REFRESHERELECTRONICS 5

MITRC

1. In what computer design in which the silicon transistor is replaced with a single molecule and a single electron

a. cellular computerb. dot computerc. nerve testd. molecular and dot computer 2. What computer design in which that idea is in direct laser or radio beam on a carefully

arrange connection of atomic nuclei, each of which is spinning line a topa. dot computerb. quantum computerc. ADA lovelace computerd. TX12 computer 3. What is the time interval to undertake a refresh operation in a typical dynamic RAM?

a. 2 usb. 100 usc. 2 msd. 100 ms 4. How many outputs does a six stage PISO (Parallel Input Serial Out) Shift Register havea. 2b. 1c. 3d. 5

5. What input disable multiplexer and demultiplexer when it is higha. glitchb. strobec. traced. scrot 6. Loading the operating system into a personal computer is called.a. bootingb. interruptingc. promptingd. paging 7. In an array of light sources, which light wave has the most energy?a. ultravioletb. infraredc. visibled. sound 8. A current of 10 milliamperes through the human bodya. cause mild sensationb. affect muscle controlc. affect breathingd. will cause death

9. A sum term that contains all the variables of a function in either complemented or uncomplemented form.

a. Maxtermb. Mintermc. Product termd. Midterm 10. In computer communications, it is a processing in which data are processed virtually as soon as

they are received.a. on line processingb. demand processingc. real time processingd. batch processing 11. An XOR produces an output only when the inputs are______.a. sameb. differentc. high d. low 12. What is the basic DTL configuration?a. OR gateb. NOR gatec. AND gated. NAND gate

13. The internet uses what method in assigning names and numbers to computers and users.

a. Domain name systemb. IP addressingc. ZIP code methodd. Hypertext Mark-up filing system 14. NA 8-bit digital data 10101100 is fed to an ADC. The refrence voltage is +10 volts. The

analog output voltage will bea. 6.7 Vb. 5.11 Vc. 0.039 Vd. 2.8 V 15. . A circuit has a supply voltage of 0.65Volts forward biasing a silicon diode and a LED

at the output. What most likely will occur?a. the LED wont lightb. the LED will blink and goes offc. the LED light steadilyd. the LED changes its color from red, orange and then busted 16. ECG was developed by Wilhem Einthoven purposely to record heart’s electrical

activity. What ECG type is capable of displaying the cross section of the valves and chambers of the heart?

a. M-modeb. 2D-echoc. 3D-echod. Cupid telescope

17. A breakthrough in medical field when Wilhelm Roentgen developed X-ray in 1895. X-ray is a diagnostic equipment using short wavelength of light that penetrate the body. Assuming your grandmother has scoliosis, what possible X-ray type that a radiologist will use?

a. myelogramb. arthrogramc. scoliogramd. lolagram 18.For a TTL gate, the recommended and standard fan out is _____.a. 5b. 10c. 15d. 20 19. Pacemaker is a battery operated device that helps the heart beat in a normal

rhythm. This function was based from the natural pacemaker of our biological body which is the ?

a. left ventricleb. aortac. sinoatrial noded. sino-ventricular node 20. MOS family used extensively where lowest power consumption is necessary isa. PMOSb. NMOSc. CMOSd. GMOS

21. Multiplexer is a circuit that accepts multiple inputs with only a single output. What is the other name for multiplexer?

a. multiplierb. Universal logic modulec. Universal logic package d. not a demultiplexer 22.________can be used as parallel to series converter.a. counterb. decoderc. demultiplexerd. multiplexer 23. A disk pack within a sealed data module.a. back-up unitb. Halosterc. Winchesterd. CD-ROM 24. In a system with MOS devices, the main bus loading factor is likely to be:a. resistiveb. currentc. capacitived. inductive

25. When a logic circuit rejects an unwanted signal, this is termed as______.a. logic levelsb. noise marginc. power consumptiond. propagation delay 26.The connecting leads of an IC chip is made of ___________.a. aluminumb. goldc. silverd. copper 27. A circuit that converts its input to its complement.a. inverterb. NOR gate with inputs tied togetherc. NAND gate with inputs tied togetherd. all of the above 28. How many NAND gates are needed to form an AND gate?a. 1b. 2c. 3d. 4

