SAMPLE
PAPER – CLASS.X - SCIENCE
MAX. MARKS : 80
DURATION : 3 HRS
General Instructions:
1.
The question paper comprises 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. They are to be answered in one word or in
one sentence.
5.
All questions in Section
B are three-marks, short-answer
type questions. These are to be answered in about 50 - 60 words each.
6.
All questions in Section
C are five-marks, long-answer type questions. These are to be answered in about
80 – 90 words each.
7.
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This question paper consists of a total of 30 questions.
SECTION – A
1. A teacher gave two test
tubes – one containing water and the
other containing sodium hydroxide solution to
two students. Then he asked
them to identify the test tube containing sodium hydroxide solution. Which one
of the following can be used for
correctly identifying the test tube containing the solution of sodium hydroxide?
(a)
Blue litmus (b)
Red litmus
(c)
Sodium carbonate solution (d) Dilute HCl
2.
The following reaction is an example of a 4NH3(g)
+ 5O2(g) → 4NO(g) + 6H2O(g)
(i)
displacement reaction
(ii)
combination reaction
(iii)
redox reaction
(iv)
neutralisation reaction
(a)
(i)
and (iv) (b) (ii) and
(iii) (c) (i) and (iii) (d)
(iii) and (iv)
3.
Arrange the following elements in the order of their decreasing metallic character Na, Si, Cl,
Mg, Al
(a)
Cl > Si >Al > Mg >Na (b) Na >Mg >Al
>Si > Cl
(c) Na > Al > Mg > Cl > Si (d)
Al > Na> Si > Ca> Mg
OR
According to
Mendeleev's Periodic Law, the elements were arranged in the periodic table in
the order of
(a) increasing atomic number (b)
decreasing atomic number
(c) increasing atomic masses (d) decreasing atomic masses
4.
A person with a myopic eye cannot see object beyond
-1.2m distinctly. The power of the corrective lens used to restore proper
vision is
(a) -0.83 D (b) -0.92 D (c) +0.21D (d) +0.91D
OR
When
ciliary muscales are relaxed, focal length of eye lens is
(a)
maximum (b) minimum
(c) Neither
maximum nor minimum (d)
Cannot say
5. A student
carries out an experiment and plots the V-I graph of three samples of nichrome
wire with resistances R1, R2 and R3
respectively (see below Figure). Which of the following is true?
(a)
R1 = R2 = R3 (b) R1 > R2 > R3 (c) R3 > R2 > R1 (d) R2 > R3
> R1
6. Two resistors of resistance
2 W and 4
W when
connected to a battery will have
(a)
same current flowing through them when connected in parallel
(b)
same current flowing through them when connected in series
(c)
same potential difference across them when connected in series
(d)
different potential difference across them when connected in parallel
7. Select the eco-friendly
activity among the following
(a)
Using car for transportation
(b)
Using polybags for shopping
(c)
Using dyes for colouring
clothes
(d)
Using windmills to generate
power for irrigation
OR
It
is important to make small check dams across the flooded gullies because they
(i)
hold water for irrigation
(ii)
hold water and prevent soil erosion
(iii)
recharge ground water
(iv)
hold water permanently
(a) (i) and (iv) (b) (ii) and (iii) (c) (iii) and (iv) (d)
(ii) and (iv)
8.
In a nuclear power plant, coolant is
a substance :
(a)
which cools the hot, spent steam to condense it back to water
(b)
which transfers heat from reactor to water in heat exchanger
(c)
which is boiled to make steam to turn the turbine
(d)
which cools the generator coils to prevent their overheating.
9.
Name the compound formed when ethanol is warmed with ethanoic acid in the presence of a few drops of conc.H2SO4
10. How does atomic size vary
from left to right in a period?
11. Question number 11(i)-11(iv) are based on context and table given below. Study the context and answer the following questions.
