KUULCHAT
SCIENCE MOCK
OBJECTIVE TEST
1.
One benefit of technology to industrialization is
A.
environmental pollution.
B.
reduction in skilful labour
C.
provision of machinery.
D.
increase in cost of production of goods.
Answer: C
2.
Power is defined as the
A.
ability to do work.
B.
force to move an object.
C.
rate of doing work.
D.
ability to replace energy used.
Answer: C
Power =
3.
The equation Carbon (IV) oxide + water Chlorophyll→Light Glucose + Oxygen, represents
A.
Breathing
B.
Diffusion
C.
Photosynthesis
D.
Respiration
E.
Transpiration
Answer: C
4.
Which of the following environmental factors can cause the fastest rate of water loss from leaf surfaces?
A.
High humidity
B.
Wet wing
C.
Still air
D.
Low temperature
E.
Dry air
Answer: E
5.
Which of the following processes should be carried out first when separating a mixture of sand and common salt?
A.
crystallization of the salt
B.
dissolution of the salt
C.
distillation of the solvent
D.
filtration of the mixture
E.
sublimation of the solute
Answer: B
6.
The part of the banana plant used in reproduction is called
A.
sucker
B.
rhizome
C.
stem
D.
tuber
E.
bulb
Answer: A
7.
A solution in which no more solute will dissolve at a particular temperature is said to be
A.
concentrated.
B.
dilute.
C.
saturated.
D.
insoluble.
E.
unsaturated.
Answer: C
Solution is a homogenous mixture of solute and solvent.
The solute is the substance that is being dissolved, while the solvent is the dissolving medium.
A saturated solution can be defined as a solution in which a solvent is not capable of dissolving any more solute at a given temperature.
A dilute solution contains a small amount of solute in a large amount of solvent.
A concentrated solution contains a large amount of solute dissolved in a small amount of solvent.
8.
Casual and loose sex life can result in the spread of
A.
AIDS.
B.
cholera.
C.
poliomyelitis.
D.
malaria.
E.
tuberculosis.
Answer: A
9.
Which of the following energy changes takes place in ringing bell?
A.
Potential to kinetic
B.
Potential to sound
C.
Mechanical to sound
D.
Sound to light
Answer: C
The mechanical energy is used to vibrate the metallic body of the ring-bell. When the bell vibrates, it produces sound energy.
10.
The disease caused by the Plasmodium parasite is
A.
Cholera.
B.
malaria.
C.
onchocerciasis.
D.
schistosomiasis.
Answer: B
11.
Which of the following plants is propagated vegetatively?
A.
apple
B.
coconut
C.
pawpaw
D.
pear
E.
sweet potato
Answer: E
12.
The swollen shoot disease of cocoa is caused by
A.
fungus.
B.
virus.
C.
bacteria.
D.
protozoa.
Answer: B
13.
Which of the following chemical equations is balanced?
A.
N2+H2→NH3
B.
N2+3H2→NH3
C.
N2+H2→2NH3
D.
N2+3H2→2NH3
Answer: D
14.
Which of the following types of water would be most contaminated by waste substances?
A.
Rain water
B.
Stream water
C.
Borehole water
D.
Pipe borne water
Answer: B
15.
The method used to separate an insoluble solid from a liquid is
A.
crystallization.
B.
distillation.
C.
filtration.
D.
sublimation.
Answer: C
FILTRATION
16.
Which of the following food substances would produce a red precipitate when heated with Millon's reagent?
A.
Banana
B.
Groundnut
C.
Orange juice
D.
Pineapple juice
Answer: B
Millon's reagent is a solution primarily used to detect the presence of tyrosine, an amino acid, in proteins. It works by reacting with the phenol group of tyrosine, producing a characteristic red or reddish-brown precipitate or coloration upon heating. The reagent is made by dissolving mercury in concentrated nitric acid and then diluting with water.
From the options provided, groundnut is the only protein and can test positive with Millon's reagent.
17.
When a stick is dipped into a pool of water, it appears to
A.
be longer than its length.
B.
ben away from the surface.
C.
be seen straight in the water.
