SUMMATIVE ASSESSMENT SC 2044 II, 2012
Transcript of SUMMATIVE ASSESSMENT SC 2044 II, 2012
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SUMMATIVE ASSESSMENT – II, 2012
II, 2012
SCIENCE /
Class – X / X
Time allowed : 3 hours Maximum Marks : 80
3 80
General Instructions :
(i) The question paper comprises of two Sections, A and B. You are to attempt both the
sections.
(ii) All questions are compulsory.
(iii) There is no overall choice. However, internal choice has been provided in all the five
questions of five marks category. Only one option in such questions is to be attempted.
(iv) All questions of Section-A and all questions of Section-B are to be attempted separately.
(v) Question numbers 1 to 4 in Section-A are one mark questions. These are to be answered in
one word or in one sentence.
(vi) Question numbers 5 to 13 in Section-A are two marks questions. These are to be answered
in about 30 words each.
(vii) Question numbers 14 to 22 in Section-A are three marks questions. These are to be
answered in about 50 words each.
(viii) Question numbers 23 to 25 in Section-A are five marks questions. These are to be answered
in about 70 words each.
(ix) 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 select one most appropriate
response out of the four provided to you.
(i)
(ii)
(iii)
(iv)
(v) 1 4
(vi) 5 13 30
(vii) 14 22 50
(viii) 23 25 70
(ix) 26 41
SC 2044
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SECTION – A /
1. What is common name of CH3CCOH ?
CH3CCOH
2. On which factor does the colour of the scattered white light depend ?
3. What is an Ecosystem ?
4. Among the given organisms identify the organism that has the maximum concentration of harmful chemicals if we form a food chain. Give reason for your answer :- Rat , peacock, wheat grains, snake.
5. (a) State Modern periodic law. (b) Write the electronic configuration of the element which belongs to second period and third group of the periodic table.
(a)
(b)
6. (a) Why does atomic size decrease as we move from left to right along a period in the periodic table ?
(b) How many groups and periods are there in the modern periodic table ?
(a)
(b)
7. Which parts / organs of the human reproductive systems perform the following functions : - (a) Site of implantation of gamete (b) Entry of sperms in female reproductive system
/
(a)
(b)
8. Give any two suitable differences between Radicle and Plumule.
9. (a) Define Refraction. (b) A ray of light incident an one face of a rectangular glass slab emerges from the
opposite face of the slab parallel to the direction of the incident ray. Why does it happen so ?
(a)
(b)
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10. Why do stars twinkle ? Explain with the help of diagram.
11. (a) Define distance of distinct vision and give its range.
(b) What is the role of iris in a human eye ?
(a)
(b)
12. Name four basic elements present in fossil fuels.
13. What important message is conveyed by Amrita Devi Bishnoi Award for wildlife
conservation ?
14. (a) Draw a diagram to illustrate formation of triple bond between two atoms of
Nitrogen. (Atomic number of Nitrogen is 7)
(b) Out of two compounds – ethane and ethene, which is more reactive ? Give reason
for your answer.
(a) 7
(b)
15.
Group 13 Group 17
-- B
-- C
-- --
A D
Using the given part of the periodic table, answer the following questions
(a) Compare the electro negativities of A and D.
(b) What is the valency of element D ?
(c) Out of the element given above name the most non metallic element in group 17.
13 17
-- B
-- C
-- --
A D
(a) A D
(b) D
(c) 17
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16. (a) Name any two plants that reproduce by Grafting.
(b) List any two benefits to an organism that reproduces through spores ?
(a)
(b)
17. In a cross between plants with purple flowers and plants with white flowers the offsprings
of F1 generation all had white flowers. When the F1 generation was self – crossed, it was
observed in the F2 generation that out of 100, 75 flowers were white. Make a cross and
answer the following :-
(a) What are the genotypes of the F2 progeny ?
(b) What is the ratio of White : Purple flowers in the F2 generation ?
F1
F1 F2 100 75
(a) F2
(b) F2
18. (a) Explain Geographical isolation.
(b) Giving reasons state whether the following are Homologous or Analogous organs :-
(i) Wings of butterfly and wings of a bat
(ii) forelimbs of frog and human
(a)
(b)
(i)
(ii)
19. Look at the given picture and write its name. Also give its significance in the study of
evolution of organisms. (2 points)
20. 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. In which of
the two medii the speed of light will be more ?
