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WorksheetsIOT Quiz #1 - Electricity, Electrons, Electronics
Total questions: 40
Worksheet time: 20mins
Electric current originates from which part of an atom?
nucleus
entire atom acting as a unit
positively charged protons
negatively charged electrons
Which of the following is true of electrical forces?
Like charges attract, unlike charges repel.
Electrical forces are produced by electrical charges.
Positive and negative charges can combine to produce a third type.
Electrical forces are weaker than gravitational forces.
How can electric charge be established?
Electrons can be removed from atoms and accumulated to produce a negative charge.
Atoms from which electrons have been removed produce positive electric charge.
Both A and B.
Neither A nor B.
When a person combs her hair, static electricity is sometimes generated by what process?
Friction between the comb and hair transfers electrons.
Induction between the comb and hair.
Deduction between the comb and hair.
Contact between the comb and hair results in a charge.
The resistance of the wire varies inversely as:
Area of cross section
Resistivity
Length
Temperature
Voltage is a form of:
Kinetic energy
Potential energy
both Potential and Kinetic energy
None of the above
The ratio of voltage and electrical current in a closed circuit:
Decreases
Increases
Remains constant
Varies
The curve representing Ohms law is a:
Linear
cosine function
Parabola
Hyperbola
Ohm’s law states which relationship between electrical quantities?
volts = current times resistance
volts = current divided by amps
volts = coulombs divided by charge
volts = resistance times charge
Resistance is a measure of a material’s opposition to
voltage
current
electric force
movement of protons
Electric current is defined as a flow of
electric charge in units of volts per s
protons in units of protons per s
electric charge in units of coulomb per s
electrons in units of electrons per s
What are the basic components of a simple electric circuit?
energy source
connecting wires
switch
All the above
To produce a electric current what is the requirement?
A voltage source
A source of energy that moves charges
An electric field moving through a conductor
Any of the above
Which of the following is not an electrical classification of materials?
Semiconductors
Semi-insulators
Insulators
Conductors
Give the name of materials which contain lots of free electrons.
insulators
conductors
semiconductors
None of the above
Which of the following is not a type of energy source?
generator
solar cell
rheostat
battery
When two positively charged materials will placed close together then :
it will repel each other
become negative
it will attract each other
None of the above
Electrons in the outer orbit are called
shells
valences
nuclei
All the above
A series circuit consists of three resistors with values of 140 , 250 , and 220 . The total
resistance is
330
610
720
None of the above
When will current flow in a circuit?
a switch is closed
a switch is opened
switch is either open or closed
None of the above
The unit of electrical charge is the
coulomb
volt
joule
watt
When one of three series resistors is removed from a circuit and the circuit is
reconnected, the current
increases by half
increases
decreases by half
None of the above
If a 24 V and a 10 V battery are series opposing, the total voltage is
14 V
10 V
24 V
34 V
A series circuit consists of three resistors. Two resistors are 1.4 k each. The total
resistance is 12 k. The value of the third resistor
92 k ohm
920 ohm
9200 ohm
None of the above
A 430 resistor, a 210 resistor, and a 100 resistor are all in parallel. The total resistance is:
0.017 ohm
58.82 ohm
58.82 kilo ohm
None of the above
The SI unit of power is_________.
Joule
Ampere
Watt
Ohm
According to Ohm’s law, if voltage increases and resistance stays the same:
resistance decreases
current increases
current remains the same
current decreases
The instrument used for measuring electric current is :
galvanometer
ammeter
voltmeter
potentiometer
The amount of work done in joules, when one unit electric charge moves from one point to another point in an electric circuit is called :
resistance
potential difference
current
charge
The resistance of material depends on :
temperature
length of conductor
area of cross-section
All the above
The relation between potential difference (V) and current (I) is :
V α I
V α I2
V α 1/I
None of the above
The relation between potential difference (V) and current (I) was discovered by :
Volt
Ohm
Newton
Ampere
What is the most commonly used conductor in electronics?
copper
aluminum
gold
silver
Give the name of components which is designed to oppose the flow of current.
capacitor
resistors
inductor
EMF
What are the different parts of a rheostat?
only wiper
wiper and resistor track
armature
only resistor track
The SI unit of electric current is :
ohm
volt
ampere
watt
The rate of flow of an electric charge is known as :
electric potential
electric resistance
electric current
None of the above
An ideal voltmeter would have an:
Infinite resistance
Very low resistance
Double the resistance
Resistance equal to the circuit
Resistance ‘R’ of a wire of length “L” is given by the relation:
R=L/Ρa
R=L/A
R=ρL/A
None of the above
The unit of emf is ___________.
volt
Joule
Ampere
Watt
