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Physics
UTME / JAMB 1978
Current Electricity & Electric Circuits
Solution
In order to convert a galvanometer into an ammeter
A
a low resistance shunt is connected in parallel
B
a low resistance shunt is connected in series
C
a medium resistance shunt is connected in series
D
a high resistance shunt is connected in parallel
E
a high resistance shunt is connected in series
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
To convert a galvanometer into an ammeter, we need to modify it so it can measure higher currents without damage.
A galvanometer is a very sensitive device that can only pass a small current (called full-scale deflection current, Ig) safely. We connect a low resistance called shunt (S) in parallel with the galvanometer.
Source: Myschool Past Questions Archive (Record #29293)
Physics
UTME / JAMB 1978
Electrostatics & Capacitors
Solution
In a D.C. circuit, a 10 microfarad (mf) capacitor is placed in series with a 10 0hm resistor. The total resistance of the combination is
A
10 ohms
B
1 ohms
C
zero
D
20 ohms
E
infinite
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Capacitor has an infinite resistance to D.C.
Source: Myschool Past Questions Archive (Record #29294)
Physics
UTME / JAMB 1978
Magnetism, Electromagnetism & AC Circuits
Solution
On an a.c generator, which of the following does not apply?
A
field magnet
B
commutator
C
armature
D
slip rings
E
carbon brushes
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
An AC generator consists of the following parts:
Field Magnet: It is a horseshoe-shaped permanent magnet that produces a strong magnetic field in the space between its two poles.
Armature: It is a rectangular coil with a huge number of insulated copper wire that turns on a cylindrical core of soft iron.
Slip Rings: The two ends of the armature are connected with the help of slip rings.
Brushes: Two brushes, made up of graphite or a flexible metal rod, are pressed against the two slip rings. These brushes are responsible for feeding the current produced in the armature coil to the external circuit via wires.
Energy Source: The armature coil is rotated about its axis with the help of a turbine. The rotational kinetic energy of the turbine is the factor that helps an AC generator produce electricity.
Source: Myschool Past Questions Archive (Record #29295)
Physics
UTME / JAMB 1978
Electrostatics & Capacitors
Solution
Why is it impossible for the lines of force of an electric field to cross one another?
A
like charges repel each other
B
a charged particle is deflected by an eletric field
C
like charges are arranged on the same line of force
D
a positively charged particle can travel in only one direction at any time
E
none of these is correct
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Electric field lines do not intersect each other because if they do, then the field at the point of intersection will not have a unique direction.
Source: Myschool Past Questions Archive (Record #29298)
Physics
UTME / JAMB 1978
Current Electricity & Electric Circuits
Solution
A potential difference of 6v is used to produce a current of 5A for 200s through a heating coil. The heat produced is
A
4800 cal
B
6000 cal
C
2400J
D
240k cal
E
6000J
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Heat energy = Elect. energy = Ivt
= 5 x 6 x 200
= 6,000J
Source: Myschool Past Questions Archive (Record #29299)
Physics
UTME / JAMB 1978
Current Electricity & Electric Circuits
The electric supply from Kainji Dam is transmitted at high voltages of the order hundreds of kilovolts but is converted to domestic use of about 220 volts by
A
commutators
B
transistors
C
valves and diodes
D
rectifiers
E
transformers
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #29300)
Physics
UTME / JAMB 1978
Current Electricity & Electric Circuits
Every house supplied with electricity is provided with a box of fuses so that
A
the consumption of electricity can be recorded
B
people residing in the house will not have an electric shock if they touch a live wire
C
the total current drawn from the mains can be limited
D
the voltage supply can be stabilized
E
it serves as a standby supply when there is a power failure
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 #29302)
Physics
UTME / JAMB 1978
Current Electricity & Electric Circuits
An electric charge could be transmitted through
A
wood, rubber and stone
B
paper, clay and plastic
C
glass, acid and cloth
D
The human body, water and metals
E
all of the above
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 #29308)
Physics
UTME / JAMB 1978
Waves, Sound & Vibrations
Solution
a guitar string is 75cm long. the wavelength of its fundamental note is
A
75cm
B
150cm
C
37.5cm
D
112cm
E
50cm
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Wavelength = 2L = 2 X 75
Wavelength = 150
Source: Myschool Past Questions Archive (Record #29309)
Physics
UTME / JAMB 1978
Current Electricity & Electric Circuits
The boys are communicating with each other by stretching a string passing through a hole punched in the bottom of each of two tin cans. The physical principle employed is that sound travels
A
mainly through air
B
fainter in stretched string
C
faster through gases than in solids and liquids
D
with greater ease through a string than in air
E
none of the above is correct
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 #29310)
Physics
UTME / JAMB 1978
Waves, Sound & Vibrations
Solution
A herdsman yelling out to fellow herdsman heard his voice reflected by cliff 4s later. What is the velocity of sound in air if the cliff is 680m away?
A
170ms-1
B
136ms-1
C
340ms-1
D
680ms-1
E
510ms-1
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Velocity = \(\frac{\text{distance}}{\text{time}}\)
echo time = halt total time
= \(\frac{1}{2}\) x 4 = 2
velocity = \(\frac{680}{2}\)
= 340ms\(^{-1}\)
Source: Myschool Past Questions Archive (Record #29311)
Physics
UTME / JAMB 1978
Lenses & Optical Instruments
Solution
an object 1cm high placed on the axis 15cm from a converging lens forms an image 30cm from the lens. The size of the image is
A
0.5cm
B
1.5cm
C
3cm
D
2.5m
E
2cm
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
\(\frac{\text{image distance}}{\text{object distance}}\) = \(\frac{\text{image height}}{\text{object height}}\)
\(\frac{30}{15}\) = \(\frac{\text{image height}}{1}\)
image height = 2cm
Source: Myschool Past Questions Archive (Record #29312)
Physics
UTME / JAMB 1978
Current Electricity & Electric Circuits
Solution
The visible part of light consists of the following colours
A
red, indigo, infra-red, violet, yellow, green and blue
B
red, green, blue, violet, indigo, orange and yellow
C
blue, ultra-violet, infra-red, red, yellow, indigo, violet,green and orange
D
infra-red and ultra-violet
E
red, orange, yellow, green, blue, indigo and infra-red
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The visible colors of white light is given by the acronym: ROYGBIV which stands for Red, Orange, Yellow, Green, Blue, Indigo and Violet.
Source: Myschool Past Questions Archive (Record #29314)
Physics
UTME / JAMB 1978
Reflection, Refraction & Dispersion of Light
Solution
An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit distance from each mirror, the number of images formed is
A
1
B
2
C
3
D
4
E
5
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
No. of image formed = \(\frac{360}{\theta}\) - 1
= \(\frac{360}{90}\) - 1
= 3 images
Source: Myschool Past Questions Archive (Record #29315)
Physics
UTME / JAMB 1978
Reflection, Refraction & Dispersion of Light
Solution
The angular dispersion of a prism depends on
A
the index of refraction only
B
the angle of incidence as well as the index of refraction
C
the angle of incidence only
D
the thickness of the prism
E
the prism angle
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
Angle of Incidence: Changing the angle at which light strikes the prism affects the angle of refraction, subsequently influencing the dispersion of the light.
Index of Refraction: The prism's index of refraction determines the extent of light bending, which directly impacts the dispersion of different wavelengths.
Source: Myschool Past Questions Archive (Record #29317)