Properties of Matter - Mechanical Properties of Solids
Q. If the length of a wire is doubled while keeping the diameter constant, what happens to its resistance? (2019)
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A.
It doubles
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B.
It halves
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C.
It quadruples
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D.
It remains the same
Solution
Resistance (R) is directly proportional to length (L). If length is doubled, resistance also doubles.
Correct Answer: A — It doubles
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Q. What happens to the density of a material when it is compressed? (2019)
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A.
It decreases
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B.
It increases
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C.
It remains the same
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D.
It becomes zero
Solution
Density increases when a material is compressed, as mass remains constant while volume decreases.
Correct Answer: B — It increases
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Q. What is the bulk modulus of a material if a pressure increase of 50 MPa results in a volume decrease of 0.02 m³ for a volume of 1 m³? (2022)
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A.
2500 MPa
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B.
500 MPa
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C.
1000 MPa
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D.
2000 MPa
Solution
Bulk modulus (K) = -ΔP / (ΔV/V) = 50 MPa / (0.02 m³ / 1 m³) = 2500 MPa.
Correct Answer: A — 2500 MPa
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Q. What is the Poisson's ratio for a material that experiences a lateral strain of 0.02 when subjected to a longitudinal strain of 0.01? (2023)
Solution
Poisson's ratio (ν) = Lateral strain / Longitudinal strain = 0.02 / 0.01 = 2.
Correct Answer: A — 0.5
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Q. What is the shear modulus of a material if a shear stress of 100 MPa produces a shear strain of 0.05? (2021)
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A.
2000 MPa
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B.
500 MPa
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C.
1000 MPa
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D.
1500 MPa
Solution
Shear modulus (G) = Shear stress / Shear strain = 100 MPa / 0.05 = 2000 MPa.
Correct Answer: A — 2000 MPa
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Q. What is the Young's modulus of a material if a stress of 200 MPa produces a strain of 0.01? (2021)
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A.
2000 MPa
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B.
20 MPa
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C.
200 MPa
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D.
2 MPa
Solution
Young's modulus (E) = Stress / Strain = 200 MPa / 0.01 = 20000 MPa = 2000 MPa.
Correct Answer: A — 2000 MPa
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Q. Which of the following factors does NOT affect the tensile strength of a material? (2022)
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A.
Temperature
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B.
Material composition
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C.
Length of the specimen
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D.
Cross-sectional area
Solution
The length of the specimen does not affect tensile strength; it is an intrinsic property of the material.
Correct Answer: C — Length of the specimen
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Q. Which of the following is a characteristic of brittle materials? (2020)
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A.
High ductility
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B.
Low tensile strength
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C.
Low elasticity
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D.
Fracture without significant deformation
Solution
Brittle materials fracture without significant deformation.
Correct Answer: D — Fracture without significant deformation
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Q. Which of the following materials has the highest tensile strength? (2020)
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A.
Steel
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B.
Aluminum
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C.
Copper
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D.
Rubber
Solution
Steel has the highest tensile strength among the given materials.
Correct Answer: A — Steel
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Q. Which property of a material describes its ability to return to its original shape after deformation? (2023)
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A.
Plasticity
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B.
Elasticity
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C.
Ductility
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D.
Brittleness
Solution
Elasticity is the property that allows a material to return to its original shape after deformation.
Correct Answer: B — Elasticity
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