as alms and his evil days would end soon 3) The begger thought begging in gold chariot was a a) positive thing b) royal joke c) undecided begging d) great surprise 4) He wept bitterly because he thought he should have: a) given him all that he had b) more wealth c) unexpected alms d) gold 5)After emptying his bag he was surprised too see: a) a big heap of grains b) a small grain of gold c) a grain of corn d) a glance Change the following sentences into indirect speech 1. She said,” I can solve my problem.” 2. My mother said,” I was cooking when she came.” 3. The teacher said to the boys,” You can go to your houses.” 4. He said,” It may rain today.” 5. The teacher said,” The sun sets in the west.” 6. The monitor said,” Some boys were gossiping while others were reading.” 7. The man said,” If my children were older, I would go to London.” 8. He said to me,” Do you feel better?” 9. The traveler said to the inkeeper,” Is there any room vacant with you?” 10. The servant said to his master,” Did you receive my letter?” 11. The teacher said to the boy,” Were you not absent yesterday?” 12. The boy said to the traveler,” What can I do for you?” 13. The factory owner said to the worker,” How much money do you require?” 14. The teacher said to the class,” Look at the blackboard.” 15. Ram said to his friend,” Please wait here till I return.” 16. He said,” Pardon me this time, mother.” 17. The owner said to the servant,” Go to the bazaar and bring sugar.” 18. The wolf said,” How clever I am!” 19. The beggar said,” Alas! I have lost my purse.” 20. The old man said,” Oh dear! I have just missed the train.” 21. The people said,” Long live the king.” 22. The teacher said to Angela,” How did you guess the correct answer?” 23. The shopkeeper said to me,” We received this goods only two days ago.” 24. Aditya said to you,” Your painting will win you the first prize.” 25. Mrs. Acharya said,” Nikki is very proud of her dog Rover because it follows her wherever she goes.” ![]()
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