Q. ab+bc+ca=0 find value 1/(b2ac ) + 1/(c2ab) + 1/(a2bc)Solution: ab+bc+ca=0 find value 1/(a2bc ) + 1/(c2ab) + 1/(a2bc) Put ac = ab + bc ; ab = ac+ bc and bc =ab + ac you get : 1/(a2bc (ab + bc + ca)/[(a+b+c)(abc)] put, ab+bc+ca=0 you get value = 0/[(a+b+c)(abc)] = 0 Q. A class of 20 boys and 15 girls is divided into n groups so that each group has x boys and y girls. Find x ,y and n.
Sol: n(x+y) = 20 + 15 = 35 Total boys = nx = 20 Þ nx = 2 x 10 = 4 x 5 = 10 x 2 Similarly, Total girls = ny = 15 Þ 3 x 5 The possible value of n may be n = 5 x = 4 and y = 5 OR, Hcf of 20 and 15 is 5 Þ No. of group will be n =5 then Total girls = ny = 15 Þ 3 x 5 The possible value of n may be n = 5 x = 4 and y = 5 Q. The pair of equations y=0 and y= 5 has 1.one solution 2.two solutions 3.infinitely many solutions 4.no solution Ans: o.x + y = 0 0.x + y = 5 therefore, a1/a2 = b1/b2 ≠ c1/c2 Þ The pair of equations y=0 and y= 5 has no solution Q. If secA + tanA = 1/x find the value of SecA and tanA Q. There are 20 cars and motorcycle in a parking lot. If there are 56 wheels together find the no of cars and motorcycles Ans: Le t the no. of car is x then no. of motorcycle will be (20x) A/Q, 4x + 2(20x) = 56 Þ x = 8 the no. of car is x = 8 then no. of motorcycle will be (20x) = 208 = 12 Q. If constant term in Quardatic polynomial is zero ,then prove that one of its zero is zero Sol: let the quadratic polynomial be P(x) = a x2 + bx + c Þ P(x) = a x2 + bx [since the constant term is zero] Now P(0) = 0 + 0 = 0 Thus, 0 is one zero of p(x). Q. If p(x) = ax2 + bx +c and a + c = b, then one of the zeroes is (a) b/a (b) c/a (c) c/a (d) b/a Sol: c/a Q. if asin2q + bcos2 q = c , then sow that cot2q = (ca)/(bc) ab + ac ab + ac (ab + bc + ca)/[(a+b+c)(abc)] put, ab+bc+ca=0 you get value = 0/[(a+b+c)(abc)] = 0 Q. A class of 20 boys and 15 girls is divided into n groups so that each group has x boys and y girls. Find x ,y and n. Sol: n(x+y) = 20 + 15 = 35 Total boys = nx = 20 Þ nx = 2 x 10 = 4 x 5 = 10 x 2 Similarly, Total girls = ny = 15 Þ 3 x 5 The possible value of n may be n = 5 x = 4 and y = 5 OR, Hcf of 20 and 15 is 5 Þ No. of group will be n =5 then Total girls = ny = 15 Þ 3 x 5 The possible value of n may be n = 5 x = 4 and y = 5 Q. The pair of equations y=0 and y= 5 has 1.one solution 2.two solutions 3.infinitely many solutions 4.no solution Ans: o.x + y = 0 0.x + y = 5 therefore, a1/a2 = b1/b2 ≠ c1/c2 Þ The pair of equations y=0 and y= 5 has no solution Q. If secA + tanA = 1/x find the value of SecA and tanA Q. There are 20 cars and motorcycle in a parking lot. If there are 56 wheels together find the no of cars and motorcycles Ans: Le t the no. of car is x then no. of motorcycle will be (20x) A/Q, 4x + 2(20x) = 56 Þ x = 8 the no. of car is x = 8 then no. of motorcycle will be (20x) = 208 = 12 Q. If constant term in Quardatic polynomial is zero ,then prove that one of its zero is zero Sol: let the quadratic polynomial be P(x) = a x2 + bx + c Þ P(x) = a x2 + bx [since the constant term is zero] Now P(0) = 0 + 0 = 0 Thus, 0 is one zero of p(x). Q. If p(x) = ax2 + bx +c and a + c = b, then one of the zeroes is (a) b/a (b) c/a (c) c/a (d) b/a Sol: c/a Q. if asin2q + bcos2 q = c , then sow that cot2q = (ca)/(bc)
