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CBSE Sample Paper-02
SUMMATIVE ASSESSMENT –II
SCIENCE (Theory)
Class – X
Time allowed: 3 hours
Maximum Marks: 90
General Instructions:
a) All questions are compulsory
...
You are to attempt both the sections
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These are to be answered in one word
or in one sentence
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These are to be answered in about 30
words each
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These are to be answered in about
50 words each
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These are to be answered in about
70 words each
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Each question of multiple choice questions is a one
mark question
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Section A
1
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2
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3
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Draw the reflected ray
and find the angle between the incident ray and reflected ray
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6
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7
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9
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11
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Discuss
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What are homologous organs? How do they provide evidence in support of evolution?
5
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12
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13
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Give two advantages of Mendeleev’s Periodic Table
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Why was it necessary to change the basis of classification from atomic mass to atomic number
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Define the term unisexual and bisexual giving one example of each
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Explain double fertilization in plants
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Pankaj is a student of class 7
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Recently
he visited Delhi with his parents to witness Science fair
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One day, during games period, a student of same class fell down and
his lips started bleeding
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Pankaj immediately rushed to Physical Lab and
brought a Lens
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Read the above passage and answer the following questions:
(a) Name the lens or mirror brought by Pankaj
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What should
be the position of object to get such image?
(c) What values are shown by Pankaj
18
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The image is formed at a distance of 10 cm from the lens
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(b) Size and nature of the image formed
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Explain: (i) Analogous organs
(ii) Natural selection
Or
What are homologous organs? How do they differ from analogous organ? How does the study
of comparative anatomy provide evidence in favour of Organic Evolution?
20
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(iii) Using the same find the distance at which an object to be placed for getting a real, inverted
enlarged image at 45 cm using a concave mirror of focal length 20 cm
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(ii) Describe about refractive index
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21
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Why does this take place? Which colour
deviates more and why?
Or
What is long-sightedness? List two causes for development of long-sightedness
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Material downloaded from http://myCBSEguide
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(a) Write the name and symbol of alkali metal with the smallest atomic number
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(c) Write IUPAC name of the following:
(i) CH3CH2Br
(ii) CH3CH2 − C ≡ CH
(d) Give one example each of (i) diprotic acid, (ii) triprotic acid
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Or
(a) Write the name and symbol of group 17 elements belonging to second period
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To which group of periodic table does it belong?
(c) What are substitution reactions? Give one example
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(e) Why does carbon form covalent bond?
23
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(b) Name most electro-negative element in periodic table
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(c) Draw electron dot structures of (i) H2O, (ii) CH4, (iii) NH3, (iv) BF3
(d) Differentiate between ores and minerals
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(b) Name the element having highest ionization energy in periodic table
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(d) Why do ionic compounds not conduct electricity in solid state?
(e) Name the chief ore or iron
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24
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Name their causal organisms,
symptoms and preventive measures
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If burning candle is brought near each of the following test tube:
(a) In which of the following candle will get extinguished?
(b) Give the reason for your answer
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Watch the diagram given below:
Material downloaded from http://myCBSEguide
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27
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28
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When we put acetic acid in H2O, the ions formed are
II
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CH3COO−
(a) Only I
(b) Only Ii
30
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Which of the following organisms shows budding:
(a) Spirogyra
(b) Hydra
(c) Amoeba
32
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(b) mother is well fed during pregnancy
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(d) genetic composition of child has XX set of chromosomes
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Chromosomes are made up of:
(a) Protiens
(b) DNA
(c) Both of the above
(d) RNA
34
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in
(a) be fixed vertically
(b) stand in a line
(c) not be hammered
(d) All of these
35
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The II medium shown with refracted ray for the given incident ray is:
(a) denser
(b) rarer
(c) may be denser or rarer
(d) none of these
Material downloaded from http://myCBSEguide
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