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Physics
UTME / JAMB 1981
Current Electricity & Electric Circuits
Diagram
The wave motion above has a frequency
Attached Figure / Diagram
A
0.1Hz
B
0.2Hz
C
5Hz
D
10Hz
E
100Hz
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 #41617)
Physics
UTME / JAMB 1981
Lenses & Optical Instruments
Diagram
Solution
in a light experiment with a convex lens a student plotted a graph as shown above of the reciprocal of object distance (1)/u against the reciprocal of image distance (1)/v . the focal length of the lens is given as
Attached Figure / Diagram
A
slope of line PQ
B
Reciprocal of either OP or OQ
C
Length OP or OQ
D
area under the graph E ratio OP/OQ
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The intercept on either of the axes of the graph of \(\frac{1}{u}\) against \(\frac{1}{v}\) gives the value of \(\frac{1}{f}\). Hence, the reciprocal of this intercecpt gives the value of the focal length.
Source: Myschool Past Questions Archive (Record #41618)
Chemistry
UTME / JAMB 1981
Stoichiometry, Mole Concept & Volumetric Analysis
When a bottle of Coca-Cola is opened, bubbles of evolve. The gas is?
A
hydrogen
B
carbon monoxide
C
carbon dioxide
D
sulphur oxide
E
chlorine
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 #13944)
Chemistry
UTME / JAMB 1981
Organic Chemistry I: Hydrocarbons & Crude Oil
Solution
When glowing splint is inserted into the mouth of a jar containing a gas, the splint is extinguished. The gas gives a white precipitate when passing into barium hydroxide. The gas is?
A
methane
B
hydrogen chloride
C
hydrogen
D
nitrogen
E
carbondioxide
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
Co2 does not support combustion, it is used in fire extinguishers and when it is passed into a solution of barium hydroxide, a white precipitate of barium carbonate is formed
Source: Myschool Past Questions Archive (Record #13946)
Chemistry
UTME / JAMB 1981
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
An example of a strong electrolyte is?
A
ethyl acetate
B
ethanol
C
glucose
D
sodium formate
E
formic acid
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #13947)
Chemistry
UTME / JAMB 1981
Oxidation, Reduction & Redox Reactions
The oxidation number of manganese in KMnO4 is?
A
+1
B
+3
C
+5
D
+7
E
+2
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #13949)
Chemistry
UTME / JAMB 1981
Organic Chemistry I: Hydrocarbons & Crude Oil
Methane is member of the homologous series called?
A
alkenes
B
alcohols
C
esters
D
alkanes
E
alkynes
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #13950)
Chemistry
UTME / JAMB 1981
Metals, Transition Elements & Extraction
For iron to rust, there should be present?
A
oxygen
B
moisture
C
carbondioxide
D
oxygen and moisture
E
oxygen, moisture and carbondioxide
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #13951)
Chemistry
UTME / JAMB 1981
Atomic Structure, Orbitals & Nuclear Chemistry
The mass number of an atom is?
A
the number of electrons in the atom
B
the number of protons in the nucleus of the atom
C
the number of neutrons in the nucleus of the atom
D
the sum of numbers of electrons and protons inthe atom
E
the sum of numbers of proton and neutrons in the nucleus of the atom
medium Difficulty
Verified Correct Answer: Option E
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option E.
Source: Myschool Past Questions Archive (Record #13952)
Chemistry
UTME / JAMB 1981
Periodic Table & Periodicity
Solution
Sodium and potassium belong to the same group of the Periodic Table. This is because?
A
both are metals
B
both are soft and lighter than water
C
both form cations by losing electrons
D
both have identical electronic configuration
E
both react with water vigorously
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
\(_{11}\)Na = 2 8 1
\(_{19}\)K = 2 8 8 1
Both have one electron in their outermost shell( similar electronic configuration). hence they are found in the same group of the periodic table. They both lose an electron to form cations but that is not the reason why they are in group one.
Source: Myschool Past Questions Archive (Record #13953)
Chemistry
UTME / JAMB 1981
Stoichiometry, Mole Concept & Volumetric Analysis
Solution
the number of atoms in one mole of a substance is equal to?
A
the atomic number
B
the avogadro number
C
the gas constant
D
the number of neutrons
E
the number of electrons
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Avogadro's number is defined as the number of elementary particles (molecules, atoms, compounds, etc.) per mole of a substance.
Source: Myschool Past Questions Archive (Record #13956)
Chemistry
UTME / JAMB 1981
Chemical Bonding & Intermolecular Forces
Which of the following statements is NOT true of electrovalent compounds?
A
They are solids
B
They do not vaporized easily
C
They usually dissolve in water
D
The elements forming the compounds normally have their valency electrons in a shared state
E
They conduct electricity
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option D.
Source: Myschool Past Questions Archive (Record #13958)
Chemistry
UTME / JAMB 1981
Oxidation, Reduction & Redox Reactions
If concentrated sulphric acid is added to sugar and warmed gently, the sugar changes from white to brown and finally to a black mas of carbon. In this reaction, concentrated sulphuric acid is acting as ?
A
a drying agent
B
an oxidizing agent
C
a dehydrated agent
D
a reducing agent
E
a hydrolysing agent
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 #13959)
Chemistry
UTME / JAMB 1981
Oxidation, Reduction & Redox Reactions
In the reaction
C + 2HNO3 → CO2 + NO2 + NO + H2O nitric acid is acting as?
A
a reducing agent
B
a nitrating agent
C
an oxidizing agent
D
a catalytic agent
E
a neutralizing agent
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 #13961)
Chemistry
UTME / JAMB 1981
Electrolysis & Electrochemical Cells
Solution
Which of the following processes takes place during electrolysis?
A
Positive ions are discharged at the anode bby gaining sufficient electrons to become neutral
B
Negative ions are dicharged at the anode by gaining suficient electrons to become neutral
C
Positive ions are discharged at the anode by losing sufficient electrons to become neutral
D
Negative ions are discharge at the anode by losing sufficient electrons to become neutral
E
Nothing happens
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
During electrolysis, Negative ions are discharged at the anode by losing sufficient electrons to become neutral, and positive ions are discharged at the cathode by gaining sufficient electrons to become neutral.
Source: Myschool Past Questions Archive (Record #13965)