Electronics Model Question Paper : www.scert.kerala.gov.in State Council Educational Research and Training

[mariammal]

Model Question Paper - I
ELECTRONICS
Class - XII

1a Can you give one example each for low frequency (LF), Medium frequency (MF), High frequency and very high frequency (VHF) (1)
b You have the three modes of propagation for radio broad casting. Which among them can be used for television broad casting? (1)
c Why can’t we use the other two for TV broad casting? (2)
3. Go through the AM envelop given below. Analyse it and obtain the following.
i. depth of modulation (2)
ii. plot of the carrier and modulating signal wave forms. (4)

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4 You know that slow scanning rate affects TV signal transmission and reception. What are the
bad effects? Suggest methods to overcome these effects. (3)
5 Give your opinion on the particular structure used for yagi-uda antenna. (4)
OR
Draw a neat block diagram of monochromatic television receiver and write the functions of
blocks in one sentence each.
6. a. Suppose you are a cable TV operator. Which among the following medium will you select
to provide more than 50 channels to your customers. (1)
i) twin lead wire
ii) coaxial cable
b. Justify your answer
7. Arrange the following in the correct order (2)
PSTN single processor Electrodes
Centralised SPC scalp very high band width
Distributed SPC inter toll trunks very powerful processor
EEG uses low cost processors Functions are performed by many
computers.
8a. Suppose your teacher organised a field visit for you to observe various applications of
computers in different fields. Classify the applications you observed. (2)
b. The computer you use at home and that situated at the nearby railway station are not similar.
Give your comments.
9. Select a 32 bit microprocessor
i) Intel 80186
ii) Intel 80286
iii) Intel pentium IV
iv) Motorola’s MC 68000 (1)
10 If the elements of the set A = {science, electronics, electrons}, can be related to form meaningful
sentence as 'Electronics is a branch of science which deals with the controlled flow of electrons",
then similarly form such sets from the following table by arbitrarily selecting one word from
each column and frame meaningful sentences.
Microprocessor Microphone Modem
WAN RAM Electromagnetic induction
Transducer Intel 80186 Semiconductor
Main memory Internet VLSI technology (4)
11. a. You have the following components of a computer. Categorise them into input, output and
memory devices.
Monitor, Printer, Keyboard, CD- ROM, joystick, Mouse, Hard disk, RAM (2)
b. Suppose as instructed by your teacher, all the students prepared their seminar reports using
computer print out. Your copy was of poor quality and your friend got a better quality print out from some other printer. But he was to spend more money. Compare the two printing technologies. (2)
12. a. While working with your personal computer if the power supply failed unexpectedly will it affect the currently entered data? Justify your answer. (1)
b. Give examples for read only memory that can be programmed. (1)
13 a. It is possible that using any of the computerised railway reservation counters, you can reserve you tickets from any station to any other station. Discuss the process in relation to networking.
(2)
b. Suppose you want to send e-mail to your friend in USA. You have your own PC. Then what else you need? Explain the process of data transmission behind this using an illustrative
diagram. (4)

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