Question
The nuclei ${ }_{6} C^{13}$ and ${ }_{7} N^{14}$ can be described as
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An unknown transistor needs to be identified as a $npn$ or $pnp$ type. A multimeter, with $+ve$ and $-ve$ terminals, is used to measure resistance between different terminals of transistor. If terminal $2$ is the base of the transistor then which of the following is correct for a $pnp$ transistor?
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A police car with a siren of frequency $8$ $kHz$ is moving with uniform velocity $36$ $km/hr$ towards a tall building which reflects the sound waves. The speed of sound in air is $320$ $m/s$. The frequency of the siren heard by the car driver is .... $kHz$
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In the light of the above statements, choose the most appropriate answer from the options given below: