CBSE ADDA

Diversity in Living Organisms solved CBSE Paper-5 Oswal Question Bank Diversity in Living Organisms         Do wnload File Very Answer type Questions [1 mark each]   1.State the phylum to which centipede and prawn belong. (Board 2013) Answer: Arthropoda.          2. In which kingdom would you place an organism which is single called, eukaryotic and photo- synthetic? (Board 2013) Answer:  Protista. 3.Rewrite the scientific name correctly : (i) panthera tigris (ii) periplaneta Americana. (Board 2012.,  501004) Answer:  (i) Panthers tign's  (ii) Periplaneta americana. 4.Name the term which is used for the following (i) The left and right halves of the body have the same design. (ii) Animal tissue defferentiate from the three embryonic germ layers. (Board 2012, 501005; 47023) Answer:  (i) Bilaterally symmetrical. (ii) Triploblastic.        5.Name the phylum to which Prawn and Centipede belong. (Board 2012, SC-1008; 47001, )  

1.A submarine enters a sonar pulse, which returns from an under water cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff? Ans: t = 1.02s, v = 1531m/s Now d=s x t Distance travelled by sonar pulse = 2d = 2x1531x1.02 = 1561.62m Distance of the cliff = d/2= 1561.62/2 = 780.81m 2. If the tension in the wire is increased four times how will the velocity of wave in a string varies? Answer: velocity of the wave in string is directly proportional to the square root of the tension thus if tension is increased 4 times the velocity will be doubled. 3. What is Echo. Explain the conditions that have to be satisfied to hear an echo? Ans: reflection of sound wave from a large obstacle is called an echo. The most important condition for hearing an echo is that the reflected sound should reach the ear only after a lapse of at least 0.1 second after the original sound dies off and the obstacle is at least at a distance of 17 m 4. Why do echoes produced in an

Solved problems:Class 9 _Atoms and Molecules  1. Q. 5 g of calcium combine with 2 g of oxygen to form a compound. Find the molecular formula of the compound. (Atomic mass of Ca = 40 u; O = 16 u)  Ans. Number of moles in 5g of calcium = mass / molar mass    =5 /40    =  0.125  Number of moles in 2g of oxygen = mass / molar mass         =  (2 / 16)  =  0.125 Now we will calculate the simplest ratio of the element by dividing the number of moles of each element by the smallest value.  Since number of moles of each element is 0.125, therefore calcium and oxygen are present in a ratio of 1 : 1. Thus the empirical formula of the compound is CaO. For calculating the molecular formula, we need the molecular mass of the compound. However, because a compound with the formula CaO is known, Therefore the molecular formula of the compound is CaO. . Q. (i) Name the body which approves the nomenclature of elements and compounds.

Fully Solved Questions from previous year board Paper Question: 1. What causes buoyant force (or up thrust) on a boat? Answer: Buoyant force is due to volume of boat and density of water. Question: 2. what is the cause of buoyant force? Answer: : The pressure difference on lower part and upper part of a body cause of buoyant force . Question: 3. An Object of volume V is immersed in a liquid of density P. Calculate the magnitude of buoyant force acting on the object due to the liquid Answer: Vd g Question: 4. why does a block of wood held under water rise to the surface when released? Answer: This happens because as upward force is greater than the weight. Question: 5. What happens to the buoyant force as more and more volume of a solid object is immersed in a liquid. When does the buoyant force become maximum? Answer: The buoyant force exerted by a fluid is equal to the weight of fluid displaced. Therefore the buoyant force increases as more and more vol

Download and starts practicing sample papers for class 9 [Maths and Science] New Class 9 Science S A - 1 Fully Solved Sample Question papers 9th science sa-1 toppers fully solved Sample paper-1 Download File 9th science sa-1 toppers fully solved Sample paper-2 Download File 9th science sa-1 toppers fully solved Sample paper-3 Download File 9th science sa-1 toppers fully solved Sample paper-4 Download File 9th science sa-1 toppers fully solved Sample paper-5 Download File 9th science sa-1 toppers fully solved Sample paper-6 Download File 9th science sa-1 toppers fully solved Sample paper-7 Download File Class 9 Science S A - 1 Fully Solved Original Question papers 9th science SA - 1 fully solved Question paper -1 Download File 9th science SA - 1 fully solved Question paper -2 Download File 9th science SA - 1 fully solved Question paper -3 Download File Class 9 Mathematics S A - 1 Fully Solved Sample Question papers Class 9 Maths SA-1 fully solved paper with Marking Scheme Class 9

CBSE solved ,unsolved test papers,Notes, Assignments and Guess Papers : First Term: Improvement in Food Resources. Plant and animal breeding and selection for quality improvement and management; use of fertilizers, manures; protection from pests and diseases; organic farming. SA-I (2013) TLPEK7V 1. Mention two climatic conditions essential for different crops for growth and completion of their life cycle. 1 Ans: Temperature and photoperiods. 2. “Green Revolution of 1960 is a boon by itself”. List three steps that may be initiated to increase crop production 3 Ans: The major groups of activities for improving crop yields can be classified as: (a) Crop variety improvement (b)Crop production improvement (c) Crop protection management. 3. In what ways internal parasites like worms and flukes and external parasites cause harm to the cattle’s. 3 Ans: External parasite – Skin diseases; worms – affect stomach and intestine; Flukes – damage liver 4. Explain the mean

We are providing you scanned copy of exercise so that you can check your study chapters are: 1. Food production     2.The cell  3. Micro organism   4. Reproduction  5. Synthetic Material 6. Metal and non metals  7.Combustion and Flame  8.Force and Pressure Some of them are here Basic Science Question Answer Class 8 Bharati Bhawan Publication  Class 8 Metal and Non Metal                             Download File Class 8 Combustion and Fuel                             Download File Class 8 Electricity and Lighting                         Download File Class 8 Microorganisms Friend and Foe            Download File Click on Link Searches related to basic science for class 8 simple science experiments for class 8 basic science for class 7 basic science for class 6 basic 8th grade science Class VIII Mathematics  [Click on links given below] VIII Algebra VIII Commercial Maths VIII Geometry & Mensuration   CBSE Class VIII Science Physics