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Mechanical Properties of Solids question bank (Physics)

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Q1.

$A$ and $B$ are two wires. The radius of $A$ is twice that of $B$. They are stretched by the same load. Then the stress on $B$ is

(A)

Equal to that on $A$

(B)

Four times that on $A$

(C)

Two times that on $A$

(D)

Half that on $A$

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Q2.

One end of a uniform wire of length $L$ and weight $W$ is attached rigidly to a point in the roof,and a weight $W_1$ is suspended from its lower end. If $S$ is the area of cross-section of the wire,the stress in the wire at a height $3L/4$ from its lower end is

(A)

$\frac{W_1}{S}$

(B)

$\frac{W_1 + (W/4)}{S}$

(C)

$\frac{W_1 + (3W/4)}{S}$

(D)

$\frac{W_1 + W}{S}$

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