Optimist1998:

[b]Physics
If a positively charged glass-rod is used to charge an electroscope X by contact and an electroscope Y by induction, then
A. X and Y will be negatively charge
B. X and Y will be positively charged
C. X will be negatively charged and Y positively charged
D. X will be positively charged and Y negatively charged
E. X will be positively charged and Y will remain uncharged

C.. I think

In a meter bridge experiment, two resistor 2ΩΩ and 3ΩΩ occupy the left and right gaps respectively. Find the balance point from the left side of the bridge

I don't even know what to do here

Physics If a positively charged glass-rod is used to charge an electroscope X by contact and an electroscope Y by induction, then A. X and Y will be negatively charge B. X and Y will be positively charged C. X will be negatively charged and Y positively charged D. X will be positively charged and Y negatively charged E. X will be positively charged and Y will remain uncharged Ans.A

Donpre:
If a sound wave goes from a cold air region to a hot air region, its wavelength will

A. increase
B. decrease
C. decrease then increase
D. remain constant

Give reason

The answer is B....sound wave needs s medium to propagate,so it travels faster in a dense medium(cold air) than a less dense medium(hot air).
Speed=wavelenght * frequency

Optimist1998:
Chemistry
Cr2O7 + 6Fe2+ + 14H+ → 2Cr3+ +6Fe3+ + 7H2O. In the above , the oxidation number of chromium changed from?
A. +7 to +3
B. +6 to +3
C. +5 to +3
D. -2 to +3

A

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Optimist1998:
Did you take note of the negative sign in the first triangle?

Then my answer is 1.5m. What did you get?

Nuel25846:

The answer is B....sound wave needs s medium to propagate,so it travels faster in a dense medium(cold air) than a less dense medium(hot air).
Speed=wavelenght * frequency

No this is not about density, it's temperature.

SamanN:



Then my answer is 1.5m. What did you get?

I got 1.5 too

Chemistry
The equation PaVbTc= constant reduces to Charles Law if
A. a=1, b=1and c=0
B. a=1, b=0 and c=-1
C. a=0, b=1 and c=1
D. a=0, b=1 and c=-1

Physics

In the diagram above, the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static friction between the mass m1 and the table is
A. m1/m2
B. m1g/m2
C. m2/m1
D. m2g/m1

Donpre:
Chem
1. A 2. E

IemFava:
A

You're both correct

Nuel25846:

The answer is B....sound wave needs s medium to propagate,so it travels faster in a dense medium(cold air) than a less dense medium(hot air).
Speed=wavelenght * frequency

the answer is A
sounds travel fast in hot region dan cold..

Nuel25846:
Physics If a positively charged glass-rod is used
to charge an electroscope X by contact
and an electroscope Y by induction, then
A. X and Y will be negatively charge
B. X and Y will be positively charged
C. X will be negatively charged and Y positively charged
D. X will be positively charged and Y
negatively charged
E. X will be positively charged and Y will
remain uncharged
Ans.A

Why A........ and Donpre why C?

I don't even know what to do here

The metre bridge is 100cm long
If you place one of the resistors at one end x
The other resistor will be at 100-x

optimist1998 and Donpre am I wrong abt that sound wave

[quote author=Optimist1998 post=55313156]Chemistry
The equation PaVbTc= constant reduces to Charles Law if
A. a=1, b=1and c=0
B. a=1, b=0 and c=-1
C. a=0, b=1 and c=1
D. a=0, b=1 and c=-1

Physics

In the diagram above, the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static friction between the mass m1 and the table is
A. m1/m2
B. m1g/m2
C. m2/m1
D. m2g/m1[/quotez
Chem ans-D
Phy ans-A

Nuel25846:
optimist1998 and Donpre am I wrong abt that sound wave

Cold air is thicker and heavier than warm air and
Sound waves depend on the movement of air for propagation. Air molecules are like vehicles while sound waves are passengers.
Dense thick cold air==== Big fat slow trailer C
Less dense Hot air=====Toyata Camry

Now which one of the passengers would enjoy a quicker ride?
Knowing that velocity/speed is directly proportional to wavelength

---

I think CHIZZNEWS and SamanN got it right.

Nuel25846:
optimist1998 and Donpre am I wrong abt that sound wave

Sound travels FARTHER in cold air (e.g at night) but travels FASTER in warm air (e.g at noon). Now, we are talking about speed. From Velocity =frequency x Wavelength, if velocity increases, wavelength should increase since frequency is constant. That's how I see it!

Physics
An aircraft travelled from calabar to kano as follows: it flew first to illorin converging a distance of 300km, 30° west of North, and then flew 400km, 60°East of North to kano. What is the resultant displacement?