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Contents: 1. Thrust and Pressure 2. Pressure in Fluids 3. Buoyancy 4. Why objects sink or Float when placed on surface of water? 5. Archimedes Principle 6. Relative Density Learning Objectives: The students will: 1. Understand the difference between Thrust and Pressure. 2. Apply Pressure to daily life. 3. Explain Pressure in fluids. 4. Understand Buoyancy. 5. Understand and explain Archimedes Principle. 6. Applies Archimedes Principle on floating objects. 7. Understand relation between Density of a Solid and Density of a Liquid. Key Terms : 1. Thrust 2. Pressure 3. Pascal 4. Buoyancy 5. Archimedes Principle 6. Relative Density LIST OF PRACTICALS 1. To determine the density of a solid (denser than water) by using spring balance and a measuring cylinder. 2. To establish the relation between loss in weight of a solid when fully immersed in (i) tap water (ii) strongly salty water, with weight of water displaced by it taking at least two different solids. 3. To Calculate the pressure exerted by a wooden block on sand. Download full Study Note for BOARD EXAM [Given below]
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English Communicative SET1 English Language and Literature SET1 Foundation of Information Tecnology SET1 Hindi(Course A) SET1 Hindi(Course B) SET1 Mathematics SET1 Science SET1 Social Science SET1 Model Answers of Board Examination 2012 for Class XII and Class X Download Question Papers of Board Examinations 2013 (CLASS XII) Download 1. What is the largest number that divides 245 and 1029 , leaving remainder 5 in each case? (a) 16 (b) 16 (c) 19 (d) 5 2. If p is a prime number and p divides a2(a is a positive integer),then which of the following is true: (a) p does not divide a (b) p divides a (c) p2 divides a (d) p divides a 3. If ax + by = a2 – b2 and bx + ay = 0,then value of (x +y) is : (a) a2 – b2 (b) b a (c) ab (d) a2 + b2 4. The pair of equation y = 0 and y = 5 has (a) one solution (b) two solution (c) infinitely many solution (d) No solution 5. The length of the diagonal of rhombus are 24cm and 32 cm . The length of the altitude of the rhombus in cm is : (a) 12 (b) 12.8 (c) 19 (d) 19.2 6. Sin 200 Cos 700 + Cos 200 Sin 700 is (a) 2 (b) 1 (c) 0 (d) 2 7. If tan + cot = 2 then tan2 + cot2 is (a) 4 (b) 6 (c) 2 (d) 1 8. If “less than” type and “more than type” of Ogive intersect each other at (20.5,15.5), than the median of the given data is : (a) 36.0 (b) 20.0 (c) 15.5 (d) 5.5
Can (x  2) be the remainder on division of a polynomial p(x) by(2x +3) ? Justify
Answer: No , (x  2) cannot be the remainder on division of a polynomial p(x) by(2x +3) Because degree of remainder must be less than degree of Divisor. Here degree of x2 and 2x3 is same that is 1 Original Paper from CBSE BOARD 1. Find the value of (14641)0.25 [1] 2.Find the value of (xy)3 + (yz)3 + (zx)3 [1] 3. In fig. find the value of x [1] 4. What will be mirror image of (3,4) [1] SECTIONB 5. If z = 0.064 then find the value of (1/z)1/3 [2] [2] 6. without actual calculation find the value of (100)3 –(60)3 –(40)3 [2] 7. In fig AC=XD . C and D are midpoint of AB and XY respectively. Using Euclid’s axiom show that AB = XY [2] 8. In fig, AB = BC and BX = CY . Show that AX = CY State the Euclid’s axiom used. [2] 9. Find the co –ordinates of the vertices of the square ABCD (Side =a) ,taking AB and AD as axes . [2] 10. In given fig. ABCD is rectangle where AB= 8 cm and BC = 6 cm and the diagonal bisect at O.Find the area of shaded reason by heron formula.[2] SECTIONC [3 marks each] Download full paper in pdf click below
[CBSE Original Paper of Sadhana Devi Vidyapith, Samastipur]
1. Draw a diagram to show uniform magnetic field in a given reason? [1] 2. Which is the largest and most prominent part of brain? [1] 3. Why solar cooker painted black from outside? [1] 4. Briefly explain two way to prevent rusting? [2] 5. Write the symbol of cat ion and anion present in MgO. Why do ionic compound have higher melting points. [2] 6. Which common application of Joule heating is used in electric circuit to protect it ? Explain how it is connected with the device? 7. (a)Draw magnetic field line between P and Q. [2] (b) What does the degree of closeness of magnetic field near the pole indicate? 