KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
Water drains faster through sand than clay because
A.
sand particles are rougher.
B.
sand contains more air space.
C.
clay particles are smoother.
D.
clay particles are bigger.
Answer: A
2.
The function of the platelets in the circulatory system of humans is to
A.
transport oxygen.
B.
transport carbon dioxide.
C.
defend the body.
D.
cloth the blood.
Answer: D
3.
The carpel of a flower is made up of the following parts except
A.
filament.
B.
ovary.
C.
style.
D.
stigma.
Answer: A
4.
Weeds on a by school farm could be controlled by
A.
handpicking
B.
mowing
C.
ploughing
D.
tilling
Answer: B
5.
In electronic circuits, LEDs are used to indicate the absence or presence of
A.
emitter and collector
B.
electric current
C.
p-n junction
D.
voltage source
Answer: B
6.
A mixture of sugar and water could be separated by
A.
decantation.
B.
evaporation.
C.
filtration.
D.
sublimation.
Answer: B
7.
What is the chemical symbol for silver?
A.
Ag
B.
Au
C.
Si
D.
S
Answer: A
8.
Which of the following members in a food chain will receive the least energy?
A.
Lizard
B.
Grass
C.
Grasshopper
D.
Hawk
Answer: D
9.
Fertilisation in humans usually occurs in the
A.
ovary.
B.
uterus.
C.
vagina.
D.
fallopian tube.
Answer: D
10.
An example of a vegetable crop is
A.
cocoa.
B.
cotton.
C.
potato.
D.
tomato.
Answer: D
11.
Which of the following substances is capable of neutralizing an acid?
A.
Vinegar
B.
Water
C.
Sodium chloride
D.
Sodium hydroxide
Answer: D
12.
The colour of a soil profile determines the
A.
depth at which implements are set
B.
drainage ability of the soil
C.
fertility of the soil
D.
type of tool to use
Answer: C
Color is an important physical property of soils that allows us to know some of its most important characteristics, such as mineral composition, age and soil processes, chemical alteration, carbon accumulation, the presence of hurrified organic matter. The soil may be black, red, yellow or coppered colored. From the color of the soil, we get an ideal of the fertility, drainage and other such properties.
13.
Which of the following animal parasites could be controlled by hand picking?
A.
Liver fluke
B.
Tapeworm
C.
Tick
D.
Roundworm
Answer: C
14.
Fruit dispersed by wind
A.
Have hairs
B.
Are sticky
C.
Are succulent
D.
Have hooks
Answer: A
15.
The gas produced when glucose is oxidized during aerobic respiration is
A.
Hydrogen
B.
Nitrogen
C.
Oxygen
D.
Carbon dioxide
Answer: D
16.
Which of the following processes removes carbon from the atmosphere?
A.
Respiration
B.
Burning
C.
Decomposition
D.
Photosynthesis
Answer: D
Respiration
The chemical breakdown of organic food substances such as glucose in the living cells to release energy with or without molecular oxygen.
Burning
Combustion, or burning,is a high-temperature exothermic redox chemical reaction between a fuel (the reductant) and an oxidant, usually atmospheric oxygen, that produces oxidized, often gaseous products, in a mixture termed as smoke.
Decomposition
The process or effect of simplifying a single chemical entity into two or more fragments.
Photosynthesis
Photosynthesis is the process by which green plants manufacture food (starch/glucose) using carbon dioxide and water in the presence of sunlight and chlorophyll.
17.
An example of a non-living tissue used in osmosis experiment is
A.
cellophane
B.
filter paper
C.
potato
D.
polythene
Answer: A
18.
An example of mixtures that can be separated by the method of filtration is
A.
sugar in water.
B.
sand in water.
C.
oil in water.
D.
ink in water.
Answer: B
19.
Which of the following statements about shadow formation is correct? It shows that light rays can
A.
be diffused.
B.
travel in a straight line.
C.
be refracted.
D.
be reflected.
Answer: B
20.
In electronic circuits, LEDs are used to indicate the absence or presence of
A.
voltage source.
B.
p-n junction.
C.
electric current.
D.
emitted and collector.
Answer: B
21.
The term leaching in soils refers to .....
A.
accumulation of organic matter
B.
decomposition of plant material
C.
fixation of nitrogen
D.
removal of soil nutrients by water
Answer: D
22.
Producers in an ecosystem are plants that
A.
attract insects
B.
feed on other plants
C.
feed on dead materials
D.
manufacture their own food
Answer: D
23.
The ovules in a flower develop to form the
A.
fruit.
B.
leaf.
C.
seed.
D.
stem.
Answer: C
24.
Which of the following factors contribute to early parenthood?
I. Illiteracy
II. Poverty
III. Peer pressure
IV. Lack of parental care
A.
I and II only
B.
II and III only
C.
III and IV only
D.
I, II, III and IV
Answer: D
25.
Which of the following soil type has the highest capillarity?
A.
Clay
B.
Loam
C.
Sand
D.
