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fyt; pj; jpizff; sk; Department of Education Central Province uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj ; pa khfhz fyt ; pj;
uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj ; pa uOHu
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; pj; jpizff wOHdmk
; sk; Department fomd¾;fïka
of Education ;m<d;a
Central Province uOHu =j wOHdmk fomd¾;fïka;=j kjj ; pa khfhz fyt ; pj;
uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj ; pa khfhz kj;jpa khfhz fy;tpj; jpizf;fsk;
fyt ; pj; jpizff ; sk; Department of Education Central Province uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj ; pa khfhz fyt ; pj;
uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj; pa khfhz fyt; pj; jpizff ; sk; Department of Education Central Province uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj; pa khfhz fyt; pj;
uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj
; pa Department of Education Central Province
khfhz fyt
; pj; jpizff ; sk; Department of Education Central Province uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj
; pa khfhz fyt
; pj;

G.C.E. (O/L) Practice Test - 2019 34 E I

Grade 11 Science 1 Hour
Note:
— Answer all questions.
— In each of the questions 1 - 40, pick one of the alternative (i), (ii), (iii), (iv) which you consider as correct
or most appropriate.
— Mark a cross (x) on the number corresponding to your choice in the answer sheet provided.
01. Standard International unit of moment of force is,
(1) J (2) W (3) Nm (4) J s-1

02. Which of the following adaptation shown by the "Nagadarana" seed to disperse by animals?
(1) Presence of hairs (2) Presence of hooks
(3) Presence of fibre like structures (4) Presence of wing like structures

03. The derivative of Ethene that use in PVC Production is,

(1) Tetrachloroethene (2) Carbon Tetrachloride (3) Chloroethene (4) Ethene

04. A disease caused by infection of inner mucous layer of stomach is,

(1) Bronchitis (2) Atherosclerosis (3) Gastritis (4) Hepatitis

05. An electron microscopic diagram of a cell is given below. Which organelles repesent by X and Y?
(1) Ribosome, Nucleus
X (2) Mitochondria, Golgibodies
(3) Nucleus, Chloroplast
Y (4) Mitochondria, Endoplasmic reticulum
06. An artificial polymer with cross links is,
(1) Polyvinyl chloride (2) Polystyrene
(3) Polytetrachloro ethene (4) Vulcanised rubber
07. What is the momentum of an object of mass 500 g, moving at a velocity of 10 ms-1?
(1) 5 kgms-1 (2) 10 kg ms-1 (3) 20 kgms-1 (4) 30 kgms-1
08. Which graph represent a motion of positive acceleration.
s s s s

