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Physics
UTME / JAMB 1995
Calorimetry, Latent Heat & Change of State
A quantity of ice at 10oC is heated until the temperature of the heating vessel is 90oC. Which of the following constants is NOT required to determine the quantity of heat supplied to the vessel?
A
specific heat capacity of ice
B
specific heat capacity of water
C
specific latent heat of fusion
D
specific latent heat of vaporization
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 #27821)
Physics
UTME / JAMB 1995
Calorimetry, Latent Heat & Change of State
Which of the following statements give the TRUE difference between evaporation and boiling? i. Evaporation occurs at all temperatures while boiling occurs at a fixed temperature for a given pressure. ii. Evaporation is a surface phenomenon while boiling is an interior phenomenon. iii. Evaporation is affected by surface area while boiling is not.
A
i and ii only
B
i and iii only
C
ii and iii only
D
i, ii, iii.
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 #27827)
Physics
UTME / JAMB 1995
Current Electricity & Electric Circuits
Solution
A well-lagged bar of length 100cm has its ends maintained at 100oC and 40oC respectively. What is the temperature at a point 60cm from the hotter end?
A
58oC
B
62oC
C
64oC
D
76oC
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
In a well-lagged bar at steady state, temperature decreases linearly with distance
Temperature gradient = \(\frac{\Delta T}{\text{L}}\)
= \(\frac{100 - 40}{100}\) = 0.6º C/cm
Temperature drops at 60cm = 0.6 x 60 = 36º C
Final temperature = 100ºC - 36ºC = 64ºC
Source: Myschool Past Questions Archive (Record #27835)
Physics
UTME / JAMB 1995
Waves, Sound & Vibrations
Solution
Which of the following is the exclusive property of a transverse wave?
A
diffraction
B
refraction
C
compression
D
polarization
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Transverse waves oscillate at right angles to the direction of wave propagation, which enables the phenomenon of polarization.
Source: Myschool Past Questions Archive (Record #27836)
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)