(a)
While discussing about coal and petroleum, a teacher told
his students about PCRA’s (Petroleum Conservation Research Association)
guidelines to save the fossil fuels
while driving vehicles. Deepa was going to her
school with her mother who was driving car. At
the traffic signal, when the light was
red, Deepa suggested her mother to switch of the engine.
11(i) Fossil fuels are natural resources, then why do we need to
conserve them?
11(ii) List any two ways of saving the fossil fuels.
(b)
A student fixes a sheet of white paper on a drawing board. He places a
bar magnet in the centre of it. He
sprinkles some iron filings uniformly around the bar magnet. Then he taps the board gently and observes that
the iron filings arrange themselves in a
particular pattern.
11(iii) Why do
the iron filings arrange in a pattern?
11(iv) What does the lines along which the iron filings align
represent?
12. Answer question numbers 12(i)-11(iv) on the basis of your understanding of the following paragraph and the related studied concepts.
All humans
have a basic need to control and coordinate all the movements occurring in them. One of the requirements of
controlling all the factors of the body is a
system of rapid communication. All the cells, tissues and organs do not work
independently. They work together as one team. For example, during the process
of ingestion the eyes locate food, nose register smell, hands pick up the food,
mouth opens to eat it, teeth chew it, and saliva masticates it. So you can see
so many parts are involved in a
single task. But there has to be coordination
between them. This coordination is known
as control and coordination. The whole body systems are interconnected and work
like a team. For control and
coordination there is a system
inside our body which is known as
the nervous system and the hormonal system.
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Cells of the nervous system are called neurons which are the largest cells of our body. It consist of 3 parts namely Axon, Dendrite and cyton. The irregular structure is called a cell body that encloses a nucleus in the neoplasm. From cell body small branches arise called as the dendrite on the upper side. On the lower side it gives out only one branch that is elongated called the axon. Our body contains three types of nerves which are Sensory nerve, Motor nerve and Relay nerve. Neurons are of two types namely Medullated neuron and Non-medullated neuron.
12(i) What do
you understand by the term “control and coordination”?
12(ii) What are the two main types of nerves present in our body?
12(iii) Which cell is termed as the largest cell in our body?
(a)
Heart (b) Brain (c) Neuron (d)
none of these
12(iv) Which is the system
responsible for control and coordination inside our body?
(a)
nervous system (b) hormonal system
(c) Both (a) and (b) (d)
none of these
For question numbers 13 and 14, two statements are given- one labeled Assertion (A) and the other labeled Reason (R). Select the correct answer to these questions from the codes (i), (ii), (iii) and (iv) as given below
i) Both A and R are true and R is 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 (A): Carbon monoxide is extremely
poisonous in nature.
Reason (R): Carbon monoxide
is formed by complete combustion of carbon.
14.
Assertion
(A): In Fleming’s Left Hand Rule, the direction of magnetic field, force and current are
mutually perpendicular.
Reason (R): Fleming’s Left
hand Rule is applied to measure the induced current.
SECTION – B
15. Give scientific reasons.
(a)
Wires carrying electricity should not be
touched when bare-footed.
(b)
We must not use many electrical appliances simultaneously.
(c)
Electrical switches should not be operated
with wet hand.
16. How many groups and periods
are there in the Modern Periodic
Table? How do the atomic size and metallic character of elements vary as we
move: (i) down a group and (ii) from left to right
in a period
17. What is meant by:
(a)
Displacement reaction
(b)
Reduction reaction
(c)
Combination reaction.
Write balanced chemical equation
for each reaction:
18. (a) Describe the mechanism of breathing in human beings.
(b)
(i) Under normal conditions, what is the rate of breathing per minute?
(ii) Why does the rate of
breathing increase by 20 to 25 times during vigorous exercise?
19.
An object placed 20 cm from a convex lens forms an
image 80cm from it.
(i)
Find the focal length of lens.
(ii)
Find the magnification of the image.