29. A fetch cycle is the a. last part of the instruction cycleb. first part of the instruction cyclec. intermediate part of the instruction cycled. auxiliary part of the instruction cycle 30. In MOS fabrication, the insulating layer of the gate electrodea. plasticb. silicon dioxidec. GaAsd. rubber with iron cement 31. Microprogram isa. the set of instructions indicating the primitive operation in a systemb. the name of the source program in microcomputersc. the name of programs in very small sized. the general name for MACROS in assembly language programming 32. MOS family that dominates the LSI fielda. CMOSb. PMOSc. GMOSd. NMOS

33. Breaking capacity of a circuit breaker is usually expressed in terms ofa. MVAb. Amperesc. voltsd. MW 34. These are the services used by the network to identify authorized users and

computersa. authentication servicesb. directory servicesc. log –on servicesd. proxy services 35. A service used to deny unauthorized access to websites, files, programs and

computers in a networked environment.a. firewallb. access rightsc. access listd. permissions 36.A flipflop whose output is the same as its input. This is sometimes used as a delay

element.a. RS flipflopb. D flipflopc. T flipflopd. JK flipflop

37. A decade counter requiresa. 10 flipflopsb. 4 flipflopsc. 5 flipflopsd. 3 flipflops 38. Sequential access digital memory uses what storage circuit?a. parallel registerb. shift registerc. dynamic RAMd. EEPROM 39. A variation of PROM wherein its stored data can be erased by electrical signals

instead of ultraviolet light.a. EEPROMb. dynamic RAMc. RAMd. EPROM 40. “ the illumination is directly proportional to the cosine of the angle made by the

normal to the illuminated surface with the direction of the incident flux” This statement is associated with

a. Plancks Trigo Lawb. Lamberts Cosine Lawc. Macbeth’s law of associated lightingd. Kagibuyo’s flux emission

41. A 12-bit microprocessor is capable of addressing 256K word memory, what is the length of the accumulator?

a) 256 bitsb) 8 bits c) 12 bits d) 18 bits 42. The input impedance of a MOSFETa. is very smallb.is standardc. highd. typically very very high 43. A computer problem due to the read-write hitting the disk a. debugb. head sirtc. head crashd. read-write bog 44. Some digital computers are called decimal computers becausea. each decimal digit is separately encoded in binaryb. decimal numbers can be read in such computersc. each memory element in such computers has 10 distinct stable statesd. the screen always display the number 10

45 Flag bits in arithmetic unit providea. status type informationb. repeatabilityc. facilities for rechecksd. symbol for the country 46. An instruction that can move data from memory to the accumulator.a. Fetchb. Movec, Stored. Load 47. An instruction that can move data from accumulator to memory.a. Fetchb. Movec, Stored. Load 48. A set of computers connected in a network whose processing is centralized in a server or a

central computera. workstationsb. dumb terminalsc. computersd. special computers

49. What is the one of the most ingenious ideas treating the double stranded molecule as a kind of biological computer tape

a. DNS computerb. molecule computerc. biological computerd. DNA computer 50. This is the term usually used when the monitor display is the actual size, design

and layout when saved and printed.a. GUIb. UIc. WYSIWYGd. RedHat 51. In any communication system, amplifiers compensate the attenuation of the

signals, what can we done in order to improve the efficiency of an amplifier?a. reducing the supply voltageb. decreasing unwanted power lossc. increasing supply currentd. reducing gload power 52. Dynamic impedance of a parallel circuit is calculated by this formula.a. L/CRb. L/Cc. RL/Cd. LC/R

53. In LIFOa. only the top of the stack is never accessibleb. only the top of the stack is immediately accessiblec. only the first is accessibled. the last is not accessible 54. Why is it that ordinary diode don t work properly at high frequencies?a. because of forward biasb. because of reverse biasc. because of breakdownd. because of charge storage 55. A microcomputer has 64 K memory, what is the hexadecimal notation for the first

memory location? a. 0FFF b. 1111 c. 0000 d. F000 56. 1991 saw the 'Tequila' virus outbreak. It was the first virus that could change its

signature (binary pattern) with each new replication in an attempt to escape detection from antivirus software. What's the term for this type of virus?

