CBSE ADDA

8th Maths Sample paper for  Practice  1. What least number must be subtracted from 7250 to get a perfect square? Also, find the square root of this perfect square 2. What is the least number by which 12348must be divided to obtain a perfect square? 3. Find the cost of erecting a fence around a square field whose area is 9 hectares if fencing costs Rs 3.50 per metre 4. Find the least number of six digits which is a perfect square. Find the square root of this number. 5. Divide (1) x3 - 1 by x - 1 (2) 7 +15x -13x2 +5x3 by 4 - 3x + x2 6. . x + y + z = 0, prove that x 3+ y3 + z3 = 3xyz. Or, Factorize : (a8 – b8) 7. If ( x2 + 1/X2) = 83 . Find X3- 1/X3 Or, , Factorize (i) 25a² – 4b² + 28bc – 49c² (ii) 5y² – 20y – 8z + 2yz 8. A motor boat covers a certain distance downstream in a river in 5 hours. It covers the same distance upstream in 6 hours. The speed of water is 2 km/hr . Find the speed of the boat in still water. 9. Th

10th Triangle (Similarity) Practice Questions For SA-1 By JSUNIL Similar figures: “Two similar figures have the same shape but not necessarily the same sizes are called similar figures. “ This verifies that congruent figures are similar but the similar figures need not be congruent. Conditions for similarity of polygon: Two polygons of the same number of sides are similar, if (i) Their corresponding angles are equal and (ii) Their corresponding sides are in the same ratio (or proportion). Note: The same ratio of the corresponding sides is referred to as the scale factor (or the Representative Fraction) for the polygons. Equiangular triangles: If corresponding angles of two triangles are equal, then they are known as equiangular triangles. A famous Greek mathematician Thales gave an important truth relating to two equiangular triangles which is as follows: “The ratio of any two corresponding sides in two equiangular triangles is always the same.” Q. The Basic Proportionalit

 Sample Question Papers Class-VIII Summative Assessment I (Year 2013 - 14)  Mathematics Question Papers Class-VIII Summative Assessment I Download File Science and Technology Question Papers Class-VIII Summative Assessment I Download File Question Papers Class-VIII Summative Assessment II (Year 2013 - 14) Mathematics Question Papers Class-VIII Summative Assessment II Download File Science and Technology Question Papers Class-VIII Summative Assessment II Download File Fore more sample paper visi t     8th Maths Sample papers

Sadhana Devi Vidyapith Assignment SA-1 +  Chapter: Magnetic Effects of Electric Current                                               Section-A [1-marks] 1. What does the direction of thumb indicate in the right-hand thumb rule? 2. What is the frequency of alternating current in India? 3. How will you use a solenoid to magnetize a steel bar? 4. An alternating electric current has a frequency of 50 Hz. How many times does it change its direction in one second? 5. Name devices which produce: (i) alternating current, (ii) direct current. 6. Name the physicist who discovered the magnetic effect of the electric current. 7. A straight copper conductor is held parallel to the axis of a freely suspended magnetic needle such that the conductor is under the needle and the current is flowing from south to north. In which direction the north of magnetic needle will move? 8. If a copper conductor carrying a current is held in north-south direction, in which direction will its magn

Summer Holiday Homework: Class 10 Science Physics  Very Short Answer Questions: 1. A battery is connected to a conductor. The end A is connected to the positive terminal and the end B to the negative terminal. What is the direction of the flow of electrons in the wire? 2. Define resistance of a conductor. What is its SI unit? 3. Define the unit  ohm!. 4. Distinguish between an open and a closed electric circuit. 5. Explain the meaning of the statement $potential difference between two points is 5 volt& 6. Give one example of a decomposition reaction which is carried out with electricity. 7. Give one example of a thermal decomposition reaction. 8. Give one example of an exothermic reaction and one of an endothermic reaction. 9. Give one example of an oxidation-reduction reaction which is also a combination reaction. 10. Give one example of an oxidation-reduction reaction which is also a displacement reaction. 11. How does the heat produce by a current pa

Chairman SDV Pankaj Jee The Sadhana Devi Vidyapith is located at Punjabi Colony, Dharampur Nistama.  The school was established in year 2000. It is a Co-educational school and offers education in English medium,running under the aegis of Sadhana Devi Memorial Seva Sansthan, Samastipur. Sadhana Devi Vidyapith is a school providing quality education to the student under the guidance of experienced teachers and a very well organized trust handle the all working, so that your kids can get the best. We are an affiliated school from C.B.S.E. till standard 10th. School Name: Sadhana Devi Vidyapith Affiliation Number: 330386 Type of Affiliation: Provisional Affiliation Period From: 1/4/2012 Affilation Period To: 31/3/2015 State: Bihar District: Samastipur Pin Code: 848101 Office Phone No: 06274-225126

Discovery of Cell Robert Hooke at first examining a thin slice of dead cork [the bark of a tree] through a self-designed microscope in 1665. Robert Hooke predicts that the cork resembled the structure of a honeycomb consisting of many little boxes. He called these boxes cells. He described about this in his book “Micrographic”.  Cell is a Latin word which means ‘a little room’. The word cell was derived from a Greek word “Cellulae” which means small room. First living cell was discovered by A.V. Leeuwenhoek with the improved microscope in pond water. Q. What are Living Organisms made up of? Answer: All living organisms that we observe around us are made up of cells. Q. Who gave the cell theory? What does it state? Which organism is an exception of cell theory? Answer: Two biologists, “Schleiden and Schwann” gave the “Cell theory” which was later on expanded by “Rudolf Virchow”. Cell theory states that (a) All plants and animals are composed of cells. (b) Cell is the ba