CBSE Sample Papers for Class 10 SA2 Science Solved 2016 Set 6
1.Write the name and formula of the 2nd member of homologous series having general formula CnH2n+2H.
2.Name the causative agent of the disease “Kala-azar” and its mode of asexual reproduction.
3.List two measures that you would suggest for the better management of water resources.
4.How is the process of binary fission different in Amoeba and Leishmania ?
5.Why is it not easy for carbon to take part in the formation of ionic compounds ?
6.A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal ? Why ?
7.Why homologous series of carbon compounds are so called ? Write chemical formula of two consecutive members of a homologous series and state the part of these compounds that determines their (i) physical properties, and (ii) chemical properties.
8.Name the oxidising agents used for the conversion of ethanol to ethanoic acid. Distinguish between ethanol and ethanoic acid on the basis of (i) litmus test, (ii) reaction with sodium carbonate.
9.Ravi read the formation of covalent bonds and came to know the property of carbon.
Carbon has four valence electrons. It cannot lose four electrons since very high amount of energy will be required to lose four electrons to form C4+. Carbon cannot gain four electrons to form C4- ion as six protons cannot hold 10 electrons easily and there will be strong interelectronic repulsion
(i)What is the atomic number and electronic configuration of carbon ?
(ii)Explain how covalent bonding is important between carbon compounds. Give any two suggestions.
10.(a) Define the following terms :
(i) Valency, (ii) Atomic size
(b) How do the valency and the atomic size of the elements vary while going from left to right along a period in the modern periodic table ?
11.List in tabular form, two distinguishing features between the acquired traits and the inherited traits with one example of each.
12.There are two different types of organs, homologous and analogous. Differentiate between them by giving three points.
13.(a) Mendel crossed tall pea plants with dwarf pea plants in his experiment. Write his observations giving reason on the F1 and F2 generations.
(b) List any two contrasting characters other than height that Mendel used in his experiments in pea plants.
14.With the help of suitable examples, explain why certain traits cannot be passed on to the next generation. What are such traits called ?
15.Where should an object be placed from a converging lens of focal length 20 cm, so as to obtain a real magnified image.
16.The image of a candle flame placed at a distance 30 cm from a spherical lens is formed on a screen placed at a distance of 60 cm from the lens. Identify the type of lens and calculate its focal length. If the height of the flame is 2.4 cm, find the height of its image.
17.A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image at 10 cm from the lens ? Also find the magnification produced by the lens.
18.(a) State the basis of classification of elements in the modern periodic table ?
(b) How does the metallic character of element vary as we go down the group.
19.(a) Why did Mendeleev have gaps in his periodic table ?
(b)State any three limitations of Mendeleev’s classification ?
(c)How does electronic configurations of atoms change in a period with increase in atomic number ?
20.(a) Draw a diagram showing germination of pollen on stigma of a flower.
(b)Label pollen grain, male germ cells, pollen tube and female germ cell in the above diagram.
(c)Define fertilization in plants.
21.(a) List three distinguishing features between sexual and asexual types of reproduction.
(b) Explain why variations are observed in the offsprings of sexually reproducing organisms ?
22.”A convex lens can form a magnified erect as well as magnified inverted image of an object placed in front of it”. Draw ray diagram to justify this by statement stating the position of the object with respect to the lens in each case.An object of height 4 cm is placed at a distance of 20 cm from a concave lens of focal length 10 cm. Use lens formula to determine the position of the image formed.
23.What is meant by the power of a lens ? What is its S.I. unit ? Name the type of lens whose power is positive. The image of an object formed by a lens is real, inverted and of the same size as the object. If the image is at a distance of 40 cm from the lens, what is the nature and power of the lens ? Draw ray diagram to justify your answer. ,
24.List the sign conventions for reflection of light by spherical mirrors. Draw a diagram and apply these conventions in the determination of focal length of a spherical mirror which forms a three times magnified real image of an object placed 16 cm in front of it.
25.Soap solution is :
(A) Acidic in nature. (B) Neutral in nature.
(C) Basic in nature. (D) Both acidic and basic in nature.
26.To find focal length of a convex lens in laboratory, Manoj fixed it on a stand and kept it on a mark of 15-3 cm on an optical bench. To get a clear image of a distant tree, he adjusted a screen and finally got clear image when screen was placed at 32-5 cm. Focal length of the lens is :
(A) 32-5 cm (B) 17-2 cm
(C) 34-4 cm (D) 47-8 cm
27.Take a test tube and put soap and water and shake it 10 times by placing thumb on its mouth. What will you observe :
(A) Foam will form. (B) Water will ooze out.
(C) Soap will settle down. (D) None of these.
28.A teacher set up the apparatus for determining the focal length of a convex lens as shown below. She told them that the approximate focal length of the lens was 20 cm.
She asked them to place the screen so that a distinct image of distant tree is obtained on it by slight adjustment. Four students A, B, C, D, respectively place the screen at the mark of :
(A) 5 cm(B)65 cm
(C) 25 cm(D)95 cm
The student who placed it correctly is :
(A) A (B)B (C) C (D)D.
29.Meenu placed a concave mirror at 36.8 cm on an optical bench. A clear image of a distant tree is obtained on screen placed at 18.9 cm. The focal length of mirror is :
(A) 17.9 cm (B) 35.8 cm
(C) 18.9 cm (D) 37.8 cm
30.While studying saponification reaction, a student measures the temperature of the reaction mixture and also finds its nature using blue/red litmus paper. On the basis of his observations the correct conclusion would be:
(A)The reaction is exothermic and the reaction mixture is acidic.
(B)The reaction is endothermic and the reaction mixture is acidic.
(C)The reaction is endothermic and the reaction mixture is basic.
(D)The reaction is exothermic and the reaction mixture is basic.
31.A student after observing slide of Amoeba showing binary fission makes observation about daughter cells produced as a result of asexual reproduction :
(A)Are exact copies of parent cells
(B)Are dissimilar to parent cell
(C)Are such that one is like the parent cell and the other cell is different
(D) Have no definite pattern.
32.Seeds on germination give rise to :
(A) Plumule and endosperm.(B)Plumule and Radicle
(C) Endosperm and Radicle. (D)Endosperm and nucleus.
33.Fingers in human are an example of :
(A) Adaptation. (B)Specialisation.
(C) Variation. (D)Inheritance.
34.A student observed the slide of binary fission of Amoeba under a microscope. What should be the observations reported by him.
35.Name the type of asexual reproduction in which two individuals are formed from a single parent and the parental identity is lost. Draw the initial and final stages of this type of reproduction.
36.An object is placed between two plane mirrors inclined at an angle 0 with each other. What is the total number of images formed ?
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