Silt
Answer: A
One of the problems with clay soil is its slow permeability resulting in a very large water-holding capacity. Because the soil particles are small and close together, it takes water much longer to move through clay soil than it does with other soil types. Clay particles then absorb this water, expanding as they do so and further slowing the flow of water through the soil. This not only prevents water from penetrating deep into the soil but can also damage plant roots as the soil particles expand.
26.
The structure which enables a fish to breate in water is
A.
buccal cavity
B.
gills
C.
swim bladder
D.
lungs
Answer: B
Fish gills are organs that allow fish to breathe underwater. Most fish exchange gases like oxygen and carbon dioxide using gills that are protected under gill covers on both sides of the pharynx. Gills are tissues that are like short threads, protein structures called filaments
27.
The pressure in fluids
A.
acts differently in all directions
B.
acts upwards at any point
C.
decreases with depth
D.
increases with depth
Answer: D
28.
Which of the following particles constitute matter?
I. Atoms
II. Molecules
III. Ions
A.
I only
B.
II only
C.
II and III only
D.
I, II and III
Answer: D
29.
Which of the following substances is a mixture?
A.
Water
B.
Sodium chloride
C.
Sodium chloride solution
D.
Iron filing
Answer: C
30.
Which of the following type of teeth is used by mammals to tear food material?
A.
Canines
B.
Incisors
C.
Molars
D.
Premolars
Answer: A
31.
The process used to separate a mixture of iron filings and sulphur is
A.
magnetic attraction
B.
sublimation
C.
distillation
D.
evaporation
Answer: A
By magnetization we can separate sulfur and iron fillings. Take a magnet near to the mixture it will attract iron fillings and the remaining thing will be sulfur.
32.
The joule is the S.I unit for
A.
energy.
B.
force.
C.
power.
D.
pressure
Answer: A
33.
In which of the following devices is electrical energy transformed into light energy
A.
Electric bell
B.
Fluorescent tube
C.
Lantern
D.
Radio
Answer: B
A fluorescent lamp, or fluorescent tube, is a low-pressure mercury-vapor gas-discharge lamp that uses fluorescence to produce visible light.
34.
A structure in the human reproductive system which stores sperms temporarily is the
A.
epididymis.
B.
penis.
C.
scrotum.
D.
vulva.
Answer: A
35.
The farming system that makes effective use of available soil nutrients in a growing season is
A.
crop rotation.
B.
land rotation.
C.
mixed cropping.
D.
mixed farming.
Answer: A
36.
The warming and safety signs on chemical containers are usually represented by a symbol placed within a
A.
circle.
B.
rectangle.
C.
square.
D.
triangle.
Answer: D
37.
The term leaching in soils refers to
A.
accumulation of organic matter.
B.
decomposition of plant materials.
C.
fixation of nitrogen.
D.
removal of soil nutrients by water.
Answer: D
38.
Which of the following statements about a force are correct? It
I. is measured in newtons.
II. is measured in newton-metre.
III. can start a motion.
IV. can change the direction of a moving body.
A.
I and II only
B.
I and III only
C.
I, III and IV only
D.
I, II, III and IV
Answer: C
39.
The unit of potential difference
A.
ampere
B.
watt
C.
ohm
D.
volt
Answer: D
Unit of potential difference is joule per coulomb, given the name volt (V) after Alessandro Volta. The familiar term voltage is the common name for electric potential difference. Keep in mind that whenever a voltage is quoted, it is understood to be the potential between two points.
40.
Steel is an alloy of iron and
A.
aluminium.
B.
carbon.
C.
silicon.
D.
gold.
Answer: B
THEORY QUESTIONS
1.
(a) In an experiment the surfaces of three iron nails were cleaned dry and placed in three separate test tubes A, B and C as shown in the diagram.
Study the diagram carefully and answer the questions that follow.
After three days the nail in the test tube A was found to have rusted while the nail in test tubes B and C did not rust.
(i) Suggest an aim for the experiment.
(ii) Why was the water in test tube B boiled?
(iii) State the function of the oil on top of the water in test tube B.
(iv) What is the purpose of the calcium chloride in test tube C?
(v) Why did the nail in test tube A rust?
(vi) Why did the nail in test tube
(α) B not rusted?
(β) C not rusted?
(vii) From the experiment, explain why oil is applied on the surface of a metal to prevent rusting.
(b) In an experiment, the following activities were carried out on two green leaves A and B. Leaf A was taken from a plant placed in the sunlight for some time while leaf B was taken from a plant placed in a dark cupboard for 24 hours.
Activity
I. Leaves dipped in boiling water for 1 minute;
II. Leaves dipped in warm alcohol;
III. Leaves washed in cold water;
IV. Leaves dipped in iodine solution.
After dipping in the iodine solution, it was observed that leaf A changed colour.
Study the activities carefully and answer the questions that follow.
(i) Suggest an aim for the experiment.
(ii) Explain briefly why each of the following activities were carried out:
(α) I;
(β) II;
(γ) III.
(iii) State the colour change of leaf A.
(iv) Explain why leaf A changed colour?
(v) Why is it necessary to de-starch the plant before starting the experiment?
(vi) From the above experiment, what conclusion(s) can be drawn.
