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1080614 - C1
Class - X
·¤ÿææ - X
SCIENCE
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Time allowed : 3 to 3½ hours
â×Ø Ñ 3 âð 3½ ƒæ´ÅðU
Maximum Marks : 80
¥çÏ·¤Ì× ¥´·¤ Ñ 80
Total No. of Pages : 21
·é¤Ü ÂëcÆUæð´ ·¤è ⴁØæ Ñ 21
General Instructions :
1.
The question paper comprises of two sections, A and B you are to attempt both the sections.
2.
All questions are compulsory.
3.
There is no overall choice. However, internal choice has been provided in all the three questions
of five marks category. Only one option in such question is to be attempted.
4.
All questions of section A and all questions of section B are to be attempted separately.
5.
Question numbers 1 to 4 in section A are one mark questions. These are to be answered in
one word or one sentence.
6.
Question numbers 5 to 13 are two mark questions, to be answered in about 30 words.
7.
Question numbers 14 to 22 are three mark questions, to be answered in about 50 words.
8.
Question numbers 23 to 25 are five mark questions, to be answered in about 70 words.
9.
Question numbers 26 to 41 in section B are multiple choice questions based on practical
skills. Each question is a one mark question. You are to choose one most appropriate response
out of the four provided to you.
10. An additional 15 minutes time has been allotted to read this question paper only.
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SECTION A
1.
Name the acid present in ant sting.
1
2.
What does the direction of thumb indicate in the right-hand thumb rule.
1
3.
Name the plant hormones responsible for elongation of cells.
1
4.
What steps would you suggest to minimise environmental pollution caused by burning
of fossil fuels?
1
5.
For making cake, baking powder is taken. If at home your mother uses baking soda
instead of baking powder in cake,
2
(a)
how will it affect the taste of the cake and why?
(b)
how can baking soda be converted into baking powder?
6.
In one of the industrial processes used for manufacture of sodium hydroxide, a gas X is
formed as by product. The gas X reacts with dry slaked lime to give a compound Y
which is used as a bleaching agent in chemical industry. Identify X and Y
2
7.
What are the constituents of solder alloy? Which property of solder makes it suitable
for welding electrical wires?
2
8.
A battery of 9 V is connected in series with resistors of 0.2V, 0.3V, 0.4V , 0.5V ,and 12V
resistors. How much current would flow through the 12V resistor?
2
9.
A child has drawn the electric circuit to study Ohm’s law as shown in Figure. His
teacher told that the circuit diagram needs correction. Study the circuit diagram and
redraw it after making all corrections.
2
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10.
AB is a current carrying conductor in the plane of the paper as shown in Figure. What
are the directions of magnetic fields produced by it at points P and Q? Given r1 > r2,
where will the strength of the magnetic field be larger?
2
11.
How do the guard cells regulate opening and closing of stomatal pores?
2
12.
“All plants give out oxygen during day and carbon dioxide during night”. Do you
agree with this statement? Give reason.
2
13.
What happens at the synapse between two neurons?
2
14.
Differentiate mineral, ore and gangue.
3
15.
In the following schematic diagram for the preparation of hydrogen gas as shown in
Figure, what would happen if following changes are made?
(a) In place of zinc granules, same amount of zinc dust is taken in the test tube.
(b) Instead of dilute sulphuric acid, dilute hydrochloric acid is taken.
(b) Sodium hydroxide is taken in place of dilute sulphuric acid and the tube is heated.
3
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16.
When a metal X is treated with cold water, it gives a base Y with molecular formula
XOH (Molecular mass = 40) and liberates a gas Z which easily catches fire.
Identify X, Y and Z and also write the reaction involved.
3
17.
Write one equation each for decomposition reactions where energy is supplied in the
form of heat, light or electricity.
3
18.
What is meant by the ‘magnetic field lines’? List any two properties of magnetic field
lines?
3
19.
What is electrical resistivity? In a series electrical circuit comprising a resistor made up
of a metallic wire, the ammeter reads 5 A. The reading of the ammeter decreases to half
when the length of the wire is doubled. Why?
3
20.
What is the role of fuse, used in series with any electrical appliance? Why should a
fuse with defined rating not be replaced by one with a larger rating?
3
21.
Leaves of a healthy potted plant were coated with vaseline. Will this plant remain
healthy for long? Give reasons for your answer.
3
22.
What are reflex actions? Give two examples. Explain a reflex arc.
3
23.
Observe the given figure and answer the following questions.
5
(1)
(2)
(3)
(4)
Write the complete balanced reaction for the above.
Type of reaction involved.
Is there any precipitate formed.
If any precipitate formed, write the colour of the precipitate.
OR
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A student dropped few pieces of marble in dilute hydrochloric acid, contained in a test
tube. The evolved gas was then passed through lime water. What change would be
observed in lime water. What will happen if excess of gas is passed through lime
water. Write balanced chemical equations for all the changes observed.
24.
Shown in the diagrams (a), (b), (c) and (d) are the magnetic fields around different
systems. Identify them. Compare the pattern of the fields in all the four examples. Are
they similar? Why?
5
OR
Describe the activity that shows that a current-carrying conductor experiences a force
perpendicular to its length and the external magnetic field. How does Fleming’s
left-hand rule help us to find the direction of the force acting on the current carrying
conductor?
25.
Draw a neat diagram of internal structure of human heart and label the parts which
do the following functions.
