CBSE Sample Paper-01 (Unsolved) SUMMATIVE ASSESSMENT –II

CBSE Sample Paper-01 (Unsolved)
SUMMATIVE ASSESSMENT –II
SCIENCE (Theory)
Class – X
Time allowed: 3 hours
Maximum Marks: 90
General Instructions:
a) All questions are compulsory.
b) The question paper comprises of two sections, A and B. You are to attempt both the sections.
c) Questions 1 to 3 in section A are one mark questions. These are to be answered in one word
or in one sentence.
d) Questions 4 to 6 in section A are two marks questions. These are to be answered in about 30
words each.
e) Questions 7 to 18 in section A are three marks questions. These are to be answered in about
50 words each.
f) Questions 19 to 24 in section A are five marks questions. These are to be answered in about
70 words each.
g) Questions 25 to 27 in section B are 2 marks questions and Questions 28 to 36 are multiple
choice questions based on practical skills. Each question of multiple choice questions is a one
mark question. You are to select one most appropriate response out of the four provided to
you.
Section A
1.
2.
Identify the functional group in the following compounds:
(b) CH3CHO
(a) CH3CH2COCH3
What will be the observed colour of the sky in the absence of atmosphere? Why?
3.
Which organisms constitute the first tropic level in a terrestrial food chain?
4.
List two observations which posed a challenge to Mendeleev’s periodic law.
5.
Some plants can be grown from a seed as well as vegetative from stem cuttings. List any four
advantages of vegetative propagation in such cases.
Light enters from air to glass having refractive index 1.5. What is the speed of light in the glass?
The speed of light in vacuum is 3 x 108 m-1.
Two compounds A and B have the same molecular formula C4H8O2. Compound A is an acid and
compound B has a fruity smell. Suggest (a) name and (b) structural formula of A and B.
A hydrocarbon has four carbon atoms in it. Suggest three skeleton structures it can form.
6.
7.
8.
9.
Rina had a huge scar on her cheek after she met an accident during her school days. She is
worried if her baby would inherit the scar she had acquired. Her doctor (a sincere medical
practitioner) explained and successfully convinced Rina.
Read the given passage and answer the following questions:
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(a) What are acquire traits?
(b) How are they different from inherit traits?
(c) Mention the values of the doctors that he shows in the passage.
[Value Based Question]
10. Define the term:
(a) Analogous organs
(b) Homologous organs
(c) Sex chromosomes
11. What are the tropic levels? Give example of a food chain having four steps and name the
different levels according to their nutrition habit.
12. How do chlorofluro-carbons (CFCs) enter the atmosphere and how do they affect humans?
Explain.
13. (a) With the help of a ray diagram, show that when light falls obliquely on a side of a
rectangular glass slab the emergent ray is parallel to the incident ray.
(b) Show that the lateral displacement of the ray on the diagram.
(c) Give one factor on which lateral displacement depends.
14. What is myopia? State two causes of myopia. With the help of labelled diagram show (a) the
eye defect myopia, (b) correction of myopia using a lens.
15. A 5 cm tall object is placed perpendicular to the principal axis of a convex lens of focal length
20 cm. The distance of the object from the lens is 30 cm. Find the nature, position and size of
the image.
16. The following diagram shows the wing of a bird and hand of a human being.
(a) Give a suitable title for the above diagram.
(b) Explain the term analogous organs with examples.
17. Explain the mechanism of sex determination in human beings.
18. What is the minimum number of rays required for locating the image formed by a concave
mirror for an object? Draw a ray diagram to show the formation of a virtual image by a concave
mirror. Give one such application of concave mirror.
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19. (a) Explain with the help of a diagram why a pencil partly immersed in water appears to bent
at the water surface.
(b) One half a convex lens of focal length 20 cm is covered with a black paper.
(i) Will the lens produce a complete image of the object?
(ii) Show the formation of image of an object placed at 2F1 of such covered lens with the
help of a ray diagram.
(iii) How will the intensity of the image formed by half-covered lens compare with noncovered lens?
Or
(a) What is dispersion of white light? What is the cause of such dispersion? Draw a diagram to
show the dispersion of white light by a glass prism.
(b) A glass prism is able to produce a spectrum when white light passes through it but a glass
slab does not produce any spectrum. Explain. Why is it so?
20. The atomic number of an element is 17.
(a) What is its valency?
(b) Whether it is a metal or non-metal?
(c) Whether it is bigger or smaller in size than an element of atomic number 18?
(d) What type of bonds it will form with elements of group 18?
(e) How would its oxide behave with litmus solution?
Or
(a) Why does carbon from compounds mainly by covalent bonding?
