End of Year Examination 2018 – 2019
Subject
:
Science
Grade & Section
:
Grade 8
Student’s Name
:
Length of Examination :
1 Hour 30 Minutes
Number of Pages
:
17 (including this cover page)
Date
:
Equipment Required:
Pen, pencil, ruler, calculator and protractor.
Instructions for Students:
Write in dark blue or black pen in the spaces provided on the Question Paper. Answer all
questions
Breakdown of marks
Question
Maximum
Marks
MCQ 1-15
Question
Maximum
Marks
15
22
5
16
4
23
6
17
9
24
9
19
5
20
6
21
16
22
5
Total Marks
Student
Score
Student Score
70
Paper checked by: ___________________________
Date: ______________________________________
Final %
Student
Score
1. Which of the following is required to produce proteins from glucose
A.
B.
C.
D.
Nitrates
Fatty acid and glycerol
Chlorides
Cellulose
2. What is the chemical test for starch?
A.
B.
C.
D.
Iodine solution turns blue black if starch is present
Iodine solution turns orange red if starch is present
Iodine solution turns purple if starch is present
None of the above
3. Name the cell in the leaf that helps in gaseous exchange
A.
B.
C.
D.
Epidermal cell
Palisade cell.
Stomata
None of the above
4. Use the figure below to answer question 4
Compared to radio waves, the wavelength gamma waves is:
A.
B.
C.
D.
E.
shorter.
longer.
faster.
slower.
the same
2
5. The position of the fish in Fig 1 looks different when observed from above the
pond. This can be explained by which property of light?
A.
B.
C.
D.
Total internal reflection
Refraction
Reflection
Dispersion.
Fig.1
6. Light refracts when traveling from air into glass because light
A. travels at the same speed in air and in glass.
B. frequency is greater in air than in glass.
C. frequency is greater in glass than in air.
D. travels in slower speed in glass than in air.
3
7. When light passes through air into glass, its angle of refraction is
A.
B.
C.
D.
less than its angle of incidence.
the same as its angle of incidence.
more than its angle of incidence.
can be more or less than its angle of incidence
Fig. 2
8. When light is refracted through glass prism it will gives rainbow colours. Out of
these which is scattered most?
A.
B.
C.
D.
Red
Orange
Yellow
Violet
9. Name the two parts of an atom found in the nucleus?
A. Proton and neutron
B. Proton and electron
C. Electron and ion
D. Neutron and electron.
10. Frequency is measured in…
A.
B.
C.
D.
Decibels
Newtons
Hertz
Waves
4
11.The amplitude of a sound wave affects which of the following?
A.
B.
C.
D.
The number of decibels.
The number of hertz.
The pitch of the sound.
The speed of the sound.
12.The gold foil experiment was set up by
A.
B.
C.
D.
J.J Thompson
James Chadwick
Ernest Rutherford
Isaac Newton
13.How many electrons are in the outer shell of the noble gases?
A. 8
B. 2
C. 7
D. 1
14. Name the group of elements on the periodic table that do not react and are
commonly called noble gases.
A. Group I
B. Group II
C. Group VI
D. Group VIII
15. An object has a mass of 48 g and it has a height of 5 cm a width of 2 cm and a
length of 5 cm. what is the density of the object?
A. .76g/cm3
B. .96g/cm3
C. 100g/cm3
D. 1g/cm3
[Total:15 Marks]
5
Section B: Structured Questions
16. The boxes show some parts of plants and the function of the parts.
Draw a line from each part to match its function.
Part
Function
Stomata
Photosynthesis
Leaf /
mesophyll
Transport of water &
miner
Root hair
Transpiration
Xylem
absorption of water from
soil
17) The Fig 3 shows a palisade cell.
6
[4]
(a)What is the specialized structure in the palisade cells?
_________________________________________________________________[1]
(b) Complete the word equation for photosynthesis.
Carbon dioxide + …………………
glucose + ………………
[2]
(c) Some students investigated the effect of light intensity on the rate of
photosynthesis. They used the apparatus shown in Fig 4.and interpreted the results as
shown in Table 1.
Fig. 4
The students:
•
placed the lamp 10 cm from the pondweed
•
counted the number of bubbles of gas released from the pondweed in 1 minute
•
repeated this for different distances between the lamp and the pondweed. The
Table 1 shows the students’ results.
7
Distance of
light in cm
Number of bubbles
per minute
10
84
15
84
20
76
40
52
Table 1.
(c)Interpret the result from the table with given numerical values. What is the content of
the bubble given out?
_____________________________________________________________________
_____________________________________________________________________
___________________________________________________________________[2]
(d) Why is there more Palisade cells in the upper upper layer of the leaf?
