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a small oscillator that emits electric pulses
a small transmitter that emits infrared signals
a small electromagnet, that emits electromagnetic waves
none of these
A resonant system has a fundamental frequency of 100 Hz. If the next higher frequency that gives a resonance are 300 Hz and 500 Hz, the system could be
A rocket works on the principle of conservation of
A shell, initially at rest suddenly explodes into two equal fragments A and B. Which one of the following is observed?
A simple microscope consists of
A simple pendulum consists of a small metallic ball. This ball is called_.
A single fixed pulley is used to draw water from a well as
A single fixed pulley is used to draw water from a well because
A single phase full converter can operate in
A small drop of oil spreads over water because
A small gap is left at the joints of rails in a railway track to