WAEC 2012 CHEMISTRY, PHYSICS, BIOLOGY and AGRIC REAL PRACTICAL QUESTIONS and ANSWERS

[megax]

2012 WAEC PRACTICAL PHYSICS
 SUMMARY GIVEN TO TEACHERS
Question 1
Retort stand with clamp;
spring balance;
two beakers, 500cm each
(A) containing water and labelled water;
(B) containing kerosene and labelled liquid L;
set of masses 50g, 100g, 150g, 200g and 250g;
thread about 1 m

Question 2
Retort stand with clamp;
flat bottom plastic petri-dish;
syringe about(0-10cm). Remove the needle. Pull up the plunger. Use flame from a match stick to melt and seal the tip of the syringe to ensure that it is air tight;
use appropriate (plastic to plastic) adhesive to fix the bottom of the petri-dish symmetrically to the top of the plunger;
set of masses 500g, 1000g, 1500g, 2000g and 2500g.
NOTE : masses may be improvised with fine dry sand.
Question 3
Potentiometer (0 - 100cm);
ammeter (0 - 3A);
voltmeter (0 - 5V);
jockey;
2 ohms standard resistor labelled R;
two dry cells each 1.5V or 2V freshly charged accumulator;
plug key;
eight connecting wires.

[megax]

2012 PRACTICAL BIOLOGY SPECIMENS

Specimen A - Garden egg fruit
Specimen B - Tridax fruit
Specimen C - Grain weevil
Specimen D - Tick
Specimen E - Rat (wet preserved)
Specimen F - Atlas Vertebra
Specimen G - Axis Vertebra
Specimen H - Cervical Vertebra
Specimen J - Tilapia fish (wet preserved)
Specimen K - Toad (wet preserved)
Specimen L - Lizard (wet preserved)

[megax]

2012 PRACTICAL AGRIC SPECIMEN
Specimen A - Organic manure
                  B - Inorganic manure
                  C - Sandy soil
                  D - Clay soil
                  E - Crucible
                  F - Source of heat/ Burnsen burner
                  G - Weighing balance
                  H - Cutlass
                  I - Hoe
                  J - Shears
                  K - Rake
                  L - Watering can
                  M - Shovel
                  N - Groundnut
                  O - Maize seeds
                  P - Guinea corn seeds
                  Q - Aphids
                  R - Lantern/Hurricane lamp
                  S - Chicken egg
                  T - Tick
                  U - A chart showing a pig/Hand drawn diagram of a pig.

[megax]

2012 WAEC Chemistry Number Questions 3 ;

Explain Briefly the Observations in each of the following Processes:
(i). When carbon (IV) oxide is bubbled through lime water, it turns milky but the milkiness disappears when the gas is bubbled for a long time.
(ii) A precipitate of calcium hydroxide is insoluble in excess sodium hydroxide solution whereas that of lead (II) Hydroxide is soluble.

(B)i) What is a primary standard solution?
(ii) Calculate the mass of sodium trioxocarbonate (IV) required to prepare 250cm3 of 0.15mol/dm3 solution. (Na = 23.0; O = 16.0; C = 12.0)

(C) Name one gas that can be collected by;
(i) Upward Displacement of Air.
(ii) Downwards Displacement of Air.

[megax]

Sandy soil, as its description suggests, has a relatively large amount of sand in it.

Sand is grainy and is not very good at absorbing water, so the soil is light and drains well.

Clay has a much smaller particle size and is composed of the same substance as chalk. It absorbs water well and, therefore, means that the soil can be thicker and drain much less well.

This is a very basic explanation. As already mentioned; clay holds water (and so nutrients) much better than sand, though is prone to waterlogging, especially in winter, which is dangerous to plants.

Clay is much more susceptible to pans, though is generally considered to be a better soil type.

Pick out d differences and read up d type of plant that can be grown on the two soil.

[megax]

A crucible is a container that can withstand very high temperatures and is used for metal, glass, and pigment production as well as a number of modern laboratory processes.

While crucibles historically were usually made from clay,

[1] they can be made from any material that withstands temperatures high enough to melt or otherwise alter its contents. A Bunsen burner, named after Robert Bunsen, is a common piece of laboratory equipment that produces a single open gas flame, which is used for heating, sterilization, and combustion

Read up their uses.

[megax]

weighing balance is a measuring instrument for determining the weight or mass of an object.

A spring scale measures weight by the distance a spring deflects under its load.

 A balance compares the torque on the arm due to the sample weight to the torque on the arm due to a standard reference weight using a horizontal lever.

Balances are different from scales, in that a balance measures mass (or more specifically gravitational mass), where as a scale measures weight (or more specifically, either the tension or compression force of constraint provided by the scale).

Weighing scales are used in many industrial and commercial applications, and products from feathers to loaded tractor- trailers are sold by weight.

