Electromagnetic Theory Quiz | Electromagnetic Theory Objective Type Questions and Answers

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Questions
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
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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

Answer: Always Curved
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

Answer: Electric Field
29 A Dielectric Material Must Be
A Good Conductor
B Semi Conductor
C Insulator
D Resistor

Answer: Insulator
30 Which Of The Following Is Not A Vector ?
A Angular Momentum
B Electric Field
C Linear Momentum
D Electric Potential

Answer: Angular Momentum
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

Answer: 8 Joules
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

Answer: Leaky

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