CBSE ADDA

Questions 1 to 4 are one mark questions. These are to be answered in one word or one sentence.                                                  Section A 1. State the chemical change that takes place when lime stone is heated strongly. 2. .Why do silver articles become black after some time when exposed to air ? 3. Name the device which directly converts solar energy into electrical energy. 4. What are amphoteric oxides ? Choose the amphoteric oxides amongst the following oxides. Na 2 O, ZnO, Al 2 O 3 , CO 2 , H 2 O  Questions 5 to 13 are two marks questions. These are to be answered in about 30 words each. 5. Draw circuit symbols of the following components :  (i) Variable resistance or rheostat (ii) Plug key or switch (closed) 6. What are antacids ? Name two compounds which are used as antacids. 7. A small amount of ferrous sulphate crystals were heated in a hard glass test tube ? (i) Write the equati

Class 8 Physcis Force and Pressure Key Term to revise before exam 1. A push or a pull acting on an object is called a force 2. Force has magnitude as well as direction. 3. A force between the two objects only when they interact with each other. 4. The sum of forces acting on bodies is called net force. 5. Forces applied on an object in the same direction add to one another then net force = f1 + f2 6. If the two forces act in the opposite directions on an object, the net force acting on it is the difference between the two forces. then net force = f1 +(- f2) 7. Net force on an object is zero if the two forces acting on it in opposite direction are equal 8. A Force can Change the State of Motion 9. If the force applied on the object is in the direction of its motion, the speed of the object increases. 10. If the force is applied in the direction opposite to the direction of motion, then it results in a decrease in the speed of the obje

X Polynomial MCQ Assignments in Mathematics Class X (Term I) 1. If α,β are zeroes of the polynomial f ( x ) = x 2 + px + q, then polynomial having 1/α and 1/β as its zeroes is (a) x 2 + qx + p (b) x 2 – px + q (c) qx 2 + px + 1 (d) px 2 + qx + 1 2. If α and β are zeroes of x 2 – 4 x + 1, then 1/α + 1/β – αβ is (a) 3 (b) 5 (c) –5 (d) –3 3. The quadratic polynomial having zeroes as 1 and –2 is : (a) x 2 – x + 2 (b) x 2 – x – 2 (c) x 2 + x – 2 (d) x 2 + x + 2 4. If α, β are zeroes of x 2 – 6x + k, what is the value of k if 3α+2β=20 ? (a)–16 (b) 8 (c) 2 (d) –8 5. If one zero of 2x 2 – 3x + k is reciprocal to the other, then the value of k is (a) 2 (b) −23 (c) −32 (d) –3 6. The quadratic polynomial whose sum of zeroes is 3 and product of zeroes is –2 is (a) x 2 + 3x – 2 (b) x 2 – 2x + 3 (c) x 2 – 3x + 2 (d) x 2 – 3x – 2 7. If (x

 SUMMATIVE ASSESSMENT –I (2012)   SCIENCE Class – IX  CBSE SAMPLE PAPER 1. An unlit incense stick (agarbatti) gives smell only when we come close to it but on lighting the stick we get smell even far away from it, why? 2. If the mass of a body is doubled what will happen to its acceleration, if the applied force remains constant ? 3. Name the processes by which CO 2  and H 2 O move into and out of a cell ? 4. Tabulate any two differences between mixtures and compounds 5. Mention any two phenomena which can be successfully explained on the basis of   Universal law of gravitation. 6. What is meant by endocytosis ? Name an organism which uses this process. 7. Mention two functions of stomata. 8. (a) Draw a labeled diagram of the apparatus used to separate a mixture of oil and   water. Write name of this apparatus. (b) State any two other applications of the technique used

Class VI Chapter: Animal Form and Functions Q1. Name the system that transports nutrients oxygen and waste?                  Ans: Circulatory system Q.2. The mouth is the part of which bodily system?                                           Ans: Digestive system Q.3. kidney is part of which system?                                                                  Ans: Excretory system Q.4. what are the animals with back bone known as?                                         Ans: vertebrates. Q.5. which fin of fish help to swim?                                                                    Ans: Paired fins Q.6. Do the joint between rib and breast bone allow movement?                     Ans: No Q.7. How many bone a human body have?         Ans: A child have 306 bones  some of which latter fuse hence  fully grown body have 206 bones Q. 8. Name the organism born with extra rib called gorilla rib?