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Class 9Class 10First YearSecond Year
$vii. The output of a NAND gate is 0 when(a) both of its inputs are 0 b) both of its inputs are 1 \begin{array}{ll}\text { (c) any of its inputs is } 0^{\prime} & \text { (d) any of its inputs is } 1 \text { }\end{array}$

$16.10. What are the three universal Logic Gates? Give their symbols and truth tables.$

$16.8. State and explain for each case whether the information given by the following devices is in analogue or a digital form.b. a microphone generating an electric current.$

$16.4. Considering an oscilloscope explain:(v) Why the tube is evacuated?$

$v. The output of a two-input NOR gate is 1 when:(a) A is 1 and B is 0 (b) A is ^{\prime} 0^{\prime} and B is ^{\prime} 1^{\prime} (c) both A and B are O (d) both A and B are 1$

$16.5. What is electron gun? Describe the process of thermionic emission.$

$i. The process by which electrons are emitted by a hot metal surface is known as(a) boiling(b) evaporation(c) conduction(d) thermionic emission$