Discussion
Match List I with List II
| List I | List II |
|---|---|
| a. Euler's equation by a free jet | I. Principle of momentum |
| b. Pressure exerted by gas molecules | II. Equation for conservation of momentum |
| c. Rotating lawn sprinkler | III. Momentum equation |
| d. Equation of motion along a stream line | IV. Bernouli's equation |
Choose the correct answer from the options given below.
Answer: B
The Board's key is a-II, b-I, c-III, d-IV.
d matches IV at once: integrating the equation of motion along a streamline for steady ideal flow gives Bernoulli's equation. Every option pairs a with II, since Euler's equation is the momentum equation for an ideal fluid, so the choice is between B and C.
The key takes b with I: the pressure of a gas on a wall is explained by the change of momentum of molecules striking it, the principle of momentum. The rotating lawn sprinkler (c) is the standard application of the momentum equation in its moment-of-momentum form, matching III. Options pairing d with III are wrong because Bernoulli's equation belongs to the streamline.
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