(c) You are provided with two dry soil samples A and B, a measuring cylinder, beakers, funnels, filter paper, beam balance, stop watch and water. With the aid of a labelled diagram, describe an experiment to find out which of the two soil samples can hold more water.
(d) The diagram below is an illustration of an experiment that was carried out. In the experiment three pins 1, 2 and 3 were fixed with candle wax onto a metal bar and one end of the bar was heated by means of boiling water. A, B and C are thermometers inserted in holes along the bar to measure the temperature at the various points.
Study the diagram carefully and answer the questions that follow.
(i) Suggest an aim for the experiment.
(ii) What is the temperature of the boiling water?
(iii) State the observation that would be made about the pins 1, 2 and 3.
(iv) State the observation that would be made about the temperatures recorded by the thermometers A, B and C.
(v) State how heat from the sun is transmitted to the earth.
Solution will be soon uploaded. Thank you.
2.
(a) (i) What is a food chain?
(ii) Why is the plant in any food chain referred to as producer?
(iii) What is the term given to the other organisms that depend directly or indirectly on the producer for food.
(b) The diagram below is an illustration of the picture obtained on a screen when an opaque object is placed in the in the path of a light source.
Study the diagram carefully and answer the questions that follow.
(i) Name each of the shadows that is cast on the screen:
(α) A;
(β) B.
(ii) What does the shadow of the object cast on the screen illustrate?
(c) Describe briefly how a sample of pure sugar could be obtained from a mixture of sugar and sand.
(d) State three ways by which soil can be conserved.
Solutions will soon be uploaded. Thank you.
3.
(a) State one function each of the following parts of the human reproductive system:
(i) Penis;
(ii) Ovary;
(iii) Oviduct;
(iv) Testis;
(v) Uterus;
(b) (i) What is electrical conductor?
(ii) List two substances which are insulators.
(c) State three ways of maintaining soil fertility.
(d) Write word equation for each of the following chemical reactions:
(i) Oxygen and hydrogens;
(ii) Nitrogen and hydrogen;
(iii) Sodium and chlorine.
Solutions will soon be uploaded. Thank you.
4.
(a) State three functions of the female reproductive system in humans.
(b) (i) What is the role of a capacitor in a circuit.
(ii) Give two examples of a compound machine.
(c) (i) What is Integrated Pest Management?
(ii) State two advantages of practicing integrated pest management.
(d) (i) State two classes of mixtures.
(ii) Classify each of the following substances under the classes stated in (i)
(α) bronze;
(β) when perfume is sprayed into the air.
Solutions will soon be uploaded. Thank you.
5.
(a) A body of mass 100kg is raised to a height of 2m above the ground.
(i) State the name of the energy possessed by the object by reason of the new position.
(ii) Calculate the value of this energy. [g=10ms-2
(b) (i) What is matter?
(ii) State two of the states of matter.
(c) (i) Describe the nature of a loamy soil.
(ii) Name any two plants nutrients.
(d) (i) State the causative organism for each of the following diseases:
(α) cholera;
(β) tuberculosis.
(ii) State one method of prevention of cholera.
Solution will soon be uploaded. Thank you.
6.
The diagram below is an illustration of a fish.
Study the diagram carefully and answer the questions that follow.
(a) (i) Identify the fish.
(ii) Name each of the parts labeled I, II, III and V.
(iii) Name that habitat of the fish.
(iv) Explain how each of the parts labelled III and VI enables the fish adapt to its habitat.
(b) The diagram below is an illustration of a section through the soil.
Study the diagram carefully and answer the questions that follow.
(i) What does the diagram represent?
(ii) Name each of the parts labelled I, II, III, and IV.
(iii) Which part of the diagram:
(α) is the richest in humus?
(β) is the habitat for soil organisms?
(γ) undergoes weathering?
(iv) What is the effect of heavy rainfall on the part labelled I?
(c) The diagram below is an illustration of an electrical circuit.
Study the diagram carefully and answer the questions that follow.
(i) Name each of the parts labelled I, II, IV, VI.
(ii) State the energy transformation that takes place in:
(α) I
(β) IV
(iii) State the S.I units of the quantity measured by each of the parts labelled:
(α) III
(β) V
(iv) State the function of the part labelled VI.
(d) In an experiment, equal volumes and equal concentrations of dilute hydrochloric acid and dilute sodium hydroxide solutions were each placed in different test tubes.
Read the following statements carefully.
I. Both red and blue litmus papers were dipped into each of the solutions in turns.
II. Equal volumes of the solutions were mixed to obtain a third solution.
III. Both red and blue litmus papers were dipped into the third solution.
Use the information provided to answer the following questions.
(i) Explain briefly how you can identify each of the solutions
(α) Hydrochloric acid
(β) Sodium hydroxide
(ii) State the types of reaction that occurred when the two solutions were mixed.
(iii) What type of solution was formed when the reaction stated in (ii) occurred?
(iv) State what would be observed when both red and blue litmus papers were dipped into the third solution.
(v) Explain how the solid portion of the solution named in (iii) could be obtained.
Solutions will soon be uploaded. Thank you.