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Physics
UTME / JAMB 2011
Heat Energy & Temperature
Solution
A copper wire was subjected to a tensile stress of 7.7 x 10\(^7\). Calculate the strain of the wire.
[Young modules = 1.1 x 10\(^11\) Nm\(^{-2}\)]
A
2. 0 x 10-5
B
7.0 x 10-3
C
7.0 x 10-4
D
2.2 x 10-4
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Young modules = \( \frac{\text{Tensile stress}}{\text{Tensile strain}}\)
= \( 1.1 \times 10^11 = \frac{7.7 \times 10^7}{\text{Tensile Strain}} \)
∴ Tensile strain = \( \frac{7.7 \times 10^7}{1.1 \times 10^{11}} \)
= \( 7.0 \times 10^{7-11}
= 7.0 \times 10^{-4} \)
Source: Myschool Past Questions Archive (Record #14379)
Physics
UTME / JAMB 2011
Heat Energy & Temperature
Solution
Which of the following could be effectively used to reduce friction?
A
kerosene
B
grease
C
water
D
petrol
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
grease is more viscous than the rest of the liquids
Source: Myschool Past Questions Archive (Record #14393)
Physics
UTME / JAMB 2011
Heat Energy & Temperature
Solution
The eclipse of the sun occurs when the
A
moon is between the sun and the earth
B
earth is between the sun and the moon
C
moon is not completely hidden in the earth's shadow
D
moon's umbra falls on some part of the earth
medium Difficulty
Verified Correct Answer: Option A
Physical Principles & Numerical Solution
Eclipse of the sun occurs when the moon which is opaque objects between the sun and the earth
Source: Myschool Past Questions Archive (Record #14460)
Physics
UTME / JAMB 2011
Heat Energy & Temperature
Solution
Which of the following is a property of steel?
A
it cannot retain its magnetism longer than iron
B
it can be used for making temporary magnets
C
it can be used for making permanent magnets
D
it can easily be magnetized and demagnetized
medium Difficulty
Verified Correct Answer: Option C
Physical Principles & Numerical Solution
Steel is not easily magnetized and dismagnetized
Source: Myschool Past Questions Archive (Record #14461)
Physics
UTME / JAMB 2011
Heat Energy & Temperature
The bond between silicon and germanium is
A
covalent
B
ionic
C
dative
D
electrovalent
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 #14467)
Physics
UTME / JAMB 2011
Heat Energy & Temperature
Solution
Which of the following will be applied when a metal Y is used to electroplate another metal X in electrolysis?
A
X is the anode and very high current is used
B
X is the anode and Y is the cathode
C
Y is the cathode and X is the anode
D
Y is the anode and very high current is used
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
Metals and hydrogen are deposited at the cathode, while non-metals and oxygen are deposited on the anode
∴ metals Y will form the anode which is deposited at the cathode made of x
Source: Myschool Past Questions Archive (Record #14472)
Physics
UTME / JAMB 2011
Heat Energy & Temperature
Solution
Two resistors 5Ω and 10Ω are arranged first in series and later in parallel to a 24V source, the ratio of total power dissipated in the series and parallel arrangements respectively is
A
5:3
B
1:50
C
50:1
D
3:5
E
No Correct Option
medium Difficulty
Verified Correct Answer: Option E
Physical Principles & Numerical Solution
Power in Series Arrangement
Total Resistance (R_series): R\(_{series}\) = R\(_1\) + R\(_2\) = 5Ω + 10Ω = 15Ω
Total Power (P_series): P = \(\frac{V^2}{\text{R}}\) = \(\frac{24^2}{15}\) = 38.4W
Power in parallel Arrangement
Total Resistance(R\(_{parallel}\)): R\(_{parallel}\) = \(\frac{R_1 \times R_2}{R_1 + R_2}\) = \(\frac{5 \times 10}{5 + 10}\) = 3.33
Total Power(P_{parallel}\): P = \(\frac{V^2}{\text{R}}\) = \(\frac{24^2}{3.33}\) = 172.8W
Ratio of Powers
Power ratio = \(\frac{\text{Pseries}}{\text{Pparallel}}\) = \(\frac{38.4}{172.8}\) = \(\frac{1}{4.5}\) = \(\frac{2}{9}\)
Therefore, there is no correct answer.
Source: Official Exam / Past Question Archive
Physics
UTME / JAMB 2011
Heat Energy & Temperature
Diagram
Solution
The diagram above shows two vectors at right angles to each other. The value of the resultant vector is
Attached Figure / Diagram
A
14.0 N
B
10.0 N
C
12.0 N
D
13.0 N
medium Difficulty
Verified Correct Answer: Option B
Physical Principles & Numerical Solution
The resultant, R is given by pythagoras rule, R2 = P2 + Q2
= 62 + 82 = 36 + 64 = 100
R = √100 = 10.0N
Source: Myschool Past Questions Archive (Record #14521)
Physics
WAEC / WASSCE 2011
Heat Energy & Temperature
Which of the following statements is not correct?
A
molecules of ice, water and water vapour have equal intermolecular distances
B
molecules of ice, water and water vapour do not differ in the structure of their molecules
C
molecules of water vapour attract each other with forces far less than the forces of attraction between water molecules
D
water is less compressible than water vapour
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 #35373)
Physics
WAEC / WASSCE 2011
Heat Energy & Temperature
The property of a fluid that is used to determine its suitability as a lubricant is its
A
capillarity
B
viscocity
C
surface tension
D
relative density
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 #35411)
Physics
WAEC / WASSCE 2011
Heat Energy & Temperature
Solution
A body of mass 120g placed at the 10cm mark on a uniform metre rule makes the rule settle horizontally on a fulcrum places at 35cm mark. Calculate the mass of the rule
A
60g
B
80g
C
120g
D
200g
medium Difficulty
Verified Correct Answer: Option D
Physical Principles & Numerical Solution
m = \(\frac{25 \times 120}{15}\)
= 200g
Source: Myschool Past Questions Archive (Record #35434)
Physics
WAEC / WASSCE 2011
Heat Energy & Temperature
Which of the following statements correctly defines a simple machine? A device
A
that can produce electric current
B
which can only carry people from one place to another
C
with which work can be done easily
D
which changes the state of rest or of uniform motion of an object
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 #35441)
Physics
WAEC / WASSCE 2011
Heat Energy & Temperature
A hypsometer is used for determining
A
steam point
B
relative humidity
C
ice point
D
relative density
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 #35443)
Physics
WAEC / WASSCE 2011
Heat Energy & Temperature
Ether produces a cooling effect when it is poured on the hand because it has
A
low conductivity
B
high conductivity
C
high latent heat of vaporization
D
low latent heat of vaporization
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 #35455)
Physics
WAEC / WASSCE 2011
Heat Energy & Temperature
Presbyopia is a defect of the eye resulting from
A
weak ciliary muscles
B
short eyeball
C
loss of sphericity of the lens
D
long eyeball
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 #35474)