(a)
chamber where oxygenated blood from lungs is collected
(b)
largest blood vessel in our body
(c)
muscular wall separating right and left chambers
(d)
blood vessel that carry blood from heart to the lungs.
5
OR
State three main events occuring during photosynthesis. Write the over all equation
for photosynthesis and the site for photosynthesis.
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26.
27.
SECTION B
A student took the following samples to find out their pH using pH paper. The teacher
remarked that one of the samples taken was not proper. The teacher was referring to.
(a) Dilute hydrochloric acid
(b) Lemon juice
(c) Washing soda
(d) Soap solution
Four students a, b, c and d of class x measured the pH value of each one of the given
samples of distilled water, acetic acid, dil hydrochloric acid and sodium hydroxide
solution using pH papers. Which one of the following represents a correct measurement
Student
(a)
(b)
(c)
(d)
Water
7
8
7
7
1
1
Acetic acid hydrochloric acid Sodium hydroxide
1
3
1
3
1
1
1
3
13
3
1
13
28.
When zinc reacts with dilute hydrochloric acid.
(a) The surface of zinc becomes brighter
(b) The surface of zinc becomes black and dull
(c) The metal turns into powder
(d) The reaction mixture turns green
1
29.
A drop of colourless liquid was placed on blue litmus paper. The litmus paper turned
red. The liquid could be
(a) Dilute hydrochloric acid
(b) Dil. Sodium hydroxide solution
(c) Distilled water
(d) Sodium bicarbonate solution
1
30.
Aqueous solutions of zinc sulphate and iron sulphate were taken in test tubes I and II
by four students A, B, C and D. Metal pieces of iron and zinc were dropped, in the two
solution and observations made after several hours and recorded in the form of a table
as given below.
Colour change of Deposit / residue
Observation
Metal Solution
by
solution
obtained
1
A
B
C
D
Fe
ZnSO4
turned green
Silvery grey coating
Zn
FeSO4
no change
no change
Fe
ZnSO4
no change
black residue
Zn
FeSO4
colour faded
grey coating
Fe
ZnSO4
no change
no change
Zn
FeSO4
turned colourless
black residue
Fe
ZnSO4
no change
grey residue
no change
black residue
Zn
FeSO4
The correct reporting has been made in observation reported by the student.
(a) A
(b) B
(c) C
(d) D
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31.
Diagram showing a microscopic view of epidermal tissue
(a) is correct in all aspects
(b) is wrong because stoma is not shown
(c) is wrong because the guard cells are directed backwards
(d) is correct because two guard cells stomata are present
1
32.
10 ml of freshly prepared iron sulphate solution was taken in each of four test tubes.
Strips of copper, iron, zinc and aluminium were introduced, each metal in a different
test tube. A black residue was obtained in two of them. The right pair of metals
forming the precipitate is
(a) copper and zinc
(b) aluminium and copper
(c) iron and aluminium
(d) zinc and aluminium
1
33.
Which is the correct figure representing Ohm’s Law?
1
(a)
(i) only
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(b)
(i) and (ii)
(c)
7
(ii) only
(d)
(ii) and (iii)
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34.
In the experiment on finding the equivalent resistance of two resistors, connected in
parallel, three students connected the voltmeter in their circuits, in three ways X, Y and
Z shown here.
1
The voltmeter has been correctly connect in :
35.
(a)
cases X and Y only
(b)
cases Y and Z only
(c)
cases Z and X only
(d)
all the three cases
A student has to connect 4 cells of 1.5V each to form a battery of 6V. Which arrangement
is correct.
(a)
36.
A
(b)
B
(c)
C
(d)
D
Three students (A), (B) and (C). Connect their two given resistors R1 and R2 in the
manners shown.
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They connect the terminals marked X and Y above to the terminals marked X and Y in
the circuit given below.
1
They record the ammeter readings (I) for different positions of the rheostat and the
corresponding voltmeter reading (V). The average value of the ratio (V/I) in their
observations would be minimum for
37.
(a)
student A and B only
(b)
student B and C only
(c)
student C and A only
(d)
student A only
Which of the circuit components in the adjoining circuit diagram are connected in
parallel?
(a)
(c)
38.
R1 and R2 only
R1 and V only
(b)
(d)
1
R2 and V only
R1, R2 and V
In an experiment to show that sunlight is necessary for photosynthesis, the leaf is boiled
in alcohol for a few minutes using a water bath.
1
Water bath is essential because :
(a)
alcohol is highly volatile
(b)
steam from the water bath heats the leaf rapidly
(c)
steam from the water bath dissolves the chlorophyll
(d)
alcohol is inflammable
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39.
Given here is a sketch of a leaf partially covered with black paper and which is to be
used in the experiment to show that light is compulsory for the process of photosynthesis.
At the end of the experiment, which one of the leaf parts labelled. I, II and III will
become blue black when dipped in iodine solution.
(a)
(c)
40.
I only
I and III
(b)
(d)
II only
II and III
After performing the experiment to show that germinating seeds give out carbon dioxide
during respiration student drew the following diagrams.
The correct labelled diagram is
(a) A
(b) B
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(c)
C
(d)
D
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41.
The teacher instructed a student to place a healthy potted shoe flower plant in a dark
room for 24 hours prior to an experiment on photosynthesis. The purpose of placing it
in a dark room is.
(a) to increase the intake of CO2
(b) to activate the chloroplasts in the leaves
(c) to destarch the leaves
(d) to denature the enzymes in the leaves
1
-o0o-
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