"NENASA"
Science
(Q'S Paper)
Grade 11
Name
Time: One hour
Class
Part I
Which of the following correctly states about the characteristics of skeletal muscles?
(1) Striated, Voluntarity controlled
(2) Striated, Involuntarity controlled
(3) Un striated, Voluntarity controlled
(4) Un striated, Involuntarity controlled
02
The factors that are affeted for the photosynthesis is tested using the controlled experiments. Which is
the factor amount following can not be tested by using a controlled experiment.
(1) Carbon dioxide
(2) Chlorophyll
(3) Light
(4) Water
03
Sulphuric acid which is a strong acid, ionizes in water as shown below.
4
2H2SO4 (aq) "
2H (aq) + SO4 (aq)
What is the total number of ions in one liter of 0.5 mol dm-3 H2SO4 solution.
(1) 0.5 x 6.022 x 1023
(2) 1.0 x 6.022 x 1023
(3) 1.5 x 6.022 x 1023
(4) 3.5 x 6.022 x 1023
04
The following diagram shows the wave produced in a stretched string. The amplitude and the wave
length accordingly.
(1) 2.0 cm and 5.0 cm
(2) 2.0 cm and 10.0 cm
2 cm
(3) 10.0 cm and 2.0 cm
cm
5.0 cm
(4) 4.0 cm and 10.0 cm
05
A student has illustrated the refraction of a beam of light incident on a convex lens in the following
diagrams.
Which diagram shows the instance that is unlikely to occur?
N
EN
A
SA
01
F
06
F
F
F
F
(1)
(2)
(3)
(4)
Consider the following statements about catalysts.
A Catalysts increase as well as decrease reaction rates.
B Though catalysts take part in the chemical reaction, they are not consumed during the reaction.
C A small amount of the catalyst is adequate for a large amount of reactants.
Of the above, the true statements are,
(1) only A and B
(2) only B and C
(3) only A and C
(4) all A, B and C
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N. Thilini Cooray
A small glass ball and a big iron ball were dropped on to a porcelain surface from the same height. The
porcelain surface created at the point at which the iron ball hit it. No such crack was caused by the
glass ball. Of the following, greatness of which quantity of the iron ball than of the glass ball could be
the reason for this?
(1) velocity
(2) volume
(3) momentum
(4) accleration
08
An atom of a certain contains four energy levels find with electrons. Its outermost energy level
contains two electrons the period and group to which that element belongs respectively are,
(1) 2 and II
(2) 2 and IV
(3) 4 and II
(4) 4 and IV
09
What property from the following changes with the changing of the gravitational force?
(1) Mass
(2) Weight
(3) Volume
(4) Density
10
What is the example which frictional force is decreased?
(1) Having grooves on tyres.
(2) Rough skin on palm
(3) Fixing roller bearings.
(4) Using circular coir pore (walala) to climb trees.
11
The cell division processes A and B given in the figure
regarding sexual reproduction are respectively.
(1) Mitosis and mitosis
(2) Mitosis and meiosis
(3) Meiosis and meiosis
(4) Meiosis and mitosis
SA
07
Father
A
B
Ovum
Sperm
A
Mother
Zygote
B
EN
Infant
A part of the human digestive system is shown in the diagram.
Which is the correct statement regarding the organ "X"?
X
(1) It secretes maltase enzyme.
(2) It produces bile.
(3) Red blood cells are produces in it.
(4) It acts as an endocrine gland.
13
pH value can be 7 in,
(1) Lime water
(3) Distilled water
14
N
12
(2) Sodium chloride solution
(4) Hydrochloric acid
Which of the following statement is true regarding an exothermic reaction?
(1) Energy of the reactants is equal to the energy of products.
(2) Energy of the reactants is less than the energy of products.
(3) Energy of the reactants is higher than the energy of products.
(4) Energy should be supplied for starting the reaction.
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N. Thilini Cooray
Test tube with the glass tube given in the figure is immersed on a vessel with water and headed for a
small period of time.
Three statements regarding the observations of this experiment are give below.
X - The water level in the glass tube rises up gradually from B
and stops.
Glass tube
Y - The water level in the glass tube drops down gradually
B
from B and stops.
Z - The water level in the glass tube drops down from B and
then rises up and exceeds the level B.
Test tube
Of the above statements,
Coloured water
(1) X is true
(2) Y is true
(3) Z is true
(4) all X, Y, and Z are false.
16
Consider the statements given below regarding the electrical accessories used in a domestic electrical
circuit.
