SEBA Class 10 Sample Paper 2023 Science

Sample Paper 2023
11 DLIE
Total no of printed pages

Pre-Final Assessment Examination-2022
Class: X
Subject:General Science
Time: 3 hours
Full marks: 100
Pass marks : 30

SECTION: A (-911)
Out
1. For each question given below, four answers are given.
correct
of four, only one answer is correct. Select the
1x10=10
answer.

What happens when dilute hydrochloric acid is
added
a
a)
to iron filings-

i) Hydrogen gas and iron chloride are produced.

i) Chlorine gas and iron hydroxide are produced.

) No reaction takes place.

iv) Iron salt and water are produced.

1 (PTO)

b) A solution reacts with
crushed egg shells to give a gas
that turns lime water
milky. The solution contains-

i) NaCl ii) HCI
i) LiCI iv) KCI
c)The metal that exists as liquid at room
temperature is
i)Mercury (11) ) Sodium (foRI)
ii) Bromine (a Taa)
iv) Chlorine ( )
d) The arrangement of
elements in the Mendeleev's
periodic table is based on their

i) Increasing atomic mass

Decreasing atomic mass

Increas1ng atomic number

v Decreasing atomic number

and
e)e The part of the brain that controls the posture
equilibrium of our body-

) Diencephalon (U3(5PA)

2
(Contd)

i) Cerebrum ((5tk)
ii) Cerebellum (5ROIN)
iv) Medulla Oblongata (ya aRO)
Ifa cross is made between the plants having TT (tall)
)
and tt (dwarf) gentic composition, which type of plants
we will obtain in the next generation?

fe 1 9 (TT) b1 (tt) T TO

) Tall (TT) and dwarf (tt) both

(9 (TT) TE 5i (tt) T31 4 )
) Only tall (R7 )
Only dwarf ( 51)

iv) None of the above (9 I E U TRA)
The image formed by a concave mirror is observed to
be virtual, erect and larger than the object where should
be the position of the object?

focus and the centre of
i) Between the principal
curvature

At the centre of curvature (STTT<Pao)

)

3 (PTO)

) Beyond the centre of curvature
(Si TR5)
iv) Between the pole of the mirror and its
focus
principal

h The human eye can focus objects at different
distances
by adjusting the focal length of the eye lens. This is due
to

) presbyopia ((agTAd)
i) accomodation (GTRGFAU)
) near-sightedness (rT yaTo)
iv) far-sightedness (7 7BaFo)
S.I. unit of electric potential difference i s

Coulomb ( ) Volt ( )
) Ampere (4t*R) iv) Ohm (9)

Which of the following is not derived from energy of the
sun?

i) Biomass ( )
i) Nuclear energy ( )
) Geothermal energy (o Te)
iv) Wind energy (3Ttu)

A (Contd)

SECTION : B (*G1s)
2. Define exothermic reaction. 1

3. Why is sodium kept immersed in kerosine oil? 1

4. What are saturated hydrocarbons?

5. In Mendel's experiment with tall and dwarf pea plants, which

feature is dominant?

6. What is the far point and near-point ofthe human eye with
normal vision? 1

7. Identify the substances that are oxidised and that are
reduced in the following equations- 2

ZnO+C Zn + CO
i)i) CuO(s) +H,(g) > Cu(s) + H,O()

Or/aR

(PTO)

Write the balanced chemical
cquation for the following
reactions- 1+1-2

a) Zinc + Silver nitrate »Zinc nitrate + Silver

b) Barium chloride +Potassium
sulphate> Barium
sulphate + potassium chloride

8. While diluting an acid, why it is
recommanded that the acid
should be added to water, not water to the acid? 2

9./a) Write the diferences between the transport of materials
in xylem and phloem? 2

b) How is oxygen and carbon dioxide transported in human
beings?

10. Write the differences between axon and dendrite. 2

11. Describe the process of budding in hydra. 2

Or/7T

/hais the importance of DNA copying in reproduction.
2

2
gtate the laws of refraction of light.

13, Will current flow more easily through a thick
wire or a thin
wire of the same material, when connected to the same
source? Why? 2

?
Or/eqR
Ifthree resistances connected parallel in relation R, > R, >R
then what is the relation between the current through this? 2

14. Explain how does a Solenoid behave like a magnet? 2

15. What is trophic level? What is the role of decomposers in an
eco system? 1+1-2

16. Give any two ways in which non-biodegradable substances
would affect the enrionment. 2

1 (PTO)

17. Why are decomposition reactions called the opposite of
combination reactions? Write equations for these reactions.
3

Or/ya7
Write the chemical
equation of the reaction that takes place
when an iron nail is
dipped in copper sulphate solution and
also mention the type of reaction. 2+1-3

18. You have been provided with three test tubes. One
of them
contains distilled water and other two contains an acidic
solution and a basic solution respectively. If you are given
only red litmus paper how will you identify the contents of
each test tube?

19. Did Dobereiner's triads also exist in the columns of
Newland's octaves? Compare and find out. Write one
limitation of Dobereiner's classification? 2+1-3

DLI

20. Mention two achievements of Mendeleev's periodic tabie
Also mention one limitation of Mendcleev's periodic table:
2+1-3

21. Write the differences between Reflex action and walking
2+1-3
Whyrcflex arc is developed in animals?

22. Drawa labelled diagram of longitudinal section of an ideal
3
flower.

3
23. Explain how sex is determined in man.

24. A student has difficulty in reading the black board while
sitting in the last row. What could be the defect the student
is suffereing from? Draw a ray diagram correcting the defect.
1+2-3

25. Draw a labelled diagram of an electric motor. Explain its
principle and working. 1+2-3

26. Give definition of electric current. What is the S.I. unit of
electric current? Which instrument is used for measuring
electric current in an electric circuit. 1+1+13

27. Compare and contrast fossil fuels and the sun as direct
source of energy. How has the traditional use of wind and
water energy been modified for our convenience? 2+1=3

28. a) Write the name of a less reactive metal? 1

b)What is cinnabar? Write the chemical reaction when it is
b)
heated in air? 2

c)Explain
c) thermit reaction with suitable example.

29. Explain the nature of the covalent bond using the bond
formation in CH,CI. With the help of an example explain
combustion reaction? 3+2-5

(Contd)
10

photosynthesis? What are the principal events that
What is
State how CO, is absorbed
red during photosynthesis?
1+3+1-5
by
plants?

EC7 RTTT CO
magnification produced by a plane mirror is +1. What
The at a
mean? An object 5 cm in height is placed
does it
cm in iront of a convex
miror of radius of
distance 20
Find the position of the image, its
nature
curvature 30 cm.
1+4-5
and size.

7ICI9 A A +1| ? 30 cm
gr AO
20 cm Y 5 cm 5 o 0
g 7 R1 4RA RI

10
32. Internal Assessment.

11