Voltage and Current MCQs : This section focuses on the "Voltage and Current". These Multiple Choice Questions (MCQs) should be practiced to improve the Voltage and Current skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
If the current in a circuit equals 0 A, it is likely that the
A. voltage is too high
B. resistance is too low
C. circuit has a short
D. circuit is open
A switch is a device that:
A. short circuits complex circuits
B. holds a fuse
C. has double poles
D. opens or completes a current path
An example of potential energy is:
A. tea-kettle steam
B. a moving vehicle
C. the sun
D. a battery
What are the unit and symbol for current?
A. Ampere, A
B. Coulomb, I
C. Ampere, Q
D. Ampere, I
If an electrical system is compared to a fluid system, the electrical current corresponds to the:
C. water wheel
D. water flow
If a fluid system is compared to an electrical system, the fluid pump will correspond to a:
A. the presence of a positive charge
B. the abundance of electrons
C. the movement of electrons
D. the repulsion of electrons
Which is the smallest?
Batteries differ from fuel cells in that
A. a battery is a closed system
B. a battery uses hydrogen and oxygen to create electricity
C. a battery uses a polymer electrolyte membrane
D. none of the above
The negative and positive charge symbols are assigned (in that order) to the:
A. proton and electron
B. electron and proton
C. atom and nucleus
D. electron and element
Which resistive component is designed to be temperature sensitive?
D. Photoconductive cell
In which states may matter may be found?
A. solid, liquid, or mineral
B. solid, gas, or liquid
C. mineral, gas, or liquid
D. plastic, solid, or gas
What are the basic building blocks that all matter is composed of?
A. electrons, neutrons, and protons
B. two protons for each neutron
C. two protons for each electron
D. electrons, neutrons, and charged ions
Which of the following statements is true?
A. Unlike charges repel and like charges attract.
B. Like charges repel and unlike charges attract.
C. Unlike charges attract and like charges attract.
D. Like charges repel and unlike charges repel.
A basic electric circuit is made up of what components?
A. A load, a resistor, and a conductive path for current
B. A voltage source, a load, and a conductive path for current
C. A voltage source, a conductive path for current, and a battery
D. A conductive path for current, a battery, and a copper wire
If 40 C of charge flow past a point in 20 s, what is the current?
A. 2:00 AM
B. 0.5 A
C. 20 A
D. 40 A
The charge of one coulomb is equal to:
A. 6.24 x 10−18 electrons
B. one ampere
C. one second
D. 6.24 x 1018 electrons
What is the name of the pressure that moves electrons in a closed circuit?
A lead-acid battery is an example of a
A. solar cell
B. fuel cell
C. primary battery
D. secondary battery
An ammeter is used to measure
D. All of the above
Which part of an atom has no electrical charge?
D. All of the above
When considering conventional current versus electron current flow:
A. electron current flow came first
B. protons move in conventional current flow
C. conventional current flow came first
D. the direction of current is the same in both methods
How many valence shell electrons are there in semiconductor atoms?
What do you call a diagram that shows the electrical connections of a circuit's components?
A. A schematic diagram
B. A pictorial diagram
C. A block diagram
D. An electrical diagram
Primary batteries, unlike secondary batteries, may be:
A. charged once
B. used once
C. recharged over and over
D. stored indefinitely
The basic difference between a fuse and a circuit breaker is
A. a fuse is slower
B. a fuse is reusable
C. a circuit breaker is reusable
D. a circuit breaker is more reliable
A secondary cell generates dc via chemical activity a primary cell generates dc:
A voltage will influence current only if the circuit is:
C. high resistance
An element is a substance that is:
A. varied throughout the entire piece
B. used only in electronics
C. electrically charged
D. found only in its pure form
Which unit of charge contains 6.25 × 1018 electrons?
A. An ampere
B. A coulomb
C. A volt
D. A joule
Material that consists of a mixture of elements is considered to be:
A. an element
B. an ion
C. a compound
D. a molecule
The term used to designate electrical pressure is:
Which voltage source converts chemical energy to electrical energy?
A. Electrical generator
C. Solar cell
D. Electronic power supply
The removal of a non-neutral subatomic particle converts the atom into a:
A. charged ion
C. heavier element
In practical applications, battery voltage:
A. is restored as soon as disconnect occurs
B. is lowered as the load increases
C. may be stored indefinitely
D. will be reduced to zero as power is drawn
A short circuit will have:
A. a small current flow
B. a large current flow
C. no current flow
D. some current flow
If 60 J of energy are available for every 15 C of charge, what is the voltage?
A. 4 V
B. 60 V
C. 15 V
D. 0.25 V
What is a characteristic of a secondary cell?
B. not rechargeable
C. a dry cell
A voltmeter is used:
A. to measure current
B. in series with the circuit
C. in parallel with the circuit
D. to measure coulombs
Which electronics material opposes the movement of free electrons?
One coulomb passing a point in one second is one:
Current is considered as the movement of:
An atom's atomic number is determined by the number of:
A. neutrons minus protons