₦airaland Forum

OGOJNR:
when a body of mass 500g is placed on a spiral spring,it extends by 0.2 m.find itz extension if a mass of 700g is placed on it(g=10m/s'2)...pls,solve

F=KE
5=K*0.2
K=25

F=KE
7=25*E
E=0.28

horpeyemmi66:
Hmmm, are all of you guys gunning for Medicine cos you are gonna make good Physicians.

Your scores were impressive, I must say.

Dealing with basic ***Cardiology*** like no man's business. Kudos!.

Here is what lets do, we are gonna go through 5 questions which proved confusing/tough...It was on my part, sorry I twisted somethings here and there.

Ok,

....MCQ 7
Regurgitation, option B. Those Valves are referred to as Semi lunar valves. Since blood flows through the Veins at low pressure, there is a proclivity for a flow back of blood but with the valves present no back flow of blood is ensured.

This can also be witnessed in the heart of a frog whose right and left chambers are not totally separated from each other, a tendency for the blood to mix is present but the presence of ridges and valves prevents the occurence.

.....MCQ 8
A confusing one, the sequence of blood clotting.
The correct sequence is
Exposure of Platelets to air→thromboplastin/thrombokinase→prothrombin→thrombin→fibrinogen→fibrin(Insoluble), Option B.

An enzyme thrombokinase/thromboplastin converts Prothrombin to thrombin(enzyme also).

The crucial role of the enzyme thrombokinase/thromboplastin is seen in people suffering from the sex-linked disease Haemophilia, the inability to clot blood.

Haemophilia in this context should not be mistaken for inadequate Fe or K in the blood.

......MCQ 9
True your answer @OGOJNR, open circulatory system is found in insects.

But it is also found in Molluscs. I could have easily written Molluscs in the options but I cleverly wrote Archatina saginata a species of Snails which is under the Phylum Molluscs alongside the squid and Octopus.

Archatina archatina is also a species of snail.

The open spaces in which the blood fluid of insects bath their organs is known as the Haemocoel.

THIS FACT IS NOT WRITTEN IN TEXT BOOKS MOST OF THE TIME: That Annelids (although the excretory system is related to blood), Nematodes and Platyhelminthes, have their organs bathed in Coelomic fluid.

The most suitable answer here is Archatina saginata, Option B.

.....MCQ 11

Option B, the Liver.
The liver receives double portion of blood from the heart, via two sources viz:
A. The hepatic artery: This runs directly from the heart
B. The hepatic portal vein: This comes from the gut(especially the small intestine; duodenum and Jejunum and a little from the ileum).
A portal vein is a vein which passes through a tissue or an organ before getting to its destination.

....MCQ 12
Option D, Translocation this is the mass movement of organic products in the vessels of a plant.

Guttation is similar to Transpiration, but there is a nuance. In transpiration water escapes as vapour and it occurs in almost every plant while Guttation occurs predominantly in Tomatoes and sweet Potaetoes where water escape as droplets on the surface of the leaves.
------------------------------------------------------

Thanks for the compliment @becborn, that was sweet of you.

Looking forward to Anatomy, Physiology and BioChemistry classes with you guys.


Yours, Opeyemi.

quite late to answer the questions...I must say that am always impressed with the way you post and answer questions here...Thank you

Looking forward to seeing you too

horpeyemmi66:
Finally you are whole again at Cassyrooy...

