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General Instructions : 1. The question paper comprises of two sections, A and B, you are to attempt both the sections. 2. All questions are compulsory. 3. There is no overall choice. However, internal choice has been provided in all the three questions of five mark category. Only one option in such question is to be attempted. 4. All questions of section A and all questions of section B are to be attempted separately. 5. Question numbers 1 to 4 in section A are one mark questions. These are to be answered in one word or one sentence. 6. Question numbers 5 to 13 are two mark questions, to be answered in about 30 words. 7. Question numbers 14 to 22 are three mark questions, to be answered in about 50 words. 8. Question numbers 23 to 25 are five mark questions, to be answered in about 70 words. 9. Question numbers 26 to 41 in section B are multiple choice questions based on practical skills. Each question is a one mark question. You are to choose one most appropriate response out of the four provided to you. 10. An additional 15 minutes time has been allotted to read this question paper only. Candidates will not write any answer on the answer sheet during this time interval.
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SECTION - A 1.
Name the type of compounds which are used as refrigerants and in fire extinguishers and deplete the ozone layer in the atmosphere
1
2.
Producers always occupy the first trophic level in any food chain. Why ?
1
3.
Write the value of near point of distinct vision for normal eye.
1
4.
Draw the structure of Ethanol (C2H5OH)
1
5.
Pre - natal sex determination has been prohibited by law. State two reasons.
2
6.
What is placenta ? State its any two roles during pregnancy.
2
7.
List any four stakeholders which may help in the conservation of forests
2
8.
(a) (b)
2
9.
The refractive indices of alcohol and turpentine oil with respect to air are 1.36 and 1.47 respectively. Find the refractive index of turpentine oil with respect to alcohol. Which one of these will permit the light to travel faster ?
2
10.
Why do we observe difference in colours of the Sun during sunrise, sunset and noon ?
2
11.
Describe the formation of rainbow in the sky with the help of a diagram.
2
12.
State the positions of (i) isotopes of the same element and (ii) hydrogen in the modern periodic table.
2
13.
How does the tendency to gain electrons change as we go down the 16th group of periodic table ? Why ?
2
14.
State in brief the function of the following organs in the human female reproductive system : (a) Ovary (b) Fallopian tube (c) Uterus
3
15.
State two reasons of launching the Ganga Action Plan. Which bacteria was found in Ganga water indicating contamination ?
3
16.
(a) (b)
3
17.
The genotype of green stemmed tomato plants is denoted as GG and that of purple stemmed tomato plants is denoted as gg. When these two are crossed with each other :(a) What colour of stem would you expect in the F1 progeny ? (b) Give the percentage of purple stemmed plants if F1 plants are self pollinated (c) In what ratio would you find the genotypes GG and gg in the progeny ? Draw flow chart in support of your answer.
Why are coal and petroleum called fossil fuels ? Name any two elements present in fossil fuels in addition to carbon.
Define Heredity. Differentiate between inherited and acquired traits.
086/X/SA2/12/A1
2
3
18.
A point object is placed at a distance of 12 cm from a convex lens on its principal axis. Its image is formed on the other side of the lens at a distance of 18 cm from the lens. Find the focal length of the lens. Is the image magnified ? Justify your answer.
3
19.
(a)
A compound lens is made of two lenses in contact having powers 112.5 D and 22.5 D. Find the focal length and power of the combination. The magnification produced by a mirror is 11. What does this mean ?
3
20.
A person is not able to see distinctly the object placed at large distances but is able to read the matter written on a book comfortably. Name the defect of vision he is suffering from. State two causes for this defect With the help of a ray diagram show how this defect can be corrected
3
21.
An element X belongs to group 17 and third period of the periodic table (a) Write electronic configuration of the element. What is its valency ? (b) Predict its nature, whether it is a metal or a non - metal. (c) Give the formula of the compound formed when it combines with an element Y having valency three.
