DPS – MIS, DOHA- QATAR
SUMMATIVE ASSESSMENT-I (2015–16)
CLASS: X
Subject: Science
Time allowed: 3hrs.
Date: 15.09.2015
Maximum Marks: 90
General instructions:
(1) All questions are compulsory.
(2) The question paper comprises of two sections, A and B. You are to
attempt both the sections.
(3) Questions 1 to 3 in section A are one mark questions. These are to be
answered in one word or in one sentence.
(4) Questions 4 to 9 in section A are two marks questions. These are to
be answered in about 30 words each.
(5) Questions 10 to 19 in section A are three marks questions. These are
to be answered in about 50 words each.
(6) Questions 20 to 25 in section A are five marks questions. These are to
be answered in about 70 words each.
(7) Questions 26 to 28 in section B are 2 marks questions and Questions
29 to 37 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. What happens when ZnCO3 is heated in limited supply of air? Give
therelevant equation.
1
2.Name the enzymes associated with the digestion of carbohydrates in
humans.
1
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3. Give the SI units of the following:
1
a) Resistivity
b) Induced current
4. “Respiration is an exothermic reaction. “Justify this statement giving the
chemical equation for the reaction involved.
2
5. A compound ‘P’ forms the enamel of teeth. It is the hardest substance of
the body. It doesn’t dissolve in water but gets corroded when the pH is
lowered below 5.5.
2
a) Identify the compound ‘P’ and write its chemical name and formula.
b) How does it undergo damage due to eating of chocolates and sweets?
6. a) Name the water conducting tissues of xylem.
b) Why is there a steady movement of water into root xylem?
2
7.Diagrammatically represent a reflex arc and label all the neurons and
CNS.
2
8. State Ohm’s law. The potential difference across the terminals of a cell is
3V. It is connected to a resistance of 30ohm. Calculate the current flowing
through the circuit.
2
9. What are fossil fuels? Why are they considered as non-renewable
sourcesof energy?
2
10. Shashi bought new silver anklets. After a month she found that the
anklets turned black. She had a doubt that it was not of pure silver but
herneighbour Rakhi advised her that it was of pure silver and asked her
to wash it with tamarind or lemon juice to get the luster back. She
followed the advice and got the luster of her anklet back. Read the
abovepassage and answer the following questions:
a) Do you think that the anklets are not of pure silver?
b) Why did the silver anklets turn black after sometime?
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3
c) How did the anklets become lustrous on washing with tamarind or
lemon juice?
d) What values are exhibited by Rakhi?
11. a) Write the chemical name and formula of bleaching powder.
3
b) A chemical compound ‘X’ is used by doctors to plaster fractured bones
and on adding water it forms a hard mass ‘Y’. Identify ‘X’ and ‘Y’.
c) A bluecolourcopper sulphatesalt becomes white on heating. Give reason
for theabove observation. What happens when we add water to the salt
which is obtained after heating?
12.a)Write the name and symbol of the metal which is low in the activity
series and exists as liquid atroom temperature.
3
b) Write the name and formula of its ore.
c) How is the metal extracted from this ore?
(Only chemical equations)
13.
3
a) Identify the type of chemical reaction.
b) Identify the gases evolved at cathode and anode.
c) Why is the amount of gas collected in one of the test tubes double
the amount in the other? Name this gas.
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14. a) Label A, B, C and D in the diagram given below.
b) List two functions of A.
3
15.a) Name the two waste products carried by our urine. 3
b) Draw a neat diagram of nephron and label the glomerulus, tubular
part, Bowman’s capsuleand collecting duct.
16.You along with your parents went to visit the house of your uncle on a
weekend. Your aunt has a very good aesthetic sense and has kept few
potted plants in the drawing room. She however complained that the
plants were bending towards one direction.
a) What can be the reason behind bending of the plants?
b) How can your aunt keep the plants straight? Do animals show such
movements?
c) What values are shown by your aunt?3
17.What is short circuiting? State one factor/condition that leads to it.
Name and explain the working of the device which helps to prevent it.3
18. Draw a diagram to show the magnetic field lines around a bar magnet.
List any two properties of magnetic field lines.
3
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19. A farmer in the village noticed that the people were using cow dung asa
fuel. He requested the Block Development officer to install a biogas
plant and also provide subsidy for the same. The biogas plant was
installed after the needful formalities.
3
i)What is bio gas?
ii) List two advantages of using bio gas over fossil fuels.
iii) What value of the farmer is seen in the above case?
20. Give suitable reasons for the following statements:
5
a) Distilled water is considered as a neutral solution.
b) We feel burning sensation in the stomach when we overeat.
c) An aqueous solution of sodium chloride is neutral but an aqueous
solution of sodium carbonate is basic.
d) A milkman adds a very small amount of baking soda to fresh milk.
e) We should not store pickles in metal containers.
21. a) Write the names and symbols of two most reactive metals.