LET THE FRENZY BEGIN

*CHEMISTRY
1. Which of the following ways is not a way of producing an acid

A. Mixing of constituent elements

B. Using a strong acid to displace a weak acid or Volatile acid from its salt

C. Dissolving of acid anhydrides in water

D. Mixing two corrosive bases

2. Hydrogen and helium are employed to do what?

A. Scuba diving

B. As aerodrome beacons

C. To make colourful lights

D. To prevent the oxidation of lamp filaments

3. Acetic acid is used in

A. Making of salts

B. The dying of textiles and silk

C. Making of fruit juices

D. For making of Soft drinks

4. The kind of bonding present in H3O+ is

A. Covalent

B. Dative

C. Ionic

D. Hydrogen

5. Which of the following dissociates to produce three different kinds of ions in solution

A. Complex salt

B. Acid Salt

C. Basic salt

D. Normal salt

6. The dispersion of Liquid into a solid gives which of the following

A. Solid foam

B. Emulsion

C. Solid emulsion

D. Liquid aerosol

7. One distiction between true and colloidal solutions is that

A. Colloidal solutions are transparent

B. Colloids exhibit the tyndall effect

C. Colloids are agglomertion of atoms

D. Colloids are not totally false

8. Which of the following cause fluorescence in Zinc Sulphide and Sodium iodide

A. Beta particles

B. Gamma rays

C. X- rays

D. Alpha particles

9. The shape of a ammonia molecule is

A. Bent

B. Linear

C. Tetrahedral

D. Trigonal pyramidal

10. The basicity of ethanoic acid can be said to be

A. 4

B. 3

C. 2

D. 1

**********GOOD MORNING**********

I was a bit late.... seen the answers....GRACIAS

mikechibuzor:
4. Let the distance from his starting point be x.
So sin 30/5= sin 120/x
x=5sin 120/sin 30.
X= 8.7km.
5. Using pythagoras rule
x^2= 12^2 + 5^2
x=13km. Which is the displacement. The total distance travelled is the sum of the distance he travelled in both directions which is 17km (12 + 5).
So difference is equal to -4km.
6. D
7. B. Vectors have both magnitue and direction and every watchamacallit in option b does.
8. Impulse = momentum change.
Ft= mv - mu.
I believe the answer is 20kgm/s but using the formula gives something diff. Please kindly do extensive explanation here.
9. Is definitely A.
10. Tough but i think i'm tougher.. Hehe
, F= ma right? No owo e so ke to ba n doubt. No hands up seems i can go on.
2000= 800 x a
a= 2.5m/s/s.
After the force was applied, the car moved with 2.5m/s/s before it completely stopped.
The distance it took the car to finally stop should be
uhm.. V^2= u^2 + 2as
20 x 20 =0 + 5s
S = 80m.
Apparently, option B is the correct answer.
RIP to the dog.

I can't remember the last time i read but the way things are(your questions pushing me), i'm sure it won't be long for me to re-marry my books.
For the record,we're divorced.

For the impulse

Ft=mv-mu
after hitting the wall the ball rebounded and moved in the opposite direction
Ft=mv-(-mu) the - sign was introduced cos of the opposite direction

10+10= 20

horpeyemmi60 over to you

horpeyemmi66:
*PHYSICS
1. Two Submarines The knight and The cascade were submerged gradually into a river at a depth of 120m and 180m respectively below the water surface. If the atmospheric pressure is 15m of Water, find the ratio of the pressure of The Cascade to The knight.

2. A pilot records the atmospheric pressure outside his aircraft as 83cmHg while a ground observer has a reading of 94cmHg for the atmospheric pressure on the ground. If the density of the atmosphere is constant, calculate the height of the aircraft above the ground[Relative density of Mercury=15 and Air=0.0015]

3. If the normal atmospheric pressure in a chemistry Laboratory supports a column of Mercury 0.85m high and the relative density of Mercury is 18.5, then the height of the water column which the atmospheric pressure will support in the same Chemistry laboratory at the same time is?

4. A man walks 8km north and then 5km in a direction 60° east of north. Find the distance from his starting point.

5. A boy travels 12Km eastwards to a point B and then 5km southwards to another point C. Cakculate the difference between the magnitude of the displacement of the boy and the distance travelled by him.

6. The distance travelled by a particle starting from rest is plotted against the square of the time elapsed from the commencement of motion. The resultant graph is linear.
The slope of this graph is a measure of

A. Initial displacement

B. Initial velocity

C. Acceleration

D. Half the acceleration

7. Which of the following is a set of Vectors?

A. Force, mass and moment

B. Acceleration, velocity and moment

C. Mass, weight and density

D. Mass, Volume and density

8. A ball of mass 5.0kg hits a smooth vertical wall normally with a speed of 2m/s and rebounds with the same speed. Determine the impulse experienced by the wall.

A. 20.0kgm/s

B. 10.0kgm/s

C. 5.0kgm/s

D. 1.3kgm/s

9. Two particles X and Y starting from rest cover the same distance. The acceleration of X is twice that of Y, the ratio of the time taken by X to that taken by Y is?

A. 1/2

B. 2

C. 1/√2

D. √2

10. The driver in a motor car of which the total mass is 800kg and which is travelling at 20m/s, suddenly observes a stationary dog in his path 50m ahead. If the car brakes exert a force of 2000N, what will most likely happen?

