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SOLUTIONS OF THE MIDTERM EXAM
__________________________________________
AUTUMN SEMESTER 2011
SUBJECT NAME
:
MECHANICS OF SOLIDS
SUBJECT NO
:
48331
DAY/DATE
:
WEDNESDAY, 20
th
APRIL 2011
TIME ALLOWED
:
2 Hours 30 Min
START/END TIME
:
9:00 am – 11:30 am
NOTES/INSTRUCTIONS TO CANDIDATES
:
There are
six (6)
questions.
All
questions are to be attempted
. Show your work clearly.
The value of each question is as indicated on the question paper.
THIS IS A CLOSED BOOK EXAMINATION.
Nonprogrammable calculators and drawing instruments may be used.
Formulas are listed on the last page.
Write your tutor’s name on the answer booklet.
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Question 1  Multiple choice (Total 30 Marks)
Write your choices
on the solution booklet.
For example write “Question 2.7Answer (e)”.
1.1
 Referring to the figure below, at which point or points is the bending moment zero? (6 Marks)
(a)
A, C and D
(b)
A and B
(c)
A and D
(d)
B and C
1.2 – Which of the following is a true statement? (6 Marks)
(a)
For a beam under bending moment, the normal strain distribution is linear across the section of the
beam only when
the material is elastic.
(b)
For a beam under bending moment, the normal strain distribution is linear across the section of the
beam only when
the crosssection is uniform (not composite).
(c)
For a beam under pure bending moment, shear stress distribution on a rectangular section of the beam
is linear across the section.
(d)
For a beam under bending moment, the normal strain distribution is linear across the section of the
beam even if the material is not elastic.
1.3  Which of the following is not
a true statement? (6 Marks)
(a) The forces on the rigidbody may cause rotation of the body if net moment of forces about any
arbitrary point is not zero.
(b) The forces acting on the rigidbody automatically satisfy moment equilibrium
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