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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

1 marks 1. Write the symbols of the following elements. (a) Iron (b) Silver 2. State the phylum to which antedon (feather star) and asterias (Starfish) belong. 3. Mention two factors that influence the pattern of winds. 2 marks 4. Distinguish between Bryophyta and Thallophyta stating two examples of each. 5. List the causative organisms for the following diseases. (i) Kala-azar (ii) Sleeping sickness (iii) Acne (iv) AIDS 6. The volume of 50g of a substance is 20cm3. If the density of water is 1 g/cm3, will the substance float or sink in water ? Justify your answer. 7. What is the work done by the force of gravity in the following cases ? (a) Satellite moving around the earth in a circular orbit of radius 35000 km. (b) A stone of mass 250 g is thrown up through a height of 2.5 m. 3 marks 8. Define formula unit mass ? How is it calculated. ? Write the formula unit mass of (NH4)2 SO4 . (Given atomic mass : N = 14 u, H= 1 u, S = 32 u, O= 16 u). 9. (a) If

TIME : 3 hours           Maximum Marks : 90 Instructions Q. No. 1 to 10 are MCQs ( 1mark for each question) Q. No. 11 to 23 are short answer questions write in 60-80 words ( 3 marks for each question) Q. No. 24 to 30 are long are questions write in 100-125 words ( 5 marks for each question) Q. No. 31-1 and 31-2 are map questions. Please  attach the map inside the answer book  Q.1     When were the first written ‘Laws  of Cricket’ drawn?           (a) 1774        (b) 1775        (c)1776         (d)1780         or           Radical changes in women clothing were enabled by: (a)   New times (b)Women’s movement       (c)World  war (d)Industrial revolution Q2      When did Gandhiji adopt the short dhoti ,a form of dress and wore until his death ? (a)   1920 (b)1923         (c)1922         (d)1921 Q3      Why do trees grow faster in summer?           (a)Due to high temperature           (b)Due to longer duration of sunlight           (c)Due to low temperatur

1. Which animal tissue is commonly known as packaging tissue? [1] Ans: Areolar Tissue 2. What do you mean by photoperiod? Name two processes that are dependent on photoperiod.[2] Ans: Photoperiod is related to exposure of plants to the duration of sunlight. Germination, growth and flowering (any two) in case of plants are dependent on Photoperiod. 3. What will happen if:  i) the skin epithelium is not stratified.  ii) Stratified squamous epithelium lines blood vessels. [2] Ans: i) There will be no protection to the inner layers and wear and tear will be more.        ii) The exchange of substances through selectively permeable surface cannot take place. 4. Name the target organ/organ system of AIDS virus. What is the cause of death in case of people suffering from AIDS? [2] Ans: Lymph nodes/Immune System. In absence of a strong Immune system ,minor infections can turn in to serious problems. 5.To increase productivity per unit area ,the farmers grow two differe

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