(iii)
State two uses of concave mirror.
20. (a) Write the name given to bases that are highly soluble in water. Give an example.
(b) How is tooth decay related to pH ? How can it be prevented?
(c)
Why does bee sting cause pain and irritation ? Rubbing
of baking soda on the sting area gives
relief. How?
OR
(a)
Name the compound which is obtained from baking soda and is used to remove permanent
hardness of water.
(b) Write its chemical formula.
(c)
What happens when it
is recrystallised from its aqueous solution?
21.
Draw a neat diagram of
human brain and label Medulla and Cerebellum. Write the functions of the above mentioned parts
22.
Distinguish between homologous organs and analogous
organs. In which category would you place wings of a bird and wings of a bat? Justify your answer giving a
suitable reason.
23. “Rainbow is an example of dispersion of sunlight.” Justify this statement by explaining,
with the help of a labelled diagram, the formation of a rainbow in the sky. List two essential conditions
for observing a rainbow.
OR
(a) List the parts of the human eye that control the amount of light entering into it. Explain how they
perform this function.
(b)
Write the function of retina in human eye.
24.
A non-biodegradable toxic chemical has entered into
the food chain. Which type of food habit
will you suggest to a man, vegetarian
or non-vegetarian? Explain with the help of a food chain.
OR
Give
reason to justify the following:
(a)
The existence of decomposers is essential
in a biosphere.
(b)
Flow of energy in a food
chain is unidirectional.
SECTION – C
25.
(a) List the
three events that occur during the process of photosynthesis.
(b)
Describe an experiment to show that “sunlight is essential for photosynthesis.”
26. a)Derive the expression to calculate the total resistance of 3 resistors in
series.
b)Give two reasons why parallel
connection is preferred in domestic circuits.
27. Draw a longitudinal section of
a flower and label the following parts:
(i)
Part that produces pollen grain.
(ii)
Part that transfers male gametes to the female gametes.
(iii)
Part that is sticky to trap the pollen grain.
(iv)
Part that develops into a fruit.
OR
List
in tabular form the two differences between asexual and sexual mode of
reproduction.
Name and explain with the help of
labelled diagram the process by which Hydra reproduces asexually.
28.
a)What are isomers. Show the structure of any two
isomers of butane .
b)Draw the electron dot structure of ethanoic acid
& butanol.
29.
(a) What is meant by power of a lens?.
(b)
You have two lenses A and B of focal lengths +10 cm and –10 cm respectively. State the nature of
each lens.
(c)
Which of the
two lenses will form a virtual and magnified image of an object placed 8 cm from
the lens? Draw a ray diagram to justify
your answer.
OR
Draw the path
of a ray of light when it enters perpendicular to the surface of a glass slab.
In the experiment to trace the path of a ray of light through a glass slab,
(i)
If the angle of incidence is increased,
how does angle of refraction change?
(ii)
What relationship students work out when they measure
the angle of incidence and angle of emergence?
30.
(a) Carbon cannot be used as
reducing agent to obtain Mg from MgO. Why?
(b) How is sodium obtained from molten sodium chloride? Give equation of
the reactions.
(c)
How is copper obtained from
its sulphide ore? Give equations of the reactions.
OR
(a)
What is reactivity
series? How does the reactivity series of metals
help in predicting the relative
activities of various metals?
(b)
Suggest different chemical processes used for obtaining a metal from
its oxides for metals in the middle
of the reactivity series and metals towards the top of the reactivity series.
Support your answer with one example each.
SCORING KEY:-
SECTION – A ( 1 mark each)
1. b
2. a
3. b OR a
4. a OR a
5. c
6. b
7. d
8. b
9. Ethyl ethanoate(ester)
10. Decreases
11. i) Non renewable ii) Any two suitable waste. ii) due to the shape of field lines
iv)Direction of magnetic field.
