Students session

BECE INTEGRATED SCIENCE 2022 QUESTIONS AND ANSWERS B (Pasco)

Q1.

i) Identify each of the parts labelled I, II and III

ii) Name the method of separation in each of the set-up

α A;

β B.

iii) State the class of Mixture that the experimental set-up A could be used for

iv) Give a reason for the answer stated in (iii)

v) Name one possible component of the mixture in set-up B

Vi) State the function of the part labelled IV

Answers for question 1

(i)I-beaker ii-residue/particles/cotton wool/mixture/filter paper/filtrate III-filtrate

(ii)A-filtration

B- magnetization

(iii)-Solid-liquid mixture

-Liquid-solid mixture

(iv)Because there is residue on the filter paper and filtrate in the beaker

(v)-iron filings/ any magnetic substance

-powdered sulphur

-sand

-powdered charcoal

-any solid substance

(vi)Is to hold the funnel in place/holds the clamp

b.

2.  i) Name the System illustrated

ii) Name each of the parts labelled I, II, III and IV

iii)  What is the role of the part labelled I

iv) Name three diseases that affects the System illustrated

Answers

(i)Respiratory system

(ii)I-Larynx

II-Trachea

III-Bronchus

IV-Lung

(iii) -allows air to pass through through it

-prevent food and drink from blocking the airways

-produces sound/phonation

(iv)-pneumonia

-Tuberculosis

-Bronchitis

-Lung cancer

-Influenza

-Asthma

C.

(i) Identify the device above

Rain gauge

(ii) Label the parts I,II and III

I-funnel

II-measuring cylinder

III-rain water/water

(iii)State the functions of the parts I and II

I- directs rain water into measuring cylinder

II-use to measure the amount/volume of rain water/ collect rain water

(iv)  State the ecological factor the device is used to measure

Rainfall/ amount of rainfall/rain

(v)List three importance of the ecological factor mention in (iv) above

-an agent of weathering of rocks in the soil.

– dissolves plant nutrients for easy absorption

-causes erosion

-causes leaching

-needed for seed germination

(vi) Handfork /any tool that can be used to dig out soil

(vii)It is used to loosen hard soil surface after heavy rainfall

d.

1d i) Identify each of the components labelled I, II and III.
ii) State the Type of arrangement of resistors (R) in B
iii) State the effect of the arrangement of resistor in each of the diagrams A and B on III
iv) Give a reason for each of the answers stated in (iii)

2. a State three Differences between metals and non-metals in terms of their physical Properties.

b) i) Explain the term active region as applied to transistors
ii) State what happens in the active region of a transistor.
c) i ) state two effects of lack of protein in the diet of humans
ii) Describe the chemical test for glucose
d) i) What are soil resource?
ii) State two agricultural activities which make the soil lose its nutrients.

3. a) List in the correct order, the organs through which food passes from the mouth to the anus.
b) State the components of a balanced ration for feeding poultry.
c) Predict the products formed when
i) Magnesium solution reacts with dilute hydrochloric acid.
ii) potassium reacts with water
d) i) State two effects of heat on a substance.
ii) Potassium permanganate crystals are dropped into a beaker of water and warmed;
α) State what would be observed.
Β) State the Phenomenon demonstrated in (α)

Answers

(i)I- cell

II- switch/key

III- lamp/bulb

(ii) parallel

(iii) A-makes III/bulb dim

B-makes III/bulb bright

(iv)A- the resistors in series have an increased resistance

B- resistors in parallel have decrease resistance hence keeps the bulb bright.

 

Q2a.State three differences between metals and non-metals in terms of their physical properties.

Metals Non-Metals
Good conductor of heat Poor conductor of heat
Conducts electricity Poor conductor of electricity
Malleable Non-malleable
Ductile Brittle
Lustrous Dull

(b)(i) Explain the term active region as applied in a transistor

When a base-emitter junction is forward biased and base-collector junction is reverse biased.

(ii)State what happens in the active region of a transistor

Transistor behaves as an amplifier

C(i)Sate two effects of lack of protein in the diet of humans.

A.weakness/fatigue

B-stunted growth

C-marasmus

D-anaemia

E-kwashiorkor

(ii)Briefly describe the chemical test for glucose.

