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Eben331:
A resonance tube is 40cm long. The tube is three-quarter full. What is the frequency of the turning fork placed near the mouth of the tube? (velocity of sound in air=334m/s) (A) 2511Hz (B) 1670Hz (C) 835Hz (D) 345Hz PLS SHOW YOUR WORKINGS!!

I think BiafranDel is correct.....
I got 835Hz which is C

....

[7/21, 20:47] Feranmi: © 2018 POST UTME TOP SECRETS FORUM

*2018 LIKELY POST UTME QUESTIONS*

*CHEMISTRY : 21/07/18(19:00 GMT* )

*PART ONE*

*10 QUESTIONS : 5 MINUTES*

*INSTRUCTIONS*

Ensure that you take this test within the Stipulated time

Ensure that you Submit all yours answers together and at once to the Forum before the Authentic answers are released

Ensure that you Post your Scores to the Forum for My Evaluation.

1. The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as
A. Tyndal effect
B. diffusion
C. osmosis
D. brownian movement

2. The mass number of an element is the sum of its
A. electrons, neutrons and protons
B. electrons and protons
C. protons and neutrons
D. orbital electrons

3. Radon is used as a tracer in medical research because it
A. is monatomic
B. is radioactive
C. is a noble gas
D. has a complete valence

4. What is the most probable group of an element which is a soft, silvery white solid and reacts violently with water?
A. Group 0
B. Group 1
C. Group 4
D. Group 6

5. In linear molecules, the bond angle is
A. 90°
B. 140°
C. 109°
D. 180°

6. An acid is a substance which in the presence of water produces
A. salts
B. oxygen
C. effervescence
D. hydroxonium ions

7 A sodium atom and a sodium ion have the same
A. number of neutrons
B. number of electrons
C. electric charge
D. electronic structure

8. If the atomic number of an element X is 11 and that of nitrogen is 7, the most likely formula of the nitride of X is
A. X3N
B. XN3
C. X3N2
D. N2X

9. An increase in the pressure of a gas results in a decrease in its
A. mass
B. vapour density
C. volume
D. temperature

10. Zinc Oxide is a
A. Basic Oxide
B. Acidic Oxide
C. Amphoteric Oxide
D. Neutral Oxide
[7/21, 20:47] Feranmi: © 2018 POST UTME TOP SECRETS FORUM

*2018 LIKELY POST UTME QUESTIONS*

*CHEMISTRY : 18/08/18(19:00 GMT* )

*PART ONE*

*10 QUESTIONS : 5 MINUTES*

*INSTRUCTIONS*

Ensure that you take this test within the Stipulated time

Ensure that you Submit all yours answers together and at once to the Forum before the Authentic answers are released

Ensure that you Post your Scores to the Forum for My Evaluation.

1. The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as
A. Tyndal effect
B. diffusion
C. osmosis
D. brownian movement

2. The mass number of an element is the sum of its
A. electrons, neutrons and protons
B. electrons and protons
C. protons and neutrons
D. orbital electrons

3. Radon is used as a tracer in medical research because it
A. is monatomic
B. is radioactive
C. is a noble gas
D. has a complete valence

4. What is the most probable group of an element which is a soft, silvery white solid and reacts violently with water?
A. Group 0
B. Group 1
C. Group 4
D. Group 6

5. In linear molecules, the bond angle is
A. 90°
B. 140°
C. 109°
D. 180°

6. An acid is a substance which in the presence of water produces
A. salts
B. oxygen
C. effervescence
D. hydroxonium ions

7 A sodium atom and a sodium ion have the same
A. number of neutrons
B. number of electrons
C. electric charge
D. electronic structure

8. If the atomic number of an element X is 11 and that of nitrogen is 7, the most likely formula of the nitride of X is
A. X3N
B. XN3
C. X3N2
D. N2X

9. An increase in the pressure of a gas results in a decrease in its
A. mass
B. vapour density
C. volume
D. temperature

10. © 2018 POST UTME TOP SECRETS FORUM

*2018 LIKELY POST UTME QUESTIONS*

*CHEMISTRY : 21/07/18(19:00 GMT* )

*PART ONE*

*10 QUESTIONS : 5 MINUTES*

*INSTRUCTIONS*

Ensure that you take this test within the Stipulated time

Ensure that you Submit all yours answers together and at once to the Forum before the Authentic answers are released

Ensure that you Post your Scores to the Forum for My Evaluation.

