# Strength of Materials MCQ Civil Engineering

50 Questions 30 Mins

Following are some of the multiple choice questions on the Strength of Materials with answers that will help the students in developing their knowledge.

## Strength of Materials MCQ

### 1. The algebraic sum of moments of the forces forming couple about any point in their plane is

• equal to the moment of the couple
• constant
• both of above are correct
• both of above are wrong

• k1+k2
• K1+K2/2
• K1K2/K1+K2
• K1+K2/K1K2

### 3. If a number of forces act simultaneously on a particle, it is possible

• Not a replace them by a single force
• To replace them by a single force
• To replace them by a single force through G.
• To replace them by a couple

### 4. The object of caulking in a riveted joint is to make the joint

• free from corrosion
• stronger in tension
• free from stresses
• leak-proof

### 5. Limiting force of friction is the

• Tangent of angle between normal reaction and the resultant of normal reaction and limiting friction
• Ratio of limiting friction and normal reaction
• The friction force acting when the body is just about to move
• The friction force acting when the body is in motion

• zeioth order
• first order
• second order
• third order

### 7. Two coplanar couples having equal and opposite moments

• Balance each other
• Produce a couple and an unbalanced force
• Are equivalent
• Produce a moment of couple

### 8. In determining stresses in frames by methods of sections, the frame is divided into two parts by an imaginary section drawn in such a way as not to cut more than

• Two members with unknown forces of the frame
• Three members with unknown forces of the frame
• Four members with unknown forces of the frame
• Three members with known forces of the frame

• zero
• minimum
• maximum
• infinity

• distributed
• varying

### 11. Whenever a material is loaded within elastic limit, stress is __________ strain.

• equal to
• directly proportional to
• inversely proportional to
• All of above

### 12. When two main plates are kept in alignment butting each other and riveted with cover plate on both sides of the main plates with two rows of rivets in each main plate, the joint is known as __________ double cover butt joint.

• single riveted
• double riveted

### 13. The strain energy stored in a solid circular shaft subjected to shear stress (τ) is (where C = Modulus of rigidity for the shaft material)

• x Volume of shaft
• x Volume of shaft
• x Volume of shaft
• x Volume of shaft

### 14. The stress at which the extension of the material takes place more quickly as compared to the increase in load, is called

• elastic limit
• yield point
• ultimate point
• breaking point

• True
• False

### 16. In a simple bending of beams, the stress in the beam varies

• linearly
• parabolically
• hyperbolically
• elliptically

• same
• double
• four times
• six times

• 0.20
• 0.30
• 0.50
• 0.60

### 19. A concentrated load is one which

• acts at a point on a beam
• spreads non-uniformly over the whole length of a beam
• spreads uniformly over the whole length of a beam
• varies uniformly over the whole length of a beam

### 20. Resilience is the

• energy stored in a body when strained within elastic limits
• energy stored in a body when strained upto the breaking of the specimen
• maximum strain energy which can be stored in a body
• none of the above

• M
• M
• M2
• M3

• True
• False

• True
• False

### 24. When a bar is cooled to - 5°C, it will develop

• no stress
• shear stress
• tensile stress
• compressive stress

• zero
• minimum
• maximum
• infinity

### 26. The bending stress in a beam is __________ section modulus.

• directly proportional to
• inversely proportional to

### 27. In compression test, the fracture in cast iron specimen would occur along

• an oblique plane
• at right angles to the axis of specimen
• would not occur

### 28. The energy stored in a body when strained within elastic limit is known as

• resilience
• proof resilience
• strain energy
• impact energy

• smaller end
• larger end
• middle
• anywhere

• 5/8
• 8/5
• 5/4
• 4/5

### 31. The point of contraflexure is a point where

• shear force changes sign
• bending moment changes sign
• shear force is maximum
• bending moment is maximum

### 32. When a rectangular beam is loaded transversely, the maximum compressive stress is developed on the

• top layer
• bottom layer
• neutral axis
• every cross-section

• x τ x D3
• x τ x D3
• x τ x D3
• x τ x D3

### 34. Strain rosettes are used to

• measure shear strain
• measure linear strain
• measure volumetric strain
• relieve strain

### 35. A thin cylindrical shell of diameter (d) and thickness (t) is subjected to an internal pressure (p). The ratio of longitudinal strain to volumetric strain is

• (m - 1)/ (2m - 1)
• (2m - 1)/ (m - 1)
• (m - 2)/ (3m - 4)
• (m - 2)/ (5m - 4)

• 1/8
• 1/4
• 1/2
• 2

• t
• 2t
• 4t
• 8t

• sum
• difference

• True
• False

• equal to
• less than
• more than
• All of above

### 41. A masonry dam may fail due to

• tension in the masonry of the dam and its base
• overturning of the dam
• crushing of masonry at the base of the dam
• any one of the above

### 42. If the slenderness ratio for a column is 100, then it is said to be a __________ column.

• long
• medium
• short
• None of these

### 43. A thick cylindrical shell having ro and ri as outer and inner radii, is subjected to an internal pressure (p). The maximum tangential stress at the inner surface of the shell is

• [p (r₀² + ri²)] / (r₀² - ri²)
• [p (r₀² - ri²)] / (r₀² + ri²)
• 2pri²/ (r₀² - ri²)
• (r₀² - ri²) / 2pri²

• equal to
• one-half
• twice
• four times

### 45. A steel bar of 5 mm is heated from 15° C to 40° C and it is free to expand. The bar Will induce

• no stress
• shear stress
• tensile stress
• compressive stress

• 400 MPa
• 500 MPa
• 900 MPa
• 1400 MPa

### 47. Euler's formula holds good only for

• short columns
• long columns
• both short and long columns
• weak columns

### 48. Strain energy is the

• energy stored in a body when strained within elastic limits
• energy stored in a body when strained upto the breaking of a specimen
• maximum strain energy which can be stored in a body
• proof resilience per unit volume of a material

### 49. A vertical column has two moments of inertia (i.e. Ixx and Iyy ). The column will tend to buckle in the direction of the

• perpendicular to the axis of load
• maximum moment of inertia
• minimum moment of inertia

### 50. A sample of metal weighs 219 gms in air, 180 gms in water, 120 gms in an unknown fluid. Then which is correct statement about density of metal

• density of metal can’t be determined
• metal is twice as dense as water
• metal will float in water
• metal is twice as dense as unknown fluid