t t t t
(1) (2) (3) (4)
09. A - B AB is a molecule with co-valent bonds. According to given Lewis structure, Which statement
is correct regarding the electro negativity of A and B?
(1) Electro negativity is equal in A and B (2) Electro negativity in A is greater then B
(3) Electro negativity in B is greater then A (4) Data is not sufficient to predict about Electro
negativity.
10. Part of energy is released as heat during respiration. The rest is stored as ATP. Which of the following is
not a function of ATP?
(1) Store energy (2) Produce energy (3) Release energy (4) Act as an energy source
-2
11. A wooden block of 200 kg floats on water. What is the upthrust force act on the block? (g = 10ms )
(1) 20 N (2) 200 N (3) 2000 N (4) 20000 N
Grade 11 Science Page 01
 12. Longitudinal section (L. S) of a flower is given below. Which letters represent the place of pollen
production and the place of ovule production in respectively.
(1) a and b (2) b and d (3) c and a (4) b and c
13. Main heat exchange methods in solar water heater are,
(1) Convection, radiations (2) Conduction, radiation
(3) Conduction, convection (4) Conduction, convection, radiation
14. If an ovum is not fertilized, the changes in uterus can divided in to 3 phases as follows.
Day 0 4 14 28
Menstrual phase Proliferation phase Secretory phase
Which of the above phase/phases can be affected by progesterone level in blood?
(1) Secretary phase and proliferation phase (2) Menstrual phase and secretory phase
(3) Only in proliferation phase (4) Only in menstrual phase
15. The element "P" is in group III and 3rd period in the periodic table. It has following properties,
3+
A - electronic configuration of P is 2, 8, 3 B- "P" element removes electrons and from P ion
C - P, is more affinity to form acidic oxides
The correct statements about 'P' are,
(1) A and B (2) B and C (3) A and C (4) A, B, C all
16' Resistant of a domestic electric appliance is 200 W. If 2A current passes through it, what is the power
of that electrical appliance?
(1) 200 W (2) 300 W (3) 400 W (4) 800 W
rd
17. Some oxides formed by the elements in 3 period of the periodic table are given below.
A B C
SiO2 MgO Al2O3
Which answer contains the ascending order of the acidity of above oxides?
(1) A, B, C (2) C, A, B (3) B, A, C (4) B, C, A
18' AB is a light weighted rod. The minimum moment of force to rotate the rod at C is 20 Nm
If the rod used as couple of forces, what is the minimum force that should be given at one end
of the rod? A x x B
(1) 10 N (2) 20 N (3) 25 N (4) 30 N C
20 N
19' Salt production and cinnamon oil extraction are some of the main productions in Sri Lanka.
Which answer contains accurate separation methods?
Cinnamon Salt
(i) Evaporation Crystallization
(ii) Steam distillation Crystallization
(iii) Fractional distillation Evaporation
(iv) Simple distillation Steam distillation
20. An object moves 100 m in a straight path and turns back and move 30m along the same path. Total
distance and displacement of that object in respectively are,
(1) 100 m, 30 m (2) 130 m, 70 m (3) 70 m, 30 m (4) 130 m, 130 m
21. Frequency of this wave is, Displacement (m)
(1) 10 Hz (2) 20 Hz
(3) 30 Hz (4) 40 Hz Time (S)
0.2
22' Not a specific property of water for the contribution of maintaining the life,
(1) Act as a solvent (2) Act as a respiratory medium
(3) Act as non - polar solvent (4) Act as a transport medium
23. In case of current leakage in domestic circuit, which device should be turned off, to disconnect power
supply.
(1) Overload Circuit Breaker (2) Isolator (3) Miniature Circuit Breaker (4) Residual Current Circuit Breaker

Grade 11 Science Page 02

 24. Following features are belong to several groups of kingdom Animalia.
A. - 4 chambered heart, complete double circulation
B - Triploblastic, Coelomic, has a water vascular system
C - Body cover is moistened by mucous, body is not divide into segments
D - Triploblastic, Coelomic, Some species possess wings
ABCD groups in respectively are,
(1) Aves, Echinodermata, Mammalia, Arthropoda
(2) Echinodermata, Arthropoda, Mollusca, Mammalia
(3) Mammalia, Echinodermata, Mollusca, Arthropoda
(4) Arthropoda, Mollusca, Echinodermata, Mammalia
25. Correct statement regarding the setup given in the diagram is,
(1) Cu electrode is the Anode Zn Cu
(2) Oxidation takes place at the Zn electrode
(3) Zn electrode is the positive terminal Diluted H2SO4
(4) Oxygen gas releases at Cu electrode Acid
26. Force acting on an object and the frictional force against it is plotted in a graph as follows.
A, B, C in respectively are, Frictional force
B
(1) Dynamic friction, static friction, limiting friction C
(2) Limiting friction, dynamic friction, static friction A
(3) Static friction, Limiting friction, dynamic friction
(4) Dynamic friction, Limiting friction, static friction
The force applied (N)
27. Four main types of chemical reactions are stated in the following chart.
Which type of chemical reaction is suitable for the
A+B C AB + CD AC + BD blank?
Chemical (1) Double displacement reaction
Reactions (2) Single displacement reaction
............... (3) Chemical combination reaction
AB + C BC + A
(4) Chemical decomposition reaction
28. Skin, lungs, kidney are main excretory organs of human body. Which excretory substance is
released by all excretory organs mostly ?
(1) Water (2) Urea (3) Uric acid (4) Carbondioxide
29. An object is in equilibrium under the action of 3 forces 10N, 20N and 5N. What is the resultant force
on the object at the equilibrium state?
(1) 20 N (2) 10 N (3) 5 N (4) 0 N
30. 100 ml of NaOH solution contains 10% mass of NaOH. Find the number of NaOH moles contain in the
-3
solution. (Na = 23, O = 16, H = 1, density of solution is 1 gcm )
(1) 0.1 mol (2) 0.20 mol (3) 0.25 mol (4) 0.32 mol
31.Function of the given neuron is,
(1) Carry impulses from sensory organ to central nervous system
(2) Carry impulses from central nervous system to effector
(3) Maintain the co-ordination between sensory neuron and motor neuron
(4) Send impulses from spinal cord to brain
32. Which of the following can be demonstrated by the given circuit?
(1) action of light sensitive switch (2) action of heat sensitive switch
(3) action of signal amplifier (4) action of a switch sensitive to dark
33. Some features of bio chemical substances are given below,
A. They are inorganic compounds B. They transport through blood
C. They need in small concentrations D. They stimulate target organs
Which are correct regarding hormones?
1) A, B, C, D all (2) A, B, C only (3) A, C, D only (4) B, C, and D only.

