## Electronics Quiz-9

As per analysis for previous years, it has been observed that students preparing for NEET find Physics out of all the sections to be complex to handle and the majority of them are not able to comprehend the reason behind it. This problem arises especially because these aspirants appearing for the examination are more inclined to have a keen interest in Biology due to their medical background.

Furthermore, sections such as Physics are dominantly based on theories, laws, numerical in comparison to a section of Biology which is more of fact-based, life sciences, and includes substantial explanations. By using the table given below, you easily and directly access to the topics and respective links of MCQs. Moreover, to make learning smooth and efficient, all the questions come with their supportive solutions to make utilization of time even more productive. Students will be covered for all their studies as the topics are available from basics to even the most advanced.

Q1. Given below are symbols for some logic gates The XOR gate and NOR gate respectively are

•  1 and 2
•  2 and 3
•  3 and 4
•  1 and 4
Solution:-
(B)

Q2.A diode having potential difference 0.5 V across its junction which does not depend on current, is connected in series with resistance of 20Î© across source. If 0.1 A current passes through resistance then what is the voltage of the source?
•  1.5V
•  2V
•  2.5V
•  5V
Solution
(c) The circuit diagram of the given situation is shown. Since, it is a closed mesh, the voltage is V=V'+IR Given, V'=0.5 V,I=0.1 A,R=20Î© I=0.5+0.1×20 V=2.5volt

Q3.  In a common emitter amplifier the input signal is applied across
•  Anywhere
•  Emitter collector
•  Collector-base
•  Base Emitter
Solution
(d) In CE amplifier, the input signal is applied across base-emitter junction as shown in the figure below.

Q4. In the adjacent circuit, A and B represent two inputs and C represents the output. The circuit represents

•  NOR gate
•  AND Gate
•  NAND Gate
•  OR Gate
Solution
(d) If we give the following inputs to A and B, then corresponding output is shown in table

The above table is similar to OR gate.

Q5.The slope of plate characteristic of a vacuum tube diode for certain operating point on the curve is 10-3 mA/V. The plate resistance of the diode and its nature respectively
•  100 kilo-ohms static
•  1000 kilo-ohms static
•  1000 kilo-ohms dynamic
•  100 kilo-ohms dynamic
Solution

Q6. In NPN transistor, 1010 electrons enter in emitter region in 10-6 s. If 2% electrons are lost in base region then collector current and current amplification factor (Î²) respectively are
•  1.57 mA,49
•  1.92 mA,70
• 2 mA,25
•  2.25 mA,100
Solution
(a) Ie=1010×1.6×10-19×1/10-6=1.6 mA[∵I=Q/t] Since 2% electrons are absorbed by base, hence 98% electrons reach the collector, i.e.,Î±=0.98 ⇒Ic=Ï‰Ie=0.98×1.6=1.568 mA≈1.57 mA Also current amplification factor Î²=Î±/(1-Î±)=0.98/0.02=49

Q7.The crystal structure can be studied by using
•  UV rays
•  X-rays
•  IR-rays
•  Microwaves
Solution
(B)

Q8.In a transistor the base is
•  Insulator
•  A conductor of low resistance
•  A conductor of high resistance
•  An extrinsic semiconductor
Solution
(b) In a transistor the base is a conductor of low resistance.

Q9.A strip of copper and another of germanium are cooled from room temperature to 80 K. the resistance of
•  Each of these decreases
•  Copper strip increases and that of germanium decreases
•  Copper strip decreases and that of germanium increases
•  Each of the above increases
Solution
(c) Germanium is semiconductor, whereas copper is conductor. For conductors, R∝∆t For semiconductors, R∝1/∆t Hence, when both are cooled, then resistance of copper decreases whereas that of germanium increases.

Q10. Number of secondary electrons emitted per number of primary electrons depends on
•  Material of target
•  Frequency of primary electrons
•  Intensity
• None of these
Solution
(c) Intensity ∝ Number of electrons

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