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Electronics Pre-Test questions

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Hey I am currently a sophmore in college and just had a few questions about electronics. I hope you'll have fun answering some of them but please dont just randomly guess =P.

Alright there are 22 questions about electronics and I bolded the answers to it but I was told that four of them are wrong ( 3 Multiple checks, 1 single check) It would mean a lot to me if you could find out which ones I answered wrong because I really would like to know my errors but I couldn't find them.

1. Which of the following are characteristics of fiber optic light receivers? (Choose two.)
a) react to multiple wavelengths
b) react to a specific wavelength
c) tuned to one wavelength for noise reduction
d) use PIN photodiodes to convert light pulses to electrical signals

2. Which of the following are attributes of singlemode fiber optic cable? (Choose two.)
a) one path of light
b) larger fiber optic core
c) uses LEDs as a light source
d) distances up to 5000 meters
e) higher bandwidth than multimode

3. Which devices could cause problems with a wireless transmission? (Choose two.)
a) radio
b) TV
c) microwave
d) wireless phone
e) DVD remote control

4. Which of the following are typical specifications for data transmission cables? (Choose three.)
a) achievable bit transmission speeds
b) supported data encoding schemes
c) minimum distance between hosts
d) maximum distance before fatal attenuation
e) intended transmission type
f) intended bit level protocols type

5. Which combinations of charges will be repelled by electric force? (Choose two.)
a) neutral and neutral
b) neutral and positive
c) neutral and negative
d) positive and positive
e) positive and negative
f) negative and negative

6. Which of the following describe the ray model of light? (Choose three.)
a) Light bends at the boundary of two transparent materials.
b) The speed of light is greatest when passing through optical glass.
c) The speed of light is constant no matter what material passes through.
d) The optical density of the material determines how much the light will bend.
e) The index of refraction is the ratio of the speed of light in a material compared to a vacuum.

7. Which term refers to the amount of signal power loss that can be tolerated on a fiber optic link?
a) linear laser light loss
b) optical link loss budget
c) acceptable decibel power reduction
d) maximum allowable light attenuation

8. Which of the following identifies a node that has been authenticated but not yet associated with the access point?
a) unauthenticated and unassociated
b) unauthenticated and associated
c) authenticated and unassociated
d) authenticated and associated

9. Which of the following wireless standards increased transmission capabilities to 11 Mbps?
a) 802.11a
b) 802.11b
c) 802.11c
d) 802.11d

10. Which of the following must be present for current to flow? (Choose three.)
a) closed loop
b) resistance
c) insulating material
d) source of voltage
e) conducting material
f) bit generating device

11. Your company has a new wireless network setup in their building. The boss has heard the throughput for a wireless network would be 11 Mbps. You mention that because of the way WLANs transmit and acknowledge data the actual percentage of throughput would be which of the following?
a) 25%
b) 40%
c) 50%
d) 70%

12. Which effects comprise impedance? (Choose three.)
a) capacitance
b) voltage
c) current
d) resistance
e) inductance
f) power

13. Select the characteristics specified by 10BaseT. (Choose three.)
a) twisted pair cable
b) T style connectors
c) baseband transmission
d) 10 gigabits per second data rate
e) 10 megabits per second data rate
f) decimal encoded data transmission

14. Which of the following are benefits of coaxial cable within a LAN environment? (Choose two.)
a) easier to install than UTP
b) less expensive than fiber
c) requires fewer repeaters than UTP
d) easily accommodates additions to network
e) faster transport speeds than fiber

15. Which two are necessary to achieve total internal reflection within a fiber-optic cable? (Choose two.)
a) The entire incident light ray must be refracted into the cladding.
b) The index of refraction of the core must be less than that of the cladding.
c) The index of refraction of the core must be greater than that of the cladding
d) The optical density of the reflecting material must be higher than the refracting index
e) The angle of incidence of the light ray must be greater than the critical angle for the core and cladding

16. Which tasks must be performed when installing fiber optic cable? (Choose three.)
a) install connectors
b) inspect laser signal using a microscope
c) cleave and polish cable ends
d) wash cable ends with mild soap and water
e) protect connector ends from dirt and damage
f) pull cables tight to reduce the number of bends and twists

17. How is full-duplex capability achieved in fiber optic cable?
a) Two fibers are encased in separate sheaths
b) Light is bounced at different rates in opposite directions.
c) Transmit speeds are so high that half-duplex is acceptable.
d) Colors of the light spectrum are separated into transmit and receive streams.

18. Which factors can lead to a loss of signal strength in fiber optic cable? (Select three.)
a) absorption
b) RFI
c) crosstalk
d) scattering
e) dispersion
f) EMI

19. What is the minimum number of devices that can exist in a wireless network?
a) 1
b) 2
c) 3
d) 4

20. Which of the following characteristics describe STP cable? (Choose three.)
a) costs more than UTP
b) easier to install than UTP
c) uses the shield to carry data signals
d) twisted pairs are not required because of the shield
e) must be grounded at both ends for high frequency signals
f) reduces both internal and external sources of interference

21. Which of the following radio carrier signal modulation types will modulate the height (amplitude) of the carrier signal?
a) AM
b) FM
c) PM
d) RF

22. What is the core size of a single mode fiber-optic cable?
a) 8-10 microns
b) 15 microns
c) 50-60 microns
d) 125 microns

PS: I ll come up with more questions soon if you liked it =P

Again thanks a lot,
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