## ELECTRONICS-QUIZ 13

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. Which of the following has negative temperature coefficient of resistance
•  Copper
•  Aluminium
•  Iron
•  Germanium
Solution
(d) Temperature co-efficient of semiconductor is negative

Q2.The logic circuit shown below has the input waveforms A and B as shown. Pick out the correct output waveform.

•

•

•

•

Solution
(a)

Q3. In an n-type semiconductor, the fermi energy level lies
•  In the forbidden energy gap nearer to the conduction band
•  In the forbidden energy gap nearer to the valence band
•  In the middle of forbidden energy gap
•  Outside the forbidden energy gap
Solution
(a) In an n-type semiconductor, the fermi energy level lies near the conduction band in the forbidden energy gap.

Q4. The combination of gates shown below yields

•  OR gate
•  NOT gate
•  XOR gate
•  NAND gate
Solution
(a) Truth table for given combination is

This comes out to be truth table of OR gate.

Q5.In Colpitt oscillator the feedback network consists of
•  Two inductors and a capacitor
•  Two capacitors and an inductor
•  Three pairs of RC circuit
•  Three pairs of RL circuit
Solution
(b) In the Colpitt oscillator, the tank circuit has a single inductor, tapped in the middle with two capacitors instead of two inductors and a single capacitor as in the case of the Hartley oscillator

Q6. Which of the following is an amorphous substance?
•  Gold
•  Silver
• copper
•  Glass
Solution
(d) Amorphous solid is a solid in which there is no long range order of the positions of the atoms. Glass is a uniform amorphous solid material, usually produced when the viscous molten material cools very rapidly to below its glass transition temperature, without sufficient time for a regular crystal lattice to form.

Q7.The phenomenon of thermionic emission was discovered by
•  Marcoini
•  Fleming
•  Forest
•  Thomas Edison
Solution
(d) Thermonic emission was discovered by Thomson Edison.

Q8.For a given triode Î¼=20. The load resistance is 1.5 times the anode resistance. The maximum gain will be
•  16
•  12
•  10
•  None of the above
Solution
(b)12

Q9.A metallic surface with work function of 2 eV, on heating to a temperature of 800 K gives an emission current of 1 mA. If another metallic surface having the same surface area, same emission constant but work function 4 eV is heated to a temperature of 1600 K, then the emission current will be
•  1 mA
•  2 mA
•  4 mA
•  None of these
Solution
(c)4 mA

Q10. In a NPN transistor, 108 electrons enter the emitter in 10-8 s. If 1% electrons are lost in the base, the fraction of current that enters the collector and current amplification factor are respectively
•  0.8 and 49
•  0.9 and 90
•  0.7 and 50
•  0.99 and 99
Solution
(d) 0.99 and 99

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