D.
bend towards the surface.
Answer: D
18.
When the testa of a soaked bean is removed, the seed is seen to be made up of mainly
A.
micropyles
B.
hilum
C.
radicle
D.
embryo
E.
cotyledons
Answer: E
19.
The consequences of the greenhouse effect on humans include
I. flooding of coastal cities
II. desertification of fertile areas
III. increased number of storms
IV. increased use of fossil fuels
A.
I, II, III and IV
B.
II and III only
C.
I, II and III only
D.
I and II only
Answer: D
20.
The weight of an object is the
A.
force with which the sun pulls it
B.
force with which the moon pulls it
C.
force of the object when gravity is not acting on it
D.
force with which gravity acts on it
E.
mass of the object
Answer: D
21.
Which of the following is not a mammal?
A.
Whale
B.
Bat
C.
Cat
D.
Hen
E.
Mouse
Answer: D
22.
An example of a lever in which the effort is applied at the middle is a
A.
wheelbarrow.
B.
pair of forceps.
C.
pair of scissors.
D.
beam balance.
Answer: B
Forceps
23.
Which of the following is true about a first class lever?
A.
The load is between the effort and the pivot
B.
The pivot is between the effort and the load
C.
The effort is between the pivot and the load
D.
The load is on the pivot
E.
There is no pivot
Answer: B
24.
Power is defined as the rate at which
A.
energy is used.
B.
temperature rises.
C.
a body travels.
D.
a body cools down.
Answer: A
Power =
25.
Regular brushing of teeth is primarily done in order to
A.
keep the mouth fresh
B.
clear away food particles from the teeth
C.
remove bad smell in the mouth
D.
kill bacteria in the mouth
E.
control the flow of saliva
Answer: B
26.
The fixed point of a lever at which turning takes place is the
A.
pivot
B.
effort
C.
load
D.
handle
E.
machine
Answer: A
27.
The human sex cells are produced in the
A.
scrotum and uterus.
B.
testis and ovary.
C.
penis and vagina.
D.
scrotum and ovary.
Answer: B
28.
The testis in mammals produces
A.
blood.
B.
lymph.
C.
sperms.
D.
urine.
Answer: C
29.
Which of the following processes is used to separate insoluble solids from liquids?
A.
Crystallization
B.
Evaporation
C.
Filtration
D.
Sublimation
Answer: C
30.
Which of the following statements are reasons for conserving energy?
I. Insufficient production of energy
II. Increasing demand of energy
III. Limiting production of carbon (IV) oxide
A.
I and II only
B.
I and III only
C.
II and III only
D.
I, II and III
Answer: B
NOTE: One must still conserve energy even when demand of energy is not high. Conversation will ensure that the resources used for the generation of the energy is reserved for future generations
31.
The atom of an element has 4 protons and 5 neutrons in its nucleus. How many shells are occupied in the atom?
A.
1
B.
2
C.
3
D.
4
E.
5
Answer: B
The number of protons equals the number of electrons in a neutral atom.
Since there are 4 protons, the number of electrons is also 4
The first shell of an atom takes a maximum of 2 electrons and the subsequent shells take maximum of 8 electrons
For 4 electrons, the first shell will take 2 electrons and the second shell will take the remaining 2 electrons.
Hence the atom has 2 shells.
32.
During an eclipse of the moon, the
A.
Sun and the moon are on one side of the earth
B.
Earth and the sun are on one side of the moon
C.
Sun comes between earth and moon in a straight line
D.
Earth comes between sun and moon in a straight line
E.
Moon comes between sun and earth in a straight line
Answer: D
33.
The portion of air which acts as a solvent is
A.
oxygen.
B.
carbon (IV) oxide.
C.
nitrogen.
D.
an inert gas.
Answer: C
Since the concentration of nitrogen (N2) is maximum in air (78%). Hence, the solvent is Nitrogen gas and other gases like Oxygen and other gases act as solute.
34.
Heat from the sun reaches the earth by
A.
conduction
B.
convection
C.
radiation
D.
reflection
E.
refraction
Answer: C
35.
