II, SUMMATIVE ASSESSMENT II, / SCIENCE CBSETODAY.COM. X / Class X. Time Allowed : 3 hours Maximum Marks : 90

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1 ... II, 06-7 SUMMATIVE ASSESSMENT II, 06-7 / SCIENCE X / Class X 90 Time Allowed : hours Maximum Marks : General Instructions :. The question paper comprises of two Sections, A and B. You are to attempt both the sections.. All questions are compulsory. All questions of Section-A and all questions of Section-B are to be attempted separately. 4. Question numbers to in Section-A are one mark questions. These are to be answered in one word or in one sentence. Question numbers 4 to 6 in Sections-A are two marks questions. These are to be answered in about 0 words each. 6. Question numbers 7 to 8 in Section-A are three marks questions. These are to be answered in about 0 words each 7. Question numbers 9 to 4 in Section-A are five marks questions. These are to be answered in about 70 words each. 8. Question numbers to 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. 9. Question numbers 4 to 6 in Section-B are questions based on practical skills. Each question is of two marks. Page of 9

2 CH CH CHO Write name of the given compound : CH CH CHO F SECTION-A A tall plant is crossed with a dwarf plant. What will be the ratio of homozygous tall and homozygous dwarf plants in F generation? Give any two uses of Bamboo for local people. 4. m 6 7 A person cannot see objects beyond. m distinctly. Giving reason name the defect of vision and name the nature of corrective lens. List four changes in our habits which can make a difference in our energy consumption patterns. Draw a sequence of suitable methods of disposal of waste produced at your home to minimize environmental pollution. What are oxidizing agents? State any two oxidizing agents. Write one chemical equation using an oxidizing agent. 8 (i) 9 (ii) (i) (ii) (i) Name the organic acid present in vinegar. Write its chemical formula. (ii) Write the balanced chemical equation for burning of : (i) Methane in air (ii) Ethanol in air Write the molecular, electronic and structural formulae of ethyne. 0 He(), Ne(0), Ar(8) He (); Ne (0) and Ar (8) belong to the same group in the modern periodic table Name the period of each element. Write the electronic configuration of each element. Page of 9

3 A O O A man with a blood group A marries a woman with a blood group O and their daughter has a blood group O. Show the cross to illustrate the same. Each organism has its own identity. Explain. What is speciation? Rhizopus is an organism which reproduces by spore formation. What is meant by spore formation? What does the reproductive part or blob of the Rhizopus contain? Why are these structures protected by thick walls? 4 Name the different parts of a bisexual flower. Draw a labelled diagram to show the female parts of the flower. Natural selection of traits is different from artificial selection. Differentiate between the two by giving three points. 6 Is there any variation in the image distance in the eye when we increase or decrease the distance of an object from the eye? Justify your answer. Define least distance of distinct vision. Give the value of least distance of distinct vision for a young adult with healthy eye. 7 (i) (ii) cm 0 cm Which will have more converging power (i) A convex lens of focal length cm or (ii) A convex lens of focal length 0 cm. Illustrate with the help of diagram DDT DDT Page of 9

4 Although banned in most industrialized countries since the early 970s, DDT is still used in many tropical countries for agriculture purposes and to control insect vectors of human diseases. DDT is present in extremely small concentrations in air and water, and, to a lesser degree in soil. However, concentration is much larger in organisms, especially in animals at or near the top of their food chain, such as humans and predatory birds. Mention the term used to describe the above phenomenon. Suggest two alternative methods to reduce the phenomenon. Mention the values that should be imbibed by the people to adopt the alternate methods. 9 0 (i) 8 (ii) How does the atomic size vary as we move (i) down a group (ii) across a period from left to right Justify the answer with reason. What will be the relative atomic size of the 8 th group element of a period as compared to other elements of the same period? Observe the ears of students of your class : Which variation do you observe related to ear? What do you conclude? Why did Mendel choose pea plant for his experiments? Give three reasons. (i) (e) (i) Name the following : Part of the female reproductive system that receives sperms. Hormone produced by the testes. Disc like structure that transports nutrition from mother to the fetus. Page 4 of 9

5 Tube that carries the egg from the ovary to the womb. (e) Site of location of testes. (ii) Explain the role ofoviduct and placenta in female resproductive system.. List two characteristics of refraction of light. Define absolute refractive index. Name the physical quantity with which refractive index of a medium can be related. What is meant by the statement that refractive index of water is.? Describe with the help of diagram an activity to show that white light is composed of sevencolours. With the help of labelled diagram show how different colours ofspectrum can be recombined. 4 State the new cartesian sigh convention used for spherical mirrors. Explain sign convention with a diagram for concave mirror. / SECTION - B The soap prepared in the laboratory is crude soap. It is : fit to use as toilet soap corrosive fit for washing but not for bathing non-corrosive 6 Page of 9

A B C D During saponification reaction, oil and alkali are reacted to give soap

Test tube A Test tube B Test tube C Test tube D 7 Soft water is one which :

does not contain calcium or magnesium chloride. contains no suspended impurities.

mirror by focusing a distant object on the screen as 0 cm.

6 A B C D During saponification reaction, oil and alkali are reacted to give soap as shown below : The test tube in which the process is correctly depicted is : Test tube A Test tube B Test tube C Test tube D 7 Soft water is one which : contains calcium or magnesium chloride. contains no salt. does not contain calcium or magnesium chloride. contains no suspended impurities. 8 0 cm 40 cm 40 cm 0 cm 0 cm A student measured the focal length of a concave mirror by focusing a distant object on the screen as 0 cm. It means that the distance between : Object and screen is 40 cm. Mirror and screen is 40 cm. Mirror and screen is 0 cm. Page 6 of 9

7 9 Mirror and object is 0 cm. A f B f C f f f f f < f f < f f < f < f f f f < f Three students measured the focal length of a convex lens using parallel rays from a distant object. All of them measured the distance between the lens and the inverted image on the screen as -- Student A saw a sharp image and labelled the distance as f. Student B saw a slightly larger blurred image and labelled the distance as f. Student C saw a slightly smaller blurred image and labelled the distance as f. The relationship between three distances would most likely be : f f f f < f and f < f f < f < f f f and f < f 0 A, B, C D A B C D i r 40 e A B C D In an experiment to trace the path of a ray of light through a rectangular glass slab, four students A, B, C and D tabulated their observations as given below : Student A B C D i r 40 e The student who performed the experiment carefully and got the correct result is : A B C D PQ Page 7 of 9

8 (I) (II) (III) (IV) Four students were asked to trace the path of light through a glass prism shown below in the figure, in which a ray enter through face PQ. The students traced the path as shown in the following figures : (I) (II) (III) (IV) Who has traced the correct path? (I) (II) Page 8 of 9

9 4 (III) (IV) Fins of a fish and flippers of whale are examples of organs. homologous vestigial rudimentary analogous Sheetal was given four seeds to study the structure of a dicotyledonous seed. The one which is suitable is : Wheat Maize Rice Bean Mohan took a small amount of acetic acid and added a pinch of sodium bicarbonate powder to it. He wants to test the evolved gas for its behaviour with Burning splinter and Lime water. Write reasons in both the tests. 6 Draw the diagrams of parent yeast cell and the chain of buds. Redraw the following incomplete ray diagram of the object placed in front of the convex lens and complete it -o0o0o0o- Page 9 of 9

SUMMATIVE ASSESSMENT-II SCIENCE

SUMMATIVE ASSESSMENT-II SCIENCE [Time allowed: 3 hours] [Maximum marks:80] General Instructions: (i) The question paper comprises of two sections, A and B. You are to attempt both the sections. (ii) (iii)