1.36 1.47
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21. (a) Define power of a lens and give its units.
(b) A convex lens forms a real and inverted image of a needle at a distance of 50cm from
it. Where is the needle placed in front of this lens if the image is equal to the size of
the object ? Also find power of the lens.
(a)
(b) 50cm
22. What is hypermetropia ? Draw ray diagrams to show the image formation of an object by :
(i) Hypermetropic eye,
(ii) Correction made with a suitable lens for hypermetropic eye.
(i)
(ii)
23. (a) Complete the following equation
4Alkaline KMnO Heat3 2CH CH OH
What is the role of alkaline KMnO4 in the above chemical change ?
(b) Name the following compounds :
(a) CH3CH2CH2CH3
(b) CH3 COCH3
(c) Name and define the property due to which carbon is able to form bonds with other
carbon atoms.
(a)
4KMnO3 2CH CH OH
KMnO4
(b)
(a) CH3CH2CH2CH3
(b) CH3 COCH3
(c)
OR/
(a) What happens when a piece of sodium metal is dropped in ethanol ? Write the
chemical reaction involved.
(b) Some time bottoms of cooking vessels (get blackened) while cooking food When and
why does it so happen ?
(c) Differentiate between saturated and unsaturated hydrocarbons. (2 points)
(a)
(b)
(c)
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24. (a) Give reasons : (i) Blocking of Fallopian tubes prevents pregnancy (ii) Testes are located outside the abdomen cavity (iii) Pre-natal sex determination has been banned by law (b) With the help of suitable diagrams explain how reproduction occurs in Hydra ? Also name the process involved.
(a)
(i)
(ii)
(iii)
(b)
OR/
(a) Give reasons :- (i) Placenta is extremely essential for foetal development. (ii) Blocking of vas deferens prevents pregnancy. (iii) Copying of DNA is important in the process of reproduction. (b) With the help of suitable diagrams explain how reproduction occurs in Planaria. Also name the process involved.
(a)
(i)
(ii)
(iii) DNA
(b)
25. (a) For a concave mirror draw ray diagram to show reflected ray for a ray incident – (i) at its pole (ii) at its centre of curvature (b) Which type of mirror is used by a dentist to examine teeth and why ? (c) An object 5cm in length is held 25cm away from a converging lens of focal length 10cm. Find the position, size and nature of image.
(a)
(i)
(ii)
(b)
OR/
(a) A point object is placed at a distance of 12cm from a convex lens on its principal axis. Its image is formed on the other side of the lens at a distance of 18cm from the lens.
Find the focal length of the lens. Is the Image magnified ? Justify your answer by drawing a diagram for the same. (Diagram maynot be drawn
to scale) (b) Draw ray diagrams to show image formation by a convex lens when object is at (i) between focus and optical centre (ii) between F and 2F
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(iii) beyond 2F
(a) 12 cm
18 cm
(b)
(i)
(ii) F 2F
(iii) 2F
SECTION – B /
26. Time taken for the colour of ferrous sulphate solution to turn colourless when Aluminium
metal is added to it is approximately.
(a) Few seconds (b) 2 hours
(c) 24 hours (d) 30 minutes
(a) (b) 2
(c) 24 (d) 30
27. A student added Aluminium, copper, Zinc and iron metals to copper sulphate solution in 4
different test tubes. In one of the test tubes he observed that no colour change of copper
sulphate solution took place. Mark that test tube ?
(i) Test tube 1 Aluminium + copper sulphate
(ii) Test tube 2 Zinc + copper sulphate
(iii) Test tube 3 Copper + copper sulphate
(iv) Test tube 4 Iron + copper sulphate
(a) i (b) ii (c) iii (d) iv
(i) 1 +
(ii) 2 +
(iii) 3 +
(iv) 4 +
(a) a (b) b (c) c (d) d
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28. Ethanoic acid
(a) is completely soluble in water.
(b) is insoluble in water.
(c) is partially soluble in water.
(d) forms turbid solution with water.