8.Write the balanced equation for the reaction with dill. HCl with [3] (a) Zn metal (b) Na2CO3 (c) NaOH 9.Complete and balance the equations [3] (a) NaCl + NH3 + H2O + CO2 à (b) Na2CO3 + H2O à (c) NaHCO3 + H2SO4 à 10.”Combination reaction is reverse of decomposition reaction” Justify this statement with the help of suitable chemical equation for each. [3] 11.Give one reaction in the favor of followings [3] (a) Metals are good reducing agents (b) CO2 is an acidic oxide (c) Metal evolve hydrogen gas with acid 12. Find the number of electron transferred between two point kept at potential difference of 20V if 40J work is done [3] 13. Calculate which one use more energy a 250W TV set in 1 hr. or a 1200W toaster in 10 min. (Both connected in same source of electricity) [3] 14.(a) V I graph for Nichrome wire is a straight line. Explain the interference for this statement. (b) Potential difference between two point A and B of a conductor is 15V. Current flowing through the conductor AB is 3 A. Calculate the work done when the current flows for 2 sec. [3] 15.Diffrentiate between arteries and veins [3] 16.(i) Identify the phytoharmones used by plant white performing the following functions (a) Cell division in shoot tips (b) Inhibiting growth on approach of unfavorable conditions (ii) List two differences between the movement in “touch me not” plants and movement of shoot towards light. [3] 17. (a) Name four type of metabolic wastes produced by human (b) Name any two excratory organ other than kideney. [3] 18.List three reason due to which biogas is considered as an excellent fuel? [3] 19. Ramu has a piece of land and decided to set up a brick factory on it. His friend shyam persuaded him to change the decision in the interest of village because presence of a factory severely effect the health of villagers as well as agriculture produce of others. Ramu understand the abandon his plan (a) Mention the value exhibited by shyam (b) Explain how these value helped shyam to shave interest of villagers.[5] 20.Three solution A ,B and C have pH value 0,3 and 6.Identify the solution [5] (a) Having highest number of H+ (b) Having least number of H+ (c) Weakly acidic (d) Out of sodium hydroxide and ammonium hydroxide, which can change the nature of solution A to basic when added in excess. (e) Arrange three solutions in increasing order of acidity. 21. What is corrosion? With the help of activity show that rusting of iron takes place in the presence of air and moisture. Draw labeled diagram of the apparatus used. List two ways by which rusting of iron can be prevented. [5] 22. Draw the pattern of magnetic field line through and around current carrying solenoid. What does the magnetic field pattern inside the solenoid indicate? State how this field be utilize to make an electromagnet. List two ways by which strength of this electromagnet can be increased.[5] 23. (a) Two identical resister each of resistance 10 Ω are connected:[5] (i) in series (ii) in parallel ,in turn to a battery of 6V . Calculate the ratio of power consumed the combination of resister in to cases. (b)Establish the relation between 1KWh and SI unit. of energy. 24.(a) Draw a diagram of human respiratory system and label:[5] Trachea, Bronchi and Diaphragm (b) Give reason for the following (i) Lungs always contain residual volume (ii) Nostrils are lined with mucus SUMMATIVE ASSESSMENT – I, 2013 SCIENCE Class – IX[Code  42OCV1Q] SDV Samastipur By JSunil18/9/2013 1. Which part of the cell in Eukaryotas organism plays an important role in cellular reproduction?[1]
