Physics · 2025
JEE Main · 2 April 2025, Shift 2 · Q48
The length of a light string is 1.4 m when the tension on it is 5 N. If the tension increases to 7 N, the length of the string is 1.56 m. The…
The length of a light string is $\displaystyle 1.4$ m when the tension on it is $\displaystyle 5$ N . If the tension increases to $\displaystyle 7$ N , the length of the string is $\displaystyle 1.56$ m . The original length of the string is $\displaystyle \_\_\_\_$ m.
Official answer
From NTA’s final answer key for this paper.
1
More from Mechanical Properties of Solids
- Two slabs with square cross section of different materials (1,2) with equal sides (l) and thickness d_1 and d_2 such that d_2=2 d_1 and l>d_2.…2025
- A massless spring gets elongated by amount x_1 under a tension of 5 N. Its elongation is x_2 under the tension of 7 N. For the elongation of (5 x_1-2…2025
- A cube has side length 5 cm and modulus of rigidity 10^5 N / m^2. The displacement produced by a force of 10 N in the upper face of cube is ____ mm.2026
- A lift of mass 1600 kg is supported by thick iron wire. If the maximum stress which the wire can withstand is 4 × 10^8 N / m^2 and its radius is 4…2026
- Figure represents the extension ( Δ l ) of a wire of length 1 meter, suspended from the ceiling of the room at one end with a load W connected to the…2026
- Two wires A and B made of different materials of lengths 6.0 cm and 5.4 cm, respectively and area of cross sections 3.0 × 10^-5 m^2 and 4.5 × 10^-5…2026
- A uniform wire of length l of weight w is suspended from the roof with a weight of W at the other end. The stress in the wire at l/3 distance from…2026
- A 3 m long wire of radius 3 mm shows an extension of 0.1 mm when loaded vertically by a mass of 50 kg in an experiment to determine Young's modulus.…2025
JEE Main 2025 Physics question, with the answer from NTA’s final answer key. Where our answers come from.