3
22.
(a) (b)
Why are soaps not considered as effective cleansing agents ? Write any two structural isomers of Pentane. (C5H12) and state their names.
3
23.
(a)
In the given figure name the parts marked 1 to 6 :-
5
(b) (a)
Differentiate between Pollination and Fertilization. OR In the given figure name the parts marked 1 to 6 :-
(b)
Differentiate between self pollination and cross pollination.
(b)
086/X/SA2/12/A1
3
24.
25.
Name the type of mirror used in the following : (a) Solar furnace. (b) Side/rear - view mirror of a vehicle. Draw labelled ray diagrams to show the formation of image in each of the above two cases. Which of these mirrors could also form a magnified and virtual image of an object ? Illustrate with the help of a ray diagram. OR (a) Draw a ray diagram in each of the following cases to show the position and nature of the image formed when the object is placed : (i) Between optical centre and principal focus (F) of a convex lens. (ii) Between F and 2F of a convex lens (iii) At 2F of a convex lens (b) How will the nature and position of image formed change in case (i) and (ii) in part (a) of this question if the lens is replaced by a concave lens ? Draw the corresponding ray diagram. (a) Complete the following reactions and name the main product formed in each case.
(a) (b) (c)
5
Alkaline KMnO
(i)
4→ CH3CH2 OH
(ii)
CH3 COOC 2 H5 →
(iii)
(b)
5
NaOH
Sunlight
CH4 1Cl2 → Write chemical test to distinguish between Ethanol and Ethanoic acid. OR What is Esterification ? Give one example. What happens when Ethanol is heated at 443 K with conc. H2SO4 ? Differentiate between addition reactions and substitution reactions shown by Hydrocarbons. SECTION - B
26.
(a) 27.
1
The diagram, which correctly depicts budding in yeast is
A
(b)
B
(c)
C
(d)
D 1
Amoeba undergoing binary fission is depicted by the diagram -
(a)
I
086/X/SA2/12/A1
(b)
II
(c) 4
III
(d)
IV
28.
Students A, B and C took raisins of equal weights. The raisins were soaked in water at room temperature. A removed raisins after 20 minutes, B after two hours and C after 40 Minutes IF P (A), P (B) and P (C) denote the percetage of water absorbed by raisins respectively, then :(a) P(A)>P(B)>P(C) (b) P(A)P(A) (d) P(A)5P(B)5P(C)
1
29
While performing experiments with raisins a student recorded following observations in the practical note look. (1) Mass of the water taken in the 5 40 g (2) Mass of raisins before soaking 5 8 g (3) Mass of raisins after soaking for about 90 minutes 5 10 g (4) Mass of water left in the beaker after the experiment 5 35 g On the basis of his observation the percentage of water absorbed by raisins is :
1
(a) (c)
( 40 2 10 ) g 40 g
( 10 2 8 ) g 8g
3 100
3 100
(b) (d)
( 40 2 35 ) g 40 g
( 10 2 8 ) g 10 g
3 100
3 100
30.
Raisins are wiped off gently before final weighing with the help of : (a) cotton (b) silk cloth (c) Filter paper (d)
31.
Equal amounts of raisins were soaked in two beakers of water. Beaker A was maintained at 208C and beaker B at 408C. After 30 minutes the percentage of water absorbed will be : (a) same in both (A) and (B) (b) more in (A) than (B) (c) more in (B) than (A) (c) double in (B) than (A)
1
32.
Three students A, B and C followed the procedure listed to find the focal length of a convex lens by measuring the image distance. A : Kept the lens as well as screen on a horizontal stand to get a sharp image of a distant object. B : Kept the lens on a stand and held the screen in hand for a sharp image C : Kept the lens in hand and moved it to get a sharp focus. Student(s) performing the experiment most precisely is/are (a) A (b) B (c) C (d) All of them
1
33.
