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Physics
UTME / JAMB 1992
Gas Laws & Heat Transfer
The space between the double glass walls of a thermos flask is evacuated space are silvered. The residual source of heat loss takes place by
A
convection
B
radiation from the surface
C
conduction through the stopper and the glass
D
conduction across the walls
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 #28068)
Physics
UTME / JAMB 1992
Current Electricity & Electric Circuits
Solution
The equation of a wave is y = 0.005 sin[x(0.5X - 200t)] where x and y are in meters and t is in seconds. What is the velocity of the wave?
A
4000ms-1
B
400ms-1
C
250ms-1
D
40ms-1
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
y = 0.005 sin[x(0.5X - 200t)]
compare to Y = A sin(kx - wt)
\(\lambda\) = \(\frac{2\pi}{k}\) and F = \(\frac{w}{2\pi}\)
V= \(\lambda\)F
= \(\frac{2\pi}{0.5}\) x \(\frac{200}{2\pi}\)
= 400ms-1
Source: Myschool Past Questions Archive (Record #28073)
Physics
UTME / JAMB 1992
Waves, Sound & Vibrations
Solution
Which of the following characteristics of a wave is used in the measurement of the depth of the sea?
A
diffraction
B
interference
C
refraction
D
reflection
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Reflection: These waves travel through the water, hit the seabed, and bounce back toward the surface. This phenomenon is called reflection, and the returned sound is known as an echo
Source: Myschool Past Questions Archive (Record #28074)
Physics
UTME / JAMB 1992
Waves, Sound & Vibrations
Solution
A note is the octave of another note if it has
A
a frequency twice that of the first note
B
frequency half that of the first note
C
the same fundamental frequency as the first one
D
a frequency frequency eight times that of the first note
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
When the frequency of a note is doubled, it is perceived as being one octave higher. For example, if a note has a frequency of fff, the note one octave higher will have a frequency of 2f. Conversely, a note that is one octave lower has a frequency half that of the original note, but the question specifically asks for the octave above
Source: Myschool Past Questions Archive (Record #28075)
Physics
UTME / JAMB 1992
Current Electricity & Electric Circuits
Solution
What is the frequency of the sound made by a siren having a disc with 32 holes and making 25 revolution per seconds?
A
80Hz
B
600Hz
C
800Hz
D
1600Hz
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No of holes x Revolution
F = NH x NR
= 32 x 25
= 800Hz
Source: Myschool Past Questions Archive (Record #28079)
Physics
UTME / JAMB 1992
Reflection, Refraction & Dispersion of Light
Which of the following properties make the convex mirror useful as a driving mirror? i. the image is real. ii. the image is erect. iii. it has a wide field of view. iv. the image is magnified.
A
i, ii, and iv
B
i, ii, iii
C
ii and iii
D
i and iii
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 #28080)
Physics
UTME / JAMB 1992
Reflection, Refraction & Dispersion of Light
Solution
When an object is placed very close to the pole of a concave mirror, the virtual image obtained is
A
diminished and upright
B
diminished and inverted
C
enlarged and inverted
D
enlarged and upright
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
When an object is placed very close to the pole of a concave mirror, the mirror produces a virtual image larger than the object and upright. This occurs because the object is within the focal point of the concave mirror.
Source: Myschool Past Questions Archive (Record #28082)
Physics
UTME / JAMB 1992
Reflection, Refraction & Dispersion of Light
Solution
A concave mirror has a radius of curvature of 36cm. At what distance from the mirror should an object be placed to give a real image three times the size of the object?
A
12cm
B
24cm
C
48cm
D
108cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
F = \(\frac{uv}{u + v}\)
v = 3u
18 = \(\frac{3u \times u}{3u + u}\)
u = 24cm
Source: Myschool Past Questions Archive (Record #28084)
Physics
UTME / JAMB 1992
Lenses & Optical Instruments
Which of the following statements is CORRECT about a long-sighted boy who does not put on glasses?
A
He cannot see distant objects clearly
B
Rays of light from a close object are focused in front of his retina
C
His eye ball is too long
D
Parallel rays of light are focused behind his retina
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 #28087)
Physics
UTME / JAMB 1992
Reflection, Refraction & Dispersion of Light
Solution
The speed of light in air is 3 x 10\(^8\)ms\(^{-1}\). What is the speed in glass with a refractive index of 1.50?
A
1.5 x 108ms-1
B
3.0 x 108ms-1
C
2.0 x 108ms-1
D
6.0 x 108ms-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
n = \(\frac{\text{c}}{\text{v}}\)
1.5 = \(\frac{3 \times 10^8}{v}\)
v = 2.0 x 108ms-1
Source: Myschool Past Questions Archive (Record #28091)
Physics
UTME / JAMB 1992
Reflection, Refraction & Dispersion of Light
Solution
If the refractive index of a medium in air is 2.0, what is the critical angle for this medium?
A
30o
B
42o
C
45o
D
50o
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
sin c = \(\frac{1}{n}\) = \(\frac{1}{2}\)
c = sin-1\((\frac{1}{n})\)
= 30o
Source: Myschool Past Questions Archive (Record #28094)
Physics
UTME / JAMB 1992
Atomic, Quantum, Nuclear Physics & Electronics
Which of the following arrangements of the components of electromagnetic spectrum is in ascending order of wavelengths?
A
Gamma rays, ultraviolet rays, X- rays, infra - red rays
B
Gamma rays, X-rays, ultraviolet rays, infra-red rays
C
infra-red rays, ultraviolet rays, X-rays, gamma rays
D
Gamma rays, ultraviolet rays, infra-red rays, X-rays
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 #28095)
Physics
UTME / JAMB 1992
Magnetism, Electromagnetism & AC Circuits
The angle between the direction of the earth's magnetic field and the horizontal is called the
A
angle of deviation
B
magnetic declination
C
magnetic meridian
D
angle of dip
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 #28097)
Physics
UTME / JAMB 1992
Electrostatics & Capacitors
Solution
Calculate the force acting on an electron of charge 1.6 x 10-19C placed in an electric field of intensity 108Vm-1
A
1.6 x 10-11N
B
1.6 x 10-14N
C
1.6 x 10-16N
D
1.0 x 10-16N
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
F = EQ
1.6 x 10-19 x 108
= 1.6 x 10-11N
Source: Myschool Past Questions Archive (Record #28100)
Physics
UTME / JAMB 1992
Current Electricity & Electric Circuits
Solution
When an ebolite rod is rubbed with fur, it has
A
no charge at all
B
a negative charge
C
a positive charge
D
negative and positive charges
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
When an ebonite rod is rubbed with fur, the ebonite gains electrons from the fur. As a result: - The ebonite rod becomes negatively charged. - The fur becomes positively charged.
Source: Myschool Past Questions Archive (Record #28103)