KUULCHAT
S.H.S SCIENCE MOCK
OBJECTIVE TEST
1.
Which of the following practices is a method of conserving the environment?
A.
use of pesticides
B.
overgrazing
C.
mining
D.
afforestation
Answer: D
Use of pesticides, overgrazing and mining destroy the environment
Overgrazing occurs when plants are exposed to intensive grazing for extended periods of time, or without sufficient recovery periods. It can be caused by either livestock in poorly managed agricultural applications, game reserves, or nature reserves.
Afforestation is the establishment of a forest or stand of trees (forestation) in an area where there was no previous tree cover to create forests.
Afforestation help slowing down global warming, by reducing CO2 in the atmosphere and introducing more O2.
2.
Which of the flowering reactions can produce salt and water only?
A.
Na3(aq)+ CH3C00H(aq)
B.
NaOH(aq) + NH3(aq)
C.
NH3(aq) + H2O(l)
D.
NaCl(aq) + AgNO3(aq)
Answer: A
3.
Which of the following practices is not applicable to vegetable production?
A.
budding
B.
pruning
C.
staking
D.
weeding
Answer: A
Prunning the selective removal of certain parts of a plant, such as branches, buds, or roots.
Weeding is the process to remove out the weeds. Weeds are unwantedvplants which grown along the useful crops.
Staking is the practice of driving a stake or rod into the ground close to a plant to provide support for its stems
Grafting and budding are techniques used to join parts from two or more plants so that they appear to grow as a single plant. In grafting, the upper part (scion) of one plant grows on the root system (rootstock) of another plant. In the budding process, a bud is taken from one plant and grown on another
4.
A precaution that has to be taken when using a liquid-in-glass thermoter is
A.
holding the bulb in hand when is use
B.
taking the readings quickly before thermal equilibrium is attained
C.
ensuring that the bulb is fully immersed in the surface
D.
ensuring that the bulb touches the vessel containing the surface
Answer: C
5.
The charges carries in a semi-conductor are
A.
holes only
B.
protons only
C.
holes and electrons
D.
hoes and neutrons
Answer: C
6.
Which force is greatly reduced when a lubricant is applied to the moving parts of an engine?
A.
gravitational force
B.
frictional force
C.
magnetic force
D.
centripetal force
Answer: B
Frictional force refers to the force generated by two surfaces that contacts and slide against each other. A few factors affecting the frictional force: These forces are mainly affected by the surface texture and amount of force impelling them together.
Ways of reducing friction
1. The use of bearing surfaces that are themselves sacrificial, such as low shear materials, of which lead/copper journal bearings are an example.
2. Replace sliding friction with rolling element friction, such as with the use of rolling element bearings.
3. Improve overall lubrication either by changing viscosity, using differing or improved additives or through the use of different lubricants themselves, i.e., synthetics, solids, etc.
7.
Which of the following animals is correctly matched with its young one?
A.
Sheep-calf
B.
Rabbit-kitten
C.
Goat-kid
D.
Pig-lamb
Answer: C
8.
The sedimentary rock is also referred to as
A.
stratified rock
B.
slated rock
C.
silical rock
D.
separated rock
Answer: A
9.
A ball and socket joint in the human body does not allow circular
A.
circular movement
B.
side to side movement
C.
up and down movement
D.
gliding movement
Answer: D
10.
In crop production, pests and parasites do not cause
A.
increase in yield
B.
total loss of crop
C.
stunted growth
D.
reduced market value
Answer: A
11.
Which of the following instruments is most suitable for measuring the thickness of razor blade?
A.
Metre rule
B.
Micrometer screw gauge
C.
Vernier callipers
D.
Surveyor's tape
Answer: B
12.
An advantage in the use of hard water is
A.
furing of kettle.
B.
blockage of water pipes.
C.
formation of scum.
D.
formation of strong bone
Answer: D
13.
Which of the following substances would have a pH below 7?
A.
Pure water
B.
Milk of magnesia
C.
Wood ash
D.
Lemon juice
Answer: D
14.
Which of the following indicate could be used to determine a PH of 7.4 of a solution?
A.
Litmus solution
B.
Methyl orange
C.
Phenolphthalein
D.
Universal indicator
Answer: D
15.
