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PPSC Physics Chapter 6 Electricity and Magnetism MCQs With Answers
Question # 1
A plug connoted to a table lamp contains a 3 A fuse Why is the fuse needed.
Choose an answer
To increase the resistance of the circuit
To make it easier for the current to flow
To protect the wiring form overheating
To reduce the voltage across thelamp
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Question # 2
A straight wire carrying current will experience a force when placed in a uniform magnetic field if
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The current and field are parallel
The current and field are at an angle
the current and field are parallel in opposite directions
All of the above
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Question # 3
Two magnetic lines of force
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Out near the poles
Never cut each other
Cut at a neutral point
Cut according to position of the magnet
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Question # 4
Which of the following is an example of diamagnetic substances.
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Nickel
Chromium
Antimony
Cobalt
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Question # 5
If a di electric is placed between the plates of a capacitor, its capacitance.
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Decreases
Increases
Remains unaffected
Is zero
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Question # 6
What can be used as the unit of envery.
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N m-1
V A
W.s
V C-1
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Question # 7
Thermocouple is combination of.
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Thermocouples
Capacitors in parallel
Resistors in series
Ammeter and voltmeter
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Question # 8
The sum of the positive and negative peak values is known as.
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Peak value
Average value
Instantaneous value
Peak to peak value
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Question # 9
Force acting on a test charge between the plates of a parallel plate capacitor is F. If one of the plates is removed teh force on the same test charge will be.
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Zero
F/2
F
2 F
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Question # 10
A diode cn be used as
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Amplifier
Rectifier
Oscillator
Transistor
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Question # 11
A step up transformer has a turn ratio of 1:100 A voltage of 20 V is connected across the primary coil What is the secondary voltage.
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0.2 V
5 V
100 V
2000 V
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Question # 12
When a charged particle moves through a magnetic field it suffers a change in its
Choose an answer
Charge
Mass
Energy
Direction of motion
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Question # 13
The device in the circuit that consume electrical energy are known as.
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Resistors
Capacitors
Fuses
Load
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Question # 14
The basic quantity used to describe the state of magnetization of a substance is the
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Magnetic strength
Magnetic susceptibility
Magnetic moment
Magnetic moment per unit volume
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Question # 15
The electromagnetic waves propagated outing space from antenna of a transmitter are known as.
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Infrared waves
Light waves
Radio waves
X-rays
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Question # 16
If the transformer turns ratio is 2 and the impedance of primary coil is 250 Ohms then the impedance secondary coil will be.
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125 Ohms
250 Ohms
500 Ohms
1000 Ohms
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Question # 17
Which part of D.C motor reverses the direction of current through the coil every half cycle.
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The armature
The commutator
the brushes
The slips rings
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Question # 18
The highest value reached by the voltage or current in one cycle is its.
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Top value
Maximum value
Average value
Peak value
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Question # 19
Which of the given factors is increased in a step down transformer.
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Voltage
Current
Wattage
Resistance
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Question # 20
The charge per unit volt which is a constant property of the system is known as the
Choose an answer
Dielectric constant
Permitivity
Capactance
Inductance
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Question # 21
Magnetic lines of force due to earth's horizontal magnetic field are.
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Curved lines
Elliptical
concentric circles
Parallel and straight
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