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A ray of light travels from water to air. If the angle of incidence is 40°, then the angle of refraction is
A rear-view mirror for driving is
A remote control gadget (for TV etc.) has in it
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