A. The car will be able to stop immediately the driver notices the dog
B. The car will stop 30m after hitting the dog
C. The car will stop 20m in front of the dog
D. The driver will quickly reverse the car
E. The driver will have to find a banking angle to ensure traction.


cc Polymath, Pr0ton, Dr. Host, Dr. Sage, Mikechibuzor, thaotech, AleXis0r, francistony, MedwhiteO, Bhuumhite, Funkysilver etc


*******UNA GOOD MORNING*******

1.104000cm
2. 2:3
3. 15.75
4. 13KM
5. 4km
6. C
7. B
8. A
9. A
10. C



Good evening everyone!

horpeyemmi66:
@Horlarmancy, you see, you guys have to take things lightly...either of you should have probed to know who the man behind the Mask was. But you were blinded by seemingly irrelevant things like words...
-------------------------------------------------------

*BIOLOGY| NUTRITION 002

1. Which of the following converts Pepsinogen to pepsin?

A. Renin

B. HCl

C. Amylopsin

D. Insulin

2. Which of the following Animals has no gall bladder

A. Rattus rattus

B. Homo sapiens

C. Tilapia zilli

D. Bufo regularis

3. They Cardiac and Pyloric sphincters are found in what Organ?

A. Gall bladder

B. Pancreas

C. Spleen

D. Stomach

4. The Caecum and Appendix have become Vestigial organs in humans due to which of the following?

A. Size to mass ratio

B. Inability to digest Cellulose

C. Evolution

D. A and C

5. Zynogens are what?

A. Epithelial linings

B. Co-enzyme Activators

C. Co-enzyme inhibitors

D. Liquid poisons

6. Insulin and Glucagon are enzymes found in what Organ?

A. Stomach

B. Bladder

C. Pancreas

D. Spleen

7. The formation of Urea occurs where?

A. Bladder

B. Liver

C. Spleen

D. Kidney

8. Foetal red blood cells are produced where?

A. Liver

B. Bone marrow

C. Coronary arteries

D. Chorion

9. The Dental formula of a Dog is which?

A. I 2/2 C 3/4 Pm 4/4 M 3/2

B. I 3/3 C 1/1 Pm 4/4 M2/3

C. I 0/2 C0/1 Pm 4/4 M 2/3

D. I 0/3 C 0/1 Pm 3/3 M 3/3

10. The true stomach of a bird is otherwise known as what?

A. Proventriculus

B. Reticulum

C. Caecum

D. Gizzard.

Good Morning, and its a beautiful day, today in Nigeria.

Cc Mikechibuzor....Sir.Mike!,
AleXis0r.....U ehn!,
DrHost...U ehn!, jacking mode?
Bhuumhite...where art thou?,
thaotech....Dr. Sir,
Francistony...we have missed you mischief,
PrOton.................Baba Isale of Group,
Dr.Sage....Now two Dr.s,
Professorbea...what Course ma?,
Pes13....A man of 9lives,
Whales2020....now you've jilted NL?,
Estijaz.................missed you Sis,
Ogunsinamayowa....Laughter is the best Medicine,
Polymath....................FIGHTING!,
Cassyrooy....Dike!,
UMartins1 I don't like you,
Medwhite...you have an attitude,
Horlarmancy...Forget the fracas baba, he never knew...
FunkySilver....where art thou?, et al

1. B
2. C
3. D
4. B
5. B
6. C
7. D
8. B
9. B
10. A

Good afternoon and Happy Democracy Day!!!

P0lyMath:
@Horpeyemmi66, u tried for the other questions though u re more than it. But that No2 is a big NO.


@Thaotech, u tried wella bro but u need to be conscious of what a question wants(0.32N=320g)


That no2, really puzzled me before I could solve it.



FIGHTING

thank you. About the 320g to Newton

320g to kg divide by 1000 = 0.320kg

0.320kg to newtons multiply by 10= 3.2N

once again gracias bro.......constructive criticisms pls

P0lyMath:
1. A body of mass 10kg in equilibrium by two ropes. If one rope pull the body horizontally and the other at 40° with the vertical, calculate the tension in each ropes.

2. A stone is dropped from the top of 50m high tower. At the same time another stone is thrown upward from the foot of the tower with a velocity of 25m/s. At what distance from the top and after how much time the stones cross each other.