When gases are heated they
A.
melt.
B.
sublime.
C.
decrease in volume.
D.
decrease in intermolecular forces
Answer: D
When a particle is heated
The intermolecular forces are the attractions between the molecules when temperature increases it develops more distance between molecules and because of this attraction decreases, resulting intermolecular force decreases.
Intermolecular forces decreases on heating as the particles gain energy and start vibrating.
The intermolecular space between particles increases and they overcome the intermolecular forces.
Hence, the intermolecular forces decrease on heating because kinetic energy increases and space between particles increases.
36.
What force makes a ripe mango fall from a tree?
A.
Force of tension
B.
Magnetic force
C.
Electrostatic force
D.
Gravitational force
Answer: D
Gravitational force
The force due to which any matter is attracted towards the centre of the Earth is known as the force of gravity. The mango fell due to the force of gravity of Earth.
37.
Which of the following processes is an example of osmosis?
A.
Spreading of perfume in a room.
B.
Absorption of food nutrients into the small intestines.
C.
Spreading of potassium permanganate in water.
D.
Absorption of water into the root hairs.
Answer: D
38.
Stem cutting is used in propagating cassava because it
A.
gives rise to roots and leaves
B.
stores food in the stem
C.
gives rise to big tubers
D.
gives rise to small tubers
E.
stores food in the leaves
Answer: A
39.
In making ornaments and jewellery, non-reactive metals are preferred because they
A.
are corrosive.
B.
are attractive.
C.
do not retain their lustre.
D.
do not react with atmospheric oxygen.
Answer: D
40.
The sun and the planets form the
A.
atmosphere.
B.
constellation.
C.
milky way.
D.
solar system.
E.
universe.
Answer: D
THEORY QUESTIONS
1.
(a)
Copy the table below and write the usual host of each of the parasites given in the spaces provided.
| Parasite | Host |
| Plasmodium | |
| Capsids | |
| Tapeworm | |
| Dodder |
(b)
(i)
Name three classes of food
(ii)
For each of the following food substances, give the major class of food to which it belongs:
Starch, milk, margarine, sugar
(c)
Write the chemical formula for each of the following compounds:
(i)
calcium hydroxide
(ii)
zinc chloride [zinc (II) chloride]
(iii)
sodium nitrate [sodium trioxonitrate (V)]
(iv)
calcium carbonate [calcium trioxocarbonate (IV)]
(v)
potassium sulphate [potassium tetraoxosulphate (VI)]
(d)
(i)
Define the term viscosity
(ii)
Describe an experiment you performed to compare the viscosities of two liquids A and B.
(a)
| Parasite | Host |
| Plasmodium | Man |
| Capsids | Cocoa plant |
| Tapeworm |
1. Cow
|
| Dodder | Milk bush |
(b)
(i)
Classes of food
1. Carbohydrates
2. Proteins
3. Fats and oils
4. Vitamins
5. Mineral salts
6. Water
(ii)
Starch → Carbohydrate
Milk → Protein
Margarine → Fat and oil
Sugar → Carbohydrate
(c)
(i)
calcium hydroxide → Ca(OH)2
(ii)
zinc chloride [zinc (II) chloride] → ZnCl2
(iii)
sodium nitrate [sodium trioxonitrate (V)] → NaNO3
(iv)
calcium carbonate [calcium trioxocarbonate (IV)] → CaCO3
(v)
potassium sulphate [potassium tetraoxosulphate (VI)] → K2SO4
(d)
(i)
Viscosity is defined as the internal force that opposes the movement of liquid molecules.
(ii)
An experiment to compare the viscosities of two liquids A and B
1. Liquid A and B are both poured into two separate identical measuring cylinders to the same level
2. Two identical metal balls are dropped into each of the measuring cylinders and the time taken for each ball to reach the bottom/base of the cylinders of liquids A and B are recorded
3. The liquid in which the metal ball took a longer time to reach the base/bottom of the measuring cylinder is more viscous
2.
(a)
(i)
State the difference between an opaque object and a translucent object
(ii)
Give one example each of an opaque and a translucent material.
