Electronics

Q: Total spherical surface area is given by the formual :

(a) :  4/3 ∏r2
(b) :  4∏r3
(c) :  4 ∏r2
(d) :  4/3 ∏r
(e) :  None of these
Answer:  4 ∏r2
Explanation:  

Q: In case of an op-amp, when V₋ > V₊ , then output voltage becomes equal to

(a) :  Voltage to be compared
(b) :  Reference voltage
(c) :  ₋ Vcc
(d) :  ₊ Vcc
(e) :  Either B or C
Answer:  ₋ Vcc
Explanation:  

Q: In describing functions of digital systems, 0 represents

(a) :  Off bulb
(b) :  True statement
(c) :  Closed switch
(d) :  On bulb
(e) :  Answer yes to a question
Answer:  Off bulb
Explanation:  

Q: An example of photoconductor is :

(a) :  Boron
(b) :   Carbon
(c) :  Iron
(d) :   Aluminium
(e) :   Selenium
Answer:   Selenium
Explanation:  

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