3. The uniform metre rule balances on a knife edge at the 55cm mark when a mass of 40g is hung from the 95cm mark. Find the weight of the ruler



FIGHTING

1. T1= 84.0
T2= 130.5



3. 3.2N

horpeyemmi66:
You had a whooping 80%...hmmm I fear you ooOO!, What course?

medicine and surgery BTW the no 9 question stated that the process by which protein is formed and your answer seems to be the series of process in which protein is broken down

horpeyemmi66:
*BIOLOGY | NUTRITION

1. The general molecular formula for Polysaccharides is

A. (C6H6O6)n

B. (C6H3O3)n

C. (C6H10O5)n

D. (C11H22O11)n

2. The confirmatory test result for the Osmic test is

A. Violet ppt

B. Black ppt

C. Brick-red ppt

D. Deep yellow ppt

3. In Carbohydrates, the ratio of Hydrogen to Oxygen is

A. 1:1

B. 3:4

C. 1:2

D. 2:1

4. The reaction: HCl+NaOH+Benedict's solution or HCl+Fehling's solution is used to test for what

A. Maltase

B. Sucrose

C. Glucose

D. Ribose

5. Which of the following Vitamins is otherwise known as Cyanocobalamin

A. Vit K

B. Vit B12

C. Vit B3

D. Vit E

6. Which of the following is correct according to this description: Straight Chain & Branched Chain

A. Starch and Glycogen

B. Cellulose and Starch

C. Glycogen and Cellulose

D. A and B

7. Which Vitamin is divided into these two origins: Plant and Animal(Phytomenadione and Menaquinone)

A. Vit E

B. Vit K

C. Vit C

E. Vit Bcomplex

8. The hydrolysis of Oligosaccharides and Polysaccharides are

A. Amino acids

B. Sucrases

C. Monosaccharides

D. Disaccharides

9. Proteins are formed in which of the following sequences

A. Protein→Pepsin→Proteases→ Peptones→Amino acids

B. Protein→Proteases→Peptones→ Polypeptides→Amino acids

C. Amino acids→Proteases→Protein →Polypeptides→Peptones

D. Polypeptides→Proteases→ Peptones→Amino acids

10. Compounds of fats without double bonds are said to be

A. Saturated

B. Unsaturated

C. Denatured

D. Supersaturated

cc DrHost, Mikechibuzor, thaotech, PrOton, Bhuumhite, FunkySilver et al

1. C
2. B
3. D
4. B
5. B
6. C
7. B
8. C
9. No answer
10. A ....waiting

horpeyemmi66:
hahahaha!....but you amazed me, you were so close, very very close; and I think that is very Laudable.

You will see how close you came before you can spell JACK ROBINSON...lols

I want to clarify something before delving any further,
for the general salt AaBb:
Ks ↔ [aA^b+]^a x [bB^a-]^b

Now to no 1....
PbI2↔ [Pb^2+] x [I^-1]
Ks↔ [Pb^2+] x [2I^-1]^2......(**)
Ks↔ [1.65 x 10^-5] x [2 x 1.65 x10^-5]^2
Ks↔ [1.65 x 10^-5] x [3.30 x 10^-5]^2
Ks↔ [1.65 x 10^-5] x [10.89 x 10^-10]
Ks= 17.96 x 10^-15
Ks= 1.796 x 10^-14

One might wonder where PrOton got the unit to his answer which is very correct, here is what he did:
Concentration is measured in Mol dm^-3 abi?

So putting Mol dm^3 in place of Pb and I2 in (**),
K= [mol dm^-3] x [mol dm^-3]^2
K= [mol dm^-3] x [mol^2 dm^-6]
K= mol^3 dm^-9

Therefore,
Ks= 1.796 x 10^-14 mol^3 dm^-9.

Cc PrOton, you didn't multiply your Iodine ion by 2

2. This is rather explicit needless to say
SrSo4↔ [Sr^2+] x [So4^2-]

If you follow the format of the general salt above AaBb, in this case nothing changes, ipso facto I mean you don't need to square or multiply any of them in the Brackets[].

So, Ks↔[Sr^2+] x [SO4^2-]
3.2 x 10^-8= [C] x [C]
C^2= 3.2 x 10^-7
C= √3.2 x 10^-7 mol^2 dm^-6
C= 1.79 x 10^-7 mol dm^-3

cc PrOton, your standard form notation was not same as above lolz.


