2022 sc qp
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Important Instructions for the School Principal(Not to be printed with the question paper)1) This question paper is strictly meant for the use in School Based Summative AssessmentII, March-2012 only. This question paper is not to be used for any other purpose except mentioned above under any circumstances. 2) The intellectual material contained in the question paper is the exclusive property of Central Board of Secondary Education and no one including the user school is allowed to publish, print or convey (by any means) to any person not authorised by the Board in this regard. 3) The School Principal is responsible for the safe custody of the question paper or any other material sent by the Central Board of Secondary Education in connection with School based SA-II, March-2012, in any form including the print-outs, compact-disc or any other electronic form. 4) Any violation of the terms and conditions mentioned above may result in the action criminal or civil under the applicable laws/byelaws against the offenders/defaulters.
Note:Please ensure that these instructions are not printed with the question paper being administered to the examinees.
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SUMMATIVE ASSESSMENT II, 2012 II, 2012SCIENCE /
SC - 2022
Class X /Time allowed : 3 hours 3 General Instructions :(i) (ii) (iii) (iv) (v) (vi) (vii) (viii) (ix)
XMaximum Marks : 80 80
The question paper comprises of two Sections, A and B. You are to attempt both the sections. All questions are compulsory. There is no overall choice. However, internal choice has been provided in all the five questions of five marks category. Only one option in such questions is to be attempted. All questions of Section-A and all questions of Section-B are to be attempted separately. Question numbers 1 to 4 in Section-A are one mark questions. These are to be answered in one word or in one sentence. Question numbers 5 to 13 in Section-A are two marks questions. These are to be answered in about 30 words each. Question numbers 14 to 22 in Section-A are three marks questions. These are to be answered in about 50 words each. Question numbers 23 to 25 in Section-A are five marks questions. These are to be answered in about 70 words each. Question numbers 26 to 41 in Section-B are multiple choice questions based on practical skills. Each question is a one mark question. You are to select one most appropriate response out of the four provided to you.
(i) (ii) (iii) (iv) (v) (vi) (vii) (viii) (ix) 1 5 14 23 26 4 13 22 25 41 30 50 70
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SECTION-A / 1. The molecular formula of A is C10H18 and B is C18H36. Name the homologous series to which they belong. A B C10 H18 C18H36
We can see the sun for few minutes even after it has actually set. Why ?
What is Ozone ?
List two main components of our environment.
(a) (b) (a) (b)
Element Y with atomic number 3 combines with element A with atomic number 17, what would be the formula of the compound ? What is electronic configuration of element with atomic number 10 ? What will be its valency ? 3 Y 17 A 10
How would the tendency to lose electrons change as you go (a) from left to right across a period ? (b) down a group ? (a) (b)
List any two differences between pollination and fertilisation.
Name one sexually transmitted disease each caused due to (i) bacterial infection and (ii) viral infection. How can these be prevented ? (i) (ii)
For the same angle of incidence in media P, Q and R, the angles of refraction are 45, 35and15 respectively. In which medium will the velocity of light be minimum ? Give reason for your answer. P, Q R 45, 35 15
How will you use identical glass prisms so that a narrow beam of white light incident on Page 3 of 13
one prism emerges out of the second prism as a beam of white light. Draw a labeled diagram to illustrate it.
A student has difficulty in reading the blackboard while sitting in the last row. What could be the defect of vision the student is suffering from ? What are the causes for this disorder ?
(a) (b) (a) (b)
What is Chipko movement ? Why should we conserve forests ?
List four advantages of water stored in the ground.
Two compounds A and B have the molecular formula C3H8 and C3H6 respectively. Which one of the two is most likely to show addition reaction ? Justify your answer. Explain with the help of a chemical equation, how an addition reaction is useful in vegetable ghee industry. A B C3H8 C3H6
How does the electronic configuration of an atom relates to its position (period and group) in the modern periodic table ? Would you place the two isotopes of chlorine, Cl-35 and Cl-37 in different slots because of their different atomic masses or in the same slot because there chemical properties are the same ? Justify your answer.
