SAMPLE QUESTION PAPER-CODE-IXZ
CLASS X
TIME : 3H SCIENCE
M M : 80
General
Instructions:
1. The question paper consists of three sections - A, B and C. Attempt all the sections.
2. All questions are compulsory.
3. Internal choice is given in each section.
4. All questions in section A are one-mark questions
comprising MCQ, VSA type and assertion - reason type questions. These are to be
answered in one word or in one sentence.
5. All questions in section B are three - mark, short - answer
type questions. These are to be answered in about 50 - 60 words each.
6.All questions in section C are five - mark, long - answer
type questions. These are to be answered in about 80 - 90 words each.
7. This question paper consists of a total of 30 questions.
SECTION A
1. Name the product formed when hydrogen is added to ethene.
What is this reaction known as? 1
2. State modern periodic law.
1
3.Answer question numbers 3(a) – 3(d) on the basis of your
understanding of the following paragraph and the related studied concept.
Methan village in Sidhpur tehsil, Patan district of Gujarat
saves 500 metric tones of fuel wood annually. They have
been doing this for the last 15 years. This village is the home for
India’s largest bio gas plant. Mehsana
based Dudh Sagar Dairy (DSD) and
the state government’s Gujarat Energy Development Agency had initially
helped set up the plant. DSD officials approached the villagers with their plan for the plant, and educated
them in the utilization of cow dung to
produce bio gas. This, they said, would reduce both indoor pollution and
dependence of firewood.
The bio gas plant has eight digesters with a total
capacity of 630 cubic metres (cum) Six
digesters have a capacity of 85 cum each, and two have a capacity of 60 cum
each. The digesters are used on a daily rotation basis. Every day, one digester
is filled with a trolley of cow dung that is mixed well with water in a mixer-well. The
temperature inside a sealed digester is maintained 35oC – 55oC.
Microorganisms in the cow dung get metabolised at this temperature. The end
products of the process are biogas and digested substrate. Methan, with its
high cattle population, is never short of cow dung. One trolley of cow dung weighs two and a half tones, and costs Rs.
125. Dry waste, digested substrate, from the biogas plant is used in the fields
as rich manure. This manure is sold at Rs. 300 per trolley, and is much in
demand in the village.
3. (a) Write the advantage of bio gas over fossil fuel.
1
3. (b) How is bio gas produced in the bio gas plant ? 1
3. (c) Why do you think
Methan is an ideal location for this project?
1
3 .(d)Bio gas plant is a boon to farmers. Discuss. 1
4. Answer question numbers
4(a) – 4(d) on the basis of your understanding of the following
paragraph and the related studied concept
Hypothyroidism is a condition in which your thyroid gland
does not produce enough of certain crucial hormones. It may not cause some
noticeable symptoms in the early stages. Over time, untreated hypothyroidism can cause
a number of health problems, such as obesity, joint pains, infertility and heart
disease. Accurate thyroid function tests are available to diagnose
hypothyroidism. Treatment with synthetic thyroid hormone is usually simple, safe and effective once you
and your doctor find the right dose for you.
The sign and the
symptoms vary depending upon the
severity of the hormone deficiency. Problems tend to develop slowly, often over a number of years. At
first, you may barely notice the symptoms
such as fatigue and weight gain. Or you may simply attribute them to
getting older. But as your metabolism continue to slow , you may develop more
obvious problems.
4.(a) Write two symptoms of hypothyroidism.
1
4. (b) Where is thyroid gland located in our body ? 1
4. (c) Name the hormone of thyroid gland and state its one
function.
1
4. (d) Why is the use of iodised salt advisable ?
1
5. Linear magnification produced by a concave mirror may :
(a) less than 1 or equal to
1 (b) more than
1 or equal to 1
(c) less than 1,
more than 1 or equal to
1 (d)
less than 1 or
more than 1
OR
A concave mirror produces a
magnification of +4. The object is placed :
(a) at the focus (b) Between focus and centre of curvature
(c) between focus and pole (d) beyond the centre of
curvature 1
6. If the potential difference between the ends of a fixed resistor is
halved, the electric power will become :
(a) double (b)
half (c) four times (d)
one-fourth 1
7. An induced current is produced when a magnet is moved
into a coil. The magnitude of induced current does not depend on :
(a) the speed with which the magnet is moved (b) the number of the turns of the coil
(c) the resistivity of the wire of the coil (d)the strength of the
magnet 1
8. Which of the following combination of terms has no fossil
fuel ?