(b)
(i)
What is the importance of seed dispersal?
(ii)
Name two types of fruits and state their mode of dispersal.
(c)
(i)
What is recycling?
(ii)
Give two advantages of recycling of materials.
(iii)
List three recycled products in Ghana.
(a)
(i)
Differences between an opaque object and a translucent object
| Opaque object | Translucent object |
| Does not allow light to pass through it | Allows some amount of the incident light to pass through it but one cannot see through it |
| Reflects or absorbs all the incident light without transmitting any | Partly absorbs and reflects some of the incident light and transmits the rest |
(ii)
Examples of opaque objects
1. Mirror
2. Wood
3. Metal
4. Wall
5. Human body
Examples of translucent objects
1. Frosted glass
2. Cloth
3. Water
4. Patchment
5. Oil
6. Kerosene spot on paper
7. Lamp shade/cloth/paper
(b)
(i)
Importance of seed dispersal
1. It prevents overcrowding of plants/prevents competition among plants for food and sunlight
2. It introduces/spreads plants to new areas
3. It minimizes the spreading of diseases among plants
(ii)
Types of fruits and their mode of dispersal
| Fruit | Mode of dispersal |
| Mango | Man/animal |
| Silk cotton | Wind |
| Coconut | Water |
| Flamboyant/beans/okro/legume | Man/animal |
| Crotalaria/pride of Barbados | Explosive/self |
(c)
(i)
Recycling is the production of new products from used/waste materials
OR
Recycling is the conversion of waste materials into useful products.
(ii)
Advantages of recycling of materials
1. It reduces waste in the environment/helps to control pollution
2. It conserves resources
3. It helps to generate income/employment
4. It helps in generation/conversion of energy
(iii)
Recycled products in Ghana
1. Polythene bags
2. Slippers
3. Paper
4. Tissue paper
5. Particle boards
6. Cooking pots
7. Iron rods
8. Rubbers
9. Biogas
3.
a)
What is an electrostatic force?
b)
i)
State the unit of
α)
force
β)
work
ii)
A body of mass 80 kg is lifted vertically through a distance of 5.0 m.
Calculate the work done on the body.
[g = 10 ms-2]
c)
Describe briefly how a mixture of common salt and powdered sulphur could be separated.
d)
State three characteristics each of
i)
an insect pollinated flower
ii)
a wind pollinated flower
a)
An electrostatic force is the force that exists between electric charges that are stationary on charged bodies.
b)
i)
α)
The unit of force is newton (N)
β)
The unit of work is joule/joules(J)
ii)
Work done = Force x Distance
Force = Mass x Acceleration due to gravity (g)
Mass = 80 kg
g = 10 ms-2
Force = 80 kg x 10 ms-2 = 800 N
Distance = 5 m
Work done = 800 N x 5 m = 4000 J
c)
How a mixture of common salt and powdered sulphur could be separated
1. Add water to the mixture and stir to dissolve the salt
2. Filter the resulting mixture
3. Sulphur is left on the filter paper and is dried
4. Heat the salt solution in an evaporating dish to obtain the salt
d)
i)
Characteristics of an insect pollinated flower
1. Petals are large
2. Petals are brightly coloured
3. The flower is usually scented
4. The flower has nectar
5. Stigma is inside the flower
6. Stigma is compact and sticky
7. Pollen grains produced per anther are few
8. Pollen grains are sticky, large, rough and heavy
9. Filaments are short and stout
ii)
Characteristics of a wind pollinated flower
1. Have less brightly coloured petals/petals are dull in colour
2. Petals are small in sizes and not easily seen or absent
3. The flower lacks nectar
4. The flower is not scented
5. Large amount of pollen grains are produced per anther
6. Have feathery/hairy stigma
7. Stigma hangs down to be able to catch pollen grains floating in the air
8. Pollen grains are small, light or dry and smooth
9. Filaments are long and flexible
4.
(a)
Define the following terms and give an example each
(i)
Herbivore
(ii)
Carnivore
(iii)
Omnivore
(b)
Two dry cells connected in parallel are in turn connected in series with a bulb and switch.
