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Physics
UTME / JAMB 1978
Reflection, Refraction & Dispersion of Light
Which of the following is true for the image formed by a convex mirror? i. the image is always virtual ii. the image is always erect iii. the image lies between pole and focus iv. the image is never magnified v. the focus length is negative
A
i only
B
i and ii only
C
ii and iii only
D
i, ii, iii and iv only
E
all five
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 #29319)
Physics
UTME / JAMB 1978
Waves, Sound & Vibrations
Solution
A string is sustaining a stationary wave when
A
the frequency of the wave is not proportional to the wavelength of the wave
B
the amplitude of vibration is always zero
C
two equal waves are travelling in opposite directions
D
the waves are longitudinal
E
the frequency is directly proportional to the length of the string
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
-Standing waves are produced on a string when equal waves travel in opposite directions.
-A stretched string is fixed at both ends, when it is plucked at mid point, two reflected waves of same amplitude and frequency at the ends are travelling in opposite direction and overlap along the length. Then the resultant waves are known as the standing waves (or) stationary waves.
Source: Myschool Past Questions Archive (Record #29322)
Physics
UTME / JAMB 1978
Lenses & Optical Instruments
For the correction of myopic defects in the human eye we require
A
a convex lens
B
a concave lens
C
a combination of concave and convex lenses
D
a prism
E
a concave mirror
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 #29323)
Physics
UTME / JAMB 1978
Atomic, Quantum, Nuclear Physics & Electronics
Of the following which is different from the other?
A
x-rays
B
gamma-rays
C
cathode rays
D
ultra violet rays
E
infrared rays
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 #29324)
Physics
UTME / JAMB 1978
Current Electricity & Electric Circuits
Solution
The net charge on the atom is zero because
A
the electrons and the protons that are charged are in the nucleus
B
the total charge on the electrons is equal to the total charge on the protons
C
the neutrons from a shield around the charged protons
D
the number of electrons in an atom is half the number of protons
E
A and B above
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
An atom is defined as having the same number of electrons (negative charge), protons (positive charge) and neutrons (no charge). This means that it will have the same amount of negative and positive charge, giving it a net zero charge. On the other hand, an ion has different amount of electrons and protons.
Source: Myschool Past Questions Archive (Record #29325)
Physics
UTME / JAMB 1978
Reflection, Refraction & Dispersion of Light
An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit 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 expanded working has been attached for this question yet. The verified answer is Option C.
Source: Official Exam / Past Question Archive
Physics
UTME / JAMB 1978
Calorimetry, Latent Heat & Change of State
The amount of heat required to raise the temperature of a body is
A
Thermal energy
B
thermal conduction
C
heat loss
D
specific heat capacity
E
thermal capacity
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 #41579)
Physics
UTME / JAMB 1978
Current Electricity & Electric Circuits
Solution
Two lamps are rated 40W and 220V each are connected in series. The total power dissipated in both lamps is
A
10W
B
20W
C
40W
D
80W
E
None of the above
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
The total power dissipated by both lamps = 40W + 40W = 80W
Since they are connected in series, the total power dissipated will be equal to the sum of the power dissipated in each lamp.
Source: Myschool Past Questions Archive (Record #41580)
Physics
UTME / JAMB 1978
Current Electricity & Electric Circuits
Diagram
Solution
In The Diagram, what is the value of W
Attached Figure / Diagram
A
5N
B
10N
C
15N
D
20N
E
30N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
W x 2 = 20 x 1
2W = 20
W = \(\frac{20}{2}\) = 10N
(the given diagram is incomplete)
Source: Myschool Past Questions Archive (Record #41593)
Physics
UTME / JAMB 1978
Electrostatics & Capacitors
Diagram
Solution
The equivalent capacitance for the circuit drawn above is
Attached Figure / Diagram
A
18µf
B
4µf
C
2µf
D
12µf
E
13µf
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
capacitors 5microfarad and 7microfarad are parallel to each other, hence effective capacitance = 5 + 7 = 12microfarad
12microfarad and 6 microfarad are in series then effective capacitance =
\(\frac{1}{6} + \frac{1}{12}\)
= \(\frac{3}{12}\)
then effective capacitance = \(\frac{12}{3}\) = 4microfarad
Source: Myschool Past Questions Archive (Record #41594)
Physics
UTME / JAMB 1978
Reflection, Refraction & Dispersion of Light
Diagram
An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit from each mirror. The number of images formed is
Attached Figure / Diagram
A
1
B
2
C
3
D
4
E
5
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 #41595)
Chemistry
UTME / JAMB 1978
Stoichiometry, Mole Concept & Volumetric Analysis
A gas jar was inverted over burning yellow phosphorus floating over water in a beaker. After burning, the water level was found to rise in the gas jar. The water level rises because
A
pressure inside the gas jar is greater than pressure outside it
B
the air in the gas jar had been used up by burning
C
oxygen in the gas jar had been used up by burning
D
nitrogen in the gas jar had been used up by burning
E
the temperature in the jar had risen considerably
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #768)
Chemistry
UTME / JAMB 1978
Non-Metals & Their Compounds
Solution
You are provided with five gas jars containing SO2, CO2, H2, CO and NO respectively. Select a test from A to E which will identify ANY ONE of the gases completely
A
pass each gas into lime water
B
pass each gas into water and test with litmus paper
C
pass each gas into concentrated sulphuric acid
D
expose each gas to atmospheric air
E
expose each gas to fumes of hydrogen chloride
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Option D is correct because exposing the gas jars to atmospheric air allows Nitrogen(II) oxide (NO) to be definitively identified. (NO) is a colourless gas that immediately reacts with oxygen in the atmospheric air to form Nitrogen(IV) oxide ((NO\(_2\)), which is a highly visible reddish-brown gas.
Option A is incorrect because passing the gases into lime water (Ca(OH)\(_2\)) cannot completely isolate a single gas. While carbon dioxide (CO\(_2\)) turns lime water milky due to the formation of insoluble calcium carbonate (CaCO\(_3\)), sulphur dioxide (SO\(_2\)) also turns lime water milky by forming an insoluble precipitate of calcium sulfite (CaSO\(_3\)). Therefore, it fails to identify just one gas completely.
Source: Myschool Past Questions Archive (Record #776)
Chemistry
UTME / JAMB 1978
Acids, Bases, pH & Salts
Which of the following substances would you see as an indicator in the titration of sodium carbonate solution against hydrochloric acid (complete neutralisation)?
A
Litmus paper
B
Phenolphthalein
C
Methyl orange
D
Universal indicator
E
None of these
medium Difficulty
Verified Correct Answer: Option C
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option C.
Source: Myschool Past Questions Archive (Record #779)
Chemistry
UTME / JAMB 1978
Atomic Structure, Orbitals & Nuclear Chemistry
Diagram
Solution
Which of the five atoms can be described by the following properties: Relative atomic mass is greater than 30 but less than 40, it has odd atomic number and forms a unipositive ion in solution?
Attached Figure / Diagram
A
T
B
W
C
X
D
Y
E
Z
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
Y = 19 protons, 19 electrons and 20 neutrons.
Y has electronic configuration 2, 8, 8, 1. Hence, it has one valence electron in the outer shell (Valency of +1).
Mass number = protons + neutrons
= 19 + 20
= 39.
Source: Myschool Past Questions Archive (Record #7493)