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Physics
UTME / JAMB 2018
Reflection, Refraction & Dispersion of Light
Which of the following may be used to explain a mirage?
I. Layers of air near the road surface have varying refractive indices in hot weather
II. Road surfaces sometimes becomes invisible in hot weather
III. Light from the sky can be refracted upwards after coming close to the road surface.
A
I and III only
B
II and III only
C
II only
D
I, II and III
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #47394)
Physics
UTME / JAMB 2018
Elasticity, Density, Pressure & Fluids
Diagram
In the diagram given if the atmospheric pressure is 760mm, the pressure in the chamber G Is
Attached Figure / Diagram
A
660mm
B
830mm
C
690mm
D
860mm
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 #47395)
Physics
UTME / JAMB 2018
Atomic, Quantum, Nuclear Physics & Electronics
If the fraction of the atoms of a radioactive material left after 120years is \(\frac{1}{64}\), what is the half-life of the material? \(\frac{1}{64}\)
A
20 years
B
10 years
C
2 years
D
24 years
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #47402)
Physics
UTME / JAMB 2018
Circular Motion, Gravitation & Simple Harmonic Motion
Diagram
In the diagram shown, which of the simple pendulum will resonate with P when set into oscillation?
Attached Figure / Diagram
A
U
B
T
C
R and T
D
Q and R
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 #47403)
Physics
UTME / JAMB 2018
Current Electricity & Electric Circuits
The time rate of loss of heat by a body is proportional to the
A
temperature of its surroundings
B
temperature of the body
C
difference in temperature between the body and its surroundings
D
ratio of the temperature of the body to that of its surroundings
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 #47404)
Physics
UTME / JAMB 2018
Current Electricity & Electric Circuits
Solution
A positively charged rod X is brought near an uncharged metal sphere Y and is then touched by a finger with X still in place. When the finger is removed, the result is that Y has
A
no charge and a zero potential
B
a positive charge and a zero potential
C
a negative charge and a positive potential
D
a negative charge and a negative potential
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
When a positively charged rod X is brought near an uncharged metal sphere Y, it induces a separation of charges. The side of the sphere near the rod becomes negatively charged as electrons are attracted to it, while the far side becomes positively charged.
When the finger touches the sphere, electrons can flow from the finger into the sphere, giving it an excess of electrons. After removing the finger and the rod, the sphere retains a negative charge.
Source: Myschool Past Questions Archive (Record #47405)
Physics
UTME / JAMB 2018
Current Electricity & Electric Circuits
Solution
Electrical appliances in homes are normally earthed so that
A
a person touching the appliances is safe from electric shock
B
both the a.c. and d.c. sources can be used
C
the appliances are maintained at a higher pd than the earth
D
the appliances are maintained at a lower pd than the earth
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Earthing keeps the metal body of an appliance at earth potential (0 V). If a live wire touches the casing, current flows to the ground, preventing electric shock.
Source: Myschool Past Questions Archive (Record #47406)
Physics
UTME / JAMB 2018
Calorimetry, Latent Heat & Change of State
The process whereby a liquid turns spontaneously into vapour is called
A
regelation
B
evaporation
C
boiling
D
sublimation
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 #47407)
Physics
UTME / JAMB 2018
Current Electricity & Electric Circuits
The differences observed in solids, liquids and gases may be accounted for by
A
their relative masses
B
their melting points
C
the spacing and forces acting between the molecules
D
the different molecules in each of them
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 #47408)
Physics
UTME / JAMB 2018
Reflection, Refraction & Dispersion of Light
Convex mirrors are used as driving mirrors because images formed are
A
erect, Virtual and diminished
B
erect, real and diminished
C
erect, virtual and magnified
D
inverted, virtual and diminished
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #47429)
Physics
UTME / JAMB 2018
Current Electricity & Electric Circuits
Solution
Musical instruments playing the same note can be distinguished from one another owing to the difference in their
A
quality
B
pitch
C
intensity
D
loudness
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
. Sound "quality" or "timbre" describes those characteristics of sound which allow the ear to distinguish sounds which have the same pitch and loudness.
Source: Myschool Past Questions Archive (Record #47430)
Physics
UTME / JAMB 2018
Units, Measurements & Dimensional Analysis
Solution
The inner diameter of a small test tube can be measured accurately using a
A
Micrometres screw gauge
B
Pair of dividers
C
Metre rule
D
Pair of vernier calliper
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
A vernier scale is a visual aid to take an accurate measurement reading between two graduation markings on a linear scale by using mechanical interpolation; thereby increasing resolution and reducing measurement
Source: Myschool Past Questions Archive (Record #47678)
Physics
UTME / JAMB 2018
Work, Energy, Power & Simple Machines
Solution
A pulley system has three pulleys in the fixed block and two in the movable block and if the pulley has an efficiency of 72%, the mechanical advantage of the system is?
A
36.0
B
7.2
C
5.0
D
3.6
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Mechanical Advantage = V.R \times Efficiency
= 5 \times 0.72
= 3.6
Source: Myschool Past Questions Archive (Record #47679)
Physics
UTME / JAMB 2018
Current Electricity & Electric Circuits
Solution
When an atom loses or gain a charge it becomes
A
An electron
B
An ion
C
A neutron
D
A proton
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
If an atom gains or loses an electron, it becomes an ion. An atom that gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion
Source: Myschool Past Questions Archive (Record #47680)
Physics
UTME / JAMB 2018
Newton's Laws, Momentum & Collisions
Solution
A ball of mass 800g moving horizontally with a speed of 5m/s hits a vertical wall and rebounds with the same speed. The impulse experienced by the ball is?
A
0kgm
B
2kgm/s
C
4kgm/s
D
8kgm/s
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Initial momentum = (0.8) \times (5)
= 4.0kgms\(^{-1}\)
Final momentum
= (0.8) \times (– 5)
= – 4.0kgms\(^{-1}\)
Impulse on ball
= Change in momentum
= 4.0 – (– 4.0)
= 8.0.0kgms\(^{-1}\)
Source: Myschool Past Questions Archive (Record #47681)