_________________________________________________________________[1]
(e)Give 3 factors which affect photosynthesis
___________________________________________________________________
___________________________________________________________________
_________________________________________________________________[3]
19. Darnell put a piece of a different metal in each of the four test tubes. She
poured10cm3 of hydrochloric acid onto each metal. Result is shown below in Fig.5
8
a) Look at the diagram above and explain how did you know that a reaction took
place
______________________________________________________________[1]
b) On the lines below, put the four metals in the order of how strongly they react
with the acid (Reactivity series)
[4]
1 ………………………………………..
Most reactive
2. ……………………………………….
3 ……………………………………….
4 ……………………………………….
Least reactive
[Total:5]
20. Group 1 and 2 elements shows a variety of physical and chemical properties.
The picture below shows a group 1 element reacting with water giving a flame in Fig
6.
Fig 6
9
b) State 3 safety measures while handling Alkali metals.
[3]
c) Rubidium of Group 1 elements are not stored in school. Why?
___________________________________________________________________
_________________________________________________________________[1]
d) A small lump of potassium is removed from its container of paraffin oil. Why
Group 1 elements are called soft metals?
___________________________________________________________________
___________________________________________________________________
_________________________________________________________________[1]
e) Why are group 1 elements stored under kerosene/paraffin oil
___________________________________________________________________
_________________________________________________________________[1]
[Total:6]
21 a) Complete the following chemical equation
magnesium + hydrochloric acid _______________ _______________ +
hydrogen
[1]
10
b) What is the atomic number of the following elements
C__________
N__________
Na_________
[1]
c) i) Distinguish between an atomic number and mass number
Atomic
Number____________________________________________________
Mass
Number___________________________________________________
[2]
ii) Identify four trends in Group 7 – the halogens from the table below.
Element
Atomic
Electronic Mass
number
structure
number
Fluorine,
9
2,7
19
Chlorine,
17
2,8,7
Bromine,
35
2,8,18,7
Colour
Melting
Boiling
point/ °C
point/ °C
Pale yellow
-220
-188
35
Yellow/green
-101
-34
80
Brown
-7
59
Trend
1_______________________________________________________________
Trend
2_______________________________________________________________
Trend
3_______________________________________________________________
11
Trend
4_____________________________________________________________[4]
d) Write the electronic configuration of the Sodium. (Use Periodic Table)
Lithium:
____________________________________________________
Sodium:
____________________________________________________
[2]
e) Draw the electronic structure of lithium and Sodium. (Use Periodic Table )
[4]
f) Complete the following sentences.
i) Protons have a __________ charge
ii) Neutrons have a _________ charge
[2]
[Total:16]
12
22 a) One sunny day, some children use a rounder’s post as in Fig.7 to make
shadows in their playground.
When light shines on the rounder’s post, a shadow forms.
Where does the light come from?
[1]
____________________________________________________
(b) The rounder’s post makes a dark shadow. The rounder’s post makes a
dark shadow. What are the conditions for formation of a dark shadow?
___________________________________________________________[2]
(c) The children draw round the shadow of
the rounder’s post every half hour from 9:30
until 12 noon. They measure the length of
each shadow and record their results in this
Table 2.
Time (am)
Length of shadow (cm)
9:30
146
10:00
130
10:30
116
11:00
109
11:30
106
12:00
103
Table 2
(d) What happened to the length of the shadow during the morning?
___________________________________________________________________
13
(e)
The children make a line graph to show the results from the morning.
Continue the line on the graph to show how the length of the shadow
would change between 12 noon and 2:30pm.
[1]
[Total:5]
23 a) Figure below shows a ray of Light striking a plane mirror.
In the figure given
i.
ii.
iii.
iv.
Draw a normal to the mirror
Draw the path of the reflected ray
Mark and measure the angle of incidence
Mark and measure the angle of reflection
14
[4]
c) Give one example for a surface which gives Regular reflection
d) Give one example for a surface which gives Irregular reflection
[Total:6]
24. Sound is a form of energy. It is produced by vibration. An electric bell is
ringing inside a glass jar as shown in Fig 8.
A vacuum pump is used to remove the air from inside the jar. The bell continues to
vibrate.
a) What is observed as a result of the air being removed from the jar?
Fig.8
___________________________________________________________________
_________________________________________________________________[1]
15
b) Explain this observation.
___________________________________________________________________
_________________________________________________________________[2]
c) Do light waves or sound waves travel faster in air?
________________________________________________________________[1]
d) Describe an example that supports your answer to part iii).
_________________________________________________________________[1]
e) A student whistles three notes into a microphone connected to an
oscilloscope. An oscilloscope shows the shape and size of a sound wave.
f) Use words from the list below to complete these sentences.
Less than
than
(i)
(ii)
the same as
greater
The amplitude of the whistle 1 is ……………………..the amplitude of
whistle 2.
[1]
The wavelength of whistle 1 is ………………..……….the wavelength of
whistle 2.
[1]
16
g) Compare the loudness and pitch of whistle 2 and whistle 3.
Loudness_________________________________________________________[1]
Pitch_____________________________________________________________[1]
[Total:9]
17
18