Shock Wave MCQs (Multiple Choice Questions) PDF Download - 142

Conical pressure wave front produced by a body moving at a speed greater than that of sound is called

1. Elliptical cone
2. Mach cone
3. Noch cone
4. Unit cone

If a wave traveling along a string is y(x,t)=0.0032sin(72.1x-2.72t), in which numerical constants are in SI units i.e. 0.0032m, 72.1rad/m and 2.72rad/s, then velocity of wave is

1. 2 m/s
2. 0.32 m/s
3. 0.037 m/s
4. 0.023 m/s

Conservation law holds in rotational motion if

1. torque is constant
2. displacement is constant
3. angular momentum is constant
4. transnational power is constant

Average speed of an object is equals to

1. total distance covered by object/2
2. total distance covered by object/60m
3. total distance covered by object/rate of change of time
4. 2 x total distance covered by object/rate of change of time

Terminal speed of a typical parachutist is almost

1. 1 m/s
2. 2 m/s
3. 60 m/s
4. 5 m/s