Engineering Questions with Answers - Multiple Choice Questions

# Strength of Materials (MCQs) focuses on “Strain”

1 - Question

What is the moment of inertia of a circular section?
a) πD4/64
b) πD3/32
c) πD3/64
d) πD4/32
Explanation: The moment of inertia of a circular section is πD4/64.

2 - Question

What is the moment of inertia of a rectangular section about an horizontal axis through C.G?
a) bd3/6
b) bd2/12
c) b2d2/12
d) bd3/12
Explanation: The moment of inertia of a rectangular section about an horizontal axis through C.G is bd3/12.

3 - Question

What is the moment of inertia of a rectangular section about an horizontal axis passing through base?
a) bd3/12
b) bd3/6
c) bd3/3
d) bd2/3
Explanation: The moment of inertia of a rectangular section about an horizontal axis passing through base is bd3/3.

4 - Question

What is the moment of inertia of a triangular section about the base?
a) bh2/12
b) bh3/12
c) bh3/6
d) bh2/6
Explanation: The moment of inertia of a triangular section about the base is bh3/12.

5 - Question

What is the moment of inertia of a triangular section about an axis passing through C.G. and parallel to the base?
a) bh3/12
b) bh3/24
c) bh3/36
d) bh3/6
Explanation: The moment of inertia of a triangular section about an axis passing through C.G. and parallel to the base is bh3/36.

6 - Question

What will be the moment of inertia of a circle in cm4 of diameter is 10cm?
a) a340
b) 410
c) 460
d) 490
Explanation: The moment of inertia of a circle is = πD4/64 = 491.07 cm4.

7 - Question

What will be the moment of inertia of the given rectangle about an horizontal axis passing through the base?<br/>

a) 1500 mm4<br/>
b) 1650 mm4<br/>
c) 1666 mm4<br/>
d) 1782 mm4

Explanation: The moment of inertia of a rectangular section about an horizontal axis through C.G = bd3/12 = 5x10x10x10/12 = 416.67 mm4.

8 - Question

What will be the moment of inertia of the given triangle about the base?<br/>

a) 350 mm4<br/>
b) 379mm4<br/>
c) 416mm4<br/>
d) 500mm4

Explanation: The moment of inertia of a rectangular section about an horizontal axis through C.G = bd3/12 = 5x10x10x10/12 = 416.67 mm4.

9 - Question

What will be the moment of inertia of the given triangle about the base?<br/>

a) 20.33 mm4<br/>
b) 21.33 mm4<br/>
c) 24.33 mm4<br/>
d) 22.33 mm4

Explanation: The moment of inertia of a triangular section about the base = bh3/12. = 4x4x4x4/12 = 21.33 mm4.

10 - Question

What will be the moment of inertia of the given triangle about an axis passing through C.G and parallel to base?<br/>

a) 6.1 mm4<br/>
b) 7.1 mm4<br/>
c) 8.1 mm4<br/>
d) 7.56 mm4

Explanation: The moment of inertia of a triangular section about an axis passing through C.G. and parallel to the base = bh3/36. = 4x4x4x4/36 = 7.11 mm4.

11 - Question

What will be the difference between MOI of two triangle sections is in 1st, MOI is taken about its base and in 2nd MOI is taken about its centroid?
a) bh3/12
b) bh3/18
c) bh3/36
d) bh3/24