12. (i) Coordination of life
processes
(ii)Sensory & motor (iii) c (iv) a
13. (ii)
14. (iii)
SECTION – B
15. a) it leads to electric shock as human body is a
good conductor. 1+1+1
b) it can lead to overloading
c) water is a good conductor of electricity leading
to electric shock.
16. 18 groups & 7
periods. ½
+ ½
i) down a group, atomic size
& metallic character increases. ½
+ ½
ii) along a period, these
decreases. 1
17. a) A more
reactive element displaces a less reactive one from its compound. ½
b) removal of oxygen or addition of hydrogen
½
c) Two or more simple substances combine to form
a new substance. ½
Equation- any
suitable example for each.
½ x 3
18. a) Steps in breathing- inhalation, exhalation,
gaseous exchange.
1+1+1
b) i) 17 times per min.
ii) due to increase in the demand for oxygen.
19. (i) 1/f=1/v – 1/u = 16cm 1
(ii) m= v/u = 4 1
(iii) Solar furnace, make up mirror,
Reflectors in torches(any two) ½
+ ½
20. a) Alkali- any one
example ½
+ ½
b) Tooth
decay is due to lowering of mouth ph due to acidic substances produced by
bacterial action.
½
+ ½
Prevention – by using basic tooth paste.
c) Due to the release of formic acid. Baking soda
neutralises it.
½ + ½
OR
a) Sodium carbonate
1x3
b) Na2CO3
c) It turns to washing soda.
21.
Refer the figure in NCERT TEXT. 2
Medulla- involuntary processes & breathing
½
Cerebellum- body posture & balance ½
22.
Homologous – same origin & structure , but different functions. 1x3
Analogous- same function, but different origin & structure.
Wings of bird & bat are analogous due to the above reason.
23. Rainbow formation- diagram refer
NCERT TEXT. 2
Conditions- Presence of water droplets,
opposite direction of sunlight ½ + ½
OR
a) Iris & pupil. By the
contraction & relaxation of muscular iris, the size of pupil can be
changed.
½ + ½ + 1
b) Retina- the screen on which
image is formed. Also has light sensitive cells. 1
24. Vegeterian, Any suitable example of a
food chain.
1+2
OR
a) For recycling of nutrients & decomposition.
2
b) Energy does not revert back
to the original source.
1
SECTION - C
25. a) Three
steps :- Absorption of sunlight by chlorophyll, conversion of light energy to
chemical energy & splitting of water into hydrogen & oxygen, conversion
of carbondioxide to glucose. 1+1+1
b)
refer exp NCERT 2
26.a) Derivation with
circuit diagram – refer NCERT text .
2+1
b) Each
device gets the required current, the entire circuit is not affetced even if
one component fails.
1+1
27. Refer NCERT text. (fig)
fig-3
i) Anther
ii) Pollentube labelling-
½ x4
iii) Stigma
iv) Ovary
OR
ASEXUAL
SEXUAL
I)
Single parent
Two parents
1+1
II)
No variation Variation
(any other suitable points)
Hydra- Budding- diagram ncert text 1+2
28.a) Definition 1
Structure
of isomers
1+1
b) electron dot structure 1+1
29. a) Reciprocal of focal length in meters.
1
b) A – convex, B – concave ½
x 2
c) A
1+ 2
Ray
diagram – refer text.
OR
Ray diagram – refer text 3
i) Angle of refraction decreases. 1
ii) Angle of incidence =
Angle of emergence. 1
30. a) Mg has more affinity
towards oxygen than carbon 1
b) Electrolytic reduction. Equations-
refer text 1+1
c) Roasting- eqs- refer text 1+1
OR
a) Arrangement of metals in the
decreasing order of reactivity. The position in the series is related to its
strength compared to others.
1+1
b) Middle reactivity- Roasting
/Calcination followed by reduction. 1
Top reactivity – Electrolytic
reduction
1
Any one suitable example for
each.
½ + ½
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