Grade 11 Science Page 03

34. Given below is an illustrated diagram of an ionic 2+
compound. Name of the compound is,
(1) NaCl (2) MgCl2
(3) CaCl2 (4) Na2O

35. Following graphs shows the typical population growth curve and growth curve of human population
Select the incorrect statement about A and B. Carrying Capacity
(1) B shows the changing patten in growth

Number of
Organisms
Number of
Organisms
curve of human population
(2) A shows the changing pattern in growth
curve of typical population
(3) In A, constant number of organisms can 1 2 3 4 1 2
Time Time
be seen after a definite time period A B
(4) First phase of A and first phase of B shows different growth patterns
36. Select the correct graph, that can be obtained by the Cathode Ray Oscilloscopes in the given circuit,

Cathode Ray
͠

Oscilloscopes
(1) (2) (3) (4)
37. Consider the following statement and the reason regarding aerobic respiration and anaerobic respiration.
Statement - Organisms receive more energy by aerobic respiration then anaerobic respiration
Reason - Glucose molecules breakdown partially during anaerobic respiration while glucose
molecules breakdown completely during aerobic respiration
Which of the following is correct regarding statement and reason?
(1) Statement is correct, reason is incorrect (2) Statement is incorrect but reason is correct
(3) Statement is correct, reason explains it (4) Statement is correct, but reason does not explain it
38. By using electroplating method, B metal is protected as the cathode by using the metal A.
(Cathodic protection) Select the correct setup for that.
(1) (2) (3) (4)
B A A B A B B A
Solution Solution
of the salt of the salt
of A of B
39. X and Y are two identical balloons. X filled with air and tied up with a thread. X balloon is connected to
Y using a tube, When the knot at X releases, some statements regarding pressure in X and Y balloons are
given below.
A. Air flows from X to Y, until the pressure at both balloons become equal X Y
B. Pressure inside the balloons are greater than the atmospheric pressure.
C. If X is dipped in a water container, air flows further to Y balloon. Knot
The correct statements are,
(1) Only A, B (2) Only B, C (3) Only A, C (4) A, B, C All

40. Consider the following statements on environmental pollution.

A. All types of environmental pollutants are hazardous
B. Pollution of one natural resource interconnected with pollution of another natural resource
C. All influences affect on human society are depend only on the environmental pollution.
Correct statements are,
(1) A and B (2) B and C
(3) A and C (4) A, B, C All

******

Grade 11 Science Page 04

 ishÆ ysñlï weúßKs$ KOg; gjpg;GupikAilaJ $ All Rights reserved
uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj ; pa khfhzfyt; pj; jpizff; sk; Department of Education Central Province uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj ; pa khfhz fyt ; pj;
uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj ; pa uOHu
khfhzfyt m<d;a
; pj; jpizff wOHdmk
; sk; Department fomd¾;fïka
of Education ;m<d;a
Central Province uOHu =j wOHdmk fomd¾;fïka;=j kjj ; pa khfhz fyt ; pj;
uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj ; pa khfhz kj;jpa khfhz fy;tpj; jpizf;fsk;
fyt ; pj; jpizff ; sk; Department of Education Central Province uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj ; pa khfhz fyt ; pj;
uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj; pa khfhz fyt; pj; jpizff ; sk; Department of Education Central Province uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj; pa khfhz fyt; pj;
uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj
; pa Department of Education Central Province
khfhz fyt
; pj; jpizff ; sk; Department of Education Central Province uOHu m<d;a wOHdmk fomd¾;fïka;=j kjj
; pa khfhz fyt
; pj;

G.C.E. (O/L) Practice Test - 2019 34 E II

Grade 11 Science 3 Hours
Note:
— This Paper consists of 2 parts, A and B.
— Part A contains structured essay questions. Answer them on the given space.
Part A - Structural Essay
01. A. Following picture shows a man-made environment according to the concept of sustainable
development and environmental management.

