KENDRIYA VIDYALAYA SANGATHAN (CHANDIGARH REGION)
CLASS- X
Time allowed: 3 hours
Maximum marks: 90
General Instructions:
(i) The question paper comprises two sections, A and B. You are to attempt both the sections.
(ii) All questions are compulsory.
(iii) There is no choice in any of the question.
(iv) All questions of Section-A and B are to be attempted separately.
(v) Question numbers 1 to 3 in Section - A are one mark question. They are to be answered in
oneword or in one sentence.
(vi) Question numbers 4 to 6 in Section - A are two marks questions. These are to be
answered in 30words each.
(vii) Question numbers 7 to 18 in Section - A are three marks questions. These are to be
answered inabout 50 words each.
(viii) Question numbers 19 to 24 in Section-A are 5 marks questions. These are to be
answered in 70words each.
(ix) Question numbers 25 to 33 in Section- B are multiple choice questions based on practical
skills.Each question is a one mark question. You are to select one most appropriate response
out ofthe four provided to you.
(x) Question numbers 34 to 36 in Section B are two marks questions based on practical
skills.These are to be answered in brief.
SECTION-A
Q1.Name the functional groups present in CH3COOH& CH3COCH3?
Q2. List any two industries based on forest?
Q3. What is the nature of the image formed by a concave mirror if the magnification
produced by the mirror is +3?
Q4.Properties of some elements aregiven below. Identify in each case the elements and group
in the periodic table to which it belongs
(a) A soft metal stored under kerosene.
(b) An element which is tetravalent and forms the basis of organic chemistry.
Q5.List any two difference between pollination and fertilization.
Q6.(a) Write the appropriate names of the trophic level Z and X in the given figure below:
Z
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SECONDRY
CONSUMERS
X
PRODUCER
(b) To protect the food plants from insects, an insecticide was sprayed in small amounts but it
was detected in high concentration in human beings. How did it happen?
Q7.(a)Covalent compounds are poor conductors of electricity Give one reason.
(b)Name the compound:
(c)What happens when ethanol reacts with sodium. Also write equation for it.
Q8.. The elements of second period of the periodic table are given below:
Li, Be, B, C, N, O, F, Ne
i)
Atomic radius decreases from Li to F .Give reason.
ii)
Identify the most metallic and non-metallic elements
iii)
Write the valency of Li and O.
Q9.Compare the Mendeleev’s Periodic Table with Modern Periodic Table.(any three points)
Q10.Draw the well labelled diagram of female reproductive system .
Q11. Draw the longitudinal section of flower and label on it the following:
(a) ovary
(b) style
(c) stigma
(d) anther
Q12.The following diagram shows the wing of butterfly and bats wing:
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(i)
Give a suitable title for the given diagram.
(ii)
Explain the term homologous organs with an example.
Q13.(a)i) In a cross between a white flowered plant and pink flowered plant, the F1
generation was found to be pink. On the basis if this information, which are the dominant and
the recessive traits?
ii) What is the ratio of whita and pink flowered plants in F2 generation?
(b) Give the name of the plant on which Mendel experimented ?
Q14. What are fossils? State two methods of determining the age of fossils.
Q15. Name the type of mirror used in the following situations:
i)
Rear view/side view mirror in vehicles
ii)
Shaving mirrors.
iii)
Headlights of vehicles
Justify your answer giving reason in each case
Q16. (a) How are power and focal length of lens related?
(b)A convex lens forms a real and inverted image of a needle at a distance of 50 cmfrom it.
Where is the needle placed in front of convex lens if the image is equal tothe size of object?
Also, find the power of the lens.
Q17. Suddenly a news spread in the school that a student of class IX A has expired due to
heart attack, but he has donated his beautiful eyes to one of his friend. All the members of
school felt very sad for his untimely death, but on the other side they were overwhelmed on
hearing the donation of his eyes to his friend, who would now be able to see this beautiful
nature.
(a)Do you think that the student who expired had done good job? Justify.
