MCQ
A tachometer is a device to measure
- ASpeed of rotation
- ✓Gravitational pull
- CSurface tension
- DTension in a spring
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(Take speed of sound in air as $340\, {ms}^{-1}$ )



| LIST $-I$ | LIST $-II$ |
| $(A)$ Torque | $(I)$ $kg\,m ^{-1}\,s ^{-2}$ |
| $(B)$ Energy density | $(II)$ $kg\,m\,s^{-1}$ |
| $(C)$ Pressure gradient | $(III)$ $kg\,m ^{-2}\,s ^{-2}$ |
| $(D)$ Impulse | $(IV)$ $kg\,m ^2\,s ^{-2}$ |
Choose the correct answer from the options given below