1 B.Sc. (Computer Science) Part-I Examination, 2010 Computer Programming Fundamental Time allowed : Three Hours Max. Marks : 50 Part-A (Compulsory) Answer all ten questions (20 words each). Part-B (Compulsory) Answer all five questions (50 words each). Part-C (Marks : 30) Answer all three questions (400 words each). PART A 1. What are declaring and defining stages of a variable? 2. What is effect of writing a continue statement in a loop? 3. How is a pretest loop different from post-test loop? 4. What is preprocessor directive? 5. What do you understand by a pointer? 6. How does a structure differ from an array? 7. Difference between structures and union. 8. How does an append mode differ from a write mode? 9. What is a null statement? 10. Distinguish between the getc and getch functions. -1-
2 PART B 1. What are the differences between signed and unsigned data type? 2. What are the escape sequences? 3. What are functions? Write the general syntax for declaring a function. 4. What is comment statement? How a comment statement is treated by a compiler. 5. What is a union? How is a union declared in C? PART C 1. Differentiate conditional and unconditional branching. Explain unconditional branching with suitable example. What is an operator? Explain different types of operators with example of each type. 2. What is an array? Explain pointer and arrays with suitable example. What is recursion? Write a C program to calculate the factorial of a given number using recursion. 3. What is a structure? Define a structure personal that would contain person_name, date of joining and salary. Using this structure write a program to read this information for one person and print the same on the screen. a) Explain the difference between call by value and call by reference. Explain with example. b) What are basic file operations? Explain with syntax. -2-
3 B.Sc. (Computer Science) Part-I Examination, 2010 DIGITAL COMPUTER GANIZATION Time allowed : Three Hours Max. Marks : 50 Part-A (Compulsory) Answer all ten questions (20 words each). Part-B (Compulsory) Answer all five questions (50 words each). Part-C (Marks : 30) Answer all three questions (400 words each). PART A 1. What is Information? 2. What is expanded form of the word EBCDC? 3. What do you understand by Error? 4. What is the role of Register Unit? 5. Define Interruption 6. What Multiplexer do? 7. Write the full form of CD-ROM. 8. What is the function of Hamming Code? 9. Differentiate between AND and gates. 10. What are utility lines? -3-
4 PART B 1. Convert the following numbers: a) 110111011.111 2 to decimal b) 116.65 8 to Hexadecimal 2. Generate truth tables for the following: a) AND gate b) X gate c) NAND gate d) gate 3. List different Input and Output device. 4. Differentiate between RAM and ROM. 5. Explain interrupts controlled information transfer. PART C 1. Write short notes on: a) Master Slave Flip Flop b) Error Correction c) Logic Gates d) Encoders and Decoders e) System Bus Explain different secondary storage devices in detail. 2. What are registers? Differentiate types of registers. Also explain role of different registers. Detail out the logic circuit of a computer system. 3. Explain the special purpose registers in detail. Explain I/O Architecture in detail. -4-
5 B.Sc. (Computer Science) Part-I Examination, 2010 ELECTRONICS - I Time allowed : Three Hours Max. Marks : 50 Part-A (Compulsory) Answer all ten questions (20 words each). Part-B (Compulsory) Answer all five questions (50 words each). Part-C (Marks : 30) Answer all three questions (400 words each). PART A 1) Define electricity. 2) Define Ohm s law. 3) How can you calculate mutual electric force between two charges? 4) What is electrostatic shielding? 5) What is impedance matching? 6) What is current divider rule? 7) What is nominal cell potential of NiCd cells? 8) What will be the result of the following reaction? 2NiO(OH) + Cd + 2H 2 O -> 2Ni(OH) 2 + Cd (OH) 2 9) What is power factor? 10) With the help of a diagram show how a resistor connects to the source of AC volatage. -5-
