UNN Post UTME Past Questions for Physics (Original, PDF)

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Nature of UNN Post UTME Exam
UNN Post UTME Past Questions And Answers for Physics
UNN School Fees for Newly Admitted Students (All Courses)
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Nature of UNN Post UTME Exam

For each subject, there will be 17 questions to answer 15 questions. This means you will answer a total of 60 questions for the exam.
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UNN Post UTME Past Questions And Answers for Physics

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UNN POST UTME QUESTIONS FOR PHYSICS 2005/2006

Which of the following represents the correct precision if the length of a piece of wire is measured with a meter rule?
A. 35mm B.35.0mm
C. 35.00mm D.35.1mm
To keep a vehicle moving at a constant speed V requires power P, from the engine. The force provided by the engine is
A. P/V B.V/2 C. PV D.P/V²
Which of the following statements gives the TRUE difference between evaporation and boiling?
i. Evaporation occurs at all temperatures while boiling occurs at a fixed temperature for a given pressure.
ii. Evaporation is a surface phenomenon while boiling is an interior phenomenon
iii. Evaporation is affected by surface area while boiling is not

A. i and ii only
B. i and iii only
C. ii and iii only
D. i, ii and iii only
Equal masses of copper and rubber are raised to the same temperature. After sometimes, the copper was observed to be at a lower temperature because.
A. the specific heat capacity of copper is lower than that of rubber
B. copper expands more than rubber
C. the specific heat capacity of rubber is lower than that than of copper
D. rubber expands more than copper
Which of the following statements is correct about a long-sighted boy who does not put on glasses?
A. He cannot see distant objects clearly
B. Rays of light form a close object are focused in front of the retina
C. His eyeball is too long
D. Parallel rays of light are focused behind the retina
A 12V battery bas an internal resistance of 0.5 if a cable of 1.0 resistance is connected across the terminals of the battery the current drawn form the battery is
A.16.0A B. 8.0A C.0.8A D.0.4A
If two parallel wires carry currents flowing in the same direction, the conductors’ will
A. attract each other
B. repel each other
C. both move in the same direction
D. have no effect on each other
From the generating station to each substation, power is transmitted at a very high voltage so as to reduce
A. eddy current loss
B. hysteresis loss
C. heating in the coils
D. magnetic flux leakage
Two tuning forks of frequencies 256Hz and 260Hz are sounded close to each other. What is the frequency of the beats produced?
A. 516Hz B. 258Hz
C.4Hz D. 300Hz
The fundamental frequency of vibration of a sonometer wire way be halved by
A. doubling the length of the wire
B. doubling the mass of the wire
C. reducing the tension by half
D. reducing the absolute temperature by half
A transformer has a primary coil with 500 turns and a secondary coil with 2500 turns. When the voltage input to the primary is 120V, the output is
A. 6000V B. 600V C.240V D.60V
The principle of operation of an induction coil is based on
A. Ohm’s law B. Ampere’s law
C. Faraday’s law D. Coulomb’s law
4g of radioactive material of half-life 10days is spilled on a laboratory floor. How long would it take to disintegrate 3.5g of the material?
A. 11/4days B. 8 ¾ days C. 30 days D. 80 days
Which of the following statements correctly describe(s) cathode rays?
i. They consist of tiny particles carrying negative electric charges
ii. They are deflected in a magnetic field by not in neutrons and are deflected in an electric field.
iii. They consist of fast-moving neutrons and are deflected in an electric field

A. i only B. iii only C. i and ii only D. ii and iii only
Which of the following is most strongly deflected by a magnetic field?
A. y-rays B. X–rays C. β – particles

UNN POST UTME ANSWERS FOR PHYSICS 2005/06

1. The least count of a measuring device is the smallest measurement which the measuring device can be used to measure. It is otherwise referred to as reading accuracy.
For meter rule, the reading accuracy/precision =0.1cm = 1.0mm therefore, 35.0mm represents the correct precision of the measured length.
Ans. B

2. Speed = v, power = P, distance = S, force = F, time = t,
work done = W.P.
= W/t = (FXS)/t P
= F S/t
= F x v P = Fv
and F = P/v
Ans. A

3. Notice that statement (ii looks true but it’s not. While evaporation simply takes place at the surface of the liquid, boiling takes place in all parts of the liquid
Ans. B