A student has to perform an experiment on tracing the path of a ray of light passing through a rectangular glass slab for three different angles of incidence. Four of his friends suggest the following options to him : A : Draw the incident rays corresponding to 208, 508, 708 as the angles of incidence and fix the two pins on the incident rays nearly 2 cm apart. B : Draw the incident rays corresponding to 208, 458, 708 as the angles of incidence and fix the two pins on the incident rays nearly 8 cm apart. C : Draw the incident rays corresponding to 308, 458, 608 as the angles of incidence and fix the two pins on the incident rays nearly 8 cm apart. D : Draw the incident rays corresponding to 308, 458, 608 as the angles of incidence and fix the two pins on the incident rays nearly 2 cm apart. The best option is : (a) A (b) B (c) C (d) D
1
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sponge
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34.
In the glass slab experiment, the correct placement of the protractor, for measuring the angles of incidence and emergence is shown in which figure ?
(a) 35.
36.
A
(b)
B
(c)
C
(d)
D
A student determines the focal length of a device X by focussing the image of a distant tree on a white screen placed on the opposite side of the device X. The device X is (a)
Concave mirror
(b)
Convex lens
(c)
Convex mirror
(d)
Concave lens
10.3 cm.
086/X/SA2/12/A1
(b)
11 cm.
(c) 6
11.7 cm.
1
1
The focal length of a concave mirror shown below equals to :
(a)
1
(d)
12.2 cm.
37.
Acetic acid was added to a solid X kept in a test tube. A colourless and odourless gas Y was evolved. The gas was passed through lime water which turn milky. It was concluded that (a) solid X is sodium hydroxide and the gas Y is carbon dioxide. (b) solid X is sodium carbonate and the gas Y is carbon dioxide. (c) solid X is sodium acetate and the gas Y is carbon dioxide. (d) solid X is sodium hydrogen carbonate and the gas Y is sulphur dioxide.
1
38.
When a few drops of acetic acid are added to blue litmus solution it is observed that the (a) blue litmus turns red (b) no colour change occurs (c) blue litmus turns green (d) blue litmus becomes colourless
1
39.
Solution of Al2(SO4)3; FeSO4;CuSO4 and ZnSO4 were seperately taken in four test tubes and some iron filings were added in each of the test tubes. After few minutes a student would observe that the colour of :
1
40.
(a)
CuSO4 solution only changed
(b) (c)
solution of ZnSO4 and Al2(SO4)3 only changed solution of CuSO4, ZnSO4 and Al2(SO4)3 changed and that of FeSO4 did not change.
(d)
all the four solutions changed.
(a) 41.
1
When zinc is added to copper sulphate solution, the solution becomes : green
(b)
blue
(c)
pale yellow
(d)
colourless
A student takes copper, aluminium, iron and zinc metals separately in four test tubes labelled as I, II, III and IV respectively. He adds 10 mL of freshly prepared ferrous sulphate solution to each test tube and observes the colour of the metal residue in each case. He would observe a black residue in the test tubes :
(a)
I and II
(b)
I and III
(c)
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II and III
(d)
II and IV
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(¥) çÙÙ â×è·¤ÚUææð´ ·¤æð ÂêÚUæ ·¤ÚU·ð¤ ×éØ ©ÂæÎæð´ ·ð¤ Ùæ× çÜç¹° Ñ ˇÊÊ⁄UËÿ KM nO
(i)
CH 3 CH 2 OH 4→
(ii)
CH3COOC 2 H5 →
(iii)
CH4 1Cl2 →
NaOH
Sunlight
(Õ) °ÍÙæÜ ¥æñÚU °ÍÙ槷¤ ¥Ü ×ð´ ÚUæâæØçÙ·¤ ÂÚUèÿææ ·ð¤ ¥æÏæÚU ÂÚU ¥ÌÚU ·¤èçÁ°Ð
Øæ (¥) °SÅUÚUè·¤ÚUæ Øæ ãñ? °·¤ ©ÎæãÚUæ ÎèçÁ°Ð (Õ) °ÍÙæÜ ·¤æð âæÎý H2SO4 ·ð¤ âæÍ 443K »×ü ·¤ÚUÙð ÂÚU Øæ ãæðÌæ ãñ? (â) ãæ§ÇþUæð·¤æÕüÙæ´ð mæÚUæ â´·¤ÜÙ ¥çÖç·ý¤Øæ ÌÍæ ÂýçÌSÍæÂÙ ¥çÖç·ý¤Øæ ×ð´ ãæðÙð ßæÜð ¥ÌÚU ·¤æð çÜç¹°Ð 086/X/SA2/12/A1
10
5
Öæ» - Õ 26.
