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Physics
UTME / JAMB 2020
Thermal Physics
Solution
A few grains of table salt were put in a cup of cold water, kept at constant temperature and left undistributed. Eventually all the water tested salty. This action is due to?
A
convection
B
osmosis
C
capillarity
D
diffusion
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Diffusion is the tendency of molecules to migrate and fill an empty space due to their random thermal motions.
in diffusion, the diffusing molecules move from the places where their concentration high to places where their concentration is low.
Source: Myschool Past Questions Archive (Record #56890)
Physics
UTME / JAMB 2020
Mechanics and Properties of Matter
Solution
The force required to make an object of mass m, travelling with velocity v, turn in a circle of radius r is
A
\(\frac{mv^2}{r}\)
B
\(\frac{mr^2}{x}\)
C
\(\frac{mr}{v}\)
D
\(\frac{mv}{r^2}\)
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The force required to make an object of mass \( m \), traveling with velocity \( v \), turn in a circle of radius \( r \) is known as the \textbf{centripetal force}. The formula for centripetal force \( F_c \) is given by: \(F_c = \frac{mv^2}{r}\)
where:\( m \) = mass of the object, \( v \) = velocity of the object, \( r \) = radius of the circular path.
Source: Myschool Past Questions Archive (Record #56891)
Physics
UTME / JAMB 2020
Mechanics and Properties of Matter
Solution
A machine gun with a mass of 5kg fires a 50g bullet at a speed of 100 ms\(^{-1}\). The recoil speed of the machine gun is
A
0.5 ms\(^{-1}\)
B
1.5 ms\(^{-1}\)
C
1 ms\(^{-1}\)
D
2ms\(^-1\)
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Gun Momentum = bullet momentum
M\(_a\)V\(_a\) = M\(_b\)V\(_b\)
5 x V\(_a\) = 0.05 x 100
V\(_a\) = 1m\(^{-1}\)
Source: Myschool Past Questions Archive (Record #56892)
Physics
UTME / JAMB 2020
Heat Energy & Temperature
Solution
If in a simple pendulum experiment the length of the inextensible string is increased by a factor of four, its period is increased by a factor of?
A
4
B
\(\frac{\pi}{2}\)
C
\(\frac{1}{4}\)
D
2
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
In a simple pendulum, T = 2\(\pi\)\(\sqrt{\frac{L}{g}}\)
\(\frac{T_1}{T_2} = \sqrt{\frac{L_1}{L_2}}\) but L\(_2\) = 4L\(_1\)
\(\frac{T_1}{T_2} = \sqrt{\frac{L_1}{4L_1}}\)
T\(_2\) = 2T\(_1\)
Source: Myschool Past Questions Archive (Record #56893)
Physics
UTME / JAMB 2020
Thermal Physics
In what range of temperature is the expansion of water anomalous?
A
+208\(^o\)C to +212\(^o\)C
B
-80\(^o\)C + -76\(^o\)C
C
0\(^o\)C to +4\(^o\)C
D
-4\(^o\)C to +0\(^o\)C
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 #56894)
Physics
UTME / JAMB 2020
Electricity and Magnetism
Which of the following statements about radioactivity is true?
(i) Alpha particle is positively charged
(ii) Beta particle is negatively charged
(iii) Gamma ray is neutral
(iv) Beta particle has the same mass as helium atom
(v) Gamma ray is charged.
A
i, ii, iii, iv only
B
i, ii, iii only
C
iv and v only
D
i, ii and v 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 #56895)
Physics
UTME / JAMB 2020
Thermal Physics
Solution
In the study of Physics, temperature and heat are often confused with each other. Which of the following statements correctly defines these two elements?
A
Temperature is a measure of the average kinetic energy of the molecules of a substance
B
Heat is a measure of the total kinetic energy of the molecules in a system
C
Different materials require different amounts of heat to cause a given change in temperature
D
All of the above
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Option D is correct.
Source: Myschool Past Questions Archive (Record #56896)
Physics
UTME / JAMB 2020
Electricity and Magnetism
Diagram
Solution
The effect of closing the key K in the circuit shown in the figure above would be to?
Attached Figure / Diagram
A
increase the current by 0.4A
B
reduce the current by 0.4A
C
increase the current by 0.6A
D
reduce the current by 0.6A
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
When K is open. Total Resistance = 8 + 2 = 10\(\Omega\)
1 = \(\frac{V}{\Omega}\) = \(\frac{6v}{\Omega}\) = 0.6A
Where K is closed, \(\frac{1}{8} + \frac{1}{8} = \frac{1}{\Omega}\)
\(\frac{2}{8} = \frac{1}{\Omega}\)
\(\Omega\) = \(\frac{8}{2}\) = 4\(\Omega\)
\(\Omega\) = \(\frac{8}{2}\) = 4\(\Omega\)
4\(\Omega\) in series with 2\(\Omega\)= 6\(\Omega\)
1 = \(\frac{V}{\Omega}\) = \(\frac{6}{6}\) = 1A
1 - 0.6A = 0.4A increase
Source: Myschool Past Questions Archive (Record #56897)
Physics
UTME / JAMB 2020
Modern Physics and Nuclear Physics
Which of the following statements on the use of X-rays is incorrect? X-rays are used
A
In a hospital to obtain photographs of tissues and bones in the body
B
For the treatment of malignant growths like cancer cells
C
In detecting fingerprints
D
To reveal hidden flaws in metal castings and welded joints work of art
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 #56898)
Physics
UTME / JAMB 2020
Heat Energy & Temperature
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
Heat Energy & Temperature
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
Mechanics and Properties of Matter
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
Heat Energy & Temperature
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
Electricity and Magnetism
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
Mechanics and Properties of Matter
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)