(a) wind, ocean, coke
(b) kerosene, tide, wind (c) wood, wind, sun (d) petrol, wood, sun
OR
The use of one of the following is eco-friendly. This one is
:
(a) car for transportation (b) polythene bags
for shopping
(c) windmills for generating power (d) dyes for colouring clothes 1
9. One of the following is not a direct stakeholder in the
management of the forest :
(a)The people who live in urban areas.
(b) the people who have paper mills.
(c) the people who runs the paper mills.
(d) the people who
compaign for the conservation of forests.
1
10. Consider the following equation of the chemical reaction
of a metal M :
4 M + 3 O2 ------>
2 M2 O3
This equation represents :
()a) combination reaction as well as reduction reaction
(b) decomposition reaction as well as oxidation reaction
(c) oxidation reaction as well as displacement reaction
(d)combination reaction as well as oxidation reaction
1
11. A salt whose aqueous solution will have a pH of more than
7 will be :
(a)K2CO3 (b)
K2SO4
(c) NaCl (d)
NH4Cl 1
12. The three elements having chemical symbols of Si, B, and
Ge are:
(a) all metals
(b) all non-metals
(c) all metalloids (d)
Si is metalloid, B is
metal and Ge is
non-metal
OR
The atomic number of four elements P, Q, R and S are 6, 8, 14 and 16 respectively. Out of
these, the element known as the metalloid is:
(a) P (b)
Q (c) R
(d) S 1
For question numbers 13 and 14, two statements are given –
one labeled Assertion (A) and the other
labeled Reason (R). Select the correct answer of these questions from the codes
(i), (ii), (iii)and (iv) as given below.
(i) Both A
and R are true and
R is the correct explanation of
the assertion.
(ii) Both A
and R are true but
R is not the correct explanation
of the assertion.
(iii) A is true but
R is false.
(iv) A is false
but R is true.
13. Assertion : Ethane and
propane do not undergo addition reactions.
Reason : Ethane
and propane are unsaturated hydrocarbons. 1
14. Assertion : Coils of electric toasters and electric
irons are made of an alloy rather than a pure metal.
Reason :The
resistivity of an alloy is much higher than that of a pure metal 1
SECTION B
15.A strip of metal X is dipped in a blue coloured salt
solution YSO4. After some time, a layer of metal Y from the salt solution is formed on the
surface of metal strip X. Metal X is used in galvanization where metal Y is
used in making electric wires. Metal X and metal Y together form an alloy Z.
(a) What could metal X be ?
(b) What could metal Y be ?
(c) Name the metal salt YSO4
(d) What type of chemical reaction takes place when metal X
reacts with salt solution YSO4
? Write the equation of the reaction involved.
(e) Name the alloy Z.
3
16. Separate the following into substances having pH
values above and below 7. How do
these influence litmus paper ?
(a) Vinegar
(b) milk of magnesia (c) Stomach juices
OR
An aqueous solution of sodium carbonate is basic in nature
and that of ammonium chloride is acidic
in nature. Give reason. Write chemical
equations for the reactions involved
during the hydrolysis of these salts.
3
17.The positions of three elements A, B and C in the periodic table are shown below
:
|
Group 16
|
Group 17
|
|
---
|
---
|
|
---
|
A
|
|
---
|
---
|
|
B
|
C
|
(a) State whether
A is a metal or non-metal.
(b) State whether
C is more reactive or less
reactive than A.
(c) Will C be larger
or smaller than B ?
Justify your answers
with reason. 3
18. Write down a food chain :
(a) in the sea.
(b) which ends with humans.
(c) with five links
in it.
OR
Consider the food chain
: Grass ---->
Deer ----> Lion
(a) What will happen if all the lions in the ecosystem are
killed ?
(b) What will happen if all the deer in the ecosystem are
killed ?
(c) Calculate the amount of energy available to the lion in
the above food chain if plants have
20,000 Joule of energy available
from the sun.
3
19. What substances are contained in the gastric juice ? State
their functions. 3
20. The genotype of
green-stemmed tomato plant is denoted as GG and
that of purple-stemmed tomato plant as gg. When these two are crossed :
(a) What colour of the stem would you expect in their F1 progeny
? and why ?
(b)Give the percentage of purple-stemmed plants if F1 plants are self-pollinated. Explain.
(c) In what ratio would you find the genotypes GG and Gg in
the F2 progeny ? 3
21. Compare and contrast nervous and hormonal mechanisms for
control and coordination in the animals.