1. The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as
A. Tyndal effect
B. diffusion
C. osmosis
D. brownian movement

2. The mass number of an element is the sum of its
A. electrons, neutrons and protons
B. electrons and protons
C. protons and neutrons
D. orbital electrons

3. Radon is used as a tracer in medical research because it
A. is monatomic
B. is radioactive
C. is a noble gas
D. has a complete valence

4. What is the most probable group of an element which is a soft, silvery white solid and reacts violently with water?
A. Group 0
B. Group 1
C. Group 4
D. Group 6

5. In linear molecules, the bond angle is
A. 90°
B. 140°
C. 109°
D. 180°

6. An acid is a substance which in the presence of water produces
A. salts
B. oxygen
C. effervescence
D. hydroxonium ions

7 A sodium atom and a sodium ion have the same
A. number of neutrons
B. number of electrons
C. electric charge
D. electronic structure

8. If the atomic number of an element X is 11 and that of nitrogen is 7, the most likely formula of the nitride of X is
A. X3N
B. XN3
C. X3N2
D. N2X

9. An increase in the pressure of a gas results in a decrease in its
A. mass
B. vapour density
C. volume
D. temperature

10. Zinc Oxide is a
A. Basic Oxide
B. Acidic Oxide
C. Amphoteric Oxide
D. Neutral Oxide

@Nltaliban (1) D (2) C (3) B (4) B (5) D (6) D (7) A ( A (9) C (10) C

DrBESTJC:


I think BiafranDel is correct.....
I got 835Hz which is C

I think you are both correct because this is what I always get but the guy said he saw it from OAU Post Utme Past Questions and the answer there was 2511Hz.

The correct answers are marked with *

Nltaliban:
[7/21, 20:47] Feranmi: © 2018 POST UTME TOP SECRETS FORUM

*2018 LIKELY POST UTME QUESTIONS*

*CHEMISTRY : 21/07/18(19:00 GMT* )

*PART ONE*

*10 QUESTIONS : 5 MINUTES*

*INSTRUCTIONS*

Ensure that you take this test within the Stipulated time

Ensure that you Submit all yours answers together and at once to the Forum before the Authentic answers are released

Ensure that you Post your Scores to the Forum for My Evaluation.

1. The phenomenon observed when dust particles collide randomly in a beam of sunlight is known as
A. Tyndal effect
B. diffusion
C. osmosis
D. brownian movement *

2. The mass number of an element is the sum of its
A. electrons, neutrons and protons
B. electrons and protons
C. protons and neutrons *
D. orbital electrons

3. Radon is used as a tracer in medical research because it
A. is monatomic
B. is radioactive *
C. is a noble gas
D. has a complete valence

4. What is the most probable group of an element which is a soft, silvery white solid and reacts violently with water?
A. Group 0
B. Group 1 *
C. Group 4
D. Group 6

5. In linear molecules, the bond angle is
A. 90°
B. 140°
C. 109°
D. 180° *

6. An acid is a substance which in the presence of water produces
A. salts
B. oxygen
C. effervescence
D. hydroxonium ions *

7 A sodium atom and a sodium ion have the same
A. number of neutrons *
B. number of electrons
C. electric charge
D. electronic structure

8. If the atomic number of an element X is 11 and that of nitrogen is 7, the most likely formula of the nitride of X is
A. X3N *
B. XN3
C. X3N2
D. N2X

9. An increase in the pressure of a gas results in a decrease in its
A. mass
B. vapour density
C. volume *
D. temperature

10. Zinc Oxide is a
A. Basic Oxide
B. Acidic Oxide
C. Amphoteric Oxide *
D. Neutral Oxide

Aceed:


White phosphorus is stored under water
because it is?

It has a low ignition temperature and so catches fire spontaneously in air.

Aceed:

The colour of the positive column in a gas discharge tube is characteristic of the A. Gas and the coating in the tube B. Pressure of the gas only C. Temperature of the gas only D. Pressure and potential difference

A

Aceed:
A man takes 16 breaths per minute at 18°C
and 760mmHg.What is his rate of breathing
on a mountain-top where the temperature is
-5°C and the pressure is 240mmHg. Assume
that he needs the same mass of air per
minute.

