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Physics
UTME / JAMB 2020
Atomic, Quantum, Nuclear Physics & Electronics
Natural radioactivity consists of emission?
A
\(\alpha\)-particles and \(\beta\)-rays
B
\(\alpha\)-particles and X-rays
C
\(\gamma\)-ray and X-rays
D
\(\alpha\)-particles and \(\beta\)-rays and \(\gamma\)-rays
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #56900)
Physics
UTME / JAMB 2020
Current Electricity & Electric Circuits
Which of the following can be described as high tension transmission?
A
High resistance and low voltage
B
Low current and high voltage
C
High current and low voltage
D
High current and low resistance
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #56902)
Physics
UTME / JAMB 2020
Current Electricity & Electric Circuits
Solution
What is the cost of running five 50W lamps and four 100W lamps for 10 hours if electrical energy costs 2 Kobo per KWh?
A
N0.65
B
N0.39
C
N3.90
D
N0.13
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
POWER = energy consumed/time
Energy consumed = power x time
energy consumed = \(\frac{(5 \times 50) + (4 \times 100) \times10}{1000}\)
= 6.5KWh.
but 1KWh = 2kobo
then 6.5KWh = 6.5 x 2 = 13kobo →#0.13
Source: Myschool Past Questions Archive (Record #56903)
Physics
UTME / JAMB 2020
Atomic, Quantum, Nuclear Physics & Electronics
Tha mass of a proton is approximately equal to that of
A
an \(\alpha\)-particle
B
a \(\beta\)-Particle
C
a neutron
D
an electron
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #56904)
Physics
UTME / JAMB 2020
Magnetism, Electromagnetism & AC Circuits
Solution
A transformer has 300 turns of wire in the primary coil and 30 turns in the secondary coil. If the input voltage is 100 volts, the output voltage is
A
5 volts
B
10 volts
C
15 volts
D
20 volts
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
For transformation, Es = e.m.f. of secondary coil
Ep = Np
Np = e.m.f. of secondary coil
Ns = number of turns in secondary coil
Ns = number of turns in primary coil
\(\frac{30}{300}\) = \(\frac{x}{100}\) = 300
X = 3000
X = 10 volts
Source: Myschool Past Questions Archive (Record #56905)
Physics
UTME / JAMB 2020
Equilibrium of Forces, Moments & Flotation
Solution
A solid weighs 4.8g in air, 2.8g in water and 3.2g in Kerosine. The ratio of density of the solid to that of the kerosine is
A
2
B
\(\frac{3}{2}\)
C
\(\frac{2}{3}\)
D
3
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Relative density of solid
\(\frac{\text{weight of solid}}{\text{weight of an equal volume of water}}\)
= \(\frac{4.8}{4.8 - 2.8}\)
= \(\frac{4.8}{2}\) = 2.4
Relative density of liquid
= \(\frac{\text{Weight of liquid kerosine}}{\text{Weight of an equal volume of water}}\)
= \(\frac{4.8 - 3.2}{4.8 - 2.8}\) = \(\frac{1.6}{2}\) = 0.8
= \(\frac{\text{Ratio of relative density of solid}}{\text{Relative density of Kerosine}}\)
= \(\frac{\text{density of solid}}{\text{density of Kerosine}}\)
= \(\frac{2.4}{0.8}\)
= 3
Source: Myschool Past Questions Archive (Record #56906)
Physics
UTME / JAMB 2020
Units, Measurements & Dimensional Analysis
Solution
One of the following readings represents the measurement of the length of a metal rod using vernier callipers. Taking the reading accuracy into consideration, the most likely one is
A
5.16cm
B
5.165cm
C
5.0cm
D
5.160cm
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Vernier Calipers Accuracy: Vernier calipers usually measure with an accuracy of 0.01 cm (0.1 mm), allowing for readings with two decimal places to ensure precision.
