UTME Past Questions
Physics · 2025
40 questions
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/ 40
Question 01
A virtual image is formed by a convex lens when the object is placed …….
A
Between the lens and the focal points (F)
B
At the focal point (F)
C
Beyond the focal point (F)
D
At infinity
Question 02
A parallel plate capacitor has a capacitance of 10 uF . If the distance between the plates is halved, what will happen to the capacitance
A
It will double
B
Remain the same
C
It will be halved
D
It will quadruple
Question 03
The graphics representation of pressure law is always a straight line passing through the origin only if the temperature scale is
A
Rankine
B
Thermodynamic (kelvin)
C
Celsius
D
Fahrenheit
Question 04
The density of water is 1 g/cm
3
, while the density of ice is 0.9 g/cm
3
. Calculate the change in volume when 90 g of ice is completely melted
A
10cm
3
,
B
0cm
3
,
C
900cm
3
,
D
9cm
3
,
Question 05
5. A man moves 6.0 m East and then 10.0 m in the direction N300E. How far is he from his starting point
A
12.0m
B
17.0m
C
15.0m
D
14.0m
Question 06
6. A boy uses a single pulley system to lift a mass of 29 kg, moving at a constant velocity of 5 m/s. what is the power developed by the boy? (Take g = 10m/s
2
)
A
40w
B
100w
C
250w
D
1450w
Question 07
Which of the following is not true about a wave in a plucked string
A
It has a crest
B
It is transverse
C
It is longitudinal
D
It is mechanical
Question 08
8. The speed of sound in a solid at 0
0
c is 1000m/s. What is its speed at 25
0
c
A
1043/m/s
B
1044m/s
C
1045m/s
D
1042m/s
Question 09
9. Photoelectrons are emitted with a maximum kinetic energy of 2.20x 10
-19
from a metal surface when light is the stopping potential required to prevent these electrons from reaching the anode? (lev = 1.6x 10
19
J)
A
1.60V
B
1.50V
C
1.40V
D
1.55V
Question 10
According to the kinetic of gases, the pressure exerted by a gas on the wall equals
A
momentum imparted to the wall per second per unit area
B
Change in momentum per unit volume
C
Rate of change of momentum imparted to the wall second per unit area
D
Change in momentum imparted to the per unit area
Question 11
Which of the following statements about floatation is not correct
A
An object floats because the upthrust experienced by the object equals the weight of the object
B
A floating object displaces its own weight of liquid
C
An object floats when its density is less than that of the liquid
D
An object floats because the weight of the fluid is more than that of the object
Question 12
12. How long does it take a 750 w water heater to raise the temperature of 1 kg of water from 20
0
C to 50
0
C (specific heat capacity of water = 4200jkg
-1
k
-1
A
84s
B
112s
C
168s
D
28s
Question 13
13. Which electromagnetic wave is most suitable for satellite communication due to its ability to penetrate the Earth’s atmosphere with minimal absorption?
A
Gamma rays
B
Microwaves
C
Ultraviolet rays
D
Infrared rays
Question 14
Which factor does not affect the vapour pressure of a liquid?
A
Nature of the liquid
B
Surface area exposed
C
Temperature
D
Intermolecular forces
Question 15
The rate of heart transfer by radiation is most affected by:
A
Mass of the object
B
Colour and surface texture
C
Thermal conductivity
D
Volume of the material
Question 16
A steel bridge is 100 m long at 15
0
C What structural feature is most appropriate to accommodate thermal expansion during hot seasons?
A
Use of thinner beams
B
Painting the surface white
C
Use of expansion joints
D
Using insulating materials
Question 17
17. A block of mass 5 kg slides down a rough incline of 45
0
. If it moves with constant velocity, find the coefficient of friction between the block and the plane. (Take g = 9.8 m/s
2
)
A
1.0
B
0.87
C
0.71
D
0.5
Question 18
Which of the following change would raise the center of gravity of a vehicle the most?
A
Removing the engine
B
Adding mass to the roof
C
Flattening the tires
D
Reducing the wheelbase
Question 19
The barometric height in a mercury barometric is 760 mm. if the same pressure is to be measured using water, column? (Density of mercury = 13,600 kg/m
3
A
7.6m
B
10.3m
C
13.6m
D
1.0m
Question 20
The fundamental difference between a thermocouple and a mercury-in-glass thermometer is that:
A
the thermocouple measure only very low temperatures
B
the mercury thermometer is not calibrated
C
the thermocouple uses expansion of metal
D
the thermocouple uses thermoelectric effect to measure temperature
Question 21
21. Which of the following thermometers is most suitable for measuring rapid changes in temperature?
A
Mercury-in-grass thermometers
B
Constant volume gas thermometers
C
Resis-volume gas thermometer
D
Thermocouple
Question 22
200 g of ice at 0
0
c is added to 500g of water at 60
0
C in an insulated container. Assuming no heat loss, what is the final latent heat of fusion of ice = 336,000 j/kg
0
C)
A
0
0
C
B
10
0
C
C
20
0
C
D
30
0
C
Question 23
A. 1000w heart is used to convert ice at -10
0
C to steam at 100
0
C. how long will it take to convert 0.5 kg of ice =336,000 j/kg; specific heart capacity of water = 4,200 j/kg
0
C, Latent heart of vaporization = 2.260
6
j/kg
A
1.790s
B
1.980s
C
2.220s
D
2.400
Question 24
Which of the following explains why the boiling point of a liquid increases with pressure?
A
The molecules need less kinetic energy to escape
B
The density of the liquid increases
C
The molecules require more energy to overcome atmosphere pressure
D
The specific latent heart increases with pressure
Question 25
A student notices that a tuning fork vibrating at 512 Hz produces resonance in a tube closed at one end. If the speed of sound is 340 m/s, what is the shortest possible length of the tube for resonance to occur?
A
0.08m
B
0.17m
C
0.33
D
0.66
Question 26
A progressive wave is given as y = 0.1sin (400πt-20π×). What is the phase difference between two points that are 0.05 m apart?
A
π/2 radians
B
π radians
C
2π radians
D
3π radians
Question 27
Which of the following pairs of wave properties are responsible for the pitch and loudness of a sound respectively?
A
Frequency and amplitude
B
Wavelength and velocity
C
Amplitude and wavelength
D
Frequency and velocity
Question 28
28. In the photoelectric effect, which of the following factors does not affect the kinetic energy of the emitted electrons?
A
Frequency of the incident light
B
Work function of the material
C
Intensity of the incident light
D
Planck’s constant
Question 29
A ray of light travels from air into water at an angles. Which statement about its speed and direction is correct?
A
It speed up and bends to toward the normal
B
It slow down and bends toward the normal
C
It slows down and bends away from the normal
D
It speeds up and bends away from the normal
Question 30
Which of the following best explains why a red object appears black under green light? A. Red objects reflect green light?
A
Red objects reflects reflect green light
B
Red objects
C
Green light is brighter than red light
D
Red and green light cancel each other out
Question 31
A cell of EMF 6V and internal resistance 1Ω is connected in series with a 3Ω resistor. If another identical cell is connected in parallel with the first, what is the total current flowing in the circuit?
A
1.0A
B
1.2A
C
1.5A
D
2.0A
Question 32
Two long parallel wires carry equal currents in opposite directions. The magnetic field at a point midway between the wires will:
A
be zero
B
be directed perpendicular to the plane containing the wires
C
be equal to the sum of the fields due to each wire
D
Difference between real and apparent depth
Question 33
Why is soft iron preferred as the core of an electromagnet?
A
It is a good conductor of electricity
B
It is retains magnetism permanently
C
It is easily magnetized and demagnetized
D
It is has a high resistance to magnetic reversal
Question 34
34. A coil is rotated in a uniform magnetic field. Which of the following increases the maximum induced EMF in the coil?
A
Decreasing the number of turns
B
Increases the speed of rotation
C
Rotating the coil slower
D
Using thinner wire
Question 35
What causes eddy currents in a conductor?
A
Rapid mechanical/rotation of the conductor
B
Heating of the conductor by resistance
C
A changing magnetic field cutting across the conductor
D
The alignment of atomic dipoles within the material
Question 36
The energy released in a nuclear reaction is related to the mass defect by the equation E = ∆mc
2
. What is the energy equivalent of a mass defect of 5×10
-4
kg? (Use c = 3×10
8
m/s).
A
4.5×10
10
J
B
4.5×10
13
J
C
3.0×10
13
J
D
9.0×10
13
J
Question 37
A sample initially contains 2.4× 10
20
radioactive atoms with a half-life of 1 hour. How many atoms will remain undecayed after 3 hours?
A
3.0×10
19
B
4.8x10
19
C
6.0x10
19
D
1.2x10
19
Question 38
In a semiconductor, the band gap is the energy difference between:
A
Valence band and core level
B
Conduction band and nucleus
C
Conduction band and valence band
D
Valence band and Fermi level
Question 39
In a P-N junction diode, the depletion region widens when:
A
Forward biased
B
Revers biased
C
The diode is hearted
D
The diode is illuminated by light
Question 40
Which device can be used as a switch and amplifier and consists of three layers of semiconductor material?
A
Zener diode
B
Transistor
C
Photodiode
D
Light Emitting Diode (LED)
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