47 breaths per minute.

Aceed:



What type of electromagnetic radiation
can be used to take photographs in the
haze?
A. Radio waves
B. Visible rays
C. Ultraviolet rays
D. Infrared rays

D - Infrared rays are easily detected by special photographic films and it can be used for taking photographs in haze.

Eben331:
47 breaths per minute.

how did u get dat?

hi dudes,whc suitable english text book can i read for ui post utme?

esivue007:
hi dudes,whc suitable english text book can i read for ui post utme?

You can get invisible teacher by Dele Ashade

Hardebaryor:
You can get invisible teacher by Dele Ashade

are you sure that its gonna be suitable?

im gonna get dat straight away.

Aceed:


What is the efficiency of a cell
with internal resistance of 3ohms,
when it supplies current to a 7ohms
resistor?

Solution.

The efficiency of a cell can be given by the formula:
Efficiency = External Resistance,R/ Internal Resistance,r + External Resistance,R. x 100%
i.e Efficiency = (R/r + R) x 100%
From the question,
External Resistance,R = 7 ohms .....and
Internal Resistance,r = 3 ohms
Substituting the values in the equation above, we have that:
Efficiency = (7/3 + 7) x 100% = (7/10) x 100% = 0.7 x 100% = 70%

Aceed:


What is the upthrust on a body which displaces
0.6m^3 of water, 0.5m^3 of methylated spirit?
(density of water = 10^3 kgm^-3, density of
methylated spirit = 0.8 x 10^3 kgm^-3 and
g = 10ms^-2)

Solution:
Upthrust = density x volume x acceleration due to gravity(g).

For the body that displaced 0.6m³ of water;
Upthrust = 1000 x 0.6 x 10 = 6000N

For the body that displaced 0.5m³ of methylated spirit;
Upthrust = 800 x 0.5 x 10 = 4000N

Aceed:



The horizontal door of a submarine at a depth of 500m has an area of 0.4m^2.
Calculate the force exerted by the sea water on the door at this depth.
(R.D of seawater = 1.03, atm = 1.01x 10^5Nm^-2, Density of pure water = 1000kgm^-3, g = 10ms^-2)

Solution:
Pressure = Density x g x height
Density of seawater = 1030
.: Pressure = 1030 x 10 x 500m = 5150000 Nm² .
But,
Pressure = Force/Area.
.: The force exerted by the sea water on the door of area 0.4m³ at a depth of 500m = Pressure x Area = 5150000 x 0.4 = 2060000N = 2.06 x 10⁶ N

miracood:
how did u get dat?

let V=rate of breathing per minute. Using the formula: P1V1/T1=P2V2/T2 P1=760mmHg, V1=16 breaths per min, T1=18^oC=(18+273)K=291K, P2=240mmHg, V2=? T2=-5^oC=(-5+273)K=268K. Make V2 the subject of the formula: V2=P1*V1*T2/P2*T1 By substituting the values, we have V2=760*16*268/240*291=46.66 breaths per minute or 47 breaths per minute (approx.)

Aceed:



An object of mass 1kg falls a distance
of 5m onto a horizontal surface and
rebounds to a vertical height of 2m.
Calculate the change in momentum.

Solution.

Initial velocity of the body before falling from a distance of 5m = 0m/s.
Final velocity(V) of the body just before hitting the horizontal surface can be gotten by using the formula:
V² = u² + 2gh = 0 + 2 x 10 x 5m = 100.
.: V = squaroot of 100 = 10m/s

Final velocity after the body reached its maximum height on rebound is of course 0m/s......and
Initial velocity(u) with which the body rebounds to a height of 2m can be gotten by the formula:
V² = u² - 2gh.
Note the negative sign here because the body is now moving against gravity on rebounding.
Here, V = 0m/s.
.: 0 = u² - 2gh
- u² = -2gh
.: u = squareroot of (2 x 10 x 2) = 6.325 m/s

Change in momentum = mv - mu.
If momentum of the object on hitting the floor is positive,it implies that its momentum on moving away from the floor is negative.
Where m = 1kg.....
.: Change in momentum = mv - (- mu) = mv + mu = (1 x 10) + (1 x 6.325) = 16.325 Ns

Guys get UI post utme past questions contact 07052081568

Sammiecartier:
Guys get UI post utme past questions contact 07052081568

There is nothing like UI Past Questions, they always collect the questions back frm students since 2015. What we have is Sample Questions/Practice Questions which every candidate will see on his/her portal when registering.