4. Specific heat capacity is defined as the mount of heat that is necessary to raise the temperature of a unit mass of a substance through 1⁰C.
A body with low specific heat capacity can get heated quickly and can equally lose that heat quickly
Ans. A

5. A long-sighted person can see objects at a distance but cannot see close objects clearly. Long-sightedness is caused by the eyeball being too short or the eye lens not being sufficiently convergent so that rays form an object are brought to focus behind the retina. Ans. D

6. E =I (R+r)
12 = 1 (0.5 +1.0) =1.51
12 = 1.51,
1 =12/1.5 = 8A
Ans. B

7. Ampere’s law states that parallel wires attract each other when the currents in them flow in the same direction, but repel each other when the currents flow in opposite directions
Ans. C

8. From the generating station to each substation, power is transmitted t a very high voltage so as to reduce heating in the coils.
Ans. C

9. Frequency of beats = 256Hx +260Hz = 516Hz
Ans. A

10. For a sonometer, the relationship between f and I is an inversely proportional relationship; that is, it the length is double the frequency is halved, and if the octave (double frequency) is required the length is halved
Ans. A

11. P_T/S_T = P_v/S_v
500/2500 = 120/x
X = (120 x2500)/500
=600V
Ans. B

12. The principle of operation of an induction coil is based on faraday’s law
Ans. C

13. Amount remaining = 4 3.5 = 0.5g
After 10days, ½ x4g = 2g remains
After 20days, ½ x 2g = 1gremains
After 30days, ½ x 1g = 0.5g remains
Ans. C

14. Ans. C

15. Of all the options, -particles is most strongly deflected by a magnetic field because it is very light and negatively charged.
Ans. C

SUMMARY OF ANSWERS PHYSICS (2005/2006)
1. A 2.A 3.B 4.A 5.D 6.B 7.A 8.C 9.A 10.A 11.B 12.C 13.C 14.C 15.C

UNN POST UTME PAST QUESTIONS FOR PHYSICS 2006/2007

Indicate the correct option in each of the following questions

Which of the following is a set of vectors?
A. Force, mass and momentum
B. Acceleration, velocity and momentum
C. Mass, weight and density
D. Mass, volume and density
A catapult used to hold a stone of mass 500g is extended by 200cm with an applied force, F. It the stone leaves with a velocity of 40m/s, the value of F is
A. 4.0 x 10²N/M² B. 2.0 x 10³N C. 4.0 x 10³N D. 4.0 x 10⁴N
A parachute attains a terminal velocity when
A. It density is equal to the density of air
B. The viscous force of air and up thrust completely counteracts its weight
C. It expands as a result of reduced external pressure.
D. The viscous force of the air is equal to the sum of the weight and up thrust.
An electrical heater is used to melt a block of ice, mass 1.5g. If the heater is powered by a 12v battery, and a current of 20A flows through the coil, calculate the time taken to melt the block of ice at 0⁰C. (Specific latent heat of fusion of ice = 336x 10³ J/kg)
A. 76.0min B. 35.0min
C. 21.0min D. 2.0min
200g of water at 90⁰Cis mixed with same quantity of water at 30⁰C. Want is the final temperature?
A. 50⁰C C. 60⁰
B. 70⁰C D. 80⁰C
The equation P^x V^y T^z = constant is Charles law when
A. x =1, y=1, z=1, B. x=0, y=1, z=1
C. x= 1, y=0, z = -1 D. x=0, y=1, z=1
For a short-sighted person, light rays from a point on a very distant object is focused
A. in front of the retina
B. behind the retina
C. behind the retina by a diverging lens
D. in front of the retina a distance 2F from the lens.
Dispersion of light by a glass prism is due to the
A. different hidden colours of the glass
B. different speeds of various colours in glass
C. defect in the glass
D. high density in glass
To produce an enlarged and erect image with a concave mirror, the object must be poisoned
A. between the principal focus and the centre of curvature at the principal focus
B. between the principal focus and the pole
C. Beyond the centre of curvature
To convert an ac dynamo to dc dynamo, the
A. number of turns of the coil is increased
B. slip rings are replaced with a split-ring commutator
C. number of turns of the coil is reduced
D. split-rind commutator is replaced with slip rings.
In an Ac circuit that contains only a capacitor, the voltage
A. lags behind the current by 90⁰
B. leads the current by 90⁰
C. lags behinds the current by 180⁰
D. leads the current by 180⁰
The purpose of dielectric material in a parallel plate capacitor is to
A. increases the capacitance
B. decrease its capacitance
C. insulate the plates from each other
D. increase the magnetic field between plates
A substance has a half-life of 3min. after 6mins, the count rate was observed to be 600. What was its count rate at zero time?
A. 200 B. 1200
C. 1600 D. 2400
If light with photon energy 2eV is incident on the surface of a metal with work function 3eV, then
A. no electron will be emitted
B. the few electrons emitted will have maximum kinetic energy of 1eV
C. The few electrons emitted will have a maximum kinetic energy of 3eV
In a nuclear fusion experiment, the loss of mass amount to the amount of energy obtained from the fusion (speed of light = 3.0 x 10⁸m/s) is
A. 3.0 x10+J B. 3.0X 10⁴J
C. 9.0X10^-4 D. 9.0x 10¹⁰J

