UTME Past Questions
Physics · 2021
40 questions
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/ 40
Question 01
The law of conservation of energy is represented by
A
Lenz's law
B
Ampere's law
C
Coulomb's law
D
Faraday's law
Question 02
In the figure above, the value of R at balance point is
A
6.00
B
10.30
C
11.25
D
5.00
Question 03
The area under a force-distance curve is
A
Work
B
Impulse
C
Pressure
D
Momentum
Question 04
A charge of 30μC experiences a force of 60N at a certain point. The electric field intensity due to the charge is
A
5×10
4
NC
-1
B
2×10
4
NC
-1
C
5×10
6
NC
-1
D
2×10
6
NC
-1
Question 05
Dams are usually thicker at the bottom because
A
The water pressure exerted is strongest close to the ground
B
The water pressure is weakest close to the ground
C
Water has a greater pressure close to the ground
D
Water has a lesser pressure close to the ground
Question 06
Which of the following pairs gives vector quantities?
A
Momentum and power
B
Energy and impulse
C
Mass and mechanical advantage
D
Weight and momentum
Question 07
An equipment rated 1,500W with resistance 375Ω would draw a current of
A
77.5A
B
4A
C
0.1A
D
0.2A
Question 08
Which of the following gives a white colour when combined?
A
Red + magenta + green
B
Blue + red + cyan
C
Red + green + blue
D
Red + cyan + blue
Question 09
Which of these losses occur in a transformer? (i) Hysteresis loss (ii) Eddy current loss (iii) Stray load loss (iv) Mechanical loss
A
I and II only
B
I and III only
C
I, II, and IV only
D
I, II, and III
Question 10
What is the correct formula for the efficiency of a device?
A
Input / Output
B
Output / Losses
C
Losses / (Output + Losses)
D
1 - Losses / (Output + Losses)
Question 11
The inductance of a tuning circuit of an AM radio is 4mH. Find the capacitance of the circuit required for reception at 1,200kHz.
A
2.1 pF
B
4.4 pF
C
21.2 pF
D
27.6 pF
Question 12
Calculate the time required to electroplate a substance of area 300cm
2
with a layer of copper 0.6mm thick, if a steady current of 2A is maintained. [density of copper = 0.008kg/cm
3
; mass of copper liberated per coulomb = 3.3×10
-7
kg/C]
A
6.67hr
B
10.25hr
C
66.67hr
D
0.67hr
Question 13
Which of the following velocity-time graphs most suitably represents a solid ice puck pushed forward on a smooth horizontal surface?
A
Graph A
B
Graph B
C
Graph C
D
Graph D
Question 14
Which of these electrical instruments or machines does not rely on the magnetic effect of current for its working?
A
Carbon microphone
B
Telephone receiver
C
Moving-coil galvanometer
D
Dynamo
Question 15
A 50W heating coil is used for 2 minutes to heat a spherical metal ball of mass 0.5kg and specific heat capacity 1,000Jkg
-1
K
-1
. The temperature rise is
A
25°C
B
24°C
C
12°C
D
60°C
Question 16
A closed jar contains air at 1 atmosphere and 27°C. When the jar is heated to 127°C, what will the new pressure be?
A
1⅓ atm
B
3⅓ atm
C
⅓ atm
D
½ atm
Question 17
A wire A is half the length and half the diameter of a wire B of similar material. What is the ratio of the resistance of B to that of A?
A
8:1
B
1:2
C
2:1
D
1:4
Question 18
In any machine: (i) the velocity ratio is usually greater than the mechanical advantage (ii) the efficiency equals the ratio of mechanical advantage to velocity ratio (iii) the velocity ratio is independent of friction. Which of the statements above is/are correct?
A
i only
B
i and ii only
C
ii and iii only
D
i, ii and iii
Question 19
The accommodation of the eye is
A
Produced by movement of the retina
B
Due to change of size of the pupil
C
Produced by the action of the ciliary muscles
D
A result of unbalanced diet
Question 20
A ball of mass 500g is released from a cliff 20m above the ground and rebounds to a height of 5m. If the ball is in contact with the ground for 0.1s, calculate the force acting on the ball on impact with the ground.
