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Physics
UTME / JAMB 2013
Current Electricity & Electric Circuits
Solution
Calculate the energy of the third level of an atom if the ground state energy is - 24.8eV
A
-9.20eV
B
-8.20eV
C
-2.75eV
D
-1.75eV
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
\(E_3 = \frac{E}{n^2}\)
\(E_3 = \frac{-24.8}{3^2}\)
\(E_3 = 2.75eV\)
Source: Myschool Past Questions Archive (Record #27369)
Physics
UTME / JAMB 2013
Atomic, Quantum, Nuclear Physics & Electronics
The particle nature of light is demonstrated by the
A
photoelectric effect
B
speed of light
C
colours of light
D
diffraction of light
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 #27371)
Physics
UTME / JAMB 2013
Waves, Sound & Vibrations
Solution
The energy of a photo having a wavelength of 10-10m is
(h= 6.63 x 10 -34Js, c =3.0 x 10 8ms-1)
A
2.0 x 10 -15J
B
1.7 x 10 -13J
C
2.0 x 10 -12J
D
1.7 x 10 -12J
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
E = \(\frac{hc}{\lambda}\)
E = \(\frac{6.63 \times 10^{-34} \times 3 \times 10^18}{10^{-10}}\)
E = 2 x 10-15J
Source: Myschool Past Questions Archive (Record #27372)
Physics
UTME / JAMB 2013
Current Electricity & Electric Circuits
The bond between silicon and germanium is
A
dative
B
covalent bond
C
trivalent
D
ionic
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 #27373)
Physics
UTME / JAMB 2013
Current Electricity & Electric Circuits
The bond between silicon and germanium is
A
dative
B
covalent bond
C
trivalent
D
ionic
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: Official Exam / Past Question Archive
Chemistry
UTME / JAMB 2013
Nature of Matter & Separation Techniques
Solution
The presence of an impurity in substance will cause the melting point to
A
be zero
B
reduce
C
increase
D
be stable
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Impurities disrupt the repeating pattern of forces that holds the solid together. So a smaller amount of energy is required to melt the part of the solid surrounding the impurity. If less energy is required, then this explains the melting point depression (lowering) observed from impure solids. The more impure the solid is, the more the structure is disrupted and the greater the variation in intermolecular forces in different areas of the solid.
Source: Myschool Past Questions Archive (Record #27428)
Chemistry
UTME / JAMB 2013
Stoichiometry, Mole Concept & Volumetric Analysis
What volume of carbon (ll) oxide is produced by reacting excess carbon with 10 dm3 of oxygen?
A
5 dm 3
B
20 dm 3
C
15 dm 3
D
10 dm 3
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #27429)
Chemistry
UTME / JAMB 2013
Stoichiometry, Mole Concept & Volumetric Analysis
The radioisotope used in industrial radiography for the rapid checking of faults in welds and casting is
A
carbon-14
B
phosphorus-32
C
cobalt-60
D
iodine-131
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 #27431)
Chemistry
UTME / JAMB 2013
Chemical Bonding & Intermolecular Forces
The shape of the carbon (lV) oxide molecule is
A
pyramidal
B
linear
C
angular
D
tetrahedral
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option B.
Source: Myschool Past Questions Archive (Record #27432)
Chemistry
UTME / JAMB 2013
Chemical Bonding & Intermolecular Forces
Solution
Which of the following molecules is held together by hydrogen bond?
A
CH4
B
HBr
C
H2SO4
D
HF
medium Difficulty
Verified Correct Answer: Option D
Chemical Principles & Mechanism
HF is held by hydrogen bonding.
Source: Myschool Past Questions Archive (Record #27433)
Chemistry
UTME / JAMB 2013
Atomic Structure, Orbitals & Nuclear Chemistry
The bond formed between two elements with electron configurations 1s2 2s2 2p6 3s2 and 1s2 2s2 2p4 is
A
metallic
B
covalent
C
dative
D
ionic
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 #27434)
Chemistry
UTME / JAMB 2013
Periodic Table & Periodicity
The constituent of air that acts as a diluent is
A
nitrogen
B
carbon (IV) oxide
C
noble gases
D
oxygen
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #27435)
Chemistry
UTME / JAMB 2013
Stoichiometry, Mole Concept & Volumetric Analysis
Steam changes the colour of anhydrous cobalt (ll) chloride from
A
white to red
B
blue to white
C
blue to pink
D
white to blue
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 #27436)
Chemistry
UTME / JAMB 2013
Water, Solutions & Solubility
An example of a hygroscopic substance is
A
CuO (S).
B
MgCL2(S).
C
CaCL2(S).
D
NaOH(S).
medium Difficulty
Verified Correct Answer: Option A
Chemical Principles & Mechanism
No expanded working has been attached for this question yet. The verified answer is Option A.
Source: Myschool Past Questions Archive (Record #27437)
Chemistry
UTME / JAMB 2013
Organic Chemistry II: Functional Groups, Polymers & Biomolecules
Solution
The solvent used for removing grease stain is
A
turpentine
B
ammonia solution
C
ethanol
D
solution of borax in water
medium Difficulty
Verified Correct Answer: Option B
Chemical Principles & Mechanism
Ammonia solution (also known as aqueous ammonia or ammonium hydroxide) is frequently used in laundries and household cleaners as a solvent for removing grease and oil stains. It is effective because it reacts with fatty acids in grease to form soluble soaps (a process called saponification) or helps emulsify the oils so they can be washed away with water.
Source: Myschool Past Questions Archive (Record #27439)