Resistance and Power MCQs

Question 1

One advantage of a carbon film resistor over a carbon composition resistor is:

Accepted Answer

less circuit noise

Answer

smaller size

Answer

higher wattage

Answer

poor tolerance

Question 2

If a metallic conductor has a positive temperature coefficient of resistance, then:

Accepted Answer

as voltage increases, current increases

Answer

as temperature increases, resistance decreases

Answer

as current increases, resistance decreases

Answer

as temperature increases, resistance increases

Question 3

If a calculator display was "0.00263," what would this answer be in percent?

Accepted Answer

0.26%

Answer

0.026%

Answer

2.63%

Answer

26.3%

Question 4

A 33 komega.gif resistor with a 20% tolerance checks out as ok with which of the following ohmmeter readings?

Accepted Answer

26400 ohms

Answer

24183 ohms

Answer

6600 ohms

Answer

39970 ohms

Question 5

For P = V2/R, a decrease in resistance should produce:

Accepted Answer

an increase in power

Answer

a decrease in power

Answer

an increase in ohms

Answer

a decrease in current

Question 6

After a lamp is turned on, its filament resistance will change to become:

Accepted Answer

more resistive

Answer

less resistive

Answer

cooler

Answer

brighter

Question 7

Wirewound resistors are usually used in circuits that have:

Accepted Answer

high current

Answer

negative temperature coefficients

Answer

low power

Answer

high voltage

Question 8

How is power dissipated in a resistor?

Accepted Answer

by heat

Answer

by resistance

Answer

by voltage

Answer

by current

Question 9

Resistance in a circuit is:

Accepted Answer

opposition to current

Answer

opposition to voltage

Answer

the same as current

Answer

the same as voltage