(a)
(b)
(c)
(d)
29. When acetic acid and sodium carbonate are made to react, it is observed that a gas is
liberated which turns lime water milky. The gas which is liberated is –
(a) SO2 (b) H2 (c) NO2 (d) CO2
(a) SO2 (b) H2 (c) NO2 (d) CO2
30. Odour of acetic acid is like :
(a) scent (b) vinegar (c) apple (d) orange
(a) (b) (c) (d)
31. The focal length of a convex lens shown below equals
(a) 41cm (b) 40cm (c) 20cm (d) 60cm
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(a) 41cm (b) 40cm (c) 20cm (d) 60cm
32. A student mounts a spherical mirror on a mirror stand and places the stand along a metre
scale at 22cm mark. In front of spherical mirror he mounts a white screen and moves it back
and forth along the metre scale, till a highly sharp, well defined image of a distance building
is formed on the screen, now at 45.5cm mark of the metre scale. What is the focal length of
the mirror ?
(a) 10cm (b) 23.5cm (c) 17.25cm (d) 15.5cm
22 cm
45.5
cm
(a) 10cm (b) 23.5cm (c) 17.25cm (d) 15.5cm
33. Three students measured the focal length of a convex lens using parallel rays from distant
object. All of them measured the distance between the lens and the inverted image on
screen. Student A saw a sharp image on the screen and labelled the distance as f1
Student B saw a slightly larger blurred image on the screen and labelled the distance as f2
Student C saw a smaller blurred image on the screen and labelled the distance as f3.
The likely relationship between f1 , f2 and f3 would be ___________
(a) f1 f2 f3 (b) f1 < f2 and f3
(c) f3 < f1 < f2 (d) f1 < f2 and f1 f3
A f1
B f2
C f3
F1, f2, f3
(a) f1 f2 f3 (b) f1 < f2 f3
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(c) f3 < f1 < f2 (d) f1 < f2 f1 f3
34. While performing the experiment on tracing a ray of light passing through a rectangular
glass slab, the inference given by four students after measuring angles of incidence,
refraction and emergence is as __________ .
(a) angle of refraction is greater than angle of emergence
(b) angle of refraction is equal to angle of emergence
(c) angle of incidence is greater than angle of emergence
(d) angle of incidence is equal to angle of emergence
Which student has given correct inference ?
(a) A (b) B (c) C (d) D
(a)
(b)
(c)
(d)
(a) A (b) B (c) C (d) D
35. A student has to perform an experiment on tracing the path of a ray of light passing through
a rectangular glass slab for different angles of incidence. Which of the following figures
shows correct labelling so that he can get a correct measure of the angles of incidence and
the angles of emergence ?
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(a) A (b) B (c) C (d) D
(a) A (b) B (c) C (d) D
36. During the process of binary fission of amoeba –
(a) cytoplasm first divides followed by the division of nucleus.
(b) nucleus first divides followed by the division of cytoplasm.
(c) both nucleus and cytoplasm divide simultaneously.
(d) only nucleus divides while cytoplasm remains as it is.
(a)
(b)
(c)
(d)
37. Daughter cells produced as a result of asexual reproduction in amoeba are :
(a) exact copies of parent cell.
(b) totally dissimilar to parent cell.
(c) partially similar to parent cell.
(d) one is like and the other is unlike the parent cell.
(a)
(b)
(c)
(d)
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38. Which of the following figures shows budding in yeast :-
(a) (i) (b) (ii) (c) (iii) (d) (iv)
(a) (i) (b) (ii) (c) (iii) (d) (iv)
39. A pinch of yeast was added to a glucose solution and left overnight in a warm place. Next day a drop of the suspension was observed on a slide under a microscope. The expected result would be :-
(a) A (b) B (c) C (d) D
(a) A (b) B (c) C (d) D
40. A 60% sugar solution was found to be isotonic for raisins. When equal number of raisins were dropped by Ashok in solution A with 4g sugar in 10ml water, in solution B with 8g sugar in 10ml water, in solution C with 6g sugar in 10 ml; it will be observed that raisins are – (a) swollen in A and B and remain unchanged in C (b) swollen in A, shrink in B and remain unchanged in C (c) shrink in A, swollen in B and remain unchanged in C (d) shrink in A, remain unchanged in B and shrink in C.
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60%
A 4g 10 ml B 8g 10 ml C
6g 10 ml
(a) A B C
(b) A B C
(c) A B C
(d) A B C
41. 2g of dry raisins are soaked in water for 2 hours and the swollen raisins now weigh 3.5g.
The percentage of water absorbed by raisins is :
(a) 75% (b) 40% (c) 35% (d) 60%
2g 2
3.5g
(a) 75% (b) 40% (c) 35% (d) 60%
- o O o -
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