Plant
Nursery

(I) What is the meaning of sustainable development?''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(ii) According to the picture, write 2 instances where the sustainable development concept is applied.
1' ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
2' ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(iii) It is expected to minimize carbon foot print and food milage under the sustainable development.
a. What is carbon foot print?
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
b. Write a strategy used to minimize food milage in the above picture.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
iv) Write an action that has been taken in this building for energy management.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
B. Some factors affect for non contagious diseases are given in following chart.
High blood pressure
(I) What are non-contageous diseases?
Use of tobacco Lack of physical exercise
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Non Communicable ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Consuming liquor Dieses Obecity
+ + + + + + + -----------------------
(ii) Name a non-contageous disease caused by
+ + + + + + + ----------------------
+ + + + + + --------------------- increasing of blood cholesterol level.
+ + + + + + -------------------
+ + + + + -----------------
+ + + + +-------
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Increase of blood + + ++ -------- - Increase of Cholesterol
glucose level
++ (iii) Write 2 risk factors from the chart, that can
cause cancer'
Less consumption of vegetable & fruit
1' ....'''''''''''''''''''''''''''''''''''''''''''''''''''''
2' .....'''''''''''''''''''''''''''''''''''''''''''''''''''

Grade 11 Science Page 01

 C. Rough diagram of N2 cycle is given below. Answer the questions using the diagram.
(N2)

Plants & Animals

Fecal matter & excretory

Denitrification products of animals & plants Y X
Z
+
NH4
-
NO2
-
NO3
(i) What is the process denoted by Z ?
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(ii) Write the processes denoted by X and Y
X''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Y''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(iii) Mention the main human activity that affect the Nitrogen cycle.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(iv) Write a step to minimize environmental pollution as a student.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
02' A. Student observed an onion peel, through light microscope and sketch the cells as follows
(i) Name an organelle that he could identify in the tissue
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(ii) a) A friend of the student said that the cells in the diagram
cannot considered as a typical cell. Do you agree with that idea?
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
b) Write the reason for your answer.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''..........
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''..........
(iii)Chromosomes of a species undergoes meiosis cell division. Each daughter cell receives 12
chromosomes.
a) Write a main difference between meiosis cell division and mitosis cell division.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
b) Fill in the blanks according to the cell division in (iii)

.................

} Step 1 ...................... division

}
................. .................

12 12 ................. .................
Step 2 ...................... division
c) Name a type of cell that undergoes meiosis cell division in living organisms.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
B. Some of the inherited characteristics of human population are given below.
ability to fold the tongue Fused or free ear lobes Polydactyly Syndactyly
(a) (b) (c) (d)
(i) Write the letters which denotes common inherited characters, out of above characters.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(ii) Information about one of the Mendal's experiment using garden pea plants is given below.
Pure breeding inflated pod plants crossed with pure breeding constricted pod plant of garden pea
plant and obtained F1 generation. Then the plants in F1 generation self pollinated to obtain F2
generation. The results are given below.
Constricted pod plants 246
Nature of the pods and the number obtained
Inflated pod plants 741
a) What is meant by gene expression?
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Grade 11 Science Page 02

2
 b) Write the gene expression of F1 generation using R inflated pods and r for constricted pods.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(iv) How do you show that the above results (ii) are agree with Mendal's monohybrid cross?
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(v) Write diseases caused due to sex linked recessive gene and gene mutation respectively.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
03. X and Y are two metals. Observations of their reactions are given bellow.
Metal X Metal Y

