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Physics
UTME / JAMB 2020
Current Electricity & Electric Circuits
A magnetic needle is suspended first at the earth's north magnetic pole and then at a point on the magnetic equator. The respective angles between the needle and the horizontal are
A
0\(^o\) and 0\(^o\)
B
60\(^o\) and 60\(^o\)
C
90\(^o\) and 90\(^o\)
D
90\(^o\) and 0\(^o\)
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 #56911)
Physics
UTME / JAMB 2020
Equilibrium of Forces, Moments & Flotation
A hydrometer is an instrument for measuring the
A
a depth of water of water in a vessel
B
relative density of a liquid by the method of flotation
C
relative density of a liquid by finding the apparent loss in weight
D
relative humidity of the air
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 #56912)
Physics
UTME / JAMB 2020
Current Electricity & Electric Circuits
Diagram
Solution
Consider the three forces acting at O and in equilibrium as shown in the figure. Which of the following equations is/are CORRECT?
I. P\(_1\) cos \(\theta_1\) = p\(_1\) cos \(\theta_2\)
II. P\(_3\) = P\(_1\) cos \(\theta_4\) + P\(_2 cos_2\)
III. P\(_1 \sin \theta_1 = P_2 \sin \theta_2\)
Attached Figure / Diagram
A
I only
B
II only
C
III only
D
I, II and III only
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
resolving \(P_1\), \(P_2\) and \(P_3\) into x and y component
\(P_x\) = \(P_1 Cos\theta_1\)
\(P_y\) = \(P_1Sin\theta_1\)
\(P_x\) = \(P_2Cos\theta_2\)
\(P_y\) = \(-P_2Sin \theta_2\)
\(P_x\) = \(- P_3Cos \theta0\)
therefore
total \(P_x\) = \(P_1 Cos\theta_1\) + \(P_2Cos \theta_2\) + \(- P_3Cos \theta0\) = 0
total \(P_y\) = \(P_1Sin\theta_1\) + \(-P_2Sin \theta_2\) = 0
so that \(P_1Sin\theta_1\) = \(P_2Sin \theta_2\)
\( P_3Cos \theta0\) = \(P_1 Cos\theta_1\) + \(P_2Cos \theta_2\)
Source: Myschool Past Questions Archive (Record #56913)
Physics
UTME / JAMB 2020
Reflection, Refraction & Dispersion of Light
Solution
The refractive index of a liquid is 1.5. If the velocity of light in vacuum is 3.0 x 10\(^8ms^{-1}\), the velocity of light in the liquid is
A
1.5 x 10\(^8ms^{-1}\)
B
2.0 x 10\(^8ms^{-1}\)
C
3.0 x 10\(^8ms^{-1}\)
D
4.5 x 10\(^8ms^{-1}\)
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
n = \(\frac{\text{speed in air}}{\text{speed in glass}}\)
1.5 = \(\frac{3 \times 10^4}{\text{speed in glass}}\)
Speed in glass = 3 x 10\(^8\)m/s / 1.5
= 2 x 10\(^8\)m/s
Source: Myschool Past Questions Archive (Record #56914)
Physics
UTME / JAMB 2020
Calorimetry, Latent Heat & Change of State
Solution
Heat is supplied uniformly at the rate of 100W to 1.0 x 10\(^{-2}\)kg of a liquid for 20 seconds. If the temperature of the liquid rises by 5\(^o\)C, then the specific heat capacity of the liquid is
A
2.0 x 10\(^2\)Jkg\(^-1\)K\(^-1\)
B
2.0 x 10\(^2\)Jkg\(^-1\)
C
4.0 x 10\(^4\)Jkg\(^-1\)K\(^-1\)
D
4.0 x 10\(^4\)Jkg\(^-1\)
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Heat energy = Electrical Energy
MC\(\theta\) = power x time
5 x 1 x 10\(^{-2}\) x C = 100 x 20
C = \(\frac{200}{5 \times 10^2}\)
= 4 x 10\(^4\) J/kg/\(^oC\)
Source: Myschool Past Questions Archive (Record #56920)
Physics
UTME / JAMB 2020
Work, Energy, Power & Simple Machines
Diagram
Solution
The fiqure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40\(^o\), then the value of W is
Attached Figure / Diagram
A
28.0N
B
48.0N
C
288.0N
D
50.0N
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
V.E = 6, load = 120N
Efficiency = M.A x \(\frac{1}{V.R}\) x 100%
40 = \(\frac{120}{effort}\) x \(\frac{1}{6}\) x \(\frac{100}{1}\)
Effort = 50N
Source: Myschool Past Questions Archive (Record #56922)
Physics
UTME / JAMB 2020
Calorimetry, Latent Heat & Change of State
Diagram
