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(Select and write one most appropriate option out of the four options given for each of the questions I -20)
1. In the following figure, different stages of binary fission in Amoeba are depicted. Which of the
following stage/stages shows the division of parent Amoeba to two daughter amoebae?
Parent
Amoeba

Nucleus
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Daughter
cells

ABCDE
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(a) A and B (b) Only C (r) Only D (d) D and E,
2. Find out the focal length of the given mirror. Use the information given along.

CF

+-40
(a) -40 cm (b) r 20 cm (r) -20 cm (d.) * 40 cm
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 3. What is the number of electrons which constitute one coulomb charge?
(a) L.6 x 10-1e (b) 1..6 x L01e (t) 6.0 x 1018 (d.) 6.0 x 10-18

4. The given figure shows that a child has attached earlobes.

Select the correct oPtion.

trait.
(a) Attached earlobes is a recessive (b) Both parents have attached earlobes.
(c) Mother has attached earlobes. (d.) Father has attached earlobes.
5. Which of the following compounds has (aldehyde) as the functional group?
-CHO (b)
(a) Propanol ProPanal
(r) Propaonic acid (d.) ProPanone
6. Schematic diagrams of four electric circuit composing battery, electric bulb, ammeter, and plug
key are given. Select the correct circuit.
(r) (b)

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+
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(') (d)

+
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+
tlH'
+

7. Organisms of higher trophic level which feed on several type of organisms belonging to a lower
trophic level constitute
(a) food chain (b) food web
! (c) ecosystem (d) ecological pyramid
g. A child is holding a current carrying conductor in his right hand. What does the direction of
thumb indicate?
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(o) Magnetic field (b) Current

(r) Circular loop (d) Solenoid

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 9. A mirror is fitted in a wall of Agra Fort to see the full length image of Taj Mahal. Which type of
mirror is it?
(o) concave mirror (b) plano concave mirror
(r) Convex mirror (d.) plane mirror
10. The strength of a magnetic field inside a long current carryingstraight solenoid is
(o) maximum in the middle (b) maximum at the ends
(r) more at the ends than at the centre (d) same at all points
11. Which of the following does not belong to the same homologous series?
(o) CH3OH (q C2H'OH I
)
(r) C3H6OH @.) C4HeOH
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12. The resistance of each the four conductors is L/2 ohm. What wilt be the net resistance when these
are connected in series?
(a) 0.1 o (b) 1.0 ei (r) 1.s o (d) 2.0 o
13. In an attempt to demonstrate the conduction of electricity, Adi sets up the following apparatus
and made certain observations. Which of the following observations are correct?
6 volt battery ulb
hh
+- Switch

Beaker

Nail
_8 ?_

Rubber cork

(r) Bulb will glow when solution of glucose is taken.

(ii) Bulb will glow when solution of sulphuric acid is taken.
(iii) Bulb will glow when solution of sodium hydroxide is taken.
(ir) Bulb will glow when solution of alcohol is taken.
(o) (i) and (ii) (b) (i) and (iii) (') (ii) and (iii) (d.) (iii) and (iv)
14. Observe the diagram and name the gland that secretes both enzymes and hormones.

,A

\
B'

l
'c' I

'D'

(o) A (b) 'B' (r) 'c' (d) 'D'

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 15. Resistance of copper wire is 10 O and that of nichrome wire is 15 O. Both the wires have same
length and same cross sectional area, Select the correct option.
(o) Nichrome wire has more resistivity than copper.
(b) Both the wires have same resistivity.
(r) Copper wire has more resistivity than nichrome.
(d) Resistivity depends upon the nature of the material.
16. Vikas draws the following current time graphs for two different sources. What is the frequency
of current in source II in India?
il Current Current