Draw a circuit diagram to illustrate this arrangement.
(c)
List four garden tools
(d)
What property of water causes mosquito larvae to float on it?
(e)
Describe an experiment you prepared to show that some part of air is used in burning.
(a)
(i)
Herbivore is an animal that feeds on plants only
Examples: Goat, rabbit, sheep, deer, cow, elephant, giraffe, horse
(ii)
Carnivore is an animal that feeds on the flesh of other animals only
Examples: Lion, wolf, leopard, hyena, polar bear, cat, cheetah, giant panda, felidae, tiger, sharks, venus fly trap
(iii)
Omnivore is an animal that feeds on both plants and animals
Examples: Man, bears, birds, dog, raccoons, fox, certain insects
(b)
(c)
List of garden tools
1. Cutlass
2. Hoe
3. Rake
4. Axe
5. A pair of secateurs
6. Garden fork/digging fork/foot fork
7. Spade
8. Hand trowel
9. Hand fork
10. Watering can
11. Garden shears
(d)
Surface tension
(e)
An experiment to show that some part of air is used in burning
1. Two candles are lighted simultaneously
2. Glass jar is mounted on one of the candles
3. It is observed that after a while, the candle under the inverted glass jar went off because it was no longer supplied with air whiles the other candle without the inverted glass jar kept on burning
4. It can be concluded that some part of air is used in burning
5.
(a)
The diagrams below are illustrations of a set-up used to study the conditions for seed germination. The flasks are kept at 25 oC during the experiment. Study the diagrams carefully and answer the questions that follow.
(i)
What conclusion can be drawn from the results of flask 1 and flask 2?
(ii)
What conclusion can be drawn from the results of flask 2 and flask 3?
(iii)
The seedings in flask 2 died after two weeks. What can be the reasons for this occurrence?
(iv)
A candidate concluded that light was an important factor for the germination. Did the candidate make a correct conclusion?
(v)
Give a reason for the answer stated in (iv) and state which of the flasks in the experiment could be used to support your answer.
(b)
The diagram below are illustrations of an experimental set-up. Study the diagrams carefully and answer the questions that follow.
(i)
Name the measuring instrument that is in:
(α)
parallel;
(β)
series;
With the resistor R
(ii)
What quantity does each of the named instruments in (i) measure?
(iii)
Read and record the values as indicated on:
(α)
A in amperes;
(β)
V in volts.
(iv)
Use the values read in (iii) to calculate the value of R.
(v)
State one precaution to be taken in performing this experiment.
(c)
The diagrams below are illustrations of soil.Study the illustrations carefully and answer the questions that follow.
(i)
Identify each of the soil types labelled A, B and C
(ii)
Describe each of the soils under the following properties:
(α)
Particle size
(β)
Air space
(iii)
State two ways of improving soil type B for vegetable cultivation.
(d)
The diagrams below is a set-up for preparation of common salt in the laboratory. Study the diagrams carefully and answer the questions that follow.
(i)
Name each of the parts labelled IV, V and VI.
(ii)
Name two possible solutions that can react to product salt.
(iii)
Name the process that takes place when the two solution named in (ii) react.
(iv)
Name the process that takes place in the set-up B.
(v)
Write a balanced chemical equation for the reaction between the two solutions named in (ii).
(a)
(i)
Light is not necessary for germination
(ii)
Water is necessary for germination
(iii)
1. Lack of water/moisture
2. The food stored in the seed is used up/the seedlings cannot carry out photosynthesis/no sunlight
(iv)
No, light is not an important factor for germination
(v)
