| (Papers) CISCE : Download Class XII Exam Papers-2018 (ELECTRICITY AND ELECTRONICS) Posted: 02 Feb 2019 04:04 AM PST 
(Papers) CISCE : Download Class XII Exam Papers-2018 (ELECTRICITY AND ELECTRONICS)
ELECTRICITY AND ELECTRONICS : - Subject : ELECTRICITY AND ELECTRONICS
- Year : 2018
- Class : 12
- Duration : 3 Hour
Instruction : - Answer all questions from Part I (Compulsory) and five questions from Part II.
- All working, including rough work, should be done on the same sheet as,and adjacent to the rest of the answer.
- Mathematical tables and squared paper are provided.
- The intended marks for questions or parts of questions are given in brackets [ ].
Question 1
With the help of a neat circuit diagram, explain the working of a full wave rectifier. [4]
Question 2
(a) Name the component used for each of the following: [2]
(i) Filtration of electrical signal.
(ii) Amplification of electrical signal.
(b) Name an element for each of the following: [2]
(i) Pentavalent atom
(ii) Trivalent atom
Question 3
Explain briefly how a zener diode works where there is increase in: [4]
(a) Load
(b) I/P voltage
Question 4
(a) Write any two properties of insulation used in a cable. [2]
(b) State any two reasons why conductors are usually made up of copper, aluminium,or galvanised steel.[2]
Question 5
Sketch a graph to show the plate characteristics of a triode. Also, state any two inferences drawn from the graph.[4]
Question 6
Fill in the blanks choosing the appropriate word from those given in brackets.
Write the correct answer in your answer booklet.[4]
(a) A metal plate buried deep inside earth in any electrical installation is called_____.
(earthing, doping)
(b) A safety device used for preventing an appliance from damage is called _______.
(fuse, inductor)
(c) If a pure semiconductor is heated, its resistance will go _______. (up, down)
(d) A device used in regulated power supply to change the voltage is called________.
(transformer, capacitor)  |
| (Papers) CISCE : Download Class XII Exam Papers-2018 (COMPUTER SCIENCE) Posted: 02 Feb 2019 03:55 AM PST
(Papers) CISCE : Download Class XII Exam Papers-2018 (COMPUTER SCIENCE)
COMPUTER SCIENCE : - Subject : COMPUTER SCIENCE
- Year : 2018
- Class : 12
- Duration : 3 Hour
Instruction : - Answer all questions in Part I (compulsory) and six questions from Part-II, choosing two questions from Section-A, two from Section-B and two from Section-C .
- All working, including rough work, should be done on the same sheet as therest of the answer.
- The intended marks for questions or parts of questions are given in brackets [ ].
Question 1
(a) State the law represented by the following proposition and prove it with the help of a truth table: [1]
P V P = P
(b) State the Principle of Duality. [1]
(c) Find the complement of the following Boolean expression using De Morgan’s law: [1]
F(a,b,c) = (bʹ + c) + a
(d) Draw the logic diagram and truth table for a 2 input XNOR gate. [1]
(e) If (~P => Q) then write its: [1]
(i) Inverse
(ii) Converse  |
| (Papers) CISCE : Download Class XII Exam Papers-2018 (BIOTECHNOLOGY) Posted: 02 Feb 2019 03:40 AM PST
(Papers) CISCE : Download Class XII Exam Papers-2018 (BIOTECHNOLOGY)
BIOTECHNOLOGY : - Subject : BIOTECHNOLOGY
- Year : 2018
- Class : 12
- Duration : 3 Hour
Instruction : - Answer Question 1 (compulsory) from Part I and five questions from Part II.
- The intended marks for questions or parts of questions are given in brackets [ ].
Question 1
(a) Mention any one significant difference between each of the following: [5]
(i) Reducing sugar and non-reducing sugar.
(ii) Triploids and haploids.
(iii) Lac operon and Trp operon
(iv) Blunt end and sticky end.
(v) Spectroscopy and colorimetry. (b) Answer the following questions: [5]
(i) Who developed the microbe called super bug, which was designed to degrade spilled oil?
(ii) Name any two growth regulators used in a culture medium.
(iii) What is an apoenzyme?
(iv) How is the disease albinism caused?
(v) State any one limitation of gynogenesis. (c) Write the full form of each of the following: [5]
(i) AFLP
(ii) SSBs
(iii) BAC
(iv) CIMAP
(v) PAGE  |
| (Papers) CISCE : Download Class XII Exam Papers-2018 (Art) Posted: 02 Feb 2019 03:10 AM PST
(Papers) CISCE : Download Class XII Exam Papers-2018 (Art)
Art : - Subject : Art
- Year : 2018
- Class : 12
- Duration : 3 Hour
Instruction : - Answer Question 1 from Part I and five questions from Part II.
- The intended marks for questions or parts of questions are given in brackets [ ]. This paper is for the use of the Supervisor only, in consultation with the Art Teacher.
- Attention is directed to the syllabus and to the Standing Instructions
- as given in the syllabus book.
- The Supervisor is asked to ensure that the candidate’s unique identification number (UID)
- and index number in that order, are written clearly in the top right-hand corner of the
- front surface of the paper.
- It may prove impossible to give marks for the work unless the unique identification number (UID) and index number are legible
A. Objects Required:
A violin case. A violin and its bow. A few pages of sheet music. A small table or a stand to hold the pages. Arrangement:
Open the violin case and stand the violin vertically in it. Rest the bow on the case at a slant. Place the stand or table to one side of the violin with the pages of sheet music either inserted in the stand or placed on the table.
OR
B. Objects Required:
A large basket. A small pumpkin, two packets of mushrooms, two or three red and ellow bell peppers, a few carrots with leaves and some lemons. rrangement:
Arrange the vegetables in the basket to make an attractive composition  |
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