Chemistry
Which of the following is seperated by fractional crystallization
A. HNO3 and NaCL
B. KNO3 and NaOH
C. CaCl2 and HNO3
D. CaSO4 and NaNO3
E. KNO3 and NaCl

Group I elements are relatively soft due to their
A. Strong metallic bond
B. Strong covalent bond
C. Weak metallic bond
D. Weak vander waals force
E. Weak metallic bond

Which of the following can be extracted using Thermit process
A. Al
B. Na
C. Fe
D. Ca
E. Sn

Optimist1998:
Chemistry
Which of the following is seperated by fractional crystallization
A. HNO3 and NaCL
B. KNO3 and NaOH
C. CaCl2 and HNO3
D. CaSO4 and NaNO3
E. KNO3 and NaCl

D
Group I elements are relatively soft due to their
A. Strong metallic bond
B. Strong covalent bond
C. Weak metallic bond
D. Weak vander waals force
E. Weak metallic bond

E

Which of the following can be extracted using Thermit process
A. Al
B. Na
C. Fe
D. Ca
E. Sn

C
Equation for thermit process

[quote author=Nuel25846 post=55313716][/quote]

I don't think your physics answer is right

A=o and b and c is 1 since they are directly relatrd

Optimist1998:
Chemistry Which of the following is seperated by fractional crystallization A. HNO3 and NaCL B. KNO3 and NaOH C. CaCl2 and HNO3 D. CaSO4 and NaNO3 E. KNO3 and NaCl
Group I elements are relatively soft due to their A. Strong metallic bond B. Strong covalent bond C. Weak metallic bond D. Weak vander waals force E. Weak metallic bond
Which of the following can be extracted using Thermit process A. Al B. Na C. Fe D. Ca E. Sn

Please


The first one should be option E, they are both salt; and soluble.

SamanN:
Please



The first one should be option E, they are both salt; and soluble.

Yeah very correct.

Donpre:
The physical and climatic factors of a region primarily determine the?

A. kinds of animals inhabiting the area
B. types of plants found in the area
C. nature of the soil in the region
D. community of organisms in the region

D
My ridiculous reason:
Soil type, topography and Amount of rainfall/light determines the type of organisms you'll find in a region.
Sokoto has a minute amount of rainfall and a unique topography, hence, a completely different community of organisms.

Optimist1998:
Chemistry
The equation PaVbTc= constant reduces to Charles Law if
A. a=1, b=1and c=0
B. a=1, b=0 and c=-1
C. a=0, b=1 and c=1
D. a=0, b=1 and c=-1

Physics

In the diagram above, the hanging mass m2 is adjusted until m1 is on the verge of sliding. The coefficient of static friction between the mass m1 and the table is
A. m1/m2
B. m1g/m2
C. m2/m1
D. m2g/m1

.
The first one is D V/T=constant. The second is suppose to be D am not sure pls confirm and don't ask me to explain

[quote author=Optimist1998 post=55315261][b]Chemistry

Group I elements are relatively soft due to their
A. Strong metallic bond
B. Strong covalent bond
C. Weak metallic bond
D. Weak vander waals force
E. Weak metallic bond
Ans should be E... Reason: they have only one free electron available for d bond

It should be 1 raise to power of -1. I got confused.

Okay it's been a long time dat i have been watching dis thread...And i love what u are doing... i have a coorection to make to dis question dat has to do with coefficient of friction...
Now u must understand Stokes law before u can do dat..so lemme explain... For :
M1: Since it is at d verge of sliding.... d Acceleration is =0.. derefore... T which is d tension is equals Coefficient of friction * M1g i.e T = u * M1g...
Now for Mass m2 Since d weight is more than d tension in d string.... M2g - T = m2A( Newton 1st law abt net force)... and dont forget dat at d point of sliding a =0 derefore M2g = T.. hence, since T = u*m1g ..therefore M2g = u*m1g... derefore u = M2/M1...
Thats it... hope it helps

Optimist1998:

D
My ridiculous reason:
Soil type, topography and Amount of rainfall/light determines the type of organisms you'll find in a region.
Sokoto has a minute amount of rainfall and a unique topography, hence, a completely different community of organisms.

keyword "primarily"

primarily it should determine the nature of soil which would in turn determine the community... that's how I see it tho

Nuel25846:
optimist1998 and Donpre am I wrong abt that sound wave

seriously I think wavelength should increase... but on myschool many are arguing that 'decrease' would be correct https://myschool.com.ng/school/classroom/physics/q=17-pg=1

Optimist1998:

Why A........ and Donpre why C?

Too long to explain... what's the answer anyway

The metre bridge is 100cm long
If you place one of the resistors at one end x
The other resistor will be at 100-x

Topic please

examprepng:
INTRODUCING CAREER ANALYTICS
[/b]Knowledgeware Career Analytics is designed to assist students overcome one of the most prevailing challenges faced by students in Nigeria i.e. the challenge of choosing the right career path. More importantly, Career Analytics provides a platform that enables students easily rate their chances of being provisionally admitted into any higher institution in Nigeria.

[b]HOW TO RATE YOUR ADMISSION CHANCES

Step 1: Visit jambanalytics.examprep.ng
Step 2: Click the link "Rate Your Chances Here" at the top right end of the page homepage.
Step 3: Select Institution Category i.e. University, Polytechnic etc.
Step 4: Select Institution from the list of available institutions. This is dependent on the Category selected in Step 3.
Step 5: Select Faculty and course and click "Continue"
Step 6: Scroll down and Click the "Rate Yourself" [/b]button at the bottom of the page
[b]Step 7: Select five O'Level subjects (including English Language) and their respective grades and Click the "Process" button. Your total O'Level Score and minimum expected UTME score in percentage will be displayed.
NOTE: You can change the subject combinations by Clicking "Change Combination" button
Step 8: Click "Send to my Email" button to send the report to you email address.
Step 9: Enter your Email Address in the text box provided and Click "Send". A report will be sent to your email address

Just did it,thank you very much.