Aceed:



A man whose mass is 80kg stands on a
spring weighing machine inside an
elevator. What is the reading of the
weighing machine when the elevator is
coming to rest with a retardation of
4.0ms^-2?

Solution.

The apparent weight of the man when the elevator moves up with an acceleration is given by:
W = m(g + a)
But in this question,the elevator is coming to rest(upwards) with a deceleration, -a .
.: the equation becomes:
W = m(g - a).
Substituting the values, we have that:
W = 80 x (10 - 4) = 80 x 6 = 480N or 48 Kg.

Aceed:



A 15.0kg of monkey hangs from a cord
suspended from the ceiling of an elevator.
The cord can withstand a tension of 200N
and breaks as the elevator accelerates.
What was the elevator's minimum accleration
(in magnitude and direction)? g = 10ms^-2



Solution:
Using the formula:
W = m(g + a)
200 = 15 x (10 + a)
200 = 150 + 15a
200 - 150 = 15a
50 = 15a
a = 50/15 = 3.33m/s...in the upward direction.
I think that this should be the maximum not minimum acceleration because above this acceleration(3.33m/s), tension becomes greater than 200;meaning that any acceleration above this will cause the cord to break.

(1) The type of motion that occurs during conduction is __ (a) translational motion (b) random motion (c) simple harmonic motion (d) vibratory motion (e) oscillatory motion (2) Which one of the following is not used in the formation of a pure spectrum? (a) plane mirror (b) convex lens (c) prism (d) slit (e) screen (3) A p-n junction diode can be used for __ (a) current rectification (b) voltage amplification (c) current amplification (d) voltage rectification (4) The diode valve is an application of the principle of __ (a) thermionic emission (b) photoelectric effect (c) seeback effect (d) Band theory.

Eben331:
(2) Which one of the following is not used in the formation of a pure spectrum? (a) plane mirror (b) convex lens (c) prism (d) slit (e) screen

Answer: A

Reason

Pure Spectrum

When a triangular prism is used only, an impure spectrum is produced,one in which the colours are indistinct. To produce a pure spectrum; two convex lenses, a triangular prism, a screen and a light source with narrow slit are needed.

Quick Revision Questions in PHYSICS

Answer all 25 questions in 20 minutes !

Test of Speed and Accuracy

Typical UI PostUTME Questions

Exam is already here !

1) Water does not drop through an open umbrella of silk material unless the inside of the umbrella is touched. This is due to...?
A) capillarity
B) osmotic pressure
C) viscosity
D) surface tension

2) A force of 100N is used to kick a football of mass 0.8Kg. Find the velocity with which the ball moves if it takes 0.8 seconds to be kicked.
A) 32 m/s
B) 50 m/s
C) 64 m/s
D) 100 m/s

3) A piece of stone attached to one end of a string is whirled round in a horizontal circle and the string suddenly cuts. The stone will fly off in a direction :
A) perpendicular to the circular path
B) parallel to the circular path
C) tangential to the circular path
D) towards the center of the circle

4) Which one of the following is not used in the formation of a pure spectrum...?
A) convex lens
B) plane mirror
C) triangular prism
D) narrow slit
E) screen

5) A 90cm uniform lever has a load of 30N suspended at 15cm from one of its ends. If the fulcrum is at the center of gravity,the force that must be applied at its other end to keep it in horizontal equilibrium is...?
A) 15N
B) 20N
C) 30N
D) 60N

6) By what factor will the size of an object placed 10cm from a convex lens be increased if the image is seen on a screen placed 25cm from the lens...?
A) 15.0
B) 2.5
C) 1.5
D) 0.4

7) If an object is placed between two parallel plane mirrors with their reflecting surfaces facing each other, how many images of the object will be formed...?
A) Infinite
B) Eight
C) Four
D) Two

