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7). In a transistor amplifier, IC = 5.5 mA , IE = 5.6 mA. The current amplification factor β is…

(a) 45  (b) 50  (c) 55  (d) 60 Ans : (c) 55
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6). For a transistor β =75 and IE = 7.5 mA. The value of α is….

(a) 0.1  (b) 0.66  (c) 0.75  (d) 0.98 Ans: (d) 0.98
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5). In a common base configuration, the transistor has emitter current of 10 mA and collector current of 9.8 mA. The value of base current is….

 (a) 0.1 mA  (b) 0.2 mA  (c) 0.3 mA  (d) 0.4 mA Ans: (b) 0.2 mA
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4). The Boolean expression for Exculsive OR gate (X-OR gate) is

 (a) A+B  (b) A⊕𝐵  (c) 𝐴 + 𝐵  (d) A.B Ans: (b) A⊕𝐵
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3). Solar cell operates on a principle of

(a) diffusion  (b) recombination  (c) photovoltaic action  (d) carrier flow Ans: (c) photovoltaic action
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2). A LED emits visible white light when its

(a) junction is reversed biased  (b) depletion layer widens (c) holes and electrons recombine  (d) junction becomes hot Ans: (c) holes and electrons recombine.
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