NEET UG 2025 · Physics · Question 23
NEET 2025 Physics, question 23
Question 23 of the NEET 2025 paper (code 45) is a Physics question from Oscillations. Its idea, Oscillator with Changing Mass, was asked only this once in NEET 2017–2026. The NTA final answer key gives option 2.
Updated 2026-10-08
Q23 · Physics
In an oscillating spring mass system, a spring is connected to a box filled with sand. As the box oscillates, sand leaks slowly out of the box vertically so that the average frequency and average amplitude of the system change with time . Which one of the following options schematically depicts these changes correctly?
The figure, described in words
Each option is a pair of sketch graphs of omega(t) and A(t) versus t (see options).
- 1[graphs: increasing and saturating; constant]
- 2[graphs: increasing and saturating; decreasing]Official answer
- 3[graphs: increasing and saturating; increasing and saturating]
- 4[graphs: decreasing; decreasing]
Official answer: option 2 · NTA final answer key
Same idea
The only question on Oscillator with Changing Mass
No other NEET paper from 2017–2026 tested this exact idea.
Oscillator with Changing Mass: every question and how it was framed
The chapter
Oscillations in ten years of NEET
17 questions from 2017–2026, asked in 10 of 10 papers, about 1.6 a paper. Simple Harmonic Motion alone had 16.