Copper Sulphate Copper Sulphate

Solution dil. HCl acid Solution

A B C D
Test tube Observation
A. Reduces the blue colour of the solution.
B. A precipitate occur at the bottom of test tube.
C. No observable reaction.
D. Reduces the blue colour of solution, Formation of a precipitate.
(i) Arrange the metals (copper) Cu, X and y according to their reactivity in descending order.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(ii) Out of B, C, D in which test tube a reaction does not occur?
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(iii) Write the balanced chemical equation for the reaction take place in A by considering the
valency of x as 1.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(iv) You are given Hydrogen Peroxide and Potassium Permanganate chemicals. Which gas
can produce by decomposition of above chemicals?
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(v) How do you identify the above mentioned gas?
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
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B. A mass of 29.26g of NaCl dissolved in water to make a solution of 200ml volume. Following activity
A B
was conducted by using the above solution.
----
---- ----
(i) Name the A and B gasses collected in the setup. ----
----
----
----
----
----
----
----
----
---- ----
-----------------------------------
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' ----------------------------------
---------------------------------
---------------------------------
---------------------------------
--------------------------------- NaCl
--------------------------------
--------------------------------
' ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' -------------------------------
------------------------------
------------------------------
------------------------------
------------------------------ Solution
(ii)Name the substance that can be used as anode and cathode
respectively.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' + -
(iii)Write the overall cell reaction of the above setup.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
C. (i) Calculate the amount of moles of NaCl that used to make the above NaCl solution.
(Na = 23, Cl = 35.5, O = 16, H = 1)
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''

Grade 11 Science Page 03

 (ii)If all amount of NaCl spent for electrolysis, calculate the amount of moles of A produced
during the reaction.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(iii)What is the SI unit of measuring amount of matter in chemical calculations.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
04. A. A and B figures shows the activities done by 3 students with equal masses (m) to prove Newton
laws. P Q R S
M M M M M

x y x y
Instance A Instance B
Trolleys are moving by exerting forces by the hands of students.
(i) a) What can you say about the forces P and Q in instance A?
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
b) What can you say about the forces R and S in instance B?
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(ii) Compare the distances traveled by x and y trolleys in figure B.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(iii)Write the relevant Newton's law to explain the motion of A and B figures.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(iv)Initial velocity of an object is 40ms-1. It was at a higher elevation. Draw the velocity time graph
for the motion, when it is falling down.

B. (i) Write the type of waves used to operate in the given apparatus / equipments.
Equipment Type of wave used
a. Solar water heater ..........................................................................
b. Solar panel ..........................................................................
c. Remote controller ..........................................................................
d. SONAR ..........................................................................
(ii) Write a specific feature of the wave type that used in solar panel.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(iii)Given below is a graph of a wave formed on water. A E
a)Mark the amplitude (a) and wave length (l) in the given diagram.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' B
o D F
b) Write another instance where this type of wave motion occurs C
in day to day life.
'''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
-2
C. A person drown a bucket of water with 2 kg to a height of 6m. (g = 10ms )
(i) Write a suitable expression for the work done by a force.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(ii) Calculate the work done by man in the above instance.
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(iii)Calulate the energy consumed by man, when 20 such buckets of water lifted up.

''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
(iv) Write the power in standard unite, if he spend 4 seconds to lift up a bucket of water.

Grade 11 Science Page 04

 Part - B
— Answer 3 questions only. Sun Light
05. A. Some of the plant functions including
photosynthesis is given in the diagram. Leaf
CO2
* Answer the questions using the diagram. Z
(i) (a) Explain the process of photosynthesis . Z Tissue

n
Transportatio
(b)Write the process in (a) using a balanced
Y Tissue

n
chemical equation.

Transportatio
(ii) Write the steps of an experiment to identify
X Tissue Cells
the starch stored in leaves.
Carbohydrate
B.(i) Name the Z tissue in which the photosynthesis Water
(Storage Tissue)
takes place.
(ii) According to the ability of cell division, what is the common name given to x and y tissues?
(iii)Name the non-living cells in x and y tissue.
(iv) Write a deference between cells mentioned in answers (i) and (iii).
(v) It was observed chlorosis in some mature leaves of the above plant. What can be the mineral
deficiency responsible for above symptoms?

C. Following diagram shows the structure of blood circulatory system.

(i) Which vein contains highest oxygen concentration?
Lungs
(ii) Write a difference between the composition of F and G
blood vessels
B
A (iii) Name the valve at the beginning of the vessel 'A' that
start from heart.
(iv) Lymphatic system is a part of blood circulatory system.
(a)Name a blood cell, that present in lymphatic system.
(b)Write the main function of lymphatic system.

