Kuulchat - BECE SCIENCE 2021

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OBJECTIVE TEST

Which of the following substances is a compound?

Oxygen

Magnesium

Water

Sodium

An atom of an element has a neutral charge because the

Protons and electrons are the same particles.

Proton number and electron number are the same.

Neutron number and proton number are equal.

Electron number and neutron number are equal.

Which of the following organisms is an ecto-parasite of animals?

Fleas

Tapeworm

Liver fluke

Roundworm

An atom has 20 nucleons and 9 protons. What is its neutron number?

Which of the following statements about aerobic and anaerobic respiration is not correct?

Water is produced as a by-product in anaerobic respiration.

Alcohol or lactic acid is produced in anaerobic respiration.

No oxygen is required in anaerobic respiration

Very little energy is released in anaerobic respiration.

An aluminium cube of side 2 m has a mass 24 kg. Determine the density of the aluminium.

3 kg m^-3

12 kg m^-3

24 kg m^-3

48 kg m^-3

An example of the process of osmosis is

Selective reabsorption

Absorption of digested food

The spread of petrol scent

Gaseous exchange in living things

What is the systematic name of the compound CO?

Carbon (I) oxide

Carbon (II) oxide

Carbon dioxide

Carbon (IV) oxide

Which of the following methods can be used to prevent iron from rusting?

I. Painting
II. Alloying
III. Keeping the iron in a desiccator
IV. Keeping iron in a moist environment

I and II only

II and IV only

I, II and III only

II, III and IV only

10.

The proper way of maintaining soil structure and fertility is termed as soil

conservation

depletion

profile

erosion

11.

The instrument that can be used to measure accurately the mass of a substance is

bean balance.

spring balance.

eureka can.

measuring cylinder.

12.

Which of the following chemical symbols can be used to remove permanent hardness of water?

NaHCO₃

Na₂CO₃

Ca(HCO₃)₂

CaCO₃

13.

Which of the following chemical symbols is that of an element with seven electrons in the outermost shell?

₂₀Ca

₁₇Cl

₁₀Ne

₁₆S

14.

Which of the following statements about the base of a transistor are correct? The base is

I. made very thin
II. made very wide
III. responsible for activating the transistor
IV. made of n-type semiconductor

I and III only

II and IV only

I, III and IV only

II, III and IV only

15.

Which of the following instruments is connected in parallel across a resistor in an electrical circuit?

Ammeter

Voltmeter

Ohmmeter

Galvanometer

16.

Which of the following fruits is dispersed by water?

Coconut

Mango

Maize

Cocoa

17.

A farming system which involves the growing of rice and the rearing of fowls is known as

crop rotation.

mixed farming.

mixed cropping.

organic farming.

18.

Which of the following activities are cultural practices in vegetable production?

I. Application of fertilizer
II. Harvesting
III. Mulching

I and II only

I and III only

II and III only

I, II and III

19.

The function of the white blood cells in humans is to

produce haemoglobin.

ensure blood clot during an injury.

produce antibodies to engulf disease-causing organisms.

produce digestive enzymes.

20.

Mosquito pupa breathes through tubes called

trachea.

siphon.

lungs.

gills.

21.

An advantage of practicing organic farming is that it

increases soil fertility.

reduces pest infestation.

reduces toxicity levels in plants.

increases resistance to plant disease.

22.

Which of the following planets is at the center of the solar system?

Earth

Venus

Mars

Sun

23.

Determine the potential energy of a block of mass 2 kg placed on a building 10 m tall. [g = 10 ms^-2]

20 J

50 J

100 J

200 J

24.

Which of the following organisms attacks crops in storage?

Crickets

Grasshoppers

Millipedes

Weevils

25.

One of the properties of acids is that they

turn wet blue litmus paper red.

have no effect on blue litmus paper.

turn wet red litmus paper blue.

are neutral to litmus paper.

26.

The instrument used to measure potential difference across a resistor is

ammeter.

barometer.

hydrometer.

voltmeter.

27.

A machine lifts a load of 100 N through a vertical distance of 2 m in 10s.

What is the work done by the machine?

50 J

100 J

200 J

400 J

28.

A machine lifts a load of 100 N through a vertical distance of 2 m in 10s.

What is the power of the machine?

50 W

20 W

10 W

2 W

29.

Which of the following elements is a macro-nutrient of plants?

Copper

Manganese

Molybdenum

Sulphur

30.

When an atom loses an electron, the ion formed is called

an anion.

a cation.

a molecule.

a compound.

31.

Which of the following chemical equations is balanced?

H₂ + Cl₂ → HCl

K₂O → K + O₂

Mg + O₂ → MgO

2Na + Cl₂ → 2NaCl

32.