(b)Is it worth to donate vital organs? Explain
Q18.What is hypermetropia?write its two cause. Show with the help of diagram how this
defect of hypermetropia can be corrected?
Q19. An organic compound ‘A’ is widely used as a preservative in pickles and has a
molecular formula C2H4O2.This compound reacts with ethanol to form sweet smelling
compound ‘B’.
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(a) Identify the compound ‘A’ and ‘B’
(b) Write the chemical equation for the reaction with ethanol to form compound ‘B’.
(c) How can we get compound ‘A ‘back from ‘B’? Name the process and write
corresponding chemical equation.
(d) Which gas is produced when compound ‘A’ reacts with washing soda.
Q20(a) Identify A, B, C, D in the given diagram.
(b) What is fertilisation? How is the act of fertilisation carried out in angiosperms? Explain.
Q21. (a) Write two factors that can lead to the formation of new species.
(b) Name one vertebrate fossil and one invertebrate fossil
(c)Write any two causes of variations in sexually reproducing organisms?
(d)How is the sex of an unborn child determined in human beings?
Q22.(a)What is dispersion of white light? what is the causes of such dispersion? Draw a
diagram to show the dispersion of white light by a glass prism.
(b)Why do stars twinkle?
Q23.(a) Draw the ray diagrams in each of the following cases to show the formation of
Images when object is placed:
i.
Between pole and principal focus of a concave mirror.
ii.
At 2F of a convex lens.
(b) An object of size 5cm is placed at a distance of 25 cm from the pole of a concave mirror
of radius of curvature 30cm .calculate the distance and size of the image so formed. what will
be the nature of the image?
Q24. (a) What is ChipkoAndolan? Write its two aims.
(b) List any three practices to conserve our environment.
SECTION B
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25) Acetic acid reacts with zinc in all the test tubes. A pop sound is heardwhen a burning match stick
is brought near the test tubes. Which test tubewill produce this pop sound?
Q26.Synthetic detergent produces scum with :
a) Soft water onlyb) Hard water onlyc) )Both hard and soft water onlyd) None of these
Q 27. 5 ml each of acetic acid and water are mixed together and shaken in different test tubes
as given below:
Q28.A student while observing the properties of acetic acid would report that this acid smells
like:
a) vinegar and turns red litmus blue
b) rotten egg and turns red litmus blue
c)vinegar and turns blue litmus red
d) rotten egg and turns blue litmus red acid.
Q29. The following figure illustrates binary fission in Amoeba in an incorrectsequence.
The correct sequence is:
a) i, iii, iv, ii
b) iii, iv, i, ii
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c) iv, iii, ii, i
d) iii, iv, ii, i
Q30.In an experiment to trace the path of ray of light passing through a rectangular glass slab, four
students A,B,C, and D tabulated their observations as given below:
student
A
B
C
D
∠𝑖
300
300
300
300
∠𝑟
180
190
200
240
∠𝑒
320
300
32.50
290
The students who has performed the experiment carefully and sincerely is?
(a) A
(b) B
(c) C (d) D
Q31.In which of the following cases will no dispersion take place when sunlight passes
through it?
(a) (b)
(c )
(d)
Q32.To find the focal length of concave mirror, Sita should choose which one of the
following set-ups?
(a) A mirror holder and a screen holder.
(b) A screen holder and a scale.
(c) A mirror holder ,screen holder and a scale.
(d) A screen, a mirror ,holders for them and a scale.
Q33.Which colour is at the lower end of visible spectrum
a)Redb)Greenc)Yellowd)Violet.
Q34.State the procedure of preparing soap in laboratory.
Q35.What are cotyledons? What is their function in seed? How is bean seed different from
maize seed on the basis of number of cotyledons?
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Q36. A student traces the path of ray of light through a rectangular glass slab , as follows ,
but leaves it unlabelled and incomplete.
Redraw the complete diagram and label in it
i) Angle of incidence ∠ i
ii) Angle of refraction ∠ r
iii) Angle of emergence ∠ e
iv) Lateral displacement
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