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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
The rectangular coil in galvanometer is made up of.
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Bare copper wire
Insulated aluminum wire
Enameled copper wire
Enameled steel wire
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Question # 3
If a resistance is connected in parallel with a galvanometer the resulting instrument is called.
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A voltmeter
An ammeter
A wattmeter
A potentiometer
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Question # 4
What units are used to rate electrical fuses.
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Volts
Ampere
Watts
Hertz
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Question # 5
The process due to which current flows only during alternate half cycle is known as.
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Filtration
saturation
Half wave rectification
Full wave rectification
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Question # 6
Which are the following describe the study of static magnetic fields.
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Electrodynamics
Megnetostatic
Electrostatic
Paraamagnetism
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Question # 7
An A.C. dynamo operates on the principle of
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Mutual induction
Self induction
Electromagnetic induction
Mechanical induction
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Question # 8
What does a dynamo generate
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Electrons
Emf
anion
Cation
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Question # 9
What is used in an electric circuit to allow current in one direction only.
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A fuse
An ammeter
A diode
A relay
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Question # 10
Ohm's law is applicable to
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Ohmic and non ohmic devices only
Semiconductors only
Metals only
Insulators only
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Question # 11
If the transformer turns ratio is 2 and the impedance eof 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 # 12
The field inside a hollow spherical conductor is.
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Constantin zero
Constant but not necessarily zero
A function of charge on sphere
a function of distance from the centre
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Question # 13
Which one is not a semiconductor.
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Go As
Ge
Sc
In
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Question # 14
Which electrical component uses a low current circuit to switch a high current ON or OFF.
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Capacitor
Diode
Reed rely
Thermistor
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Question # 15
What happens to the energy of a charged condenser is plate separation is increased.
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It decreases
It increases
It becomes zero
It remains unchanged
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Question # 16
The impedance of the circuit at resonance frequency is
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Minimum
Maximum
Zero
Infinity
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Question # 17
In comparison with the electrostatic force between two electrons the electrostatic force between two protons is.
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Zero
Smaller
Greater
Same
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Question # 18
They hysteresis losses are eliminated in power transformer by using
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Low resistivity power winding
Low reflectance steel cores
Laminated steel cores
soft iron cores
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Question # 19
The building up of electric charge on the surface of objects is termed as.
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Static electricity
Electric charge
Electric current
Electrostatic induction
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Question # 20
The coulomb's law is valid for the charges which are.
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Moving and point charges
Moving and non point charges
Stationary and point charges
Stationary and large size charges
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Question # 21
Inserting a di electric between the plates of a charged parallel plate capacitor.
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Decrease the capacitance
Leaves teh capacitance the same
Encourages breakdown between the plates
Reduces the electric intensity between the plates
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