Purple colouration of leaves of plant is a major symptom of deficiency in

Calcium

Nitrogen

Potassium

Phosphorus

33.

Which of the following diseases is not a deficiency diseases?

Scurvy

Cholera

Beriberi

Goiter

34.

In an experiment to determine the various particle sizes of soil sedimentation, the particle above clay suspension are

Loam

Organic

Gravels

Silt

35.

A person urinates more often in the rainy season than in the dry season because

more sweat evaporates from the skin.

less sweat evaporates from the skin.

his kidney works faster

he drinks less water.

36.

Heat from the sun by

I. Conduction
II. Convention
III. Radiation

I only

II only

III only

I, II and III

37.

Which of the following machines are complex machines?

I. Tractor
II. Mist blower
III. Sewing machine

I and II only

I and III only

II and III only

I, II and III

38.

Calcium oxide and water reacts to form calcium hydroxide. The formula for the product is

Ca₂OH

Ca(OH)₂

CaH₂O

Ca(H₂O)₂

39.

The current flowing through a resistor of resistance 10 ohms is 2.5 A. What is the potential difference between the two terminals of the resistor?

12.5 V

25 V

50 V

40.

If a soil is smooth and sticky, it means that the soil has a large amount of

Clay

Loam

Sand

Silt

THEORY QUESTIONS

(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).

Show Solution

(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

(a)

(i)

State what happens when photosynthesis occurs in a leaf.

(ii)

What is pollination?

(b)

Explain briefly why the mass of lumpy charcoal remains unchanged when ground into powder but the mass of the same lump changes when heated to burn.

(c)

(i)

What is a physical quantity?

(ii)

State two physical quantities

(d)

(i)

State two importance each of:

(i)

light;

(ii)

temperature;

In crop production

Show Solution

(a)

(i)

What is hardness of water?

(ii)

Give one example each of a natural source of water that is:

(α)

hard water;

(β)

soft water;

(b)

What is the end-product of the digestion of each of the following?

(i)

Meat;

(ii)

Cassava;

(iii)

Palm-oil;

(c)

Give one effect of each of the following factors considered in vegetable crop production:

(i)

soil type;

(ii)

nearness to market;

(iii)

nearness to source of water;

(d)

(i)

Explain briefly why an eclipse occurs.

(ii)

Name the two types of eclipse

Show Solution

(a)

(i)

Is the case with which water can lather with soap or the amount of dissolved Ca/Mg/Fe(II) ion in water.

(ii)

Natural sources of hard and soft water

(α)

Hard water

1. Sea water
2. Occean
3. Lagoon water
4. Well water
5. Ground water
6. Canal water

(β)

Soft water

1. River
2. Pond
3. Rain
4. Snow
5. Dew
6. Lake

(b)

End-product of the digestion

(i)

Meat (Protein) = Amino acids

(ii)

Cassava (Carbohydrate) = Glucose

(iii)

Palm-oil (Fat & Oil) = Faty acids/glycerol

(c)

Effect of factors considered in vegetable crop production

(i)

Soil type

1. Helps the farmer to know what type of vegetable to grow
2. To enhance yield of crops
3. To ensure adequate retention of water
4. To ensure adequate growth of crops

(ii)

Nearness to market

1. To avoid rotting of crop through long distance travels
2. For easy sale of vegetable crops
3. For easy purchase of farm inputs

(iii)

Nearness to source

1. For easy irrigation (supply of water to the crops)
2. To dilute pesticides for spraying
3. To process crops through washing
4. To apply fertilizer in solution to crops

(d)

(i)

Why an eclipse occurs

The earth, along with the other planets, revolves around the sun in its orbit. In turn, the moon revolves around the earth in the moon's orbit. There comes a time when the three heavenly bodies get aligned in the same straight line. This is when an eclipse occurs. It is defined as an astronomical phenomenon that occurs when one spatial object comes within the shadow of another spatial object. This obstructs the observer from seeing one of them in space.

Thus eclipse occurs when light from the sun is blocked by an opaque object to produce a shadow

(ii)

Types of eclipse

1. Solar or eclipse of the sun
2. Lunar or eclipse of the moon

(a)

(i)

Explain the term convection as applied to heat transfer.

(ii)

Give two reasons why convection does not occur in solids

(b)

Give two effects of each of the following soil physical properties on maize cultivation:

(i)

texture;

(ii)

water holding capacity

(c)

Use any three of the following organisms to construct a food chain:

Hawk, grasshopper, man, grass, toad, grasscutter.

(d)

(i)

Consider the following elements and state which element(s) is/are metals:

₁₁Na,₇N,₆C, ₃Li

(ii)

Explain briefly what is observed when pieces of each of the following metals are dropped into two separate test tubes each containing dilute hydrochloric acid:

magnesium;

silver.