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Time
Time

Source I Source ll
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(o) 50 Hz (b) 100 Hz
(r) It} Hz (d) 220 Hz
Q. no L7 to 20 are Assertion - Reasoning based questions.
These consist of two statements - Assertion (A) and Reason (R). Answer these questions selecting the
appropriate option given below:
(a) Both A and R are true and R is the correct explanation of A.
(b) Both A and R are true and R is not the correct explanation of A.
(c) A is true but R is false.
(d) A is False hut R is true.
17, Assertion (A): Dispersion is caused by the difference in deviation angles for light rays of different
wavelengths.
Reason (R): The violet light has minimum wavelength, so, it deviates the maximum.
18. Assertion (A): The fore-brain and hind-brain are the main thinking parts of the brain.
Reason (R): Separate areas of fore-brain are specialised for hearing, smell, sight and so on.
19. Assertion (A): Sodium metal is stored in water.
Reason (R): The reaction between sodium and water is highly exothermic and the hydrogen gas
evolved immediately catches fire.
20. Assertion (A): The chemicals which are sprayed on the crop plants to protect them are non-
biodegradable.
! Reason (R): These chemicals get accumulated and the maximum concentration occurs at the
producers level.

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Q. no. 2l to 26 are Very Short answer questions.

21. The absorption of digested food takes place mainlyin small intestine in case of humanbeings. Explain.
22, How is roasting different from calcination?
Or
Name the process by which copper must be obtained in its pure form. Draw its well labelled
diagram.
23. (o) Which is the basic event in reproduction?
(b) What is the information source for making proteins?
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Buds

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(o) Identify the type of reproduction shown in the above diagram.
(b) Write one advantage of this type of reproduction.
How would you name the following compounds?
(o) CH3-CH r-CHr-Br (b) HCOOH
HH
(r) CH3CH2CHO (d)

HH
25. (o) why is it important for us to take iodised salt in our diet?
(b) what is the function of the hormone secreted by thyroid gland?
26. The following diagram displays a chemical reaction.

chloride
+

China dish
(o) (r) Identify the type of chemical reaction.
(ii)Write the chemical equation of the reaction.
(b) Mention one commercial use of this salt.

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27 to 33 are Short Answer Questions.

27. calculate the resistance of the resistors of the following combinations.
6f) (a)
(b)
6f) 6o (b)

(a)
(c)

6C) 6C)
(i)

6f, 6f)

6c)
(iii)
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 Zg. Advitya mixed 3 ml of sodium sulphate solution to 3 ml of barium chloride solution as shown in
the figure.

BaCl,
solution
Test tube
containing
White ppt. sodium sulphate
of BaSOo solution

(o) Identify the type of reaction shown and define it.

(b) Write the type of chemical reaction that takes place.
(') Complete and balance the given equation.
* +
Ca(OH), + HNO3
2e. (o) How can you prepare -+hard water in Chemistry laboratory?
(b) What happens when hard water is treated with soap?
-
(') Write a difference between soap and detergent on the basis of their cleansing action.
30. (o) Why reflex action has to take place in animals?
(b) Define geotropism. Draw a labelled diagram of a plant showing geotropic movements of its parts.
31. (o) What is magnetic field? Why are magnetic field lines shown closer together in and around
some parts?
(b) What precautions should be taken to avoid the overloading of domestic electric circuits?
(') Why is metal casing of the electric appliances is earthed?
32. (o) What is chemotropism? Give one example.
(b) Name a plant growth hormone which is synthesized at the shoot tip. Why does a plant shoot
bend towards light during its growth?
33. (o) List any two methods by which solid wastes of urban areas are disposed off.
(b) The existence of decomposers is essential in a biosphere. Explain.
Or
(o) List two natural ecosYstems.
(b) In the given food chain
Grass -+ Deer + Lion
Which one will have highest concentration of pesticides and why?
(') Give any two ways in which non-biodegradable substances affect the environment.

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Q.no. 34 to 36 are Long answer questions.

34. (o) Why do acids not show acidic behaviour in absence of water?
(b) An element A burns with a golden flame. It reacts with another element 'B' having atomic
number l7 to give 'C'. An aqueous solution of 'C' on electrolysis gives a compound 'D' and
liberates two gases which are collected at two electrodes. Identify 'H,'B','C' and 'D'. Name
the gases and the electrodes at which these get collected. Write the equations involved.
Or
(o) The formula of plaster of pairs is CaSOo. LlzIF.2O and that of gypsum is CaSOo-2HrO.ls
it possible for a salt to have LlZ a molecule of water as water of crystallisation? Justify your
answer.
(b) How do farmers neutralise the effect of acid rain in their fields?
(') What is dilution? Why should acid always be added slowly to water with constant stirring?
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 35. (o) Complete the given ray diagram.