C Liver D
Intestine

G
F E

Legs

D. Maintenance of constant internal environment is important for efficient biological functions.

(i) What is the name given for the above process.
(ii) (a) One of the factors to maintain constant internal environment is temperature. Write 2 other
factors.
(b) Following chart shows, how the human body temperature maintain constantly. Write one
suitable mechanism to the blanks A and B.
al
t u re o f intern
ra
Tempe reases A
When ironment dec
env
Normal Body Temperature 370C Normal Body Temperature 370C
Whe
n Te B
envi mperatu
ronm r
ent i e of inte
ncre r
ases nal
(iii) (a) What is the main bio molecule , that helps to maintain body temperature constantly?
(b) Name the constituent elements of above mentioned bio molecule.

Grade 11 Science Page 05

06. A.
A, D, E, G, I, J are 6 elements belong to 2nd and 3rd periods. They are not in order and given letters are not
their standard symbols. Atomic number of those elements are given in the following table.
Element A D E G I J
Atomic number n-5 n-2 n-1 n n+1 n+2
*Element 'E' belongs group III. When making P - type semiconductors, 'E' is used as a doping element.
(i) (a) Write the electronic configuration of element 'E'
(b) What is the stranded symbol of element 'E' ?
(ii) (a) Explain electro negativity.
(b) Draw a rough graph to show the variations of electro negativity values of A, D, E, G, J
elements with atomic numbers.
(iii) Properties of a compound that formed by element I and Hydrogen are given below.
— forms covalent compounds — Molecule is polarized.
Draw the bonding structure of the above molecule and mark the polarity.
B. A, B, C solutions were tried to identify using two indicators in the laboratory. The results obtained
are given in the table.
Solution colour change in Litmus pH value
A Red litmus changed to blue 12
B Blue litmus changed to red 6
C Blue litmus changed to red 2
(i) What is the main difference between acid and a base?
(ii) Categorize A, B, C solutions according to their strength of acidity.
(iii)What is the name of the reaction that occurs between A and C?
(iv) Write an instance where the above type of reaction (iii) applied in day to day life.

C. Following apparatus were arranged to identyfiy a factor that affected the rate of reaction. Equal
masses of CaCO3 large and small pieces, and equal volume of Dil.HCl acid in same concentration
were used here.
(i) Define the rate of reaction. Equal baloons
(ii) Which factor for rate of reaction will be tested
CaCO
by the experiment? CaCO
3
Large Pieces
(iii)Which tube shows the highest rate of reaction,
3
Small Pieces

out of A and B test tubes?

(iv)What is expected by keeping test tubes in water A
container? B

D. Energy (Enthalpy) diagram for a chemical reaction is

given below. A B + C
Test tubes with Dil. HCl Water container
Heat energy
-1
(kJmol )

B + C (products) (i) a) According to heat changes, name the type of reaction.

b) Give reasons for your answer.
(ii) Write an example for the above type of a reaction.
Energy
A (Reactants)

Grade 11 Science Page 06

 07. AB is a straight rod, which arranged to rotate at 'C' point. A 20N mass is hung at A,
(i) What is the force exerted by the electro magnet on B piece of Iron (1N) to balance AB rod?
(ii) (a) When the object at A dipped in water, It was 1m
2m B
observed that the force need to balance the rod, A 1N
C
was less. What is the reason for that?
(b) Find the pressure act on the object 'A' by water +
when it is dipped in water at 2m depth. 9V
3 -2
(density of water = 1000kg/m , g = 10ms ) -
(c) Explain how the upthrust changes when the dipped 20N
object moved further down towards the bottom of the vessel. S
B. (i) Write a strategy to increase the strength of the electromagnet.
conductor
(ii) The picture shows the way of current flows through an electric
N S
conductor which placed in a magnetic field. Copy the diagram on
your answer script and mark the direction of the motion of the conductor.
C. Following diagram shows a transformer,
(i) Name the type of transformer given in the diagram.
(ii) Write the ratio between turns in primary coil and
turns in secondary coil.
(iii)Write an instance where the above type of S
transformer is used in day to day life. 240V 6V
0 0
D. Mass of 1kg of a metallic ball heated from 25 C to 275 C.
(i) When heating what change could be expected in the ball, other then heating.
(ii) The heated ball put into a container with 500g of water. Initial temperature of water was 250C and
0
final Temperature was 75 C
(a) Calculate the amount of heat absorbed by the water.
(b) Calculate the loss of heat at that time (Specific heat capacity of water = 4200 Jkg -1oC-1)
-1o -1
(Specific heat capacity of metal = 600 Jkg C )
08. A. Given below are some optical instruments. Answer the questions using them.
Concave mirror Bi-convex lens Plain mirror