3
22. (a)Why is the tungsten used almost exclusively for the
filament of electric lamps ?
(b) 100 J of heat is produced per second in a 4 ohm
resistor. What is the potential difference across the resistor ?
3
23. State the rule to determine the
direction of a (i) magnetic field produced around a straight
conductor -carrying current, (ii) force
experienced by a current-carrying straight conductor placed in a magnetic field which
is perpendicular to it and (iii)
current induced in a coil due to its rotation in a magnetic field. 3
24. (a) Draw a labeled diagram of dispersion of white light
by the glass prism.
(b) Why does the sky appear dark instead of blue to an
astronaut ?
OR
(a) Draw a labeled diagram of recombination of the spectrum
of white light.
(b)Why the danger
signal lights are red in colour ?
3
SECTION
C
25. (a) Differentiate between roasting and calcination.
(b)Metal X
exists as its sulphide XS. It is used in the bulb of laboratory thermometer.
Identify the metal and write its symbol.
(c) Name the ore of the metal and write its chemical
formula.
(d) How will you convert this sulphide ore in to the metal ?
Explain with equations.
OR
State the reason for the following :
(a) Prior to reduction, the metal sulphides and carbonates
must be converted into metal oxides .
(b) The metal sodium can not be obtained from its oxide by heating with carbon.
(c) Copper can not displace zinc from its salt solution.
(d)Calcium and magnesium start floating when react with water.
(e) Aluminium is a highly reactive metal, yet it is used to
make utensils for cooking. 5
26. A compound C,
having molecular formula, C2H4O2 reacts with
Na – metal to form a compound R and evolves a gas G which burns with a pop
sound. Compound C on treatment with an alcohol A in
the presence of an acid forms a sweet smelling compound S
having molecular formula, C3H6O2. On
addition of NaOH to C, it also gives R and
water. S on
treatment with NaOH solution gives back R and
A.
(a) Identify C, R, A,
S and G
(b) Write equations for the reactions involved.
5
27. The liquid
connective tissue A circulates in our body continuously without
stopping. This tissue contains a pigment B
which imparts its colour C. The tissue
A consists of four
components D, E,
F and G. The component D
fights infections and protects us from diseases. The component E
helps in the clotting of tissue A if a person gets a cut. The
component F is a liquid which consists mainly of water
with many substances dissolved in it and component G
carries oxygen from the lungs to all the parts of the body.
(a) What is (i) tissue
A (ii) pigment
B and (iii)
colour C?
(b) Name (i) D (ii) E
(iii) F and (iv) G.
(c) Name one substance , other than oxygen, which is
transported by the tissue A in the human body.
(d) Which two component of the tissue A are
the cells without nucleus? 5
28.(a) Draw the human
female reproductive system and label the following parts.
(i) The part through
the sperms enter
(ii) The part which
releases the egg.
(iii) The part in which fertilization takes place
(iv)The part in which the foetus develops.
(b) In humans, the male gametes have 23 chromosomes.
(i)What is the number of chromosomes in the female gamete?
(ii)What is the number of chromosomes in the zygote?
OR
(a) Draw a neat sketch of the stamen of a flower. Mark in it
filament and anther.
(b) Draw a neat sketch of the carpel of the flower. Mark in
it stigma, style and ovary.
(c) What is made in (i) anther and (ii) ovary of the flower?
(d)How is the process of pollination different from
fertilization? 5
29. (a) Draw a schematic diagram of a circuit consisting of
a battery of four cells of 1.5 V each, a
5 ohm resistor, a 10 ohm resistor and a 30 ohm resistor, all connected in parallel, and a plug key and
an ammeter in the circuit.
(b) From the circuit
diagram, calculate :
(i) the value of
current through each resistor
(ii) the total current in the circuit.
(iii) the total effective resistance of the circuit
5
30. (a) Give two circumstances in which a concave mirror can
form a magnified image of an object placed in front of it. Illustrate your
answer by drawing labelled ray diagrams
for both.
(b) Which one of these circumstances enables a concave
mirror to be used as a shaving mirror ? Give reason.
OR
(a)What do you understand by the power of a lens ?
(b) Name and define the unit of power of a lens.
(c) A
combination of lenses for a camera contains two converging lenses of focal lengths 20 cm and
40 cm and a diverging lens of focal length
50 cm. Find the power and focal length of the combination of lenses. 
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