ØèSÅU ×ð´ ×é·é¤ÜÙ âãè Âý·¤æÚU âð ·¤æñÙ âæ ç¿æ ÎàææüÌæ ãñ?
(a) 27.
B
(c)
C
(d)
D 1
I
(b)
II
(c)
III
(d)
IV
ÌèÙ çßlæÍèü A, B ¥æñÚU C Ùð â×æÙ ÖæÚU ·¤è ç·¤àæç×àææð´ ·¤æð Üð·¤ÚU ÂæÙè ×ð´ ·¤×ÚðU ·¤ð¤ Ìæ ÂÚU ÇéUÕæðØæ A Ùð 20 ç×ÙÅU ÕæÎ B Ùð Îæð æ´ÅðU ÕæÎ ¥æñÚU C Ùð 40 ç×ÙÅU ÕæÎ ç·¤àæç×àææð ·¤æð ÂæÙè âð ÕæãÚU çÙ·¤æÜæÐ ØçÎ ç·¤àæç×àææ´ð ·¤è ÁÜ ¥ßàææðçáÌ ÂýçÌàæÌ ×æææ ·ý¤×àæ Ñ P (A), P (B) ¥æñÚU P (C) ãñ ÌÕ
1
°·¤ çßlæÍèü Ùð ç·¤àæç×àææð´ ·¤æ ÂýØæð» ·¤ÚUÌð â×Ø ¥ÂÙè ÂýØæð»æ×·¤ ·¤æÂè ×ð´ çÙÙ Âýðÿææ çܹðÐ (1) Õè·¤ÚU ×´ð çÜØð »Øð ÂæÙè ·¤æ ÖæÚU 5 40 »ýæ× (2) ÂæÙè ×ð´ çÖ»æðÙð âð ÂãÜð ç·¤àæç×àææ´ð ·¤æ ÖæÚU 5 8 »ýæ× (3) 90 ç×ÙÅU Ì·¤ ÂæÙè ×ð´ ÇéUÕæðÙð ·ð¤ Âà¿æÌ ç·¤àæç×àææð´ ·¤æ ÖæÚU 5 10 »ýæ× (4) ÂýØæð» ·ð¤ ÕæÎ Õè·¤ÚU ×ð´ àæðá Õ¿ð ÂæÙè ·¤æ ÖæÚU 5 35 »ýæ× ª¤ÂÚU çܹð Âýðÿæææ´ð ·ð¤ ¥æÏæÚU ÂÚU ç·¤àæç×àææ´ð mæÚUæ ÂæÙè ·¤è ÂýçÌàæÌ ×æææ ãæð»è Ñ
1
(a) (c)
29
(b)
¥×èÕæ ×ð´ çm¹´ÇUÙ ãæðÌð ãé° ç·¤â ç¿æ ×ð´ çιæØè ÎðÌæ ãñ ?
(a) 28.
A
1
(a) (c)
P(A)> P(B)> P(C) P(B)> P(C)> P(A)
( 40 2 10 ) g 40 g
( 10 2 8 ) g 8g
3 100
3 100
(b) (d)
(b) (d)
P(A)< P(B)