2F, F1

(b) A doctor has prescribed a corrective lens of power + 2.5D. Find the focal length of the lens.
Is the prescribed lens diverging or converging?
(t) The image of a needle placed 15 cm from a lens is formed on a wall 30 cm on the other side
of the lens. Find the focal length of the lens and size of image formed, if the size of object
needle is 3 cm.
Or
(o) Velocity of light in diamond having refractive index 2.42 is minimum whereas optical density
is maximum. Explain.
(b) Which mirror is used by a dentist and why?
(t) A concave lens is kept in contact with a convex lens of focal length 30 cm. The combination
works a converging lens of focal length 90 cm. Calculate power of lens. Also, calculate the
focal length of the lens.
36. (o) What are unisexual flowers? Give two examples. What type of pollination is seen in such
flowers? Name two pollinating agents.
(b) Draw longitudinal section of a flower and lable-
(r) female reproductive parts (ii) male reproductive parts
(iii) non-reproductive parts
Or
(o) With the help of a diagram show the different stages of binary fission in Amoeba.
(b) How do Plasmodium and Leishmania reproduce? Write one difference in their mode of
reproduction.
(r) Why are budding, fragmentation and regeneration all considered as asexual Upes of reproduction?

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Q.no. 37 to 39 are Case'Based/Data-based Questions with 2 to 3 short sub-parts. Internal choice is

provided in one of these sub-parts.
37. Kabir sets up the following apparatus to study the reaction of metals with salt solution. He puts
the clean copper wire in a solution of iron sulphate and the iron nail in a solution of copper
sulphate. He records his observations after 20 minutes.

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Test tube
Test tu stand

lron nail Copper wire

Copper lron sulphate
sulphate solution
solution

lron nail

(o) In which test tube did he find that a reaction has occurred? What is the type of reaction?
(b) write a chemical equation for the reaction that has taken place.
(') On what basis can he say that a reaction has taken place?
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(r) Study the following reactions.
(r) 3Mg + Al2 (so4), * 3Mgsoo + z1it (ii) zn * FeSOo -----+ znsoo * Fe
(iii) 2Al + 3ZnSOo---+ Al2 (SO4). + 3Zn
Find out which is the most reactive metal. Arrange the metals in the order of decreasing reactivity.
38. Ankit's father has to undergo dialysis after every fortnight as his father's kidneys are not working.
It he does not undergo the"pro..drrr" of dialysis, poisonous wastes get accumulated in the body
and that may lead to the death of a person.
Line from artery Tubing made of a
selectively permeable
membrane

\o
\ Line from solution
1 apparatus to vein
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Fresh dialysing Used dialysing
solution solution
(with urea and

(o) How do unicellular organisms remove harmful ,ffiffif,:tlrurt" from their bodies?
(b) Draw a diagram of excretory system in human beings. Label the following parts and write
one function of each.
(r) Kidneys (ii) Ureters (ili) Urinary bladder (lu) Urethra
Or
(b) Name the basic filtration unit present in the kidneys of human beings. Draw its well labelled diagram.
39. Hold a concave mirror in your hand and direct concave mirror
its reflecting surface towards the sun. Direct
the light reflected by the mirror on to a white
card-board held close to the mirror. Move the
card-board back and forth gradually until you
find a bright, sharp spot of light on the board.
This spot of light is the image of the sun on Principalaxis
the sheet of paper; which is also termed as
l'Principal Focus" of the concave mirror.
(o) List two applications of concave mirror. Principal Focus

(b) If the distance between the mirror and the principal focus is 15 cm, find the radius of
curvature of the mirror.
t. (t) Draw a ray diagram to show the type of image formed when an object is placed between
pole and focus of a concave mirror.
Or
n (t) An object 10 cm in size is placed at 100 cm in front of a concave mirror. If its image is
't
formed at the same point where the object is located, find:
^'

\ (l) focal length of the mirror, and

(ii) magnification of the image formed with sign as per Cartesian Sign convention.
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