In an experiment in which molten naphthalene is allowed to cool, the cooling curve i n the figure was obtained. The temperature 80\(^o\)C is known as the
Attached Figure / Diagram
A
cooling temperature
B
boiling point
C
melting point
D
vaporization point
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 #56923)
Physics
UTME / JAMB 2020
Current Electricity & Electric Circuits
Diagram
Solution
In the figure, the value of R is
Attached Figure / Diagram
A
3\(\Omega\)
B
6\(\Omega\)
C
4\(\Omega\)
D
5\(\Omega\)
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
R\(_T\) = \(\frac{V}{1} = \frac{12}{2}\) = 6\(\Omega\)
R\(_T\) = 3 + \(\frac{R \times 6}{R + 6}\)
R = 6\(\Omega\)
Source: Myschool Past Questions Archive (Record #56924)
Physics
UTME / JAMB 2020
Current Electricity & Electric Circuits
Diagram
Solution
Which of the following instruments consumes the highest current?
I. Electric iron
II. Television set
III. Torchlight
IV. Immersion heater
250v
220v
6v
110v
1kW
110W
30W
500W
Attached Figure / Diagram
A
I
B
II
C
III
D
IV
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
(I) I = \(\frac{P}{V} = \frac{1000}{25}\) = 4A
(II) I = \(\frac{110}{220}\) = 0.5A
(III) I = \(\frac{30}{6}\) = 5A
(IV) I = \(\frac{500}{110}\) = 4.55A
Source: Myschool Past Questions Archive (Record #56925)
Physics
UTME / JAMB 2020
Waves, Sound & Vibrations
Diagram
In which of the following diagrams is the length of the tube equal to one wavelength?
Attached Figure / Diagram
A
a
B
b
C
c
D
d
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 #56926)
Physics
UTME / JAMB 2020
Atomic, Quantum, Nuclear Physics & Electronics
Solution
Which of the following pairs is part of the electromagnetic spectrum?
I. Radio waves
II. sound waves
III. Gamma rays
IV. water waves
A
I and II
B
III and IV
C
I and III
D
II and IV
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Examples of electromagnetic waves are radio waves, X-rays, gamma rays, light rays, etc
Source: Myschool Past Questions Archive (Record #56927)
Physics
UTME / JAMB 2020
Atomic, Quantum, Nuclear Physics & Electronics
Solution
A substance has half of 3 min. After 6 min, the count rate was observed to be 400. What was its count rate at zero time?
A
1600
B
1200
C
200
D
2400
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Let the count rate at zero time be N
N \(\frac{3 min}{\to}\) \(\frac{N}{2}\) \(\frac{3 min}{\to}\) \(\frac{N}{4}\)
\(\frac{N}{4}\)
= 400
N = \(\frac{400}{N/4}\) x N
= 1600
Source: Myschool Past Questions Archive (Record #56928)
Physics
WAEC / WASSCE 2020
Work, Energy, Power & Simple Machines
In collision between two objects, kinetic energy is conserved only if
A
one of the objects was initially at rest
B
potential energy is converted to work
C
the collision is inelastic
D
the collision is elastic
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 #59362)
Physics
WAEC / WASSCE 2020
Current Electricity & Electric Circuits
Solution
The quantity of motion of a body is its
A
acceleration
B
displacement
C
mometum
D
velocity
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Momentum is a physical quantity that describes the motion of an object. It is defined as the product of an object's mass and its velocity.
Unlike acceleration, displacement, and velocity, which describe different aspects of motion, momentum specifically quantifies the motion of a body.
Source: Myschool Past Questions Archive (Record #59363)
Physics
WAEC / WASSCE 2020
Gas Laws & Heat Transfer
The volume of a fixed mass of a gas varies inversely as the pressure on it provided the temperature is constant. This statement is
A
Pressure law
B
Charles law
C
Boyle's law
D
General gas law
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 #59364)