Physics
(i) Name the colour code of the wire which is connected to the metallic body of an appliance.
(ii) Draw the diagram of a dual control switch when the appliance is switched 'ON'.
Related Questions
(i) What are damped vibrations?
(ii) Give one example of damped vibrations.
(iii) Name the phenomenon that causes a loud sound when the stem of a vibrating tuning fork is kept pressed on the surface of a table.
(i) A wire of length 80 cm has a frequency of 256 Hz. Calculate the length of a similar wire under similar tension, which will have frequency 1024 Hz.
(ii) A certain sound has a frequency of 256 hertz and a wavelength of 1.3 m.
Calculate the speed with which this sound travels.
What difference would be felt by a listener between the above sound and another sound travelling at the same speed, but of wavelength 2.6 m?
(i) Which particles are responsible for current in conductors?
(ii) To which wire of a cable in a power circuit should the metal case of a geyser be connected?
(iii) To which wire should the fuse be connected?
(i) Explain the meaning of the statement 'current rating of a fuse is 5A'.
(ii) In the transmission of power, the voltage of power generated at the generating stations is stepped up from 11 kV to 132 kV before it is transmitted. Why?