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Physics
UTME / JAMB 2018
Heat Energy & Temperature
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
Waves and Optics
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
Waves and Optics
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
Heat Energy & Temperature
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
Heat Energy & Temperature
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
Electricity and Magnetism
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
Mechanics and Properties of Matter
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)
Physics
UTME / JAMB 2018
Mechanics and Properties of Matter
Solution
The force between the molecules of a liquid in contact with that of a solid is?
A
Adhesive
B
Cohesive
C
Magnetic
D
Repulsive
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The term Adhesive forces refers to the attractive forces between unlike substance
Source: Myschool Past Questions Archive (Record #47682)
Physics
UTME / JAMB 2018
Mechanics and Properties of Matter
Solution
A body of mass 100g moving with a velocity of 10ms-1 collides with a wall. If after collision it moves with a velocity of 2.0ms−1 in the opposite direction, calculate the change in momentum.
A
0.8Ns
B
1.2Ns
C
12.0Ns
D
80.0Ns
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Momentum = Mass x Velocity
Change in Momentum = Mass x (change in velocity)
Change in Momentum = Mass x (v - u)
Mass = 100g = 0.1kg
U = 2ms\(^{-1}\)
V = 10ms\(^{-1}\)
Change in momentum = m (v − u)
= 0.1 (2 -(- 10))
= 0.1 (12)
= 1.2Ns
Source: Myschool Past Questions Archive (Record #47683)
Physics
UTME / JAMB 2018
Mechanics and Properties of Matter
Solution
A 20kg mass is to be pulled up a slope inclined at 30^\circ to the horizontal. If efficiency of the plane is 75%. The force required to pull the load up the plane is J [g=10ms\(^{− 2}\)]
A
87N
B
73.5N
C
133.3N
D
533.2N
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
V. R = \(\frac{1}{Sin\theta}\)
m = 20kg
V.R = \(\frac{1}{Sin 30}\)
= 2
Efficiency = 75%
Load = mg
= 20 x 10 = 200N
Efficiency = \(\frac{M.A}{V.R} \times 100\)
75/100 = \(\frac{M.A}{2}\)
M .A = \(\frac{75 \times 2}{100}\)
M. A = 1.5
Since M. A. = \(\frac{\text{Load}}{\text{Force}}\)
Force = \(\frac{200}{1.5}\)
= 133.3N
Source: Myschool Past Questions Archive (Record #47684)
Physics
UTME / JAMB 2018
Mechanics and Properties of Matter
Solution
The tendency of a body to remain at rest when a force is applied to it is called.
A
Impulse
B
Momentum
C
Inertia
D
Friction
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Inertia, property of a body by virtue of which it opposes any agency that attempts to put it in motion or, if it is moving, to change the magnitude or direction of its velocity. Inertia is a passive property and does not enable a body to do anything except oppose such active agents as forces and torques. A moving body keeps moving not because of its inertia but only because of the absence of a force to slow it down, change its course, or speed it up.
There are two numerical measures of the inertia of a body: its mass, which governs its resistance to the action of a force, and its moment of inertia about a specified axis, which measures its resistance to the action of a torque about the same axis.
Source: Myschool Past Questions Archive (Record #47685)
Physics
UTME / JAMB 2018
Waves and Optics
Solution
An object is placed 20cm from a concave mirror of focal length 10cm. The linear magnification of the image produced is?
A
0
B
\(\frac{1}{2}\)
C
1
D
2
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(\frac{I}{V}\) = \(\frac{1}{f}\) – \(\frac{1}{u}\)
\(\frac{I}{V}\) = \(\frac{1}{10}\) – \(\frac{1}{20}\)
= \(\frac{1}{20}\) V
V = 20cm.
M = \(\frac{V}{U}\)
= \(\frac{20}{20}\)
= 1
Source: Myschool Past Questions Archive (Record #47686)
Physics
UTME / JAMB 2018
Mechanics and Properties of Matter
Solution
The energy needed to move a unit positive charge around a complete electric circuit is called the
A
electromotive force
B
electric potential difference
C
electric energy
D
kinetic energy
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The energy needed to move a unit positive charge around a complete electric circuit is indeed referred to as Electromotive Force (EMF).
Source: Myschool Past Questions Archive (Record #47693)
Physics
UTME / JAMB 2018
Heat Energy & Temperature
Diagram
In the diagram shown, If the south-poles of two magnets stroke a steel bar, the polarities at T and V will respectively be
Attached Figure / Diagram
A
north and south
B
south and south
C
north and north
D
south and north
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 #47431)
Physics
UTME / JAMB 2018
Electricity and Magnetism
In homes, electrical appliances and lamps are connected in parallel because
A
less current will be used
B
less voltage will be used
C
parallel connection does not heat up the wires
D
series connection uses high voltage
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 #47432)