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Physics
UTME / JAMB 1995
Waves, Sound & Vibrations
Solution
The wavelength of signals from a radio transmitter is 1500mm and the frequency is 200kHz. What is the wavelength for a transmitter operating at 100kHz?
A
7500m
B
300m
C
75m
D
15m
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
\(\lambda\)1F1 = \(\lambda\)2F2
1500 x 200000 = 1000000 x \(\lambda\)2
\(\lambda\)2 = 300m
Source: Myschool Past Questions Archive (Record #27837)
Physics
UTME / JAMB 1995
Current Electricity & Electric Circuits
The difference between sound waves and light waves is that sound waves
A
are transverse while light waves are longitudinal
B
require a medium to travel while light waves does not
C
can be diffracted but light waves cannot
D
cannot be reflected but light waves can
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 #27838)
Physics
UTME / JAMB 1995
Waves, Sound & Vibrations
Solution
The pitch of an acoustic device can be increased by
A
increasing the frequency
B
increasing the amplitude
C
decreasing the loudness
D
decreasing the intensity
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Increasing the frequency of a sound wave raises its pitch. The amplitude affects the loudness, but not the pitch.
Source: Myschool Past Questions Archive (Record #27839)
Physics
UTME / JAMB 1995
Current Electricity & Electric Circuits
Total eclipse of the sun occurs when the
A
earth is between the moon and the sun
B
sun is between the moon and the earth
C
moon is between the sun and the earth
D
ozone layer is threatened
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 #27840)
Physics
UTME / JAMB 1995
Reflection, Refraction & Dispersion of Light
Solution
What is the approximate critical angle for total internal reflection for diamond if the refractive index of diamond is 2.42?
A
21o
B
22o
C
23o
D
24o
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
SinC = \(\frac{1}{n}\)V2
SinC = \(\frac{1}{2.42}\)
SinC =24o
Source: Myschool Past Questions Archive (Record #27841)
Physics
UTME / JAMB 1995
Lenses & Optical Instruments
Solution
A real object is placed at a distance ucm in front of a curved mirror of focal length fcm. If the image is upright and magnified, then the mirror is
A
convex and u =2f
B
concave and u = 2f
C
convex and u = f
D
concave and u = f
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
-The image formed by a concave lens is always virtual, erect and magnified.
-The image formed by a concave mirror can be real or virtual, enlarged or diminished, and erect or inverted, depending upon the distance of the object from the mirror
Source: Myschool Past Questions Archive (Record #27842)
Physics
UTME / JAMB 1995
Current Electricity & Electric Circuits
Solution
Which of the following pairs of colours gives the widest separation in the spectrum of white light?
A
Red and Violet
B
Green and Yellow
C
Red and Indigo
D
Yellow and Violet
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
When white light is passed through a glass prism it splits into its spectrum of colours (violet, indigo, blue, green, yellow, orange, and red) and this process of separating white light into its constituent colours is called dispersion.
Source: Myschool Past Questions Archive (Record #27843)
Physics
UTME / JAMB 1995
Electrostatics & Capacitors
Solution
Two parallel plates at a distance of 8.0 x 10-3m apart are maintained at a p.d of 600 volts with the negative plate earthed. What is the electric field strength?
A
4.8 Vm-1
B
75.0Vm-1
C
4800.0Vm-1
D
75000.0Vm-1
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
E = \(\frac{voltage}{distance}\)
= \(\frac{600}{8 \times 10^2}\)
= 75000.0Vm-1
Source: Myschool Past Questions Archive (Record #27844)
Physics
UTME / JAMB 1995
Magnetism, Electromagnetism & AC Circuits
Solution
At different locations on the earth's surface, the earth's magnetic field is
A
the same in magnitude and direction
B
the same in magnitude but different in direction
C
different in both magnitude and direction
D
different in magnitude but different in direction
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
The magnetic field around the earth is like that around the bar magnet.
The magnetic lines of force emerge from the geographic south pole and enter the north pole forming closed loops. Hence the magnetic field changes in both magnitude and direction at different locations on the earth's surface.
Source: Myschool Past Questions Archive (Record #27845)
Physics
UTME / JAMB 1995
Current Electricity & Electric Circuits
Solution
If a resistance is halved in value and the potential difference across it is tripled, then the ratio of the new current to the old one is
A
1 : 6
B
1 : 3
C
2 : 1
D
6 : 1
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
\(\frac{V_1}{V_2}\) = \(\frac{I_1R_1}{I_2R_2}\)
\(\frac{I_1}{I_2}\)V2 = 3V1 and R1 = 2R2
\(\frac{V_1}{3V_1}\) = \(\frac{I_1 \times\ 2R_2}{I_2\times R_2}\)
\(\frac{I_1}{I_2}\) = \(\frac{6}{1}\)
Source: Myschool Past Questions Archive (Record #27846)
Physics
UTME / JAMB 1995
Current Electricity & Electric Circuits
Solution
A 12V battery has an internal resistance of 0.5W.If a cable of 1.0W resistance is connected across the two terminals of the battery, the current drawn from the battery is
A
16.0A
B
8.0A
C
0.8A
D
0.4A
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
I = \(\frac{E.m.f}{R + r}\)
= \(\frac{12}{1 + 0.5}\)
I = 8A
Source: Myschool Past Questions Archive (Record #27847)
Physics
UTME / JAMB 1995
Electrostatics & Capacitors
Solution
The purpose of a dielectric material in a parallel plate capacitor is to
A
increase its capacitance
B
decrease its capacitance
C
insulate the plate from each other
D
increase the magnetic field between the plates
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
A dielectric increases capacitance by becoming polarized and reducing the effective electric field between capacitor plates, allowing more charge to be stored.
Source: Myschool Past Questions Archive (Record #27850)
Physics
UTME / JAMB 1995
Current Electricity & Electric Circuits
Solution
An electric current of 2 amperes flows in a heating coil of resistance 50 ohms for 3 minutes 20 seconds. Determine the heat produced
A
0.5kJ
B
8.0kJ
C
20.0kJ
D
40.0kJ
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Heat energy = Elect. energy
heat energy= I2RT
= 2 X 2 X 50 X 200
= 40000J
to convert to kJ, divide J by 1000
hence, \(\frac{40000}{1000}\) = 40kJ
Source: Myschool Past Questions Archive (Record #27853)
Physics
UTME / JAMB 1995
Current Electricity & Electric Circuits
Solution
If the maximum voltage across a 100ohms resistor is 20V, then the maximum power it can dissipate is
A
5.00W
B
4.00W
C
2.00W
D
25W
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
P = \(\frac{V^2}{R}\)
= \(\frac{20 \times 20}{100}\)
= 4W
Source: Myschool Past Questions Archive (Record #27854)
Physics
UTME / JAMB 1995
Current Electricity & Electric Circuits
Which of the following is required to convert a milliammeter to an ammeter?
A
A high resistance in parallel
B
A high resistance in series
C
A low resistance in parallel
D
A low resistance in series
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 #27855)