Q-1. Name 4 pillars of OOPS.
Ans: Inheritance, Abstraction, Encapsulation and Polymorphism
Q-2. On what platform does Java runs.
Ans: Java is platform independent.
Q-3. While pushing data in stack whether stack pointer increases or decreases?
Ans: Stack pointer increases while pushing data in a stack in C. (This can be a bit confusing as the stack pointer decreases in Microprocessor)
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Q-4.Difference between FTP and TFTP.
Ans: FTP is File Transfer Protocol used to send or receive file from remote computer. TFTP stands for Trivial File Transfer Protocol and is simpler than FTP. FTP uses TCP [Transmission Control Protocol] as transport layer protocol while TFTP uses UDP [User Datagram Protocol]. FTP uses more memory and programming effort than TFTP. FTP sends data over a separate TCP connection while TFTP uses no connection since UDP is connection-less protocol.
Q-5. Name OSI [Open Systems Interconnection] layers?
Ans: There are seven OSI layers which are divided in host layer, transport layer and media layer.
These are:
Q. FTP[File Transfer Protocol] works on which OSI layer?
Ans: Application Layer.
Q.What protocol we use in transport layer?
Ans: TCP [Transmission Control Protocol], UDP [User Datagram Protocol].
Q. Explain architecture of GSM.
Ans:
Q. When microcontrollerr-8051 powers up, by default which register has the value zero stored?
Ans: PC (Program Counter)
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Q. Who invented Bluetooth? And tell me about its features.
Ans: Bluetooth is a wireless technology Invented by telecom Ericsson in 1994. It is used for exchanging data over short distances. It operates on frequency band at 2.4 to 2.485 GHz. Its range is 100m. It is compatible in mobile phones, personal computers, headset, speakers, etc. The technology operates using a spread spectrum, frequency hopping, full-duplex signal at a nominal rate of 1600 hops/sec.
Q. Why transistor has thin and lightly doped base?
Ans: Base is interconnection between emitter and collector. It is thin and lightly doped to minimize majority carriers thus enhancing diffusion current by minimizing electron-hole recombination and transferring almost whole current from emitter to collector.
Q. In the given circuit diagram what is the current that flows through the zener diode? (Fig explained: A battery connected with 500 Ω resistor and with a zener diode. Zener diode is connected in parallel with 1000 Ω resistor.) (Zener diode voltage: 5V.)
Ans: 20 milliampere. Since the zener diode will act as a short circuit. Therefore the current will complete its path through R0(500 ohm) resistor to the diode.
Idiode=(10V/500 Ω) ampere.
Continued to Part 2