Hence, 5.16cm
Source: Myschool Past Questions Archive (Record #56907)
Physics
UTME / JAMB 2020
Waves, Sound & Vibrations
When a sound wave passes from air into water its
A
speed and frequency increases but its wavelength remains the same
B
speed and wavelength increases but its frequency remains the same
C
speed decreases
D
speed increases but its frequency and wavelength decreases
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #56908)
Physics
UTME / JAMB 2020
Reflection, Refraction & Dispersion of Light
A convex mirror is used as a driving mirror because
I. its image is erect
II. It has a large field of view
III. It has a long focal length
Identify the CORRECT statement(s)
A
I and III only
B
I and II only
C
II and IIII only
D
I, II and III only
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #56909)
Physics
UTME / JAMB 2020
Waves, Sound & Vibrations
Solution
A ship travelling towards a cliff receives the echo of its whistle after 3.5 seconds. A short while later, it receives the echo after 2.5 seconds. If the speed of sound in air under the prevalling condition is 250ms -1, how much closer is the ship to the cliff?
A
10m
B
350m
C
175m
D
125m
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Difference in time = 1 sec
echo time = 1 \(\div\) 2 = 0.5 sec
Difference of cliff from ship = 0.5 x 250
= 125m
Source: Myschool Past Questions Archive (Record #56915)
Physics
UTME / JAMB 2020
Lenses & Optical Instruments
Solution
Which of the following statements about defects of vision is/are CORRECT?
I. For a long sighted person, close objects appear blurred
II. For a short sighted person, distant objects appear blurred
III. Short sight is corrected by using a pair of converging lenses
A
I only
B
II only
C
I and II only
D
II and III only
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Statements I & II are correct
Statement III is incorrect because short sightedness is corrected by using suitable concave or diverging lens
Hence; option C is the correct option
Source: Myschool Past Questions Archive (Record #56916)
Physics
UTME / JAMB 2020
Reflection, Refraction & Dispersion of Light
Solution
Which of the following conditions are necessary and sufficient for total internal reflection to take place at the boundary between two optical media?
I. Light is passing from optical denser medium to optically less dense medium
II. Light is passing from optically less dense medium to optically denser medium
III. Angle of incidence is greater than a certain critical value
IV. Angle of incidence is lesser than a certain critical value
A
I and II only
B
II only III only
C
III and IV only
D
I and III only
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The conditions for total internal reflection include light traveling from an optically denser medium (higher refractive index) to an optically less dense medium (lower refractive index) and that the angle of incidence is greater than the critical angle.
Source: Myschool Past Questions Archive (Record #56917)
Physics
UTME / JAMB 2020
Temperature, Thermometry & Thermal Expansion
Solution
The linear expansivity of brass is 2 x 10\(^{-5}\) \(^oC^{-1}\). If the volume of piece of brass is 10cm\(^3\) at 0\(^o\)C. What will be its volume at 100\(^o\)C?
A
10.06cm\(^3\)
B
10.04 cm\(^3\)
C
10.02 cm\(^3\)
D
10.20 cm\(^3\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
3 x \(\alpha\) = \(\frac{V_2 - V_1}{V_1 \times \Delta \theta}\)
3 x 2 x 10\(^{-5}\) = \(\frac{V_2 - 10}{100 \times 10}\)
V\(_2\) = (100 x 10 x 3 x 2 10\(^{-2}\)) + 10
= 10.06 cm\(^3\)
Source: Myschool Past Questions Archive (Record #56918)
Physics
UTME / JAMB 2020
Temperature, Thermometry & Thermal Expansion
Solution
The lower and upper fixed points marked on a Mercury-in-glass thermometer are 210mm apart. The end of the mercury column in the tube is 49mm above the lower fixed point in a room. What is the temperature of the room in degrees Celsius?
A
55.3\(^o\)C
B
23.3\(^o\)C
C
49.0\(^o\)C
D
16.43\(^o\)C
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\frac{49 - 0}{210 - 0}\) = \(\frac{\theta - 0}{100 - \theta}\)
\(\frac{49}{210} = \frac{\theta}{100}\)
49 x 100 = 210 x \(\theta\)
\(\theta = \frac{4900}{210}\) = 23.3\(^o\)
Source: Myschool Past Questions Archive (Record #56919)
Physics
UTME / JAMB 2020
Current Electricity & Electric Circuits
Diagram
Solution
Two mirrors of the same length are arranges as show in the diagram. A ray of light NO strikes the system at O and emerges along PQ. The emergent ray has been deviated through
Attached Figure / Diagram
A
220\(^o\)
B
200\(^o\)
C
210\(^o\)
D
180\(^o\)
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Deviation angle
= \(\theta_1 + \theta_2\) = 50 + 50 + 40 + 40
= 180\(^o\)
Source: Myschool Past Questions Archive (Record #56910)