STRENGTH OF MATERIAL MCQ SET 6
Q1. When a beam is subjected to bending, the top fibers are usually in:
A) Compression
B) Tension
C) Shear
D) Neutral condition
Answer: A) Compression
Explanation: In a simply supported beam, the top fibers are compressed while the bottom fibers are under tension.
Q2. The line along which there is no stress or strain in bending is called:
A) Axis of beam
B) Neutral axis
C) Center of gravity
D) Shear center
Answer: B) Neutral axis
Explanation: The neutral axis divides the beam section into tension and compression zones.
Q3. The bending stress in a beam is maximum at:
A) Neutral axis
B) Top and bottom fibers
C) Mid-depth
D) Center of gravity
Answer: B) Top and bottom fibers
Explanation: Bending stress varies linearly, becoming maximum at the extreme fibers.
Q4. Bending stress is directly proportional to:
A) Radius of curvature
B) Bending moment
C) Moment of inertia
D) None of these
Answer: B) Bending moment
Explanation: Formula: ฯ = M*y/I, where M is the bending moment.
Q5. A beam supported at both ends and loaded in the middle is called:
A) Cantilever beam
B) Simply supported beam
C) Fixed beam
D) Overhanging beam
Answer: B) Simply supported beam
Explanation: It is one of the most common beam configurations used in analysis.
Q6. The slope of the shear force diagram at any point gives:
A) Load intensity
B) Bending moment
C) Deflection
D) Shear stress
Answer: A) Load intensity
Explanation: The derivative of shear force gives load intensity: w = dV/dx.
Q7. The slope of the bending moment diagram gives:
A) Shear force
B) Load intensity
C) Deflection
D) Strain
Answer: A) Shear force
Explanation: dM/dx = V, hence the slope of bending moment diagram equals shear force.
Q8. The point where bending moment is zero and shear force changes sign is called:
A) Point of zero shear
B) Point of contraflexure
C) Neutral point
D) Critical point
Answer: B) Point of contraflexure
Explanation: It is where bending moment changes its nature from positive to negative.
Q9. The ratio of bending stress to shear stress in a beam depends on:
A) Shape of cross-section
B) Type of loading
C) Both A and B
D) None
Answer: C) Both A and B
Explanation: The stress distribution varies with both geometry and loading condition.
Q10. A shaft is subjected to torque only. The type of stress induced is:
A) Tensile stress
B) Compressive stress
C) Shear stress
D) Bending stress
Answer: C) Shear stress
Explanation: Pure torsion causes only shear stresses on the shaft surface.
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