8 ) At what position will an object be placed in front of a concave mirror in order to obtain an image at infinity...?
A) at the pole of the mirror
B) at the principle focus
C) at the center of curvature
D) between the principal focus and the center of curvature

9) The operation of an optical fibre is based on the principle of...?
A) dispersion of light
B) interference of light
C) refraction of light
D) polarization of light

10) A wire of 5 ohm resistance is drawn out so that its new lenght is two times the original lenght. If the resistivity of the wire remains the same and the cross-sectional area is halved,the new resistance is...?
A) 40 ohm
B) 20 ohm
C) 10 ohm
D) 5 ohm

11) Which of the following pairs of light rays shows the widest separation in the spectrum of white light...?
A) Blue and Red
B) Green and yellow
C) Indigo and violet
D) Orange and Red

12) The most suitable cell used for short interval switches in electric bells is a...?
A) Lead-acid accumulator
B) Daniel cell
C) Leclanche cell
D) Nickel iron accumulator.

13) The count rate of a radioactive material is 800 count/min. If the half-life of the material is 4days,what would the count rate be 16 days later ?
A) 200 count/min
B) 100 count/min
C) 50 count/min
D) 25 count/min

14) The major difference between a pure semiconductor and a pure metal is that :
A) metals are harder than semiconductors
B) while the resistance of metals decreases with temperature,the reverse is the case for semiconductors
C) the resistance of metals increases with temperature,while for semiconductors,it is the reverse
D) metals have forbidden gaps while semiconductors have not.

15) When a nucleus is formed by bringing protons and neutrons together,the actual mass of the formed nucleus is less than the sum of the masses of the constituent protons and neutrons. The energy equivalent of this mass difference is the...?
A) lost energy
B) work function
C) binding energy
D) stability energy

16) A generator-manufacturing company was contracted to produce an a.c. dynamo but inadvertently produced a d.c. dynamo. To correct this error,the:
A) armature coil should be made of silver
B) commutator should be replaced with slip rings
C) commutator should be replaced with split rings
D) armature coil should be made of aluminium

17) a radioisotope has a decay constant of 10^-7second^-1 . The average life of the radioisotope is...?
A) 1.00 x 10⁷ seconds
B) 6.93 x 10⁸ seconds
C) 1.00 x 10^-7 seconds
D) 6.93 x 10⁷ seconds

18 ) In a reverse biased junction diode,current flows in by
A) positive holes alone
B) majority carriers
C) electrons alone
D) minority carriers

19) The instrument used for securing a large number of similar charges by induction is called
A) electrophorus
B) capacitor
C) proof-plane
D) electroscope

20) Given three capacitors 0.3uF , 0.5uF, and 0.2uF, the joint capacitance when arranged to give minimum capacitance is...?
A) 0.1 uF
B) 0.3 uF
C) 1.0 uF
D) 0.5 uF

21) The difference between x-rays and gamma rays is that
A) x-rays are more penetrating than gamma rays
B) x-rays are electromagnetic radiations while gamma rays are negatively charged radiations
C) x-rays have higher frequencies than gamma rays
D) x-rays arise from energy changes in the electronic structure of atoms while gamma rays come from the nucleus.

22) A cell whose internal resistance is 0.5 ohms delivers a current of 4A to an external resistor. The lost voltage of the cell is
A) 1.250V
B) 2.000V
C) 8.000V
D) 0.125V

23) If the angle between two vectors P and Q is zero degrees, the vectors are said to
A) intersect at angle 45 degrees
B) intersect at angle 60 degrees
C) be parallel
D) be perpendicular.

24) A body of mass 4Kg is acted upon by a constant force of 12N for 3 seconds.The kinetic energy gained by the body at the end of the time is
A) 144J
B) 162J
C) 81J
D) 72J

25) A machine whose efficiency is 60% has a velocity ratio of 5. If a force of 500N is applied to lift a load P, what is the magnitude of P ?
A) 1500N
B) 500N
C) 4166N
D) 750N

esivue007:
are you sure that its gonna be suitable?

If you can use it effectively

Hardebaryor:
If you can use it effectively

pls those thar did change of institutions, have thé y been able to log in