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Free download in PDF Electromagnetic Theory Objective Type Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries.
(21)
An Electrolytic Capacitor Is Generally Made To Provide
[A]
Variable Capacitance
[B]
Large Value Of Capacitance
[C]
Low Capacitance
[D]
Fixed Capacitance
Answer: Large Value Of Capacitance
(22)
If A Third Equal And Similar Charge Is Placed Between Two Equal And Similar Charges, Then This Third Charge Will
[A]
Remain In Stable Equilibrium
[B]
Be In Unstable Equilibrium
[C]
Move Out Of The Field Of Influence Of The Two Charges
[D]
None Of The Above
Answer: Remain In Stable Equilibrium
(23)
A Positive And A Negative Charge Are Initially 50 Mm Apart. When They Are Moved Close Together So That They Are Now Only 10 Mm Apart, The Force Between Them Will Be
[A]
10 Times Greater Than Before
[B]
25 Times Larger Than Before
[C]
5 Times Greater Than Before
[D]
None Of The Above
Answer: 25 Times Larger Than Before
(24)
To Prevent The Generation Of Static Charges On Rubber Or Flat Leather
[A]
Conductive Dressing Is Done
[B]
Talcum Powder Is Sprayed On The Surface
[C]
Surface Is Moistened
[D]
Oil Compound Dressing Is Done
Answer: Conductive Dressing Is Done
(25)
A Condenser Suitable For D.C. Only Is
[A]
Poled Aluminium Electrolytic Condenser
[B]
Oil Impregrated Paper Condenser
[C]
Metallic Plate Variable Gang Condenser
[D]
Metallic Paper Capacitor
Answer: Poled Aluminium Electrolytic Condenser
(26)
The Lines Of Force Due To Charged Particles Are
[A]
Sometimes Curved
[B]
Always Straight
[C]
Always Curved
[D]
None of these
(27)
The Electric Field At A Point Situated At A Distance D From Straight Charged Conductor Is
[A]
Inversely Proportional To D
[B]
Inversely Proportional To D
[C]
Proportional To D
[D]
None Of The Above
Answer: Inversely Proportional To D
(28)
The Ability Of Charged Bodies To Exert Force On 6ne Another Is Attributed To The Existence Of
[A]
Electric Field
[B]
Neutrons
[C]
Electrons
[D]
None Of The Above
(29)
A Dielectric Material Must Be
[A]
Good Conductor
[B]
Semi Conductor
[C]
Insulator
[D]
Resistor
(30)
Which Of The Following Is Not A Vector ?
[A]
Angular Momentum
[B]
Electric Field
[C]
Linear Momentum
[D]
Electric Potential
31
Two Plates Of A Parallel Plate Capacitor After Being Charged From A Constant Voltage Source Are Separated Apart By Means Of Insulated Handles, Then The
[A]
Voltage Across The Plates Decreases
[B]
Charge On The Capacitor Increases
[C]
Voltage Across The Plates Increases
[D]
Charge On The Capacitor Decreases
Answer: Voltage Across The Plates Decreases
32
Which Of The Following Statements Is Correct ?
[A]
Electrolytic Capacitor Must Be Con¬Nected In The Correct Polarity
[B]
Mica Capacitors Are Available In Capacitance Value Of 1 To 10 Pf
[C]
Air Capacitors Have A Blackband To Indicate The Outside Foil
[D]
None Of The Above
Answer: Electrolytic Capacitor Must Be Con¬Nected In The Correct Polarity
33
For Which Of The Following Parameter Variation, The Capacitance Of The Capacitor Remains Unaffected ?
[A]
Nature Of Dielectric
[B]
Thickness Of The Plates
[C]
Distance Between Plates
[D]
None of these
Answer: Thickness Of The Plates
34
Which Of The Following Capacitors Has Relatively Shorter Shelf Life ?
[A]
Electrolytic Capacitor
[B]
Paper Capacitor
[C]
Mica Capacitor
[D]
Ceramic Capacitor
Answer: Electrolytic Capacitor
35
In A Capacitive Circuit
[A]
Decrease In Applied Voltage Makes A Capacitor Charge
[B]
A Steady Value Of Applied Voltage Causes Discharge
[C]
An Increase In Applied Voltage Makes A Capacitor Charge
[D]
None Of The Above
Answer: An Increase In Applied Voltage Makes A Capacitor Charge
36
A Capacitor Consists Of
[A]
Two Conductors Only
[B]
Two Insulators Only
[C]
Two Conductors Separated By An In¬Sulator
[D]
Two Insulators Separated By A Con¬Ductor
Answer: Two Conductors Separated By An In¬Sulator
37
A Capacitor In A Circuit Became Hot And Ultimately Exploded Due To Wrong Con¬Nections, Which Type Of Capacitor It Could Be ?
[A]
Electrolytic Capacitor
[B]
Ceramic Capacitor
[C]
Paper Capacitor
[D]
Any-Of The Above
Answer: Electrolytic Capacitor
38
When 4 Volts E.M.F. Is Applied Across A 1 Farad Capacitor, It Will Store Energy Of
[A]
8 Joules
[B]
6 Joules
[C]
2 Joules
[D]
None Of The Above
39
For A Good 0.05 Uf Capacitor Ohmmeter Reading Should
[A]
Show High Resistance Momentarily And Then A Very Low Resistance
[B]
Go Quickly To 50 Ohm Approximately And Remain There
[C]
Show Low Resistance Momentarily And Back Off To A Very High Resis¬Tance
[D]
Not Move At All
Answer: Show Low Resistance Momentarily And Back Off To A Very High Resis¬Tance
40
While Testing A Capacitor With Ohm-Metre, If The Capacitor Shows Charging, But The Final Resistance Reading Is Appreciably Less Than Normal, It Can Be Concluded That The Capacitor Is
[A]
Open Circuited
[B]
Leaky
[C]
Alright
[D]
Short-Circuited
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