单选题If the resistance of a circuit is cut in half and the applied voltage is kept constant, the current flow will be （）.A doubledB quadrupledC unchangedD cut in half

题目

单选题

If the resistance of a circuit is cut in half and the applied voltage is kept constant, the current flow will be （）.

doubled

quadrupled

unchanged

cut in half

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相似问题和答案

第1题：

Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet? (Select two answer choices.)

A．Full-duplex Ethernet uses CSMA/CD to prevent collisions.

B．Half-duplex Ethernet uses a loopback circuit to detect collisions.

C．A full-duplex Ethernet card allows 20Mbps for data transmission.

D．Full-duplex Ethernet makes use of two pairs of wires for data.

E．An Ethernet hub can operate both half and full duplex simultaneously.

正确答案：BD
解析：Explanation:
Half-duplex Ethernet send and receives on the same line, so a loopback needs to be set to detect collisions. Alternatively, full-duple Ethernet doesn't have to because it uses two pairs of wire, one to send and the other to receive. Collisions are not possible on full duplex Ethernet networks.

Incorrect Answers:
A. Full duplex uses both pairs of wires, so transmissions are sent on the first pair, and data that is received come in on the other pair. This prevents collisions.

C. Full duplex allows for data to be sent and received at the same time. It will not double the amount of bandwidth at any given time. The speed of the Ethernet link will remain at 10/100.

E. Hubs are shared devices and can only support one mode, unlike switches.

第2题：

The technician notices that one of the wires in a CAT5 cable is cut in half. Which of the followingconnectivity issues did the technician discover?()

A.Open pairs

B.Attenuation

C.Crosstalk

D.Interference

参考答案：A

第3题：

You want to upgrade the Ezonexam LAN so that all ports operate in full duplex mode. Which statement is true about full-duplex Ethernet when comparing to half-duplex Ethernet?

A．Full-duplex Ethernet consists of a shared cable segment. Half-duplex provides a point-to-point link

B．Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receive

C．Full-duplex Ethernet can provide higher throughput than can half-duplex Ethernet of the same bandwidth

D．Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex Ethernet uses a jam signal

E．None of the above

正确答案：C

第4题：

According to Ohm’s Law， which of the following is correct？（）

A、As voltage increases， resistance decreases
B、As amperage decreases， resistance decreases
C、As resistance decreases， amperage increases
D、As resistance increases， voltage increases

正确答案:C

第5题：

If an attempt is made to hoist a load that exceeds the capacity of an electric winch，an overload safety device causes a circuit breaker to cut off the current to the winch motor ______．

A.when the line pull reaches the rated winch capacity

B.after the line pull exceeds the rated winch capacity

C.after a short build-up of torque

D.immediately

正确答案：B

第6题：

Please explain how we describe the resistance in semiconductor. Compare the resistance of a metal,poly and diffusion in tranditional CMOS process.（威盛笔试题circuit design-beijing-03.11.09）

正确答案：

第7题：

The total resistance of a parallel circuit is always______.

A.larger than the greatest branch resistance

B.smaller than the lowest branch resistance

C.equal to the sum of the individual branch resistances

D.one-half the sum of the individual branch resistances

正确答案：B

第8题：

The Ezonexam LAN is upgrading all devices to operate in full duplex. Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet?

A．Full-duplex Ethernet uses two wires to send and receive. Half-duplex Ethernet uses one wire to send and receive

B．Full-duplex Ethernet consists of a shared cable segment. Half-duplex Ethernet provides a point-to-point link

C．Full-duplex Ethernet can provide higher throughout than can half-duplex Ethernet of the same bandwidth

D．Full-duplex Ethernet uses a loopback circuit to detect collisions. Half-duplex ethernet uses a jam signal

E．None of the above

正确答案：C

第9题：

Which of the following statements correctly describe the differences between half-duplex and full-duplex Ethernet?（）

A、Full-duplex Ethernet uses CSMA/CD to prevent collisions.
B、Half-duplex Ethernet uses a loopback circuit to detect collisions.
C、A full-duplex Ethernet card allows 20Mbps for data transmission.
D、Full-duplex Ethernet makes use of two pairs of wires for data.
E、An Ethernet hub can operate both half and full duplex simultaneously.

正确答案:B,D

第10题：

The technician notices that one of the wires in a CAT5 cable is cut in half. Which of the followingconnectivity issues did the technician discover?（）

A、Open pairs
B、Attenuation
C、Crosstalk
D、Interference

正确答案:A

If the resistance of a circuit is cut in half and the applie

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