- 1(current)
Q. No.A wire is suspended from the ceiling and stretched under the action of a weight \(F\) suspended from its other end. The force exerted by the ceiling on it is equal and opposite to the weight.
| (a) | Tensile stress at any cross-section \(A\) of the wire is \(F/A.\) |
| (b) | Tensile stress at any cross-section is zero. |
| (c) | Tensile stress at any cross-section \(A\) of the wire is \(2F/A.\) |
| (d) | Tension at any cross-section \(A\) of the wire is \(F.\) |
The correct statements are:
1. (a), (b)
2. (a), (d)
3. (b), (c)
4. (a), (c)
A rod of length \(l\) and negligible mass is suspended at its two ends by two wires of steel (wire \(A\)) and aluminium (wire \(B\)) of equal lengths (figure). The crosse-sectional areas of wires \(A\) and \(B\) are \(1.0~\text{mm}^2\) and \(2.0~\text{mm}^2\) respectively. \((Y_{\text{Al}}=70\times10^9~\text{N/m}^2\) and \(Y_{\text{steel}}=200\times10^9~\text{N/m}^2)\)
| (a) | Mass \(m\) should be suspended close to wire \(A\) to have equal stresses in both wires. |
| (b) | Mass \(m\) should be suspended close to \(B\) to have equal stresses in both wires. |
| (c) | Mass \(m\) should be suspended in the middle of the wires to have equal stresses in both wires. |
| (d) | Mass \(m\) should be suspended close to wire \(A\) to have equal strain in both wires. |
The correct statements are:
1. (b, c)
2. (a, d)
3. (b, d)
4. (c, d)
- 1(current)
Q. No.
© 2024 GoodEd Technologies Pvt. Ltd.