# Strength of Materials Questions and Answers – Strain Energy

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This set of Strength of Materials Multiple Choice Questions & Answers (MCQs) focuses on “Strain Energy”.

1. Resilience can also be termed as ___________
a) Stress energy
b) Strain energy
c) Modulus
d) Tenacity

Explanation: The capability of a material to absorb energy when it is deformed elastically and release that energy upon unloading is known resilience. This resilience is also termed as Strain energy.

2. Mathematically, strain energy = _________
a) Power
b) Work done
c) Young’s Modulus
d) Energy

Explanation: By the principle of work, the amount of strain energy in a body is found. When a load acts on a body there will be deformation, which causes movement of the applied load. This work is done by the applied load.

3. Calculate the Strain energy stored in a body of stress 0.0366 N/mm2. The cross sectional area is 60 m2and length of body is 1 m. Take E = 2×105 N/mm2.
a) 0.2009 N.mm
b) 0.0416 N.mm
c) 0.0987 N.mm
d) 0.1316 N.mm

Explanation: Given that : l = 1000 mm ; A = 60000 mm2; f = 0.0366 N/mm2.
Strain energy stored = f2/2EI × Volume
= (0.0366)2/ 2×2×105× (200×300) × (1000)
= 0 2009 N.mm.

4. What are the units of measurement for wooden and steel trusses?
a) 1 RM
b) 1 N.o
c) m2
d) m

Explanation: The units of measurement for wooden and steel trusses is 1 N.o

Description of Work Units of Measurement
Earth work excavation 1 m3
Steel reinforcement 1 kN
Wooden and steel trusses 1 No
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5. Which of the following methods is also known as individual wall method?
a) Centre line method
b) Alignment method
c) Long wall and short wall method
d) Voluminous method

Explanation: Long wall short wall method is tedious and long lasting. In this method, the length of wall running in one direction are measured first out to out and that of running in the perpendicular direction are measured in to in.

6. Centre line method is accurate method.
a) False
b) True

Explanation: The estimates can be prepared quickly by using center line method. This is not only an accurate method but also a very quick method.

7. _______ gives the nature and class of work.
a) Estimate
b) Specifications
c) Tenders
d) Survey

Explanation: Drawings cannot give every information about materials and quality. The specifications give the nature and class of work, quantity of materials and workmanship. They are very useful during the execution of work.

8. In foundation concrete, coarse aggregate size should be __________
a) 20 mm
b) 30 mm
c) 40 mm
d) 50 mm

Explanation: Generally foundation concrete is laid about thickness of 30 cm with proportion 1:4:8 (or) 1:5:10 and are measured in m3.
Before laying the concrete bed level, sand filling and sinking must be done and checked properly.

9. What is the painting coefficient for flush doors?
a) 2.3
b) 2.4
c) 3.4
d) 3.6

Explanation: The painting coefficient for flush doors is 2.4.

Description Multiplying Factor of Paint Coefficient
Fully glazed doors 1.6
Fully ventilated doors 3.6
Flush doors 2.4

10. Which of the following rules is known as “Prismoidal Rule”?
a) Mean sectional rule
b) Trapezoidal rule
c) Simpson’s rule
d) Mid sectional rule

Explanation: Prismoidal rule is used when the shape of the solid between two parallel cross sections is in the shape of a prismoid. This is also known as Simpsons rule volume is calculated by
V = L/6 (A1 + 4A + A2).

11. Which of the following estimates is also known as a preliminary estimate?
a) Detailed estimate
b) Scientific estimate
c) Approximate estimate
d) Abstract estimate

Explanation: An approximate estimate is prepared to decide whether the funds available for the proposal is sufficient or not. The estimate is accompanied by a detailed report explaining the necessity and utility of the proposal.

12. Service unit method is related to ___________ estimate.
a) Abstract
b) Approximate
c) Detailed
d) Cubic content

Explanation: There are over a number of methods available for preparing approximate estimate but the following methods are important
i. Plinth area method
ii. Cubic content method
iii. Service unit method.

13. By ___________ estimate, a technical sanction is obtained.
a) Approximate
b) Detailed
c) Abstract
d) Preliminary

Explanation: Detailed estimate is required for arranging the contract and entering into the agreement. In this estimate, the quantities are worked out in the order in which construction proceeds. For getting technical sanction, the detailed estimate is prepared.

14. Which of the following is an exact estimate?
a) Abstract
b) Detailed
c) Rough
d) Preliminary

Explanation: In a detailed estimate, the quantities of each item of work such as earth excavation, bed concrete and brick masonry are calculated. Detailed drawings are required for this estimate.

15. Calculate the instantaneous elongation if a steel rod of 40 mm and 4 m long subjected to an axial pull of 80 kN. Take E = 2×105 N/mm2.
a) 1.23 mm
b) 1.27 mm
c) 1.31 mm
d) 1.43 mm

Explanation: An instantaneous elongation = f/A × L ; and f = P/A = 80000/1256.63 = 63.66 N/mm2.
= 63.66/1256.63 × 4000
= 1.27 mm.

Sanfoundry Global Education & Learning Series – Strength of Materials.

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