6 PART B 1) Explain why do conductors have zero electrostatic field. 2) A 600 pf capacitor is charged by a 200 V supply. It is then disconnected from the supply and is connected to another uncharged 600 pf capacitor. How much electrostatic energy is lost in the process? 3) What are the advantages of NiCd cells over other batteries? 4) Why does audio frequency coils have ferromagnetic iron cores? 5) Explain the design of basic light weight diaphragm loudspeaker. PART C 1. i) How can we generate electricity by spinning a coil within a magnetic field? Explain. ii) Explain the working of Wheatstone Bridge. 2. i) Explain basic properties of electric charge. ii) How can we calculate The venin equivalent? Explain? 3. i) How can we implement phase relationship between voltage & current in AC circit? ii) A small town with a demand of 800 kw of electric power at 220 V is situated 15 Km away from an electric plant generating power at 440 V. The resistance of the two wire carrying power is 0.5 Ω per Km. The town gets the power from the line through a 4000 220 V step down transformer at a substation in the town. a) Estimate the line power loss in the form of heat. b) How much power must the plant supply, assuming there is negligible power loss due to leakage? c) Characterize the step-up transformer at the plant. d) How much the power must the plant supply, if the transformer is replaced by a 44,000 200 V step down transformer? -6-
7 B.Sc. (Computer Science) Part-I Examination, 2010 ELECTRONICS-II Time allowed : Three Hours Max. Marks : 50 Part-A (Compulsory) Answer all ten questions (20 words each). Part-B (Compulsory) Answer all five questions (50 words each). Part-C (Marks : 30) Answer all three questions (400 words each). PART A 1. a) Define semiconductor. b) What is meant by avalanche breakdown? c) Explain energy bands in solids. d) What is photovoltaic effect? e) What is solar cell? f) Explain how a transistor can be used as an amplifier. g) Why is collector wider than emitter? h) What is a RC coupled amplifier? i) The voltage gain of an amplifier is 40. Find its decibel gain. j) Define SCR. -7-
8 PART B 2. Derive an expression for the current density and conductivity of a n-type semiconductor. (2) 3. What is Zener diode? Explain its working. (2) 4. Compare CE, CB and CC configuration of BJT. (2) 5. What is RC-coupled amplifier? Explain frequency response. (2) 6. Explain bidirectional thyristor. (2) PART C 7. Derive an expression for number of holes in valence band and Fermi level in an intrinsic semiconductor. (10) 8. Discuss biasing problems in Darlington pair. How is it solved? Explain boot strapping principle and how effectively it is used in Darlington pair. (10) 9. Write short notes on (any two) a) UJT b) Triggering method on SCR c) TRIAC -8-
9 B.Sc. (Computer Science) Part-I Examination, 2010 COMPUTER MAINTENANCE-I Time allowed : Three Hours Max. Marks : 50 Part-A (Compulsory) Answer all ten questions (20 words each). Part-B (Compulsory) Answer all five questions (50 words each). Part-C (Marks : 30) Answer all three questions (400 words each). PART A 1) a) Define the term Electronic theory. b) What are filters? c) What is modulation and demodulation? d) What is the meaning of amplification? e) What are active and passive elements? f) What is a catalyst? g) What is a diode and a triode? h) What is virtual function? i) Define the meaning of analog signals. j) What is a PCB? -9-
10 PART B 2) What are low pass and high pass filters? Explain their functioning. 3) What is Kirchoff s current law? 4) Write the Thevenin s theorem. 5) What is the meaning of voltage and current gain in relation to an amplifier? 6) What are digital and analog signals and how they travel on a cable? (5*2=10) PART C 7) a) What is Norton s theorem? Write the circuit concept of time constant. 5 b) What is photodiode? Write a note on zener diode. 5 8) a) What are clamping and clipping circuits? Write a short note on CPU. b) What is the basic configuration of a computer system? Give example. 9) Write short notes on following: a) Comparator b) Op-Amp Parameters c) Decibel input output -10-
11 B.Sc. (Computer Science) Part-I Examination, 2010 COMPUTER MAINTENANCE-II Time allowed : Three Hours Max. Marks : 50 Part-A (Compulsory) Answer all ten questions (20 words each). Part-B (Compulsory) Answer all five questions (50 words each). Part-C (Marks : 30) Answer all three questions (400 words each). PART A 11) Define Batch processing System. 12) Explain the use of EEPROM. 13) Differentiate between Copy and Xcopy. 14) List various vi features. 15) Explain Online System. 16) Explain the use of Secondary Storage. 17) Differentiate between Internal and External Commands. 18) What is connectionless services. 19) What is MIDI. 20) What is TCP/IP? PART B -11-
12 1. Discuss the application of computers in real time world. 2. Discuss the need of Operating System. 3. Explain the UNIX architecture. 4. Discuss the characteristics of Real Time System. 5. Explain TCP/IP Model. PART C 1. Explain the various models of Data Processing prevailing in the market, justify their suitability in various fields 2. Unix operating system is more secured than DOS, justify the statement. Also explain various UNIX and DOS command. 3. Explain the need of OSI layers, also discuss each layer in detail. -12-