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1. Atomic no. of x = 12; Atomic No. of y = 16 2. The transfer of traits from parents to offspring is called heredity. 3. Paper and glass can be easily recycled but thrown in the dust bin. 4. This is because both the father and the mother contribute practically equal amounts of genetic material to the child during sexual reproduction in forming ztgote. 5. Object placed between pole and focus see in diagram: 6. Decomposer break-down the complex organic substances into simple inorganic substances. The natural replenishment of the soil also takes place by Decompose. 7. Watershed management is the study of the characteristics of a watershed. It helps to manage water quality, water supply, and drainage and rainwater flow. It also ensures sustainable maintenance planning of a watershed. Benefits of a watershed management system: Water quality is strictly maintained. Distribution of water is equal and sustainable. 8. The producers convert solar energy into chemical energy

Time: 3-3and1/2 hr _ Max mark: 100 [includes 10 marks based on Open Text Theme] Test held in School: Sadhana Devi Vidyapith, Samastipur - Punjabi Colony [By JSunil] 1 mark 1. As per the law of definite proportional carbon and oxygen combine in ratio 3: 8. Compute the mass of oxygen gas that would be required to react completely with 6 gm carbon. 2. A pore bearing organism like creature “A” belong to a phylum “B” of kingdom Animalia. 3. In which reason is soil erosion very difficult to revert. 2 marks 4. Explain, What is Organ specific manifestation? 5. A man drops a stone of mass 2 kg room the top of a building of height 15m when it reaches the ground, find its kinetic energy. 6. When an object is immersed in the fluid name the two forces acting on it. 3 marks 7. (a) The mass number of an element is 18. It contains 7 electrons. What is the number of proton? and neutron in it. (b) State the problem of atomic structure which was solved after the discovery

Q. Find the gram molecular mass of water (H2O) Calculation: 2(H) = 2 x 1 = 2 . 1(O) = 1 x 16 = 16 ∴ Gram molecular mass of H2O= 18g Mole is defined as the amount of substance that contains as many specified elementary particles as the number of atoms in 12g of carbon-12 isotope. One mole is also defined as the amount of substance which contains Avogadro number (6.023 x 10^23) of particles. For eg. one mole of oxygen atoms represents 6.023 x 10^23 atoms of oxygen and 5 moles of oxygen atoms contain 5 x 6 . 0 2 3 x 10 ^23 a t oms of oxygen . Q. Calculate the number of aluminium ions present in 0.051 g of aluminium oxide. [Hint : The mass of an ion is same as that of an atom of the same element. Sol: 1 mole of Al2O3 contains aluminium ions = 2 × 6.022 × 10^23 = 12.044 × 10^23 Now, 102 g of Al2O3 has number of aluminium ions = 12.044 × 10^23 0.051 g of Al2O3 has number of aluminium ions = (12.044 ×1023 × 0.051)/102= 6.022 × 10^20 ions Q. How many atoms of oxygen are present i