Bài tập trắc nghiệm tiếng anh 12

1. .........use specially treated glass that can transmit signals in the form of pulsed beams of laser

light.

A. Copper wires    B. Electric wires     C. Telephone wires                 D. Fiber-optic cables

2. What does HDTV stand for?

A. High Definition TV                          B. High Distinction TV

C. Height Definition TV                       D. Height Distinction TV

3. Electronic signals typically travel along a medium such as.........or are carried over the air as........

A. radio waves/cooper wire                 B. cooper wire/radio waves

C. copper wire/radio waves                 D. radio waves/copper wire

4. A television camera uses a sensitive electronic tube to change light into.................impulses that can be transmitted to television...............

A. electrical/receivers              B. electronic/receivers

C. electrical/transmitters         D. electronic/ transmitters

5. In electronics, DAC is the abbreviation of………….

A. Alternative Direct Current               B. Digital - to - Analogue Convert

C. Access Direct Component D. Analogue Direct Current

6. A detection device used to detect movement within a range

A. Magnetic Switch     B. Motion Sensor

C. Break Detector       D. Pressure mat

7. When a burglar breaks the window’s glass, alarm system is activated because of this device.

A. Magnetic Switch                 B. Motion Sensor

C. Break Detector                   D. Pressure mat

8. The alarm system will be reset after a long hours of sounding because of this feature

A. Automatic cut-off                 B. Entry and exit delay

C. Tamper protection              D. Battery backup

9. Wireless telecommunications use........................, sent through space from one antenna to another, as a medium for communications.

A. radiation waves       B. microwaves             C. long waves D. radio waves

10. The value of a resistor coded with red, red and brown respectively.

A. 220 ohms                B. 330 ohms                C. 220 kilohms            D. 330 kilohms

11. Communications.................receive TV signals from a ground station, amplify them and relay them back to the earth over an antenna.

A. cables         B. satellites     C. signals       D. stations

12. ................is defined as devices and systems that transmit electronic or optical signals across long distances.

A. Communications                 B. Telecommunications

C. Telegraphs             D. Telephones

13. “Point-to-multipoint” telecommunications is referred to................

A. personal messages                        B. personal communications

C. telephone conversations                D. broadcasts

14. In telecommunications, a..................creates and emits radio waves

A. transmitter               B. receiver       C. generator               D. accelerator

15. Telegraphs, telephones, radio and TV all work by modifying signals and are known

as..........transmission.

A. digital          B. analog         C. relay            D. direct

16. Computers and other types of .............. equipment transmit...................information.

A. electronic/digital                  B. electronic/analog

C. electrical/digital                   D. electrical/analog

17. In digital transmission, ................numbers are used to measure different qualities of the messages.

A. decimal                   B. arithmetic                C. mathematic                         D. binary

18. Thanks to TV, people are better..............about what is going on in the world than they used to be.

A. instructed                B. educated     C. prepared     D. informed

19. You need a/an............to convert computer data into form that can be transmitted over the phone lines.

A. account                   B. modem                    C. memory                  D. signal

20. Did you see that interesting program.........................television last night?

A. at                 B. on                C. in                 D. over