SCERT Kerala Class XII Electronics Sample Question Paper 2015

Organisation : State Council of Educational Research & Training
Exam : Higher Secondary Education Exam
Subject : Electronics
Document Type : Sample Question Paper
Year : 2015
Class : XII STD

Website : http://www.scert.kerala.gov.in
Download Sample Question Paper : https://www.pdfquestion.in/uploads/8492electronicsXII.pdf

Electronics Class XII Sample Question Paper :

Maximum : 60 Scores
Time: 2hrs
Cool off time : 15 Minutes

Related : SCERT Kerala Computer Applications – Humanities Class XII Sample Question Paper 2015 : www.pdfquestion.in/8489.html

Guidelines for setting Question Paper – ELECTRONICS :
1. Multi level questions should be promoted.
2. The weight of objective questions should be between 15%-20% of Total score and it should carry one score
3. The weight of essay question should be between 15%-20% of Total score and it should carry four or five scores

4. The short answer question should carry two or three scores.
5. The content/problems given as box item in the SCERT text book should not be used for term end evaluation.
6. Derivation should be included for 20%- 25% of Total score.

7. Numerical problems should be included for 15%- 20% of Total score.
8. Graph, diagrams and pictures should be included in the questions wherever necessary.
9. Specific hints should be included in the questions if needed.

General Instructions to candidates :
** There is a ‘Cool off time’ of 15 minutes in addition to the writing time of 2 h.
** You are neither allowed to write your answers nor to discuss anything with others during the ‘cool off time’.
** Use the ‘cool off time’ to get familiar with questions and to plan your answers.

** Read the questions carefully before answering
** All questions are compulsory and only internal choice is allowed.
** When you select a question, all the sub-questions must be answered from the same question itself.
** Calculations, figures and graphs should be shown in the answer sheet itself.

** Malayalam version of the questions is also provided.
** Give equations wherever necessary
** Electronics devices except nonprogrammable calculators are not allowed in the Examination Hall.

Answer the Questions :
1. A regulated power supply is quite essential in electronic circuits.
(a) …….diode is commonly used in a voltage regulator (zener diode, ordinary diode, photodiode, PIN diode)
(b) Draw the block diagram of a regulated power supply unit

2. A digital comparator circuit is used to compare two data in microprocessors. This circuit is designed using logical gates.
a) If A and B are two bits, …….logical gate is used to compare if they are equal or not.
(b) Write the truth table for the above gate.
(c) Draw a 1-bit comparator circuit

2. (a) …….is a digital circuit used to route information from several lines into a single line.
(b) Draw the truth table for a combinational logic circuit to transmit 4 data inputs into a single output
(c) Realize the above circuit using basic logic gates

3. Now a days, optical fiber communication is widely used for long distance communication such as telephones.
(a) In optical fiber communication system, electrical signals are converted into light using……… (Photodiode, laser diode, phototransistor, APD)
(b) Explain the advantages of using optical fiber cables instead of copper cables in communication
(c) A PIN photodiode is a better light detector than a pn photodiode. Why?

4. (a) In Indian TV system (625 line TV system) ………scanning is used (Progressive scanning, interlaced scanning, document scanning, none)
(b) …….modulation is used for picture signals in TV transmission. (DSB, SSB, SSB-SC, VSB)
(c) A complete TV channel, occupies a bandwidth of ….for transmission
(d) To avoid flickering, frame rate has to be increased. But this increases the bandwidth requirements in TV transmission. Suggest a method to avoid flicker without increasing bandwidth.

5. (a) …..is a device used to get a hardcopy output from a computer (keyboard, printer, mouse, RAM) (1)
(b) A laser printer provides a better quality output when compared to a dot matrix printer. With the help of diagram, explain the working of laser printer. (3)
(c) ……memory is the fastest memory in computer (cache, primary memory, secondary memory, none) (1)

6. (a) Networking between computers provides us with several advantages. Mention any four advantages. (2)
(b) ……is a hardware component that allows a computer to get connected to the network. (1)
(c) Web pages are designed using….. (C, C++, HTML, FORTRAN) (1)
(d) Modems are essential for communication between two computers in internet. Explain. (2)
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