1. Because light is not necessary for the germination of seed.
2. The seed in flask 2 germinated even though the flask was lined with the aluminium foil
(b)
(i)
(α)
Voltmeter
(β)
Ammeter
(ii)
Voltmeter measures the potential difference/voltage and ammeter measures the current (electric)
(iii)
(α)
5 A
(β)
10 V
(iv)
Resistance = Voltage/Current = 10/5 = 2 Ω
(v)
Precautions
1. Voltmeter and ammeter must be of proper range/calibration
2. The key should be inserted only while taking readings
3. All the electrical connections must be tight
(c)
(i)
A = loamy soil/loam
B = sandy soil/sand
C = clayey soil/clay
(ii)
Description of soils
| Soil Type | Particle Size | Air space |
| A | Medium/large | Moderate |
| B | Large/medium | Large |
| C | Small | Small |
(iii)
Ways of improving sandy soil
1. Mulching the soil
2. Applying organic manure/compost/farm yard manure/fertilizer
3. Planting cover crops
(d)
(i)
IV = Evaporating dish
V = Retort/clamp stand
VI = Tripod stand
(ii)
Sodium hydroxide (NaOH) and hydrochloric acid (HCl)
(iii)
Neutralization
(iv)
Evaporation/boiling/heating
(v)
NaOH + HCl → NaCl + H20
6.
(a)
In an experiment, as in the set-up above, two glass containers A and B of different sizes are joined together with a tube and clipped.
Water is poured into container A to a height of 30 cm and a red liquid is poured into B to a height of 10 cm. The clip is then removed so that the liquids join together.
(i)
State two observations that will be made immediately the clip is removed.
(ii)
Explain the observations in (i).
(iii)
What two observations will be made after a long time? Explain.
(b)
The set-up below is used in the preparation of ammonia gas in the laboratory
Study it and answer the questions that follow.
(i)
Name the parts labelled a, b and c
(ii)
What is the meaning of the arrow sign d?
(iii)
What is the function of the calcium oxide?
(iv)
Why has c been tilted downwards?
(v)
State the method by which the gas is collected.
(vi)
How will you test for the gas?
(vii)
Give the names and the chemical formulae of the compounds that form the content of c.
(c)
In an experiment, a leaf that is partly green and partly yellow is plucked from a tree and the leaf is
I boiled for a minute,
II dipped in warm alcohol,
III washed in cold water,
IV dipped in iodine solution.
One part of the leaf turns blue-black after the dipping in iodine solution while the other part remains unchanged.
(i)
Explain why each of the processes I, II and III
(ii)
Which part of the leaf turns blue-black? Explain.
(iii)
Why does the other part of the leaf not change colour?
(iv)
What conclusion can you draw from the experiment?
(a)
(i)
1. The level of water decreases and the level of the red liquid rises
2. Red liquid moves/diffuses into the water
(ii)
1. Water is at a higher potential/level/pressure so it moves in the direction of lower potential/level/pressure
2. Molecules of red liquid at a higher concentration moves towards region of lower concentration/molecules of red liquid diffuse into the water
(iii)
1. The level of the liquids will be the same/motion of the liquids stop (greater than 10 cm but lower than 30 cm) because the same pressure will be exerted by the liquids in A and B
2. The colour of the liquid in A and B will be uniform/same (pale/light red) because the concentration will be the same
(b)
(i)
a → ammonia gas
b → gas jar
c → round bottomed flask
(ii)
The meaning of the arrow sign d is heating
(iii)
The calcium oxide dries the gas produced
(iv)
c is tilted downwards to prevent condensed water from falling back into the hot flask/to cause cracking
(v)
Upward delivery/downward displacement of air
(vi)
Test for the ammonia gas
Damp/moist red litmus paper turns blue in the presence of the (ammonia) gas
OR
Gas produces fumes with HCl vapour/concentrated hydrochloric acid
OR
Gas has pungent/choky/urinal smell
(vii)
1. Calcium hydroxide (Ca(OH)2)/Sodium hydroxide (NaOH)
2. Ammonium chloride/Ammonium salt (NH4Cl)
(c)
(i)
I → to kill cells/stop photosynthetic process
II → to remove green pigment/decolourized
III → to wash off the alcohol/to soften the leaf
(ii)
The green part turns blue-black because photosynthesis took place in the green part to produce starch
(iii)
The other (yellow) part of the leaf not change colour because it does not contain chlorophyll/green pigment which will trap sunlight for photosynthesis to occur
(iv)
Presence of chlorophyll/green pigment in leaf is required/necessary for photosynthesis/production of starch to take place/occur