2.What will be the value of “g” at the pole as compared to the value of “g” at the equator?[1] 3. Distinguish between inter varietal and interspecific hybridization of crop plants? [1] 4. Identify dispersed phase and dispersing medium I the following (a)fog and (b)Cheese[2] 5. Give one word for the following [2] (a) Group of cells with similar structure and designed to give highest efficiency function. (b) Process of taking up a permanent shape size and function. (c) Animal tissue connecting muscles to bones (d) Kidney shaped cell that enclose stomata. 6. Define uniform circular motion .draw any example related to it.[2] 7. Distinguish three states of matter with respect to following properties: [3] (a)Density (b)Diffusion (c) Partical motion 8. (a) State the difference between pure substance and mixture giving one example of each?[3] See full paper : IX Science CBSE Original paper Holy Mission School ,Laheriasrai , Darbhanga 2013
1. The power rating of an appliances is 100W 250W.What does it indicate. [1] 2. What is meant by tropic movement?[1] 3.Write the name of the substance whose vapor is used to run the turbine of the generator of ocean thermal energy?[1] 4. What happen when CO2 is bubbled through lime water (i)in small amount (ii) in excess [2] 5.Out of the two metal P and Q . P is less reactive than Q. Suggest an activity to arrange these metal in the order of their decreasing reactivity. Support your answer with suitable chemical equation?[2] 6.Draw a diagram to show the magnetic field line of the field produced by a current carrying circular loop. Indicate the point where the magnetic field will be strongest.[2] 7. The long electric cable carring current to the bulb donot glow ut filament of bulb glow.Justify this statement with reason?[2] 8. Complete and balance the equations[3] (i) Ca(OH)2 + Cl2 à (ii) CaSO4 .1/2 H2O + H2O à (iii) Na2CO3 .10H2O airà 9. Balance these equations[3] a. MnO2 + HCL à MnCl2 + H2O + Cl2 b. BaCl2 + Al2(SO4)3 à BaSO4 + AlCl3 c. Fe+H2O à Fe3O4 + H2 10. A compound P forms enamel of teeth. It is the hardest substance of the body .it does not dissolve in water but get corroded when PH lower below 5.5 (a) identify the compound “p”(b) How does it under go damage due to eating chocolate and sweet ? what should we do to prevent tooth decay? [3] 11. Account for the following (a) Fe is the most widely used metal is never used in its pure form.[3] (b) Na kept in kerosene oil (c) H2 is not evolved a metal react with nitric acids (except mg and Mn) 12. Resistance of t metal wire of length 1m is 26 ohm at 200C. If the diameter of wire is 0.3 mm,find the resistivity of the metal at this temperature? 13. Define frequency of AC. Mention the frequency and voltage of A.C In India . How many times current changes direction in one second in our domestic supply.[3] 14. Two conductors are made up of same material and have the same length .Conductor A is a solid wire of dimeter 2 mm. Conductor B is hollow tube of inner and outer dimeter 2 mm and 4mm. Calculate ratio of resistance of the solid wire to the hollow wire? [3] 15. (a) What is peristalatic movement? (b) “Stomata remain closed in desert plants during day time” how do they do photosynthesis?[3] Rest Questions are added soon For more paper SA1 Visit EXAM SPECIAL by JSUNIL TUTORIAL CBSE BOARD Class X: Sample Question Papers for Term I (September ) CBSE BOARD Class X: Sample Question Papers for Term I (September ) CBSE BOARD Class IX: Sample Question Papers for Term I (September ) CBSE BOARD Class IX: Sample Question Papers for Term I (September ) CBSE BOARD Class X: Sample Question Papers for Term II (March ) CBSE BOARD Class X: Sample Question Papers for Term II (March ) CBSE BOARD Class IX: Sample Question Papers for Term II (March ) CBSE BOARD Class IX: Sample Question Papers for Term II (March ) 
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