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WASSCE July 2019 science

OBJECTIVE TEST

1.

Which of the following characteristics is associated with insert - pollination flowers?

A.

They do not secrete nectar

B.

The surface of the stigma are sticky

C.

Their flowers are inconspicuous

D.

Their stamens have long filament

2.

The following materials are conductors of electricity except

A.

blood

B.

copper

C.

mica

D.

water

3.

Acids react with many reactive metals to give off

A.

hydrogen gas

B.

oxygen gas

C.

ammonia gas

D.

carbon dioxide gas

4.

The commonest method for propagating crops in Ghana is by

A.

budding

B.

root cutting

C.

seeds

D.

stem cutting

5.

Which device is used to measure the population density of a plant species ?

A.

Pooter

B.

Quadrat

C.

Sweep net

D.

Wire mesh

6.

The part of the eye on which images on which images are formed is called ?

A.

aqueous humour.

B.

pupil.

C.

lense.

D.

retina.

7.

The arrangement of electrons in shells of an atom is called

A.

atomic structure

B.

periodic arrangement.

C.

electronic configuration

D.

electronic structure

8.

The type of soil erosion caused by water run-off exposed land on a gentle slope is referred to as

A.

gulley erosion.

B.

rilly erosion.

C.

sheet erosion.

D.

splash erosion.

9.

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

10.

In beta decay, the particle emitted is

A.

electron.

B.

neutron.

C.

helium nucleus.

D.

hydrogen atom.

11.

Introduction of travel element into a tretravalent element

I. is know as doping

II.form an n - type semi-conductor

III.form a p - type semi-conductor

Which of the statement above are correct?

A.

I and II only

B.

I and III only

C.

II and III only

D.

I,II and III

12.

Which of the following animals is warm blooded ?

A.

Agama Lizard

B.

Wall gecko

C.

Cockroach

D.

Mouse

13.

In testing for starch in green leaf, the leaf is boiled in ethanol so as to

A.

Kill the leaf cells.

B.

dissolve the chorophyll.

C.

enable iodine solution to penetrate the tissue

D.

stop all chemical reaction in the cells

14.

The following statement are examples of application of biotechnology in agriculture except

A.

crossing animals with desired characteristics

B.

improving upon colour and size of a flower

C.

introduction of foreign genes into livestock

D.

development of pest - resistance crops.

15.

Which of the following solvent could best be used to to remove ink stain in a dress

A.

Ethanol

B.

Kerosene

C.

Milk

D.

Petrol

16.

A different between an atom and an ion is that an atom

A.

is electrically charged whilst an ion is neutral

B.

has protons whilst an ion has no protons

C.

can move about in solution whilst ions cannot move in solution

D.

cannot conduct electricity whilst an ion conduct electricity

17.

The application of lime to solid is to

A.

improve the toxicity of dissolved copper.

B.

improve the soil structure.

C.

increase the availability of calcium ions.

D.

decrease the activities of soil living organism.

18.

Which of the following food chain is correct

A.

Grass frog ----> grasshopper ----->hawk

B.

Hawk ----> grass ----> grasshopper ---> frog

C.

Grass ----> grasshopper ----> frog ----> hawk

D.

Grasshopper ----> grass ----> frog ----> hawk

19.

which of the following traits in human is an example of continuous variation ?

A.

Gender

B.

Colour blindness

C.

Body mass

D.

Blood group

20.

Which of the following metals will release hydrogen from dilute acids?

A.

Ag

B.

Cu

C.

Hg

D.

Zn

21.

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

22.

A property of a material that makes it a good conductor of heat is its

A.

colour

B.

length

C.

nature

D.

volume

23.

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

24.

In flies, the allele for grey body colour is dominant and black body is recessive.Two grey-bodies flies mated and they produced 75 grey-bodies flies and 25 black-bodies flies. The cross described is most likely to be

A.

GG x GG

B.

GG x Gg

C.

Gg x GG

D.

Gg x Gg

25.

Which of the following features are associated with dairy cattle? They

I. are lean with fairly long legs.

II. have well - shaped body conformation.

III. have well - develop udder.

IV. are generally humped.

A.

