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Physics
UTME / JAMB 1998
Elasticity, Density, Pressure & Fluids
A vapour is said to be saturated when
A
more molecules return to the liquid than the amount that left it
B
a dynamic equilibrium exists between the molecules of the liquid and the vapour molecules at a given temperature
C
the vapour pressure is equal to the atmospheric pressure
D
all molecules are moving with the same speed in all directions at a given temperature
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 #27635)
Physics
UTME / JAMB 1998
Current Electricity & Electric Circuits
One valid assumption of the kinetic theory of gasses is the
A
the molecules of a gas are constantly in a state of motion and the number of collision remains constant
B
the number of molecule of gas increases with increasing pressure
C
as the temperature increases, the number of collision made by the gas molecule remains constant
D
the molecules of gas are all identical and are very small in size
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 #27637)
Physics
UTME / JAMB 1998
Waves, Sound & Vibrations
The physical properties of sound waves can best be described by
A
reflection and diffraction
B
polarization and reflection
C
polarization and diffraction
D
polarization and refraction
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 #27639)
Physics
UTME / JAMB 1998
Waves, Sound & Vibrations
In a closed organ pipe producing a musical note, an antinode will always be produced at
A
the closed end
B
the open end
C
the middle
D
all the parts of the pipe
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 #27640)
Physics
UTME / JAMB 1998
Waves, Sound & Vibrations
Solution
A steel wire of length 0.50m is stretched between two fixed points and its fundamental frequency is 200Hz. The speed of the wave in the wire is
A
100ms-1
B
120ms-1
C
200ms-1
D
250ms-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
In strings, \(\lambda\) = 2L
V = F\(\lambda\)
= 200 x 2 x 0.5
= 200ms-1
Source: Myschool Past Questions Archive (Record #27641)
Physics
UTME / JAMB 1998
Waves, Sound & Vibrations
Solution
In a resonance tube experiment, if the fundamental frequency of the vibrating air column is 280Hz, the frequency of the third overtone is
A
70Hz
B
840Hz
C
1120Hz
D
1960Hz
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
F3 = 7Fo
= 7 x 280
= 1960Hz
Source: Myschool Past Questions Archive (Record #27643)
Physics
UTME / JAMB 1998
Reflection, Refraction & Dispersion of Light
Solution
An object 0 lies at a distance m in front of concave mirror of focal length f. If m < f, then the final image obtained will be
A
virtual and diminished
B
magnified and erect
C
real and inverted
D
diminished and erect
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
In a concave mirror, when the object distance is less than the focal length, we have an image which is:
- Virtual
- Erect and
- Magnified.
Source: Myschool Past Questions Archive (Record #27646)
Physics
UTME / JAMB 1998
Reflection, Refraction & Dispersion of Light
Solution
An object is placed in front of two plane mirrors inclined at an angle of 0o. If the total number of images formed is 7, Find the value of \(\theta\)
A
30o
B
45o
C
51o
D
90o
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Number of image = \(\frac{360}{\theta}\) -1
7 = \(\frac{360}{\theta}\) -1
thus,\(\theta\) = 45o
Source: Myschool Past Questions Archive (Record #27649)
Physics
UTME / JAMB 1998
Reflection, Refraction & Dispersion of Light
Solution
The displacement d produced in a glass block of thickness t and refractive index n when an object is viewed through it is
A
t – n
B
t (1 + 1/n)
C
t (1-1/n)
D
t (1/n - 1)
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
n = \(\frac {\text{real depth}}{\text {apparent depth}{}}\)
n = \(\frac {t}{t-d}\)
\(\frac{t - d}{1}\) = \(\frac{t}{n}\)
-d = \(\frac{t}{n}\) - t
d = - \(\frac{t}{n}\) + t
d = t - \(\frac{t}{n}\)
d =t (1 - \(\frac{1}{n}\))
Source: Myschool Past Questions Archive (Record #27653)
Physics
UTME / JAMB 1998
Lenses & Optical Instruments
Solution
A man wears convex lens glasses of focal length 30cm in order to correct his eye defect. instead of the optimum 25cm, his least distance of distinct vision is
A
14cm
B
28cm
C
75cm
D
150cm
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
F = \(\frac{uv}{u + v}\)
F = +ve
v = -ve
30 = \(\frac {25 {\times} (-v)}{25 + (-v)}\)
-25v = 750 - 30v
5v = 750
v = 150cm
(Note that either negative or positive values go to show the positioning and hence, they are not a strong necessity in your final answer.)
Source: Myschool Past Questions Archive (Record #27655)
Physics
UTME / JAMB 1998
Gas Laws & Heat Transfer
Which of the following are true about the infra-red radiation? i. it is invisible ii. it is called heat ray iii. its frequency is higher than that of blue light iv. it travels as a transverse wave
A
i, ii, iii and iv
B
i, ii, iv only
C
i, iii, iv only
D
ii, iii, iv only
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 #27658)
Physics
UTME / JAMB 1998
Current Electricity & Electric Circuits
Solution
The force of repulsion between two point positive charges 5\(\mu\)C and 8\(\mu\)C separated at a distance of 0.02m apart is. [\(\frac{1}{4{\pi}{\varepsilon}_o}\) = 9 x 10\(^9\)Nm\(^2\)C\(^{-2}\)]
A
1.8 x 10-10N
B
9.0 x 10-8N
C
9.0 x 102N
D
4.5 x 103N
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
F =\(\frac{1}{4{\pi}{\varepsilon}_o}\) x \(\frac {q_1q_2}{r^2}\)
F =\(\frac {5 {\times} 10^{-6} {\times} 8 {\times} 10^{-6}}{0.002 {\times} 0.002}\) x 9 x 10\(^9\)
F = 900N
Source: Myschool Past Questions Archive (Record #27660)
Physics
UTME / JAMB 1998
Current Electricity & Electric Circuits
An ebonite rod rubbed with fur attracts a glass rod rubbed with silk because
A
ebonite has a negative charge while glass has a positive charge
B
ebonite has a positive charge while glass has a negative charge
C
both have negative charges
D
both have positive charges
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 #27661)
Physics
UTME / JAMB 1998
Current Electricity & Electric Circuits
Which of the following can be used to reduce local action in a Laclanche cell?
A
A carbon rod as the positive pole
B
Pure zinc as the negative pole
C
Potassium permanganate solution in contact with the positive pole
D
common salt solution
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 #27662)
Physics
UTME / JAMB 1998
Work, Energy, Power & Simple Machines
Solution
Find the work done in moving a 2 C charge between two points X and Y in an electric field if the potential difference is 100 volts
A
50J
B
100J
C
200J
D
400J
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
V = \(\frac{W}{Q}\)
W = VQ
W = 100 x 2
W = 200J
Source: Myschool Past Questions Archive (Record #27663)