[New World]

2012 PRACTICAL PHYSICS Question

 1 Retort stand with clamp; spring balance; two beakers, 500cm each (A) containing water and labelled water; (B) containing kerosene and labelled liquid L; set of masses 50g, 100g, 150g, 200g and 250g; thread about 1 m Question 2 Retort stand with clamp; flat bottom plastic petri-dish; syringe about(0-10cm). Remove the needle. Pull up the plunger. Use flame from a match stick to melt and seal the tip of the syringe to ensure that it is air tight; use appropriate (plastic to plastic) adhesive to fix the bottom of the petri-dish symmetrically to the top of the plunger; set of masses 500g, 1000g, 1500g, 2000g and 2500g. NOTE : masses may be improvised with fine dry sand. Question 3 Potentiometer (0 - 100cm); ammeter (0 - 3A); voltmeter (0 - 5V); jockey; 2 ohms standard resistor labelled R; two dry cells each 1.5V or 2V freshly charged accumulator; plug key; eight connecting wires.

[megax]

BIOLOGY PRACTICAL SUMMARY
Specimen A- garden egg
features* epicarp is soft and flesh
* many seeds are present
* epicarp is edible
It is dispersed by animal
economic importance* used in control of blindness
* good for ulcer patients
* helps to control obesity
The type of placentation is by axile
The botanical name is solanum melonge
Specimen B- tridax fruit
The botanical name is procumbenis and the family is called calyx. It is a true fruit, it develops from a superior monocarpous ovary and have one one seed. www.xbrainsforum.tk The mode of dispersion is by wind becos it is light and small.
Specimen C- grain weevil
pylum- anthropoda
class- insecta
habitat- it lives in grains.
Economic importance* They cause losses to farmers
* Reduces grains to powder
* They bore holes in grains and eat them up.
Prevention and control measures* early harvesting *proper storage of produce *hand picking *spray of insecticides eg DDT
External features of weevilit is divided into 3;the head,thorax,and abdomen.
Specimen D- tick
class- arachnida
phylum- anthropoda
habitat-found on goats,sheep,dogs.
External featuresthe body is divided into 2;
the head
the abdomen.
Economic importance* they act as vectors of disease
* they cause great annoyance and irritation to host
* bites may become a source of secondary infection.
Control measuresby picking
use of insecticides
burning the grasses where the animal graze.
Differences btw weevil and tickweevil                              tick
antenna present             antenna absent
rostrum present              rostrum absent
bristles absent                 bristle present
similarities btw both of themboth have vectors
both have head,thorax and abdomen
both have jointed legs.
Specimen E- rat
phylum- chordata
class- mammalia
habitat- bush,dirty corner
External featuresthe body is covered with hairs
it has an external ear
the body is divided into head,neck,trunk and tail
Adaptationthe eyes are placed on either side of the head to allow wide range of vision.
the pear-shaped head,narrow body and short folded legs allow for easy movement.
Limbs end in claws for digging the burrow
the body is covered with hairs which aid temperature regulation
Specimen J- tilapia fish(bony fish)
phylum- chordata
sub phylum- vertebra
class- pisces
habitat- aquatic
Adaptations of fish to its environment
streamlined body: this allows for easy movement in water
gills: offers an efficient means of respiration in water
scales: they protects against injury,control movement of salt in and out of fish body.
Specimen k-toad
phylum- chordata
class- amphibia
habitat- live on both terristrial and aquatic habitat
External featuresThe body is divided into head and trunk
Adaptation of the toad for lifeOn land
presence of longer muscular hind limb for hopping
In water
web on the hind limb for swimming
oval streamlined shape for easy movement
absence of neck to reduce friction during swimming
Specimen L- agama lizard
phylum- chorama
class- reptinla
habitat- terrestrial
Adaptation of lizard to terrestial environmentlimbs are developed for movement on land
dry scaly skin to protect it from drying up
they have the ability to change color which helps them to escape from their enemies
egg have shells to protect the embryo from mechanical damage.
Compiled by MEGAX...... STAY TUNED.

[megax]

2012 CHEMISTRY ANALYSIS 1 TEST

1a)Small portn of sample C+NaOH+Heat.
b)Anoda portn of sample C+BaCl+dil.HCl.

2a)Small portn of spec.D+NaOHaq drop den in excess.
b)Small portn of sample D+NH3aq drop den in excess.

3a)Small portn of sample D+dil.HNO3 drop +AgNO3aq.
b)Soln formed above+NH3aq drop den in excees.


OBSERVATION
1a)A colourless gas with pungent smell dat turn moist litmus paper blue.
b)White ppt is formed which is insoluble in dil.HCL.

2a)Redish brown ppt is formed which is insoluble in excees NaOH.
b)Brown ppt which is insoluble in excees NH3.


3a)White ppt is formed.
b)White ppt dissolve to form a clear soln.



INFERENCE
1a)NH3g 4rm NH4+ salt.
b)SO4 raise to power 2- is comfirmed/ present.

2a)Fe^3+ is comfirmed. b)Fe^3+ is comfired. 3a)Cl^- is present.
b)Cl^- is present.

[megax]

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