₦airaland Forum

Eben331:
(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:
The correct answers are marked with *

Aceed:
An object 0.04m high is placed in front
of and at right angles to the axis of a
concave mirror which has radius of
curvature 0.15m. If a real image 0.12m
high is obtained, determine by scale
drawing or otherwise,
1. the distance of the object from the
mirror
2. how far, and in what direction, must
the object be moved in order to obtain
a virtual image 0.12m high.


An optician uses a plane mirror to help
him. Suppose a patient sits in a chair
2.5m away from him. He views the image
of a chart which faces the mirror and
is located 30cm behind him. How far away
is the chart as viewed from his eyes?


When a resistance R is across a cell, the voltage
across the terminals of the cell is reduced to
two-thirds of its nominal value. The internal
resistance of the cell is?

A cell of internal resistance 2ohms supplies
current to a 6ohms resistor. The efficiency
of the cell is?

A cell of e.m.f 1.5V and internal resistance 2.5ohm
is connected in series with an ammeter of resistance
0.5ohm and a resistor of resistance 7.0ohm. Calculate
the current in the circuit.

The internal resistance of each cell, E1 and E2, connected
in parallel is 2ohms to an ammeter A and a resistor of 4ohms.
Calculate the total current in the circuit.

A work of 3ojoules is done in transferring 5 milliCoulombs
of charge from point B to a point A in an electric field.
The potential difference between B and A is?

The plates of a parallel plate capacitor, 5x10^-3m apart
are maintained at a potential difference of 5x10^4V.
Calculate the magnitude of the
(i) electric field intensity between the plates.
(ii) force on the electron
(iii)acceleration of the electron
(electronic charge = 1.6x10^-19C, mass of electron = 9.1x10^-31kg)


What is the potential energy between two protons of charge q
and at a distance of r apart? (Permittivity of free space = e(knot))


Find the net capacitance of two capacitors 2F and 3F in series connected
in series to two capacitors 3F and 3F in parallel.


cc Eben331, Damayogenius18, Nltaliban, DrBestJC

DrBESTJC:
Thanks for this......really helpful.......more of it please..

Eben331:
(1) The tendon in a mass leg is 10cm long and 1cm in diameter. How much will it be stretched by a force of 157N if the Young Modulus for the tendon is 2*10^8N/m^2 (2) A steel bar of length 4m and of rectangular section 1cm by 2cm supports a load of 10kg. By how much is the bar stretched? take Young Modulus=2*10^11N/m^2 (3) A metal rod of diameter 7mm, length 100mm is made from steel of Young Modulus 2*10^11N/m^2. Calculate the force constant of the rod. PLS SHOW YOUR WORKINGS!!

Mirabel2032:
pls those thar did change of institutions, have thé y been able to log in

Eben331:
@Orezy5. Thanks but I will prefer you typing the answers out because i am using a 'small' phone. I'm sorry for any inconvenience this may give you.

Eben331:
(1) The tendon in a mass leg is 10cm long
and 1cm in diameter. How much will it
be stretched by a force of 157N if the
Young Modulus for the tendon is 2*10^8N/m^2

(2) A steel bar of length 4m and of
rectangular section 1cm by 2cm supports a
load of 10kg. By how much is the bar
stretched? take Young Modulus=2*10^11N/m^2

(3) A metal rod of diameter 7mm,
length 100mm is made from steel of Young
Modulus 2*10^11N/m^2. Calculate the force
constant of the rod.

Nltaliban:
Why did you add more questions?

Because they are not too hard for the Taliban


me still dey wait the remaining ooo

Aceed:
Because they are not too hard for the Taliban


me still dey wait the remaining ooo

Nltaliban:
I'll try. You people should not tag me with physics questions again. I'm not good at physics and no longer do physics as a course here in ui

Abeg no vex....exam dey door and aspirants here don't answer questions as quick as before or maybe as quick as I expected I con say make I tag una


you try sef ajet, Isiss dem no even answer but I understand they are in a very demanding department...

What course do you study?

Nltaliban:
I'll try. You people should not tag me with physics questions again. I'm not good at physics and no longer do physics as a course here in ui

Obamahmud:
Pls! I want to study industrial chemistry,my jamb score is 213 and my subject combination is bio,chem,phy,eng.Am I good to go?

Aceed:
Abeg no vex....exam dey door and aspirants here don't answer questions as quick as before or maybe as quick as I expected I con say make I tag una


you try sef ajet, Isiss dem no even answer but I understand they are in a very demanding department...

What course do you study?

Eben331:
But your residual knowledge on Physics will still be useful to us here. You can still assist us in solving some questions you still know.

Eben331:
You also use post more questions frequently bro. You should endeavour to also show corrections to them and workings if possible, to help one another on this thread.

DrBESTJC:
The correct answers are marked with *

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

Aceed:
Abeg no vex....exam dey door and aspirants here don't answer questions as quick as before or maybe as quick as I expected I con say make I tag una


you try sef ajet, Isiss dem no even answer but I understand they are in a very demanding department...

What course do you study?

BiafranDel:
A given amount of gas occupies 10dm*3(10dm cube) at 4 atm and 273degree celsius. The number of moles of the gas present is [molar volume of a gas at stp is 22.4dm*3]

A0.89mole B1.90mole C3.80mole D5.70mole

BiafranDel:
The pressure of a gas which occupies a volume of 500cm3 at temperature 27degree celsius is 900mmhg. what is the pressure of the gas at a temperature of minus -48degree*C if the volume is reduced to 250cm3.

A500mmhg B750mmhg C1350mmhg D400mmhg