A
50N
B
100N
C
150N
D
200N
Question 21
A vibrating string is plucked in the middle. The length of the string is unaltered and the tension is increased by 120N, then the new frequency becomes
A
1,600Hz
B
25Hz
C
200Hz
D
400Hz
Question 22
A parallel arrangement of 3Ω and 6Ω resistors is placed in series with an 8Ω resistor. If a potential difference of 30V is connected across the whole circuit, the current in the 3Ω resistor is
A
15A
B
10A
C
3A
D
2A
Question 23
A 60W and a 120W domestic lamp are used on the 240V mains. Which of the following statements is correct?
A
The filament of the 120W lamp has a higher resistance than that of the 60W lamp
B
The total current through the mains is 1 ampere
C
The potential difference across each lamp is 120V
D
The filament of the 60W lamp has a higher resistance than that of the 120W lamp
Question 24
A converging lens has a focal length of 20cm. The lens forms a real inverted image of the same size as the object. What is the distance of the object from the lens?
A
40cm
B
30cm
C
20cm
D
10cm
Question 25
X-rays are very useful for all of these EXCEPT
A
Treatment of cancer and detection of broken bones
B
Investigation of the structure of crystals
C
Detecting defects in metals
D
Determination of the estimated age of a specimen
Question 26
Caesium has a work function of 1.9eV. Calculate its threshold wavelength. [1eV = 1.6×10
-19
J, h = 6.6×10
-34
Js, c = 3×10
8
m/s]
A
3.5×10
-34
Js
B
6.5×10
-7
m
C
7.7×10
-7
m
D
8.6×10
-7
m
Question 27
The specific latent heat of steam is 2,300J/g and the specific heat capacity of water is 4.2J/gK. When 2g of steam at 100°C condenses to water at 40°C, the heat given up is
A
5,104J
B
4,936J
C
4,636J
D
4,684J
Question 28
When a gas is compressed at constant temperature, the gas molecules
A
Gain kinetic energy
B
Increase slightly in size
C
Move at the same speed so that the pressure is unchanged
D
Make more impacts per second on the walls of the container
Question 29
The note from a plucked guitar string will have a low pitch if the string is
A
Thin and short
B
Thick and long
C
Thick and slack
D
Thick and short
Question 30
The half-life of an element is 24 hours. What fraction of the atoms has disintegrated in 72 hours?
A
7/8
B
1/8
C
1/2
D
1/4
Question 31
Two equal masses placed 2m apart have a gravitational attraction of 6.7×10
-9
N. Compute the value of the masses. [G = 6.7×10
-11
Nm
2
/kg
2
]
A
20kg
B
30kg
C
40kg
D
50kg
Question 32
The potential at a point distance 0.03m from a small charge q is -1.0×10
5
V. What is the magnitude of q? [1/(4πε
0
) = 9×10
9
Nm
2
C
-2
]
A
-3.3×10
-7
N
B
-3.3×10
-7
C
C
1.1×10
-7
C
D
-1.1×10
-7
N
Question 33
The wave theory of light CANNOT be used to explain photoelectricity because
A
Light waves do not carry energy
B
There is a threshold wavelength for electron emission
C
The wavelength of light waves is too short
D
Particles cannot be emitted by waves
Question 34
Which of the following statements is true of stable equilibrium?
A
A boy walking on a tight rope
B
A balloon on a smooth horizontal table
C
A ball resting on an inverted hemispherical bowl
D
A ball in the middle of a hemispherical bowl
Question 35
Petrol produces a cooling effect because it has
A
Low conductivity
B
High conductivity
C
High latent heat of vaporization
D
Low latent heat of vaporization
Question 36
Which of the following observations cannot be explained using the rectilinear propagation of light?
A
Diffraction pattern of light
B
Formation of annular eclipse
C
Production of a real image
D
Production of image by a pinhole camera
Question 37
Neutrons are used to induce artificial radioactivity because they
A
Have no charge
B
Have no mass
C
Are more energetic
D
Are very ionizing
Question 38
Which of these methods cannot be used to reduce the surface tension of a liquid?
A
Addition of detergent or soap
B
Addition of oil
C
Addition of alcohol
D
Reducing the temperature of the liquid
Question 39
Question 39
A
B
C
D
Question 40
Question 40
A
B
C
D
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