Convex mirror Bi-concave lens Glass block

(i) Name the relevant optical instrument that can be used to get images in following instances.
Instance Optical Instrument/ Instruments
(a). Real, inverted, magnified image formed on the
same side of the object
(b). Virtual, upright, magnified image formed on
the same side of the object
(c). Always Virtual, upright, diminished images formed
on the side of the object
(d).Virtual, upright, images formed equal to the
same size of the object

(ii) Draw the ray diagram for the image forming in (i)(a) instance.
(iii)Following diagram shows how a light ray refracted from air to glass .

Normal
B
(a) Draw the ray diagram to show how the OB ray refracted
Glass block
to air at the point B by copying the diagram on to your answer script
O
(b) Which property of glass and air is used in drawing the above Normal
ray diagram. A Air
(iv) Write the refractive laws of light.

Grade 11 Science Page 07

B.A rough sketch of 3 Domain classification which was introduced by Carl Woese is given below.
(a) Name the suitable kingdom or classification
Domain Bacteria Archaea Eukarya
levels to the places A, B, D, E.
(b) Write a similarity and a dissimilarity between
Animalia the Domain bacteria and Eukarya.
Kingdom Protista A Plante
(c) Write an importance of doing a classification
Flowering plants Non-Flowering plants as given in the chart.

B C D E
Eg: Coconut Eg:Jack Eg:Cycus

F G

C. (i) Cellular organization, nutrition, respiration, sensitivity growth and development are some
features of living organisms. Write 2 other living features that are not mentioned above.
(ii) Explain the characteristic of Growth and Development.
(iii)Some living organisms cannot be identified as living or non living separately. State 2 such
instances.
(iv)Write a feature that can be used to separate F and G.

09. A. When a person carrying a packet of table salt with a mass of 500 g. But the salt spread on the ground
as the bag was broken. After that he collected all the salt and went home.
(i) Write 2 substances that could be mixed with collected salt.
(ii) What type of a mixture is that collected salt?
(iii) (a) Write a mechanical method that can be used to clean the salt mixture.
(b) What is the name of the method that can be used in laboratory to extract most purified salt.
(iv) The mass of a certain substance that mixed in the above salt mixture is 10 g. Write the
composition of above mixture as a mass fraction.
(v) (a) The maximum amount of salt that can dissolve in 1cm3 of water at 200C is 2 g, Calculate the
solubility of salt at that time.
0
(b) State whether the solubility of salt could be increase or decrease at 25 C. Give reasons.
(c) Write a method of dissolving salt easily at home.
B. The diagram shows a circuit that arranged using 3 dry cells with 1.5 V each. 3V
V
X, Y, Z are 3 identical bulbs. Assume that there is no resistance in conductors.
x
(i) Which bulb lights up with more brightness when the switch S is ON.
6W
(ii) State the method of y and z bulbs are connected in the circuit. S
(iii) What is the method of fixing y, z bulbs to the x bulb?
y z A
C. If x bulb is removed and 6W resistance is replaced. Consider the cross 6W 6W
sectional area of the resistance in wire as (a) and length as (l)
(i) When a current passes through the circuit, potential difference across the x bulb was 3V,
although 4 dry cells with 1.5V were connected.(Total voltage is not equal to 6V)
Explain your answer.
(ii) What change should be done in the circuit to obtain 6V supply using the same apparatus given in
the diagram.
(iii) Calculate the current flow through x resistor when 6V voltage is supplied.
(iv) (a) Calculate the current flows through resistor when the length of it increases twice.
(b) Explain the brightness of the bulbs with reference to the resistance.
(v) Calculate the power of bulb 'y' in the circuit.
*****

Grade 11 Science Page 08