MCQ
A thermo-dynamical system is changed from state $\left(P_1, V_1\right)$ to $\left(P_2, V_2\right)$ by two different process. The quantity which will remain same will be
- A$\Delta Q$
- B$\Delta W$
- C$\Delta Q+\Delta W$
- ✓$\Delta Q-\Delta W$
✓
Answer
Correct option: D.
$\Delta Q-\Delta W$
(d) Change in internal energy does not depend upon path so $\Delta U=\Delta Q-\Delta W$ remain constant.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The intensity level due to two waves of the same frequency in a given medium are $1\ \mathrm{ bel}$ and $5 \ \mathrm{bel}$. Then the ratio of amplitudes is
→The gas law $\frac{P V}{T}=$ constant is true for
→If a current of $10 \mathrm{~A}$ flows in one second through a coil, and the induced e.m.f. is $10 V$, then the self-inductance of the coil is
→What should be the velocity of earth due to rotation about its own axis so that the weight at equator become $3 / 5$ of initial value. Radius of earth on equator is $6400 \mathrm{~km}$
→In the circuit given below, the value of the current is
Two racing cars of masses $m_1$ and $m_2$ are moving in circles of radii $r_1$ and $r_2$ respectively. Their speeds are such that each makes a complete circle in the same duration of time $t$. The ratio of the angular speed of the first to the second car is
→If the length of a closed organ pipe is $1 \mathrm{~m}$ and velocity of sound is $330 \mathrm{~m} / \mathrm{s}$, then the frequency for the second note is
→Two speakers connected to the same source of fixed frequency are placed $2.0 \mathrm{~m}$ apart in a box. A sensitive microphone placed at a distance of $4.0 \mathrm{~m}$ from their midpoint along the perpendicular bisector shows maximum response. The box is slowly rotated until the speakers are in line with the microphone. The distance between the midpoint of the speakers and the microphone remains unchanged. Exactly five maximum responses are observed in the microphone in doing this. The wavelength of the sound wave is
→A heater coil is cut into two parts of equal length and one of them is used in the heater. The ratio of the heat produced by this half coil to that by the original coil is
A cylinder of mass $10 \mathrm{~kg}$ is sliding on a plane with an initial velocity of $10 \mathrm{~m} / \mathrm{s}$. If coefficient of friction between surface and cylinder is 0.5 , then before stopping it will describe
→