Physics
A wavelength of 0.3 m is produced in air and it travels at a speed of 300 m/s. Then it will be an

Infrasonic wave
Ultrasonic wave
Microwave
Audible wave

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Physics
A balloon filled with hydrogen will

Continue going upwards uninterrupted
Reach a particular height and remain floating
Burst after reaching some height
Reach a particular height and start coming down

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Physics
In the process of magnetisation of a bar

The entire bulk of the bar gets magnetised
Only the ends of the bar get magnetised
Only the surface of the bar gets magnetised
Only some parts of the outer layers of the bar get magnetised

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