(b) What is 5% solution of potassium permanganate is added drop by drop to warm ethanol
taken in a test tube?
21. Observe the following figure carefully and work out which trait should be considered as
dominant and which one recessive. Give reasons.
Or
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(a) Draw a diagram to show fertilization in a flowering plant. Label (i) stigma, (ii) ovary, (iii)
polar nuclei.
(b) After fertilization name the part in each case which develops into (i) the fruit, (ii) the seed.
22. (a) Why does carbon form large number of compounds?
(b) Why are some of these called saturated and other unsaturated compounds?
(c) Which of these two is more reactive?
(d) Give the names of the compounds:
(i) BrCH2CH2Br
(ii) CH3 – CH = CH – CH3
Or
Write in short, how carbon compounds are named according to IUPAC nomenclature.
23. Using ray diagram, explain the laws of formation of image by divergent lens.
Or
(a) Draw a ray diagram showing formation of image by convergent lens, when object is placed
between lens and focus.
(b) State the nature of the image formed.
(c) Will the image position and the focal length, be positive or negative?
(d) Give one application of this lens for this position of the object.
24. Draw the diagram of a flower to show its male and female reproductive parts. Label the
following on it:
(a) Ovary,
(b) Anther, (c) Filament, (d) Stigma
What is the function of anther? How do fusion of male and female gametes takes place in
plants?
Or
Draw a diagram to show fertilization in the flowering plant and label on it:
(a) Stigma
(b) Ovary
(c) Polar nuclei
After fertilization name the part in each case which develops into (i) The fruit, (ii) The seeds.
Section B
25. In the experiment shown, the gas evolved is passed through lime water, which turns milky.
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(a) Identify ‘X’.
(b) Give chemical reaction involved it.
26. The following figures illustrate binary fission in Amoeba in an incorrect sequence:
(a) Which is the correct sequence:
(b) Give reason, why it is so correct.
27. Why it is advised to keep both the mirror and screen in suitable stands with the screen put in
front of mirror in the experiment for finding the focal length of a concave mirror by obtaining
the image of a distant object. Give at least two reasons.
28. In the following groups of materials, which group(s) contains only non-biodegradable items:
(i) Wood, paper, leather
(ii) Polythene, detergent, PVC
(iii) Plastic, detergent, grass
(iv) Plastic, Bakelite, DDT
(a) (iii)
(b) (iv)
(c) (i) and (iii)
(d) (ii) and (iv)
29. When zinc metal is dipped in sulphate solution of X, X is displaced from the solution, it means
that:
(a) X is more reactive than Zinc.
(b) Zinc is more reactive than X.
(c) Zinc and X have great affinity for each other.
(d) Decomposition reaction has taken place.
30. What type of sexual reproduction the following diagram depict:
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(a) Budding
(b) Binary fission
(c) Multiple fission (d) Propagation
31. Following diagrams were drawn by four different students on having seen a prepared slide of
budding in yeast.
The correct diagram is:
(a) I
(b) Ii
32. What are the types of osmosis:
(a) Osmosis and Reosmosis
(c) Osmosis and Exosmosis
(c) I and III
(d) II and IV
(b) Osmosis and Endosmosis
(d) Endosmosis and Exosmosis
33. To demonstrate absorption of water raisins should be immersed into water:
(a) Completely
(b) Partially
(c) Both of the above
(d) None of the above
34. A student carries out the experiment of tracing the path of a ray of light through a rectangular
glass slab, for two different values of angle of incident: ∠i = 30 and ∠i = 45 . The set of values
of angle of refraction ( ∠r ) and the angle of emergence ( ∠e ) , she is likely to observe in the two
cases, are:
(a)  ∠r = 30 , ∠e = 20°  and  ∠r = 45 , ∠e = 28°
(b)  ∠r = 20 , ∠e = 30°  and  ∠r = 45 , ∠e = 28°
(c)  ∠r = 20 , ∠e = 30°  and  ∠r = 28 , ∠e = 45°
(d)  ∠r = 30 , ∠e = 20°  and  ∠r = 28 , ∠e = 45°
35. Which one of the following sets of materials represents the minimum materials required for
determining the focal length of a convex lens by obtaining an image of a distant object:
(a) Set A – A convex lens, a lens holder, a screen with stand, a measuring scale
(b) Set B – A candle, a match box, a convex lens, a lens holder, a screen with stand
(c) Set C – A lens holder, a convex lens, a measuring lens, a screen with stand
(d) Set D – A convex lens, a burning candle, a screen with stand, a lens holder
36. Which of the following is the first member of alkyne and is used in oxyacetelyne flame in
welding:
(a) Ethane
(b) Ethene
(c) Ethyne
(d) Propyne
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