a. alcoholicb. polymorphicc. geneophicd. transmutant

57. A program that has the ability to replicate itself to your system and send out hundred or thousands of copies of itself without attachments leaving a devastating effect

a. computer virusb. bacteriac. wormd. Trojan Horse 58. It is a program that attached itself to other programs or files spreading from one

computer to another leaving infections as it travels.a. computer virusb. bacteriac. wormd. Trojan Horse 59. _______are also known to create a backdoor on your computer that gives malicious

users access to your system, possibly allowing confidential or personal information to be compromised. It appears to be a useful software but when activated the results vary.

a. Earthwormb. Gallup virusc. Trojan Horsed. Blaster Worm 60. A current surge takes place when a power supply is first tuned in becausea. transformer core is suddenly magnetizedb. the diodes suddenly start to conductc. the filter capacitor must be initially chargedd. arcing takes place in the switch

61. Repeated addition is one way to do multiplication. Program multiplication is used in most microprocessors because

a. this saves on memoryb. their ALUs can only add and subtractc. a separate instructions is needed for the twod. masking is needed 62. In magnetic field memory, the memory element consists of .a. plated wiresb. superconductive materialc. nickel iron alloyd. dopped aluminum 63. What do you call the filter between a corporate network and the internet that keeps the

corporate network secure from the intruders while giving corporate users unlimited access to the internet

a.bandstopb. bandpassc. firewalld. firestorm 64. For a good 0.05 uF paper capacitor, the ohmmeter reading shoulda. Go quickly to 100 ohms approximately and remain thereb. show low resistance momentarily and back off to a very high resistancec. show high resistance momentarily and then a very low resistanced. the pointer does not move at all

65. This widespread 2004 virus utilised a vulnerability in Windows and spread through an open FTP port. It replicated by randomly targeting IP addresses. What's the common name for this virus?

a. Rugratsb. Sasserc. Xoombied. Halimaw 66. Why would the rate at which electrical energy is used in an circuit be less than the

product of the magnitude of the ac voltage and current?a. because there are only resistances in the circuitb. because there are no reactances on the circuitc. because there is a phase angle that is greater than zero between the current and

voltaged. because there is a phase angle that is equal to zero between the current and voltage 67.World Wide Web(www) was made available in the internet in the summer of 1991 and

was developed by:a. Tim Berners Leeb. Jet Leec. Bill Gatesd. Ray Tomlinson 68. A piece of silicon doped with 7 x 1015 boron atoms/cm3 and 3 x 1015 phosphorus

atoms/cm3. The resulting material will bea. p-type with hole concentration more than electron concentrationb. p-type with electron concentration more than hole concentrationc. n-type with electron concentration more than hole concentrationd. n-type with hole concentration greater than electron concentration

69. Interaction between a CPU and peripheral device that takes place during the I/O operation is known as

a. handshakingb. footshakingc. flaggingd. relocating 70. The function f(x,y,z) = Σ (0, 1, 2, 4) is in what logic form?a. standardb. canonicalc. Besseld. both a and b 71. A system whereby computers and data storage are placed in dispersed locations

is known as:a. centralized processingb. distributed data processingc. summarizingd. package software 72. Addressing in which the location of the data is contained within the mnemonics

is known asa. immediate addressingb. implied addressingc. associated addressingd. direct addressing

73. Addressing in which the instruction contains the address of the data to be operated is known as

a. immediate addressingb. implied addressingc. associated addressingd. direct addressing 74. When all access and processing is done in one location, a computer system is said to

be:a. networkedb. centralizedc. distributedd. linked 75. A floppy disc is a a. thin magnetic oxide disc coated with plasticb. aluminum disc coated with magnetic oxide of ironc. thin magnetic oxide coated with a special material called carbond. thin plastic disk coated with magnetic oxide 76. A bus line consists of________.a. registersb. accumulatorsc. parallel data pathsd. machine cycles

 77. Most screen nowadays are LCD, what do you call the liquid crystal in the LCD?a. pneumatic fluidb. nematic fluidc. clean and refreshing mineral waterd. plasma 78. An emerging technology that provides non-volatile memory chip is.a. flash memoryb. CMOSc. PROMd. CISC 79. Negative feedback was developed by Harold Black and typically employed in

amplifiers to reduce what?a. feedback fractionb. error voltagec. distortiond. gains full control 80. Zener diodes are used in voltage regulation, as an engineer how are you going to

describe the breakdown voltage of a zener diode?a. its increasing exponentiallyb. its almost constantc. it destroy the zener dioded. well measured and apply to forward biased the zener diode