The relatives density of a subtance has no units because it is
A.
the ratio of mass to volume
B.
a ratio of densities
C.
always compared to the density of water
D.
a ratio of mass to density
Answer: B
16.
Which of the following crops is not a root vegetable?
A.
Carrot
B.
Ginger
C.
Lettuce
D.
Onion
Answer: C
17.
The arrangement of electrons in shells of an atom is called
A.
atomic structure
B.
periodic arrangement.
C.
electronic configuration
D.
electronic structure
Answer: C
18.
In cattle, anaemia, damaged skin and heart-water disease are caused by...
A.
liver-fluke
B.
roundworm
C.
tapeworm
D.
tick
Answer: D
19.
The component of white light which is most deviated when light is dispersed is
A.
blue
B.
red
C.
violet
D.
yellow
Answer: C
Dispersion of Light by Prisms
Visible light, also known as white light, consists of a collection of component colors. These colors are often observed as light passes through a triangular prism. Upon passage through the prism, the white light is separated into its component colors - red, orange, yellow, green, blue and violet.
The separation of visible light into its different colors is known as dispersion.
Different materials are distinguished from each other by their different optical densities. The optical density is simply a measure of the tendency of a material to slow down light as it travels through it.
The minimum the wavelength of the light,the more the deviation.
The visible colors from shortest to longest wavelength are: violet, blue, green, yellow, orange, and red.
Hence violet has the most deviation and red has the least deviation
20.
Cassava mosaic is spread by an insect called..
A.
capsid
B.
mealy bug
C.
moth
D.
whitefly
Answer: D
21.
Galvanized roofing sheets are iron coated with a thin layer of...
A.
gold
B.
plastic
C.
tin
D.
zinc
Answer: D
22.
Formation of rust could be facilitated by ...
I. the presence of moisture in the atmosphere
II. the presence of acids in the atmosphere
III. coating the surface of metals with oil
Which of the statements above is/are correct?
A.
I only
B.
II only
C.
I and II only
D.
II and III only
Answer: C
23.
An example of a crop which is usually nursed before transplanting is
A.
okro
B.
carrot
C.
garden egg
D.
water melon
Answer: C
24.
A stain of oil paint in a cloth can be best be removed by applying
A.
warm water
B.
kerosene
C.
salt solution
D.
soap solution
Answer: B
25.
Which of the following hydrocarbons is an alkyne?
A.
C2H2
B.
C2H4
C.
C3H6
D.
C3H8
Answer: A
26.
Which of the following characteristics is/are associated with the local breed of fowl? They
I. are slow growers
II. are normally kept on free range
III. have large body mass
A.
I only
B.
I and II only
C.
II and III only
D.
I, II and III
Answer: B
27.
A sample of KOH weighs 5.6g. Calculate the number of moles in the sample.
[K = 39; O = 16; H = 1]
A.
0.1
B.
0.2
C.
1.0
D.
5.6
Answer: A
28.
Which device is used to measure the population density of a plant species ?
A.
Pooter
B.
Quadrat
C.
Sweep net
D.
Wire mesh
Answer: B
29.
which of the following statement about breathing in human is correct?
A.
The same amount of nitrogen, more carbon dioxide and less oxygen is breath out than breathed in
B.
The same amount of nitrogen, less carbon dioxide and less oxygen is breathed out than breathed in
C.
More nitrogen, more carbon dioxide and less oxygen is breathed out than breathed in
D.
same amount of nitrogen, more carbon dioxide and more oxygen is breathed in than is breathed out.
Answer: A
30.
Which of the following properties is associated with ionic compound?
A.
are soluble in organic solvent
B.
conduct electricity in the molten state
C.
have low melting and boiling point
D.
consists of molecules
Answer: B
31.
The way of controlling endoparasites in cattle is through
A.
rotational grazing
B.
early morning grazing
C.
dipping the animals
D.
spraying the animals with recommended pesticides
Answer: C
32.
Which of the following functions are associated with mammalian skeleton? It...
I. stores calcium and phosphates.
II. protects vial internal organs.
III. produce red blood cells.
IV. stores proteins.
A.
I and II only
B.
III and IV only
C.
I, II, and III only
D.
II, III and IV only
Answer: C
33.
The gas in the atmosphere that absorbs ultra violet rays is
A.
carbon(IV) oxide
B.
nitrogen
C.
oxygen
D.
ozone
Answer: D
34.
