Font size
WorksheetsElectromagnetism and Electricity 12th Grade Q4 Quiz 1
Total questions: 40
Worksheet time: 28mins
Which of the following describes a phenomenon of inducing a voltage by changing the magnetic field around a conductor?
Electromagnetic induction
Faraday's induction
Generated voltage
Transformer induction
A strong permanent magnet is plunged into a coil and left in the coil. What is the effect produced on the coil after a short time?
The coil winding becomes hot.
The insulation of the coil burns out.
A high voltage is induced.
There is no effect.
What is the SI Unit for emf?
Farad
Ohm
EMF
Volt
As per Faraday's law of electromagnetic induction, an emf is induced in a conductor whenever it _________.
lies perpendicular to the magnetic flux
lies in a magnetic field
cuts magnetic flux
moves parallel to the direction of the magnetic field
Why do you need to swipe your credit card reader for it to accept your charge?
The magnetic field in the reader only works when the credit card is moving.
The current in the reader flows when the credit card strip is stationary.
The magnetic field in the credit card strip needs to move to induce a current in the reader.
The magnetic field in the credit card strip only exists when it is moving.
An induced emf is produced in _________________.
a close loop of wires when it remains at rest in a non-uniform static magnetic field.
a close loop of wires when it remains at rest in a uniform static magnetic field.
a close loop of wires moving at constant velocity in a non-uniform static magnetic field.
Lenz’s law concerning the direction of an induced current in a conductor by a magnetic field could be a restatement of?
Ampere’s Law
Ohm’s Law
Tesla’s Law
The Law of Conservation of Energy
The Law that states that the direction can induced current is such that its own magnetic field opposes the original change in magnetic flux that induced the current.
Law of conservation of energy
Faraday’s Law
Lenz’s Law
Which of the following statements is NOT true about DC current flow?
DC current flows from negative to positive
DC current flows at a constant rate
Battery-operated items are examples of DC power.
All DC-powered items need to be plugged in.
AC is produced by a generator and its charge is ________.
positive or negative.
positive and neutral.
negative and positive.
negative and negative.
The amount of force the electrons are moved in a circuit is called _______.
ampere
current
emf
voltage
The unidirectional current is called
alternating current
electric charge
direct current
indirect current
What is the function of a capacitor?
To capacitate
To consume energy
To resist current
To store energy as electric charge
What is being represented by the formula above?
Parallel capacitance
Parallel resistance
Series resistance
Series capacitance
In the formula C = Q / V, _____ is represented by "Q."
Capacitance
Charge
Quality
Potential Difference
It is known as the insulating layer of the capacitor.
(a)
If three resistors are connected in parallel,then effective resistance is ___ μF.
Given: C1=5μF; C2=10μF; C3=15μF
0.35
2.86
20.1
30.0
It is advisable to exceed the maximum holding value marked on the capacitor to keep it working.
True
False
Which resistor will prevent the most current flow?
1000 Ω
100 Ω
10 Ω
1 Ω
Comparing series vs parallel resistor circuits:
Series: voltage changes, current is constant
Parallel: both voltage AND current change
Series: Current changes, voltage is constant
Parallel: neither voltage nor current change
It is a change in magnetic flux which results to the production of current and electromotive force.
(a)
Who first showed that magnetism can cause electricity?
Ampere
Faraday
Maxwell
Oersted