A - Electricity supply to the house can be disconnected when necessary bu the survive fuse.
B - Trip switch is placed at a point before the service fuse.
C - Electricity is distributed to various parts of the house by the fuse box.
D - Electricity supplied to the house is controlled by the electric meter.
(1) A, B and C only
(2) A and C only
(3) A and D only
(4) B and D only
17
Select the response which states correctly the number of molecules of water present is 9g of water.
23
-1
(H = 1, O = 16, Avogadro Constant = 6.022 × 10 mol )
23
18 × 6.022 × 1023
(1) 6.022 × 10
(2)
9
9 × 18
(3) 9 × 6.022 × 1023
(4) 9 × 18 × 6.022 × 1023
18
Hydrogen sulphide (H2S), reacts with sulphur dioxide (SO2) according to the following balanced
A
EN
18
SA
15
chemical equation.
2H2S + SO2
2H2O + 3S
The amount of moles of sulphur dioxide that reacts with one mole of hydrogen sulphide is,
(1) 0.5
(2) 1.0
(3) 1.5
(4) 2.0
Which statement given below is incorrect regarding photosynthesis?
(1) Water is a raw material necessary for photosynthesis
(2) Photosynthesis takes place only in to presence of light.
(3) Chlorophyll is essential fo photosynthesis.
(4) Glucose and carbon dioxide are formed as products of photosynthesis.
20
An instance of two horizontal forces, acting on a small object on a smooth horizontal place is shown
in the diagram. The correct statement about the movement of the object is that,
(1) The object is stationary.
(2) The object retards towards the direction of the force 2N.
2N
1N
(3) The object accelerates towards the direction of the force2N
(4) The object moves with constant velocity in the direction of the force 2N.
N
19
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N. Thilini Cooray
"NENASA"
Science
(Q'S Paper)
Grade 10
Name
01
Time: Three hour
Class
The velocity - time graph relevant to the motion of an ambulance from the base hospital to the general
hospital is given below.
SA
Answer the questions given below using the velocity - time graph or by any other method (For your
calculation, as some that the ambulance has moved in a straight line.)
V(ms-1)
60
0.0
(a)
If the displacement of the ambulance with uniform velocity is 15 Km (15000m), find the time
that it traveled with uniform velocity?
(c)
Find the distance between the two hospitals.
(d)
The surgery had to be started within 30 minutes from the instant the patient has been transfer
from the base hospital. If the doctors in the general hospital were ready and other necessities
were fulfilled for the surgery were the doctors able to start the surgery time? Explain your
answer.
EN
A
(b)
A, E, G J, L, M Q and R are 8 consecutive elements in the periodic table. The atomic number of all
these elements are less than 20. E naturally occurs in allotropic forms and one of the forms conducts
electricity. (Here the given symbols are not the standard symbols of the elements)
(i)
What is the element E?
(ii)
Of the above elements.
N
02
(s)
40
20
What is the uniform velocity with, the ambulance has traveled?
(a) Which element occurs as a nobel gas room temperature?
(b) Which element has the highest electro negativity?
(c) Which element is at the top most level of the activity series?
(iii) Draw the lewis dot diagram of a molecule formed by the element G with Hydrogen.
(iv) Of the above elements, Which element is most suitable to produce a sample of H2 gas on the
laboratory?
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N. Thilini Cooray
(v)
Write the balanced chemical equation for the reaction of R with steam.
first ionization energy
(vi) Copy the diagram given below into your answer script and draw sketch of the variation of first
ionization energy of the above elements. It is not necessary to show the atomic number and the
values of ionization energy. (It is sufficient to mention only the elements)
atomic number
The figures 1 and 2 illustrate the diagrams of electron microscopic structures of a plant cell and
an animal cell.
SA
(i)
Figure 1.
A
(a) Identify them and write on the dotted lines what they are.
Figure 2 .
(b) State two features that the plant cell possesses which the animal cell does not have as
shown in the above diagram.
(2)
EN
(1)
(c) State one function performed by each of the part X and Y within the cell.
Function of X
Function of Y
(ii)
(a) There are two ways by which the nucleus divides during cell division. State one of them.
.
(b) What is the number of chromosomes that the daughter cell receives, from the
chromosomes present in the nucleus of the mothe cell during the cell division you
mentioned in (iv) (a) above?
N
03
.
(c) The chromosomes are present in the nucleus in pairs. They are referred to as homologous
chromosomes. What is a pair of homologous chromosomes.
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N. Thilini Cooray