Civil Engineering - UPSC Civil Service Exam Questions

46. 

The rigid portal frame shown in the given figure will not have any sidesway if
I1 = the moment of inertia of the column cross-section
I2 = the moment of inertia of the beam cross-section

A. it is subjected to vertical loading only
B. I2 = 2I1
C. the loading is symmetrical about its centre line
D. loaded in any manner.

Answer: Option C

Explanation:

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47. 

Two similar round bars A and B are each 30 cm long as shown in the given figure. The ratio of the energies stored by the bars A and B, is

A. 3/2
B. 1.0
C. 5/8
D. 2/3

Answer: Option A

Explanation:

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48. 

Consider the following statements :
The effect of air entrainment in concrete is to
1. increase resistance to freezing and thawing.
2. improve workability.
3. decrease strength.
Which of these statements are correct ?

A. 2 and 3
B. 1 and 3
C. 1 alone
D. 1, 2 and 3

Answer: Option D

Explanation:

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49. 

The state of stress at a point in a stressed element is shown in the given figure. The maximum tensile stress in the element will be

A. 20 N/mm2
B. lO2 N/mm2
C. 10 N/mm2
D. zero

Answer: Option A

Explanation:

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50. 

The shear modulus of a material is half of its Young's modulus. What is the value of its Poisson's ratio ?

A. - 1
B. - 0.5
C. Zero
D. 0.5

Answer: Option C

Explanation:

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