Fehling’s/Benedict’s solution is added to the test sample and heated until brick red/ reddish brown colouration indicates the presence of glucose.

(d)What are soil nutrients?

(i) Soil Resources are materials in the soil that support plant growth

(ii)State two agricultural activities which make the soil loose its nutrients

A-excessive drainage/runoff

B-over grazing

C-crop removal

D-irrigation leading to leaching

E-poor tillage practices

Q3.a.List the correct order, the organs through which food passes from the mouth to the anus.

Mouth to esophagus to stomach to small intestine to large intestine to anus

  1. State the components of a balanced ration for feeding poultry.

A-carbohydrates

B- protein

C-fats and oil

D-minerals

E-vitamins

F-Water

c.Predict the products formed when;

(i) magnesium solution reacts with dilute hydrochloric acid

Magnesium chloride and hydrogen/MgCl2 and H2

(ii)potassium reacts with water

Potassium hydroxide and hydrogen/KOH and H2

d.(i) State two effects of heat on a substance.

  1. change of state/melts/vapourizes
  2. expansion/contraction/change in shape
  3. increasing temperature / decreasing temperature

(ii)Potassium permanganate crystals are dropped into a beaker of water and warmed

a.State what would be observed

warm coloured water moves from the bottom of the beaker upwards.

  1. State the phenomenon demonstrated in (a)

Heat transfer by convection/ Diffusion

Q4.a(i)Name the stages in the life cycle of a mosquito

egg to larva to pupa to adult

(ii)Name the stage at which feeding does not take place

pupa

b.Explain the reason why air is described as a mixture.

Air contains different elements which are physically combined/ consist of different substances which can be separated by physical means.

c.What is the pole of a magnet

(i)The pole of a magnet is a point/ area on a magnet where the magnet force is greatest/ where all lines of force appear to come out from or appear to enter.

(ii) State three uses of a temporary magnet

a.electric bell

b.loudspeaker

c.telephone earpiece

  1. generators/ electric motor/dynamo

d State four reasons for planting crops in a row

(i)It improves drainage

(ii)it keeps plant roots evenly spaced.

(iii)machines can be used on the farm

(iv) easy to replace ungerminated seed

(v)allows free movement of air

Q5.a Name two elements which make the teeth of an animal strong

(i)A-Calcium B- phosphorus D-fluorine

(ii) Name two common diseases of human tooth

A- Dental caries/cavity/tooth decay

B-Gum disease/gingivitis/periodontal disease

c-Plague

  1. State three reasons why sandy soil cannot support effective plant growth

(i) easily eroded

(ii)heats up very easily/ can dry out

(iii)poor nutrient content/ less fertile

(iv)susceptible to leaching

(v)poor water retention

c.An atom has 13 protons and 14 neutrons

(i)Draw and label the structure of the atom

(ii)3

d.(i) State three ways in which fluid pressure can be applied

A- water pumps

B- Car brakes

C-syringes

D-siphon

E-enema

F-pumping tyre

(ii) State one substance that is an insulator

dry wood/air/glass/plastic/rubber/cloth

Q6. a.Explain the term mixed cropping

Mixed cropping is a system of farming where two or more crops are grown on the same piece of land at the same time/simultaneously.

b.(i) What is an alloy?

An alloy is a solid solution/ uniform mixture/substance of two or more metals/ a non-metal and a metal.

(ii) State the constituent metals in brass

Copper and Zinc

c.(i)State three effects of dumping waste int water bodies

a.decomposes to give water bad odour

  1. makes the water dirty/cloudy/pollutes water/unsafe for drinking

c.introduces germs/ diseases into the water

d.flooding

  1. reduction in oxygen level in the water

(ii) State one fuction each of the following in photosynthesis

  1. Chlorophyll- for absorption of sunlight/ converts CO2 and H2O into glucose.
  2. water- used to produce glucose/oxygen.

d.(i) What is work?

Work is the product of force and the distance moved in the direction of the force.

(ii) A block of wood of mass 10kg was dragged through a distance of 3.2m. Calculate the work done. Work done= Force*Distance

=20*32

=64 joules

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Alvin
Alvin
26 days ago

Good

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