₦airaland Forum

Nuel25846:
A 50W electric heater is used to heat
a metal block of mass 5kg. If in 10 minutes a temperature rise of 12oC is achieved, the specific heat capacity of
the metal is A. 400 J kg-1K-1 B. 500 J kg-1K-1 C. 390 J kg-1K-1 D. 130 J kg-1K-1

Pt = mc0

c = pt/m0
c = 50 * 10 * 60/ 12 * 5
c = 500.... B.

Optimist1998:
Wow your method is even better.
I calculated the area of the two triangles within the 2nd and 5th second then summed them up.

you could also relate two equations of motion

Nuel25846:
As the pressure of a fluid increases,
its viscosity A. decreases B. increases C. increases then decreases D. remains constant

I saw this question last night during a solving session, took a considerable amount of time analysing it.... funny enough even the internet is confused about the answer

Some say pressure affects viscosity for most liquids if the pressure is large enough, others say pressure is negligible in liquids and would only affect gases.

Jamb better not be this trivia!!!

castrokiller:
Correct.... But u didn't give formula

a = change in length/ original length * change in temperature... linear expansivity bro

castrokiller:
try again.... Just note that compression is the area where sound waves are pushed together

Rarefaction maybe?

felix00:
35x/100+37y/100=35.5 eqn 1 X+y=100 eqn 2 Multiply eqn 1 by 100--- 35x+37y=3550 Eqn 2 x=100-y____ sub it in 35x+37y=3550 The rest is history

Damn!... Good one

jearile:
Would it be possible to choose an exam center that's located outside the state you did your jamb registration? For instance, can somebody leaving in Lagos be allowed to choose an exam centre in Port Harcourt?

sure!... you'll be asked to pick an exam state/town

Optimist1998:
Basic velocity Time graph from SS1
Calculate the displacement between t = 2s and t = 5s of an object that moves along an axis and has the speed characterized below.

D. 1.5m

for some weird reason I get a ban whenever I quote optimist1998

anyway, to your question on linear expansivity, I got D as the answer... is it correct?

Optimist1998:
Unanswered for days

C - 830

Lenz's law is a law of conservation of

a. energy b. Momentum c. electric current d. Electric charge

If two charge plates are maintained at a potential difference of 3kV, the work done in taking a charge of 600uC across the field is

a. 9.0j b. 0.8j c. 18.0j d. 1.8j

kristian98:
even though.
your multiplication has a flaw. 100 x 4.2 x 40 =1680 and not 16800
you would still arrive at 168

past questions are mostly stupid... another rule of mine.

you sure the values are correct? maybe a typo somewhere or the question is just wrong

Optimist1998:
But all the units are in grams.....
any need to convert to Kg?

just a rule of mine... "Never solve physics is grams or chemistry in kilograms". I hate it when S.I unit f**ks up my work

Optimist1998:
H= mc@
H=100x4.2x40
=168000

If 16g of methane liberated 168000 of heat
0.16g will liberate 168000x0. 16/16
=1680

sorry mister its 168....

Q = Mc0
= 0.1*4200*40(I converted to kg)
= 16800

mole ratio = 0.16/16 = 0.01

0.01*16800 = 168

Optimist1998:
I was already calcuating It was looking like a question on cells/batteries/EMF

hehehe.... someone either likes physics too much or fears it.

Optimist1998:
What the ?!
At first I thought it was a physics question...
I'm going with III

it biology na.... 1% would be correct.

A hypotonic solution would cause inflow of water into the cell hence increasing its osmotic pressure

kristian98:
Pls show workings for the first question on electricity

forgive my handwriting... I hope you get it

felix00:
correct

IemFava:
4768

Seriously that question is somewhat

Is the new pressure and volume suppose to be 4PV or 4P4V?

A direct current of 5A flows through a 0.2H inductor. Calculate the energy stored in the inductor

a. 0.5j b. 1.0j c. 2.5j d. 5.0j

Masses m1 and m2 at the 20-cm and 65cm marks respectively of a uniform rule freely suspended at it centre of gravity. If the metre rule balances horizontally, determine the ratio m2:m1

a. 2:1 b. 3:3 c. 2:3 d. 1:2

Optimist1998:
Density= mass/volume
From mathematics; volume=lxbxh
Area=lxb (or multiply any
two and you'll get area)

Density=mass/lxbxh
You can continue from there.

Thanks... didn't think it that way.

Optimist1998:
Comman see Moment questions

---

A man holds a 100 N load stationary in his hand. The combined weight of the forearm and hand is
20 N. The forearm is held horizontal, as shown
https://servantboy.com/wp-content/uploads/2016/11/Capture-131.jpg

What is the vertical force F needed in the biceps?{cambridge may/june 2014 p11 ques 12}
A 750 N
B 800 N
C 850 N
D 900 N

C

Godhead4:
The period (T) of a simple pendulum depends only on

a) the mass of the Bob
b) length of the pendulum
c) acceleration due to gravity
d) the force causing the acceleration

Ban is lifted!!!!

I'd go for B

SEEDORF441:
Hello aos, is it true dat a person using awaiting result can not participate in this year jamb?

it's not true... you are eligible to write but you better have your result before the end of July.

Pweedycutie:
plz wat formula did you use and how did yhu go about it

General gas equation...

PV/298 = 4PV/T... solve for T

Nuel25846:
I would go with A.

castrokiller:
I will go with b

y'all should give reasons for your choices

Pweedycutie:
A certain volume of gas at 298k is heated such that its volume and pressure are now four times their original value. whats the new temperature?

1192K

castrokiller:
Is it from past question

No its not

castrokiller:
Aphid produces young ones alive without mating..... So its aphid

You are correct but the options are wrong... Tse-Tse fly also exhibit viviparity

Donpre:
An organism that exhibits viviparity is a.termite b.Pisces c.Tse-tse fly d.Aphid

Nobody got this question right... B is definitely wrong!

Optimist1998:
Electricity
A cell can supply current of 0.4 A and 0.2 A through a 4.0Ω and 10.0Ω resistors respectively.
This internal resistance of the cell is
A. 2.0Ω
B. 1.0Ω
C. 2.5Ω
D. 1.5Ω

A

Density
A piece of wood of mass 40g and uniform cross-sectional area of 2cm 2 floats upright in water. The length of the wood immersed is
A. 30cm
B. 40cm
C. 20cm
D. 2cm

Area and length in density?.. mehn I gotta read

Two objects, one having three times the mass of the other, are dropped at the same time from a tall building. When they are above the ground, the two objects will have the same
A. Momentum
B. Kinetic energy
C. Potential energy
D. Acceleration

What is really constant?!

D

If the load at the end of a sonometer wire is immersed in a bucket of water, the original fundamental frequency of the wire could be
restored by
A. decrease the length of the wire
B. increasing the length of the wire
C. increasing the mass per unit length of the wire
D. changing the temperature of the wire

No idea

The linear expansivity of a metal P is twice that of another metal Q. When these materials are heated through the same temperature change, their increase in length is the same. Calculate the ratio of the original length of P to that of Q.
A. 1:4
B. 1:2
C. 2:1
D. 4:1
E. 6:1

B