UNN POST UTME ANSWERS FOR PHYSICS 2006/2007

1. Vector quantities are quantities that have both magnitude and direction e.g. acceleration velocity, momentum, etc.
Ans. B

2. m= 500g = 0.5kg,
s =20 = 0.2m,
v= 40m/s
F = ma to obtain the value of, “a”,
we note that V² = 2as 40² = 2 x a x 0.2 = 0.4aa a= 40²/0.4 = 4000m/s² F= 0.5 x 4000 F = 2000 = 2 X 10³N
Ans. B.

3. A parachute attains a terminal velocity when t eh viscous force of the air and the up thrust completely counteract its weight
Ans. B

4. M = 1.5kg, V = 12V, 1 = 20A, t = c 336 x 10³J/Kg. Mc = V1tt= mc/IV = (1.5 x 336 x 10³) / (20 x12) t = 2100secs = (2100/60) mins, T= 35mins. Ans. B

5. Let the final temperature = T, 0, 90, 0₂ = 30⁰
M₁ (0₂T) = m₂c (T -0²)
But m₁ =m₂ = 200g
0₁ –T=T-0₂
T +T =0₁ +0₂
2T = 0₁+ 0₂
T = (0₁+ 0₂)/2
T = (90 +30)/2 = 120/2 =60
T = 60⁰C.
Ans. B

6. The equation P^x V^y T^{z =}constant is Charles law when x = O, Y, = 1, z =1

7. For a short-sighted person, light rays from a Point to a very distant object is focused in front of the retina
Ans. A

8. Dispersion of light by a glass prism is due to the different speeds that various colored rays move in glass. Each color in a ray of white light is the refracted in a slightly different direction on entering a glass prism
Ans. B

9. To produce an enlarged and erect-image with a concave mirror, the object must be positioned between the principal focus and the pole
Ans. B

10. To convert an a.c dynamo to d.c dynamo, the-slip rings are replaced with a split –ring commutator
Ans. B

11. The phase relationship of current and voltage for pure inductive and purely capacitive circuits are opposite.
A phrase that may help to remember the relationship is;
ELI the ICE man with E presenting voltage (for emf) and I representing current.
ELI indicates that with an inductance (L) the voltage leads the current by 90⁰.
Similarly ICE tells you that with a capacitance (C) the current leads the voltage by 90⁰. Ans. A

12 The purpose of dielectric material in parallel plate capacitors is to increase the capacitance of the capacitor. This means that the capacitance of a parallel plate capacitor depends on the nature of the dielectric material
Ans. A

13. Half-life of substance = 3mins, at 6mins, count rate = 600 at 3mins, count rate = 2 x 600 = 1200 at 0mins, count rate 1200 x 2 2400
Ans. D

14. If light with photon energy 2eV is incident on the surface of a metal with work function 3eV, no electron will be emitted. The law of photoelectric emission states that for electron to be emitted from the surface of a metal, the photon energy has to be equal to or greater than the work function.
Ans. A

15. Mass, m = 1.0x 10-6kg
speed of light, c = 3.0 x 10⁸m/s
Energy obtained, E = mc² E = 1.0×10^-6x (3.0x 10⁸)² =9.0 x 10¹⁰J
Ans. D

SUMMARY OF ANSWERS (PHYSICS 2006/2007)

1. A 2. B 3.B 4.A 5.B 6.B 7.A 8.B 9. C 10.B 11. A 12. A. 13. D 14. A 15. D

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