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Physics
UTME / JAMB 2019
Mechanics and Properties of Matter
Solution
Ripple in a power supply unit is caused by
A
using an alternating current source
B
forward voltage drop
C
heavy load
D
using a zener diode
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
The fluctuation of d.c signal results from the rectification of A.C source to d.c.
Source: Myschool Past Questions Archive (Record #54997)
Physics
UTME / JAMB 2019
Mechanics and Properties of Matter
Solution
When the temperature of a liquid is increased, its surface tension?
A
increases
B
decreases
C
remain constant
D
increases then decreases
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Surface tension or elasticity of a fluid decreases with increased temperature
Source: Myschool Past Questions Archive (Record #55000)
Physics
UTME / JAMB 2019
Waves and Optics
Solution
The distance between an object and its real image in a convex lens is 40cm. If the magnification of the image is 3, calculate the focal length of the lens
A
6.5 cm
B
7.5 cm
C
8.5 cm
D
4.5 cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
u + v = 40
\(\frac{v}{u}\) = 3
v = 3u
u + 3u = 40
4u = 40
u = 10cm
v = 3u = 30cm
f = \(\frac{uv}{u + v} = \frac{10(30)}{10 + 30} = \frac{300}{40}\)
= 7.5 cm
Source: Myschool Past Questions Archive (Record #55005)
Physics
UTME / JAMB 2019
Waves and Optics
Solution
A ray of light passes through the centre of curvature of a concave mirror and strikes the mirror. At what angle is the ray reflected?
A
180\(^o\)
B
90\(^o\)
C
0\(^o\)
D
60\(^o\)
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
- a ray of light passing through the centre of a curvature is returned along the same path
- angle difference along the same path is zero
Source: Myschool Past Questions Archive (Record #55008)
Physics
UTME / JAMB 2019
Heat Energy & Temperature
Solution
The pin-hole camera produces a less sharply defined image when the
A
pin-hole is larger
B
illumination is less
C
screen is further from the pin-hole
D
object is further from the pin-hole
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
- a less sharp or blurred image is due to increased brightness
- increase brightness is also due to large hole or many pin holes
Source: Myschool Past Questions Archive (Record #55010)
Physics
UTME / JAMB 2019
Mechanics and Properties of Matter
Solution
A straight wire 15cm long, carrying a current of 6.0A is in a uniform field of 0.40T. What is the force on the wire when it is at right angle to the field
A
0.46N
B
0.35N
C
0.36N
D
0,24N
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
F = BIL = 0.4 x 6 x \(\frac{15}{100}\)
= 0.36N
Source: Myschool Past Questions Archive (Record #55012)
Physics
UTME / JAMB 2019
Heat Energy & Temperature
Solution
The pitch of a screw jack is 0.45cm and the arm is 60cm long. If the efficiency of the Jack is 75/\pi %, calculate the mechanical advantage.
A
400
B
300
C
200
D
150
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
P = 0.45cm, L = 60cm, Eff = 75/\pi%
VR
(Screw
system)
=
2\pir
P
=
2\piL
P
M.A
=
Eff% \times VR
100
=
75
\pi
\times
1
100
\times
2\pi \times 60
0.45
=
75 \times 800
300
=
200
Source: Myschool Past Questions Archive (Record #55044)
Physics
UTME / JAMB 2019
Electricity and Magnetism
Solution
When the downward current flows in a straight vertical conductor, the direction of its magnetic field at a point due north of the wire is?
A
Upward
B
North
C
South
D
West
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
At a point due N of the wire, the field is due west, at a point due S of the wire, the field is due eest.
Source: Myschool Past Questions Archive (Record #55058)
Physics
UTME / JAMB 2019
Heat Energy & Temperature
Solution
Aluminium is sometimes used as the leaf of an electroscope because it
A
is a light material
B
is a good conductor
C
is a good insulator
D
can be converted into thin sheets
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
- Aluminium can be made in thin sheet like Gold.
- the leaf is a thin material that can be diverged easily.
Source: Myschool Past Questions Archive (Record #55061)
Physics
UTME / JAMB 2019
Heat Energy & Temperature
Solution
The diagram above represents the stress-strain graph of a loaded wire. Which of these statements is correct?
A
At J, the wire becomes plastic
B
J is the yield point
C
L is the elastic limit
D
At K, the wire breaks
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
- I is the elastic limit
- the end of the constant part J is the yield point
- L is the break point.
Source: Myschool Past Questions Archive (Record #55067)
Physics
UTME / JAMB 2019
Electricity and Magnetism
Solution
A supply of 400V is connected across capacitors of 3\muf and 6\muf in series. Calculate the charge
A
8 x 10\(^{-4}\)C
B
4 x 10\(^{-2}\)C
C
8 x 10\(^{-3}\)C
D
4 x 10\(^{-8}\)C
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
C\(_T\) = \(\frac{C_1 \times C_2}{C_1 + C_2}\)
= \(\frac{3 \times 6}{3 + 6}\)
= \(\frac{18}{9}\) = 2\muf
Q = CV
⇒ 2 \times 10\(^{-6}\) \times 400
⇒ 800 \times 10\(^{-6}\)C = 8 \times 10\(^{-4}\)C
Source: Myschool Past Questions Archive (Record #55090)
Physics
UTME / JAMB 2019
Waves and Optics
Solution
A vibrator causes water ripples to travel across the surface of a tank. The wave travels 50cm in 2s and the distance between successive crests is 5cm. Calculate the frequency of the vibrator
A
5Hz
B
6Hz
C
5.2Hz
D
25Hz
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
\(V = \frac{Distance}{time}\)
= \(\frac{50cm}{2s}\)
= 25 cms\(^{-1}\).
\(V = f \lambda\)
\(f = \frac{V}{\lambda}\)
\(f = \frac{25}{5}\)
= 5 Hz
Source: Myschool Past Questions Archive (Record #55098)
Physics
UTME / JAMB 2019
Thermal Physics
Solution
A thermocouple thermometer is connected to a millivoltmeter which can read up to 10mV. When one junction is in ice at 0^\circC and the other is steam at 100^\circC, the millivoltmeter reads 4mV. What is the maximum temperature which this arrangement can measure
A
100\(^o\)C
B
248\(^o\)C
C
250\(^o\)C
D
350\(^o\)C
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
t\(_\theta\) - t\(_o\) = 10,
t\(_{100}\) - t\(_o\) = 4
\theta
=
t\(_\theta\) - t\(_o\)
t\(_{100}\) - t\(_o\)
\times
100
10
4
\times
100
=
250^\circC
Source: Myschool Past Questions Archive (Record #55103)
Physics
UTME / JAMB 2019
Electricity and Magnetism
Solution
An alternating current can induce voltage because it has
A
ripple value
B
varying magnetic field
C
weaker magnetic field than direct current
D
high peak value
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
As induced voltage is produced by varying magnetic field. The induced voltage is proportional to the rate of change of magnetic flux linking the coil.
Source: Myschool Past Questions Archive (Record #55227)
Physics
UTME / JAMB 2019
Mechanics and Properties of Matter
Solution
The limiting frictional force between two surfaces depends on
I. the cohesive force of the material
II. the nature of the surfaces in contact
III. the relative velocity between the surfaces
A
I only
B
II only
C
III only
D
I & IV only
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
- Friction depends on the nature of the surfaces in contact
Source: Myschool Past Questions Archive (Record #55228)