A tensile load of 100kN is gradually applied to a rectangular bar of dimension 2cmx4cm and length of 5m. What will be the strain energy in the bar if E=1Ã—105 N/mmÂ²?

Civil Engineering : Strength of Materials - Quiz(MCQ)

634 N-m

245.5 N-m

312.5 N-m

314500 N-mm

Correct Answer : 312.5 N-m

Explanation : Stress = load / area = 100,000/ (20×40) = 125 N/mm²

Strain energy = σ²V/2E = 125x125x20x40x5000/ (2×100,000) = 312500 N-mm = 312.5N-m.

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The structures constructed along are distributaries are called as _______

Inlets

Outlets

Channels

Distributaries

Correct Answer : Option (B) : Outlets

Explanation : An outlet is a simple and small irrigation structure which is constructed along the distributaries. The amount of water that is withdrawn through the outlet is in proportion to the area that is irrigated below respective point.

The upstream slope recommended for sand and gravel with RCC core wall is ______

2.5:1

1:2

3:1

1.5:1

Correct Answer : Option (A) : 2.5:1

Explanation : According to Terazghi, the following upstream slopes should be recommended.

1. Homogeneous well graded – 2.5 : 1
2. Homogeneous coarse silt – 3 : 1
3. Sand and gravel with RCC core wall – 2.5 : 1.

Major distributaries discharge varies from _______

0.25 to 5 cumecs

2 to 4 cumecs

1.5 to 5 cumecs

1.2 to 5 cumecs

Correct Answer : Option (A) : 0.25 to 5 cumecs

Explanation : The major distributary takes off from a branch canal to distribute the water to various parts of the field. The supply of the water varies from 0.25 to 5 cumecs.