An advantage of the use of hay over silage is that hay
A.
ensure the availability of feed all year.
B.
has laxative effect.
C.
has higher proportion of leaves, water and nutrients.
D.
is more palatable to livestock
Answer: A
35.
The hair on the skin of pig is known as
A.
bristle
B.
brush
C.
feather
D.
fur
Answer: A
36.
The pitch of a musical note is related to the note's
A.
loudness
B.
quality
C.
frequency
D.
intensity
Answer: C
Pitch
Pitch is a term used to describe how high or low a note a being played by a musical instrument or sung seems to be.
The pitch of a note depends on the frequency of the source of the sound.
Frequency is measured in Hertz (Hz), with one vibration per second being equal to one hertz (1 Hz).
A high frequency produces a high pitched note and a low frequency produces a low pitched note.
Loudness
Loudness depends on the amplitude of the sound wave.
The larger the amplitude the more energy the sound wave contains therefore the louder the sound.
Quality
This is used to describe the quality of the waveform as it appears to the listener. Therefore the quality of a note depends upon the waveform.
Two notes of the same pitch and loudness, played from different instruments do not sound the same because the waveforms are different and therefore differ in quality or tone.
37.
Which of the following mineral is not needed by crop in large quantities ?
A.
Calcium
B.
Iron
C.
Nitrogen
D.
Phosphorus
Answer: B
Crops obtain most of their carbon and oxygen from the air. Hydrogen is obtained from soil water. Carbon dioxide is especially important for plant growth. It is taken up by the plant from air through pores in the green leaves and combines with hydrogen from soil water, to form carbohydrate and other plant substances by energy from sunlight by the process of photosynthesis
Out of the 13 nutrients taken from the soil, Nitrogen, Phosphorus and Potassium are used in large quantities and hence known as primary nutrients.
Calcium, Magnesium and Sulphur are needed in moderate to small quantities but they play an important role in formation of plant tissues. These are known as secondary nutrients
The remaining are needed in very small quantities and are known as micro-nutrients. Plants need 16 elements to grow. They get these from air, water and soil.
| Type | Nutrients | Source |
| Macro-nutrient | Carbon | Air & Water |
| Macro-nutrient | Hydrogen | Air & Water |
| Macro-nutrient | Oxygen | Air & Water |
| Macro-nutrient | Nitrogen | Soil |
| Macro-nutrient | Phosphorus | Soil |
| Macro-nutrient | Potassium | Soil |
| Micro-nutrient | Calcium | Skeleton Elements |
| Micro-nutrient | Magnesium | Fertilizers and Manures |
| Micro-nutrient | Sulphur | Fertilizers and Manures |
| Micro-nutrient | Iron | Fertilizers and Manures |
| Micro-nutrient | Manganese | Fertilizers and Manures |
| Micro-nutrient | Boron | Fertilizers and Manures |
| Micro-nutrient | Zinc | Fertilizers and Manures |
| Micro-nutrient | Copper | Fertilizers and Manures |
| Micro-nutrient | Molybdenum | Fertilizers and Manures |
| Micro-nutrient | Chlorine | Fertilizers and Manures |
38.
An example of a saturated hydrocarbon is
A.
ethane.
B.
ethene.
C.
ethyne.
D.
ethanol.
Answer: A
39.
When alum is used in the treatment of water, it helps
A.
clay particles to coagulate
B.
the growth of algae
C.
heavy metals to precipitate
D.
remove odour in water
Answer: A
40.
The centre of gravity of a body is
A.
always at its centre
B.
a point where its total mass is always concentrated
C.
always at its end
D.
a point where it can be supported to be in equilibrium
Answer: B
41.
Acids react with many reactive metals to give off
A.
hydrogen gas
B.
oxygen gas
C.
ammonia gas
D.
carbon dioxide gas
Answer: A
42.
What is the unit for momentum
A.
kg m3
B.
Kg m s-1
C.
kg m s -2
D.
m s-1
Answer: B
43.
Which of the following use of substances is or are correct for esters? They are used as
I. solvents for quicker-dying paints.
II. flavors in food preparations and cosmetics.
drying agent in making textiles.
A.
I only
B.
II only
C.
II and II only
D.
II and III only
Answer: C
44.