Nevertheless, you guys have done well. Kudos to Mikechibuzor, thaotech, PrOton.

But PrOton,

"256y5= 3.2 x 10-7mol2dm-6
y5= 3.2 x 10-7/ 256
y = 5√1.25 x 10-9"....this is abracadabra take the 5th root of the unit and see what you get.

And that last fracas, you sef no be pikin again, let it go.

seen my mistake....gracias

horpeyemmi66:
*CHEMISTRY

1. Calculate the solubility product of lead iodide at 25 degree celcius, given that its solubility at this temperature equals 1.65 x 10^-5 mol/dm3

2.Given that the solubility product of strontium(II) tetraoxosulphate (VI) at 25 degree celcius equals 3.2 X 10^-7 mol^2 dm^-6, Calculate the Solubility at this temperature.

Cc DrHost, Polymath, PrOton ,Buuhmhite, thaotech, mikechibuzor, Dr.Sage, Whales2020, FunkySilver et al

1. 3.3*10^-10
2. 1.6*10^-7...waiting

horpeyemmi66:
Woah!, its great been back here again...I was forced to go on a Sabbathical by PHCN.

I would go laconic now, brevity is beautiful.

@Bhuumhite, am gunning for Physiology dear, hopefully am gonna leave that department in the fall of 2016.

@Seunvense, your addition was duly noted; ref: "MBBS Students will do all of this excluding BOT174"

@DrHost, baba I don dey miss you ooh!, wetin man go do...

@Cassyrooy, "Ojukwu is dead but his manhood lives on", (quoted from Words on Marble by Mrs. Jonathan)...I guess Ojukwu had too many wives.
Cc Sir. thankyouJesus...stop officiating his weddings!

@Mikechibuzor, your plight shall be looked into by Sir. PrOton. I like your style of approach but you jumbled up some parameters.

@Polymath, the "FIGHTING-CROONER", how have you been, I know you must be doing great!...you ALMOST dealt with my question, nevertheless.

@thaotech, thanks for attempting the Physics question, you actually amazed me.
----------------------------------------------
Solution to the Physics question.

i) for the 4kg mass moving downwards: 4g-T=4a..........equ 1
for the 3kg moving upwards: T-3g=3a.

After you do the simultaeneos abracadabra, your a=1.43m/s2(common acceleration)

ii) Their speed after 2 seconds
v=u + at
u= 0, body accelerating from rest
a=1.43m/s2
therefore. V=0 + 1.43x 2
V=2.9m/s

iii) The distance each travelled in two seconds:
S= ut + 1/2 at^2
S= 0 + 1/2 at^2
S= 1/2 x 1.43 x 2^2
S=1/2 x 1.43 x 4
S= 2.9m

Post Script: @Dapo777, your advice has been laudable and I really appreciate it. People are jacking, obviously...instilling fear with the words"ui will only pick the best, post ume is like a war" you use aint helping matters!

I filled with trepidation by pessimists when I wanted to write common entrance, Junior WAEC, Senior WAEC, JAMB, Pre-Degree test and FinaL Exam....guess what?...I passed all of them exceedingly well!...U.I is not gonna be an exception for me or anyone on this thread by the Power in the name of Jesus. #Constructive criticism please.

cool boss

horpeyemmi66:
*PHYSICS
A Light inextensible string passes over a smooth Pulley and carries masses of 4kg and 3kg at its ends, the masses are released from rest,
find:
1. Their common acceleration
2. Their speed after two seconds
3. The distance travelled at that time(Take g=10m/s^2)

You welcome Bhuumhite, what course?

cc Bhuumhite, Polymath, Dr.Host, Dr.Sage, Whales2020 et al

acceleration =17.14
velocity= 34.28
distance=108.56 not too sure abt the distance .....modified.....kinda made a lapse a = 1.42 v=2.84 and s=5.86....waiting

good morning to you all

Good morning House....following

Ifyx *thanks*[b]Ifyx *thanks*[/b]Ifyx *thanks*

Ifyx: Bayo and his wife Ola received a letter from

......oga ifyx please na...the pq...oluwatboi@yahoo.com....God bless u as u do so

Ifyx: av sent it bro

plz dnt 4get a broda...oluwatboi@yahoo.com...thnkz nd God bless

Plz when iz d p utme likely to hold and would it be afta the waec result is out??