Show Solution

(a)

State two important components each of the soils that helps:

(i)

Crops to grow well;

(ii)

To maintain good soil structure.

(b)

(i)

Explain how energy in a windmill is obtained

(ii)

State one source of renewable energy.

(c)

(i)

Explain why steel is preferred to iron in building construction.

(ii)

State two ways of preventing rusting.

(d)

State three ways of preventing indigestion.

Show Solution

(a)

State three ways by which the atmosphere in an industrial area is polluted.

(b)

(i)

Write the word equation for each of the following reactions between:

(α)

calcium and oxygen

(β)

nitrogen and hydrogen

(ii)

State the hazard that could be prevented when each of the following protective materials are used in the laboratory:

(α)

gas mask

(β)

goggles

(c)

If a cupoid of weight 100 N, has sides 5 cm by 10 cm, calculate the:

(i)

Area of the cuboid;

(ii)

Pressure exerted by the cuboid when it lies on its side.

(d)

(i)

Explain the term mixed farming.

(ii)

State two advantages of mixed farming.

Show Solution

(a)

Ways by which the atmosphere in an industrial area is polluted

1. Release of carbon dioxide from engines
2. Release of carbon monoxide from engines
3. Release of smoke into the atmosphere
4. Emission of radiations
5. Emission of heat
6. Release of dust from factories
7. Release of poisonous/acidic gases/nitrogen oxide/hydrogen sulphide
8. Release of exhaust fumes from vehicles or engines

(b)

(i)

Reactions between:

(α)

Calcium and oxygen

Calcium + Oxygen → Calcium oxide

(β)

Nitrogen and hydrogen

Nitrogen + Hydrogen → Ammonia

(ii)

Hazard that could be prevented when protective materials are used in the laboratory

(α)

Gas mask

Inhaling of toxic or poisonous gas

(β)

Goggles

Injury to the eye

(c)

Weight (Force) = 100 N
Breadth = 5 cm
Length = 10 cm

(i)

Area of a cuboid = Length x Breadth

Area = 5 cm x 10 cm = 50 cm²

(ii)

Pressure = Force / Area

Pressure = 100 N/50 cm² = 2 Ncm^-2

(d)

(i)

Mixed farming is the growing of crops as well as livestock, animal husbandry,etc all on same farm or land at the same time.

(ii)

Advantages of mixed farming

1. Animal droppings are used as manure for cultivating crops
2. Crops residue is used to feed the animals
3. Land is effectively used
4. Labour is effectively used throughout the year
5. Animals may provide power on the farm
6. Reduces risk of losing everything when diseases strikes or bad weather
7. Brings reliable sources of income
8. Reduces dependency on external inputs and costs
9. It enhances the productivity of the farmland

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Aerobic Respiration	Anaerobic Respiration
Oxygen is present when this form of respiration takes place	Oxygen is absent when this form of respiration takes place
Gases are exchanged in this form of respiration	Gases are not exchanged in this form of respiration
It can be found in the cytoplasm and the mitochondria	It can be found only in the cytoplasm
Glucose breaks down into carbon dioxide and water	Glucose breaks down into ethyl alcohol, carbon dioxide and energy
All higher organisms such as mammals have this type of respiration	Lower organisms such as bacteria and yeast use this type. In other organisms, it occurs during heavy activities
Releases more energy	Releases less energy

Macro-nutrients	Micro-nutrients
1. Carbon (C) 2. Hydrogen (H) 3. Oxygen (O) 4. Nitrogen (N) 5. Phosphorus (P) 6. Potassium (K) 7. Calcium (Ca) 8. Sulfur/Sulphur (S) 9. Magnesium (Mg)	1. Iron (Fe) 2. Boron (B) 3. Chlorine (Cl) 4. Manganese (Mn) 5. Zinc (Zn) 6. Copper (Cu) 7. Molybdenum (Mo) 8. Nickel (Ni)

Nutrient	Disease
Vitamin A (Retinol)	Night blindness
Vitamin B1 (Thiamine)	Beri-beri
Vitamin B2 (Riboflavin)	Retarded growth, bad skin
Vitamin B12 (Cyanocobalamin)	Anaemia
Vitamin C (Ascorbic acid)	Scurvy
Vitamin D (Calciferol)	Rickets
Vitamin K (Phylloquinone)	Excessive bleeding due to injury
Calcium	Brittle bones, excessive bleeding
Phosphorus	Bad teeth and bones
Iron	Anaemia
Iodine	Goitre, enlarged thyroid gland
Copper	Low appetite, retarded growth

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OBJECTIVE TEST

THEORY QUESTIONS

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