(a) (b) Cl-35 Cl-37
(a) (b) (a) (b)
Explain the terms (i) Implantation (ii) Placenta. What is the average duration of human pregnancy ? (i) (ii)
The genotype of green stemmed tomato plants is denoted by GG and that of purple stemmed tomato plants as gg. When these two plants are crossed : (a) What colour of stem would you expect in their F1 progeny ? Page 4 of 13
Give the percentage of purple-stemmed plants if F1 plants are self-pollinated. In what ratio would you find the green and purple colour in the F2 progeny ? GG gg
(a) (b) (c) 18. F2
It is a matter of chance whether a couple will give birth to a boy or a girl. Justify the statement.
Define the terms homologous and analogous organs by giving example.
What is the minimum number of rays required for locating the image formed by a convex mirror for an object ? Draw a ray diagram to show the formation of a virtual image by a convex mirror.
A 4.0cm tall object is placed perpendicular to the principal axis of a convex lens of focal length 20cm. If the distance of the object from the lens is 30cm, find the position, nature and size of the image. Also, find its magnification. 20cm 4 cm 30 cm
What is meant by power of accommodation of eye ? The minimum power of eye lens is 40D. If the far point of normal eye is infinity find the size of eye ball. 40D (a) (b) (c) (d) What is a homologous series ? What will happens if ethanoic acid reacts with ethanol in the presence of an acid as a catalyst ? Write the chemical equation for this reaction. Why are soaps ineffective in hard water ? Write the names of the functional groups in : (i) O CH3C CH3 (ii) O CH3CH2COH
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(c) (d) (i) O CH3C CH3 O CH3CH2COH OR/ (a) Complete the following equations : (i) (ii) (b) (c) (a)
conc. H2SO4 heat
(iii) CH4 Cl2 Write the name of the following : (i) CH3CH2COOH (ii) CH3CH2CH2Br Draw the electron dot structure of ethene (C2H4) (i) (ii) (iii)
CH4Cl2CH3CH2COOH (C2H4) (ii) CH3CH2CH2Br
(b) (i) (c) 24. (a) (b) (a) (b) (a) (b) (c) (d) (a) (b) (c) (d) 25. (a) 4.5cm needle is placed 12cm away from a convex mirror of focal length 15cm. Give the location of the image and the magnification. Describe what happens as the needle is moved farther from the mirror. Page 6 of 13 OR/ What is puberty ? Name the hormones responsible for production of secondary sexual characters in human beings. Explain why the scrotum remains outside the body of human males ? Name two methods used for the regulation of childbirth. Which contraceptive method prevents the spreading of STDs ?
Draw labelled diagram of the human female reproductive system. What is menstruation in females ?
(b) (c) (a)
What kind of mirror is used in a solar furnace ? Give reason for using this mirror. One half of a convex lens is covered with a black paper. Will this lens produce a complete image of the object ? Justify your answer. 4.5 cm 15 cm 12 cm
(b) (c) OR/ When an object is placed at a distance of 60 cm from a convex mirror the magnification produced is 1/2 . Where should the object be placed to get a magnification of 1/3 ? A small electric lamp is placed at the focus of a convex lens. What is the nature of beam of light produced by the lens. Draw a diagram to show this. 60 cm 1/2 1/3 (b) SECTION - B / 26. What is the colour of freshly prepared aqueous ferrous sulphate solution ? (a) Light blue (b) Blue (c) dark green (d) Pale green (a) 27. (b) (c) (d)
A Student takes Cu, Al, Fe and Zn strips, separately in four test tubes labeled as I, II, III and IV respectively. He adds 10 mL of freshly prepared ferrous sulphate solutions to each of the test tube and observes the color of the metal residue in each case.
He would observe a black residue in the test tubes : (a) I and II (b) I and III (c) II and III I, II, III IV Cu, Al, Fe Zn 10 mL
II and IV
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When the stopper of a bottle containing colourless liquid was removed, the bottle gave out a smell like that of vinegar. The liquid in the bottle could be : (a) HCl solution (b) NaOH solution (c) Acetic acid (d) Saturated NaHCO3 solution
(c) (d) NaHCO3 5 mL of ethanoic acid was taken in two test tubes I and II each as shown in figure. Blue and Red litmus paper were dip