5
b) Explain by drawing electronic structure how any one of the above two
metals react witha halogen.
c) State any four physical properties of the compound formed.
22.a) Name a plant growth promoter and inhibitor respectively.5
b) Name the hormones secreted by the pituitary and thyroid gland
respectively and name the disease caused by the deficiency of these
hormones.
c) Explain the mode of action of adrenaline.
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23.With reference to the diagram given below answer the following
questions-
5
a)Label A , B, C and D.
b) Why chamber D has more muscular walls than chamber X?
c)With the help of a word diagram show how the blood from chamber X
reaches chamber Y. What type of blood is present in Y?
24. a)Define one ampere.5
b) Give two advantages of parallel connection over series connection in
domestic circuits.
c) You have four resistors of 8ohm each. Show how you would connect
these resistors to have an equivalent resistance of 8ohm. Draw diagram
to show the connection.
25.a)What is a solenoid? Give two factors on which the strength of
magnetic field of a solenoid depends.
5
b) State the rule to find the direction of magnetic field associated with a
straight current carrying conductor.
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c)Two room heaters are marked 220V, 440 W and 220V, 800W respectively.
If the heaters are connected in parallel to 220V mainssupply, calculate:
i).The total current drawn from the electric supply.
ii) Total energy consumed in commercial units if they operate
simultaneously for 2hours.
Section B
26. A gas named ‘X’is evolved when dil. Hydrochloric acid added to a
testtube contains Sodium bicarbonate which extinguishes the
burningmatchstick. Identify the gas ‘X’ and write a test to verify the gas
formed.Write a balanced chemical equation for the reaction
betweendil.Hydrochloric acid and Sodium bicarbonate2
27.a) How are the guard cells in dicots different from monocots
structurally?
2
b) Write any two precautions that should be followed to prepare a
temporary mount of leaf peel to show stomata.
28. Observe the diagram given below and answer the following questions:
a) Potential difference across 4ohm resistance.
2
b) Compute the difference in ammeter reading of A1 and A2
29.Which of the following solvent is used for testing the presence of starch
in a leaf?1
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a) Benedict’s solution
b) Water
c) Iodine solution
d) Alcohol
30.Observe the following experimental setup. In which setup will the water
rise up in the bent tube? 1
a) Set A
b) Set B
c) Both in Set A and Set B
d) None of the above
31. Which of the following metal does not react with dilute hydrochloric
acid to liberate H2 gas?1
a) Calcium
b) Sodium
c) Iron
d) Silver
32. The pH values of distilled water, fruit juice and sodium
bicarbonatewere measured using pH papers. What is the correct
decreasing order of pH values?
a) Water > Fruit juice > Sodium bicarbonate1
b) Fruit juice > Water > Sodium bicarbonate
c) Water > Sodium bicarbonate > Fruit juice
d) Sodium bicarbonate > Water > Fruit juice
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33. Three colorless solutions are taken in test tube A, B and C. On adding
a few drops of universal indicator, certain colour changes are observed
ineach of the test tube shown in the following figure. On the basis of
theseobservations it may be concluded that:
1
A- Violet
B - Green
C- Red
(a) pH of A and B is greater than that of C
(b) pH of A and C is greater than that of B
(c) pH of B and C is greater than that of A
(d) A, B and C have almost same pH
34. Sanjay wanted to test the reactivity of zinc granules in four different
solutions as shown below. He would observe that reaction takes place
in1
Al2(SO4) 3
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FeSO4
Zn
(i)
Zn
(ii)
CuSO4
ZnSO4
Zn
(iii)
Zn
(iv)
a) i and ii
b) ii and iii
c) iii and iv d) ii and iv
35. While performing the experiment to study the dependence of current
on potential difference, across a resistor, following observations are
made by four students A, B, C, D.
1
Student
A
B
C
D
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Reading 1
Reading 2
Reading 3
V=0.5V
V=1V
V=1.5V
I=0.1A
I=0.2A
I=0.3A
V=0.8V
V=1.6V
V=2.4V
I=0.4A
I=0.8A
I=1.2A
V=1V
V=1.2V
V=1.4V
I=0.5A
I=1.4V
I=1A
V=2.4V
V=2.7V
V=2.9V
I=0.8A
I=0.9A
I=1.0A
The student who made wrong observation is
a)Student A
b) Student B
c) Student C
d) Student D
36. Graphs between electric current and potential difference across two
conductors A and B are shown in the figure. Which of the following
conductor has more resistance?
1
a) B
b) A
c) Both have equal resistance
d) Resistance cannot be measured from the graph.
37.In the experiment on finding the equivalent resistance of two resistors
connected in parallel three students connected the voltmeter in their
circuits in the three ways X, Y and Z shown here.
1
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The voltmeter has been connected correctly in
a) Cases X and Y only
b) Cases Y and Z only
c) Cases Z and X only
d)All the three cases
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