Hazardous substances enter the human body through the
I. nose II. mouth III. skin
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: D
45.
The feature of coconut which adapts it for water disposal is its...
A.
succulent nature
B.
high perishability
C.
fibrous mesocarp
D.
soft mesocarp
Answer: C
46.
A gas soluble in water and lighter than air can be collected in the laboratory by
A.
upward displacement of air
B.
downward displacement of water
C.
downward displacement of air
D.
upward displacement of water
Answer: D
47.
The molecular formula of an alkene that contains four carbons atoms is
A.
C4 H4
B.
C4 H6
C.
C4 H8
D.
C4 H10
Answer: C
48.
In which of the following blood vessel is the pressure highest
A.
Hepatic artery
B.
Renal artery
C.
Dorsal aorta
D.
Vena cava
Answer: C
49.
The reason for adding sulphuric acid during the preparation of esters is to
A.
speed up the rate of reaction
B.
act as reducing agent
C.
decompose the products
D.
dehydrate the reaction
Answer: A
50.
The number of elements in nitric acid is
A.
2
B.
3
C.
4
D.
5
Answer: B
THEORY QUESTIONS
1.
(a) (i) State the method of preparing a salt from each of the following pairs of substances:
(α) dilute tetraoxosulphate(VI) acid and dilute sodium hydroxide;
(β) lead(II) trioxonitrate(V) and sodium chloride.
(ii) Write a balance equation for the reaction between lead(II) trioxonitrate(V) and sodium chloride.
(b) (i) What are tidal waves?
(ii) State four ways in which water could be contaminated.
(c) (i) State two ways in which legumes are important in crop production.
(ii) State three advantages of crop rotation.
(d) (i) State three qualities of a good thermometric liquid;
(ii) Give two precautions that must be taken when using a liquid-in-gas thermometer.
Solutions will soon be uploaded. Thank you.
2.
(a) (i) Define each of the following terms:
(α) compound;
(β) mixture.
(ii) State two differences between an element and a compound.
(b) Explain each of the following terms:
(i) greenhouse effect;
(ii) climate change.
(c)(i) What is electrical rectification?
(ii) Using simple wave diagram, explain half-wave rectification.
(d) State one way in which each of the following environmental factors is important to the life cycle of crops:
(i) rainfall;
(ii) temperature;
(iii) sunshine;
(iv) wind.
Solutions will soon be uploaded. Thank you.
3.
In an experiment to investigate the effect of sugar solution on onion tissues, pieces of epidermal tissues of equal sizes were peeled from inner fleshy leaves of onions. A number of the tissues were placed in six test tubes containing sugar solutions of different concentration. After a few hours the cells of the tissues were observed to be deformed. The percentage of the deformed cells in the various solutions are presented in Table 1 below.
Study the diagram carefully and answer the questions that follow.
(a) Plot a graph of percentage of deformed cells on vertical axis and concentration of sugar solution on the horizontal axis.
(b)Draw and label a diagram to show the appearance of the onion cell in the
(i) 0.5% concentrated solution;
(ii) 2.5% concentrated solution.
(c) Give one reason each for the appearance of the cells draw in (b).
(d)State two environmental factors that could have the same effect on a plant as the concentrated sugar solution.
Solutions will soon be uploaded. Thank you.
4.
(a) (i) Give three reasons why goats are not normally kept under the intensive system of management.
(ii) Name two diseases that affect rabbits.
(b) (i) Draw the structure of 11Na+.
(ii) State two differences between organic compound and inorganic compounds.
(c) (i) What are decomposer?
(ii) Name three common decomposers in an ecosystem.
(d) (i) Name three structures in the middle ear that help in the transmission of sound waves;
(ii) Mention two ways in which earmuffs are important.
Solutions will be uploaded soon. Thank you.
5.
(a) An electrical appliance rated 1.5kW, 240V is left running for hours. Calculate the
(i) current drawn;
(ii) electrical energy consumed.
(b) (i) In what two ways does mulching help to conserve the soil?
(ii) Give two examples of mulching materials.
(c) (i) What is pollution?
(ii) List three major atmospheric pollutants.
(d) (i) State two benefits of each of the following minerals to the human body:
(α) potassium;
(β) calcium.
(ii) Name one source of each of the minerals listed in(d)(i).
Solutions will be uploaded soon. Thank you.