I and II only

B.

II and III only

C.

I,II and III only

D.

II,III and IV only

26.

A girl of mass 60 kg runs a 100 m race in 10s.Use the information to answer questions 26 and 27

A.

110 ms -1

B.

100 ms -1

C.

50 ms -1

D.

10 ms -1

27.

A girl of mass 60 kg runs a 100 m race in 10s.Use the information to answer questions 26 and 27

Calculate the kinetic energy of the girl.

A.

6000J

B.

3000J

C.

170J

D.

40J

28.

The atomic number of an atomic number of an atom 15 and its mass number is 32.Determine the number of neutrons in the atom.

A.

15

B.

17

C.

32

D.

47

29.

The IUPAC names for Na2SO4 is

A.

sodium (II) sulphate.

B.

disodium sulphate.

C.

sodium tetraoxosulphate. (IV)

D.

sodium tetraoxosulphate. ( VI)

30.

Release of dust into the atmosphere

I. cuts down photosynthesis.

II. cause respiratory disease.

III. reduces visibility

Which of the following above is/are correct?

A.

I only

B.

I and II only

C.

I and III only

D.

I,II and III

31.

Dehorning is importance in animal production because it

A.

control endoparasites.

B.

makes it easy to handle animals.

C.

reduce the food intake of the animals.

D.

makes easy identification of animals.

32.

Which of the following physical properties are associated with sandy soil ?

I. It is well aerated.

II. It has a poor water holding capacity.

III. It is poorly drained.

A.

I only

B.

I and II only

C.

I and III only

D.

I, II and III

33.

What is the unit for momentum

A.

kg m3

B.

Kg m s-1

C.

kg m s -2

D.

m s-1

34.

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.

35.

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

37.

The concept of natural selection involves the following features expect

A.

survival of the fittest

B.

competition among organism

C.

organisms with the best adapted feature

D.

the use of the concept to classify

38.

Reflection of light occurs because light travels from medium to another

A.

in the same direction

B.

with the same intensity

C.

with different velocities

D.

obeying the laws of reflection

39.

Drug addiction is a brain disease because it

A.

is chronic and relapsing

B.

is harmful and result in compulsive drug use

C.

results in the structural change of the brain of the use

D.

makes the brain more sensitive to drugs

40.

A common disease that affect sheep is

A.

anthrax

B.

aspergillosis

C.

coccidiosis

D.

gumboro

41.

which of the following gases are major atmospheric pollutants

I. Nitrogen dioxide

II. Oxygen

III. Chlorofluorocation

A.

I and II

B.

I and III only

C.

II and III only

D.

I, II and III only

42.

Ethanol may be preferred to mercury as a thermometric liquid because

A.

ethanol is colourless

B.

mercury has a higher specific heat capacity

C.

mercury wet glass.

D.

ethanol has a far lower freezing point

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

44.

In which of the following blood vessel is the pressure highest

A.

Hepatic artery

B.

Renal artery

C.

Dorsal aorta

D.

Vena cava

45.

Yam is classified as a

A.

Cereal

B.

legume

C.

root tuber

D.

stem tuber

46.

The Easterlies are winds which blow.

A.

towards the pools

B.

from the poles to the equator

C.

along the equator

D.

into the sea

47.

An example of a saturated hydrocarbon is

A.

ethane.

B.

ethene.

C.

ethyne.

D.

ethanol.

48.

The structure in the human body which stores glycogen is

A.

ileum.

B.

liver.

C.

lungs.

D.

pancreas.

49.

The image formed by a plane mirror is

A.

magnified.

B.

real.

C.

laterally inverted.

D.

diminished.

50.

One advantage of mulching is that it.

A.

may be a source of new weed species.

B.

acidifies the soil.

C.

improves soil texture.

D.

increases soil temperature.

THEORY QUESTIONS

1.

(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.

Show Solution
2.

(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.

Show Solution
3.

(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).

Show Solution
4.

(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.

Show Solution
7.

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.

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