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WorksheetsQuiz Time
Total questions: 20
Worksheet time: 10mins
Most metals are good conductors. Why?
Their molecules are close together.
They have high melting point.
They have many intermolecular spaces through which current can flow.
They have a large number of free electrons.
What is the purpose of a load in an electric circuit?
To decrease the current
To increase the resistance
To utilize the electric energy
To share some of the currents
How do you call a device commonly used for remote switching of high current circuits?
Solenoid
Electromagnet
Potentiometer
Relay
Car batteries are rated in "ampere-hour". this is a measure of their __________.
emf
charge
power
current
One newton-meter is the same as which one?
Volt
Coulomb
Watt
Joule
A shorted coil can be detected by __________.
high resistance
low resistance
overheated coil
both A and B
Which of the following is true in a circuit containing two unequal resistances in parallel?
Current is the same in both
Large current flows in larger resistor
Smaller resistances has smaller conductance
Potential difference across each is the same
The term "electric pressure" is the same as which of the following?
Circuit current
Voltage
Power demand
Energy consumption
Which of the following statement is true?
A rheostat needs three terminals
An open resistor has a resistance of zero ohm
Carbon resistors can have a power rating less than 2 W
Wire-round resistors cannot be used for a rheostat
The resistance of a material varies inversely to which of the following?
Length of the material
Cross-sectional area
Temperature of the material
Resistivity of the material
A passive element in a circuit is one which ________.
receives energy
supplies energy
both receives and supplies energy at the same time
transforms energy from one circuit to another
What is the SI Unit of specific resistance?
Ohm
1/ohm
Ohm/meter
Ohm-meter
Which of the following is true about an ideal voltage source?
It has a large emf with a large internal resistance
It has a small emf with a small internal resistance
It has any value of emf with a zero internal resistance
It has zero emf with a zero internal resistance
A good conductor has a high ___________.
resistance
impedance
conductance
reluctance
What is the SI unit of electrical current?
Ampere
Volt
Watt
Ohm
P
Which of the following is the unit of conductance?
Ohm-meter
Ohm/meter
Daraf
Mho
Which of the following are the minimum requirements in order for current to flow?
A voltage source and a resistor
A voltage source and a insulator
A voltage source and a conductor
A voltage source, a conductor and a insulator
Current passing through a circuit produces which of the following effects?
Chemical effects
Magnetic effects
Thermal effects
Luminous effects
Which of the following materials has nearly a zero temperature coefficient of resistance?
Carbon
Manganin
Copper
Tungsten
Which of the following units indicates the rate at which energy is expanded?
Volt
Coulomb
Ampere-hour
Watt
