88 + Mcqs in Electrostatics Page 1 McqOptions

1.	In the case of a lossy capacitor, its series equivalent resistance value will be
A.	mall
B.	ery small
C.	arge
D.	ero
Answer» D. ero

Discussion

2.	Which of the following capacitor is preferred in case of single phase motor ?
A.	ica capacitor
B.	aper capacitor
C.	lectrolytic capacitor
D.	eramic capacitor
Answer» D. eramic capacitor

Discussion

3.	Which of the following capacitors has relatively shorter shelf life ?
A.	ica capacitor
B.	lectrolytic capacitor
C.	eramic capacitor
D.	aper capacitor
Answer» C. eramic capacitor

Discussion

4.	This mention statement is associated with "The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface".
A.	auss's law
B.	irchhoff's law
C.	araday's law
D.	enz's law
Answer» B. irchhoff's law

Discussion

5.	1 volt/meter is same as
A.	meter/coulomb
B.	newton/meter
C.	newton/coulomb
D.	joule/coulomb
Answer» D. joule/coulomb

Discussion

6.	The dielectric constant (relative permittivity) of glass is given by
A.	.1 to 0.4
B.	.5 to 1.0
C.	.0 to 4.0
D.	to 100
Answer» E.

Discussion

7.	A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is
A.	00 kV/m
B.	0 kV/m
C.	kV/m
D.	kV/m
Answer» B. 0 kV/m

Discussion

8.	Electric intensity at any point in an electric field is equal to the at that point.
A.	lectric flux
B.	agnetic flux density
C.	otential gradient
D.	one of the above
Answer» D. one of the above

Discussion

9.	A capacitance of 100 fiF is connected in series with a resistance of 8000 £2. The time constant of the circuit is
A.	.2 s
B.	.4 s
C.	.6 s
D.	.8 s
Answer» E.

Discussion

10.	The direction of electric field due +0 positive charge is .
A.	way from the charge
B.	owards the charge
C.	oth (A) and (B)
D.	one of the above
Answer» B. owards the charge

Discussion

11.	Paper condenser is
A.	lways polarised
B.	sually of fixed value
C.	lectrolytic condenser
D.	variable condenser
Answer» C. lectrolytic condenser

Discussion

12.	A field line and an equipotential surface are
A.	lways parallel
B.	lways at 90°
C.	nclined at any angle 0
D.	one of the above
Answer» C. nclined at any angle 0

Discussion

13.	Which of the following is not a vector ?
A.	inear momentum
B.	ngular momentum
C.	lectric field
D.	lectric potential
Answer» E.

Discussion

14.	The electrostatic force between two charges of one coulomb each and placed at a distance of 0.5 m will be
A.	6 x 10 fa
B.	6 x 107 N
C.	6 x 108 N
D.	6 x 109 N
Answer» E.

Discussion

15.	The total deficiency or excess of electrons in a body is known as
A.	urrent
B.	oltage
C.	otential gradient
D.	harge
Answer» E.

Discussion

16.	For a good 0.05 uF capacitor ohmmeter reading should
A.	how low resistance momentarily and back off to a very high resistance
B.	how high resistance momentarily and then a very low resistance
C.	o quickly to 50 ohm approximately and remain there
D.	ot move at all
Answer» B. how high resistance momentarily and then a very low resistance

Discussion

17.	The property of a capacitor to store electricity is called its
A.	apacitance
B.	harge
C.	nergy
D.	one of the above
Answer» B. harge

Discussion

18.	Which of the following expression is correct for electric field strength ?
A.	= D/E
B.	= D2/t
C.	= jtD
D.	0
Answer» B. = D2/t

Discussion

19.	An uncharged conductor is placed near a charged conductor, then
A.	he uncharged conductor gets charged by conduction
B.	he uncharged conductor gets charged by induction and then attracted towards the charging body
C.	he uncharged conductor is attracted first and then charged by induction
D.	t remains as such
Answer» C. he uncharged conductor is attracted first and then charged by induction

Discussion

20.	The capacitor preferred for high frequency circuits is
A.	ir capacitor
B.	ica capacitor
C.	lectrolytic capacitor
D.	one of the above
Answer» C. lectrolytic capacitor

Discussion

21.	For which of the following parameter variation, the capacitance of the capacitor remains unaffected ?
A.	istance between plates
B.	rea of the plates
C.	ature of dielectric
D.	hickness of the plates
Answer» E.

Discussion

22.	The ohmmeter reading for a short circuited capacitor is
A.	nfinity
B.	ew kilo ohms
C.	ew megohms
D.	ero
Answer» E.

Discussion

23.	Out of the following capacitors of identical rating which one will have the smallest dimensions ?
A.	luminium foil capacitor
B.	ica capacitor
C.	eramic capacitor
D.	aper capacitor
Answer» D. aper capacitor

Discussion

24.	A unit tube of flux is known as tube
A.	ewton
B.	araday
C.	ichale
D.	one of the above
Answer» C. ichale

Discussion

25.	A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance ?
A.	eramic capacitor
B.	ica capacitor
C.	oth will have identical value of capacitance
D.	t depends on applied voltage
Answer» B. ica capacitor

Discussion

26.	The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be
A.	00 N/C
B.	00 N/C
C.	00 N/C
D.	200 N/C
Answer» D. 200 N/C

Discussion

27.	A paper capacitor is usually available in the form of
A.	ubes
B.	olled foil
C.	isc
D.	eshed plates
Answer» C. isc

Discussion

28.	A capacitor consists of two
A.	eramic plates and one mica disc
B.	nsulators separated by a dielectric
C.	ilver-coated insulators
D.	onductors separated by an insulator
Answer» E.

Discussion

29.	The time constant and R-C circuit may also be defined as the time during which the charging current falls to ______ percent of its initial maximum value,
A.	7
B.	2
C.	3
D.	3
Answer» B. 2

Discussion

30.	Dielectric strength of a medium is usually expressed in
A.	/mm
B.	/m²
C.	V/mm
D.	/mm
Answer» D. /mm

Discussion

31.	The value of E within the field due to a point charge can be found with the help of
A.	araday’s laws
B.	irchhoff's laws
C.	oulomb’s laws
D.	one of the above
Answer» D. one of the above

Discussion

32.	The number of Faraday tubes of flux passing through a surface in an electric field is called
A.	lectric flux
B.	lectric flux density
C.	agnetic flux density
D.	lectric charge density
Answer» B. lectric flux density

Discussion

33.	The capacity of capacitor bank used in power factor correction is expressed in terms of
A.	W
B.	VA
C.	VAR
D.	olts
Answer» D. olts

Discussion

34.	When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of
A.	joules
B.	joules
C.	joules
D.	joules
Answer» E.

Discussion

35.	Permittivity is expressed in
A.	arad/sq-m
B.	arad/meter
C.	eber/meter
D.	eber/sq-m
Answer» C. eber/meter

Discussion

36.	Mica capacitors are characterised by all of the following except
A.	table operation
B.	ccurate value
C.	ow leakage reactance
D.	ow losses
Answer» D. ow losses

Discussion

37.	If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will
A.	ecrease
B.	ncrease
C.	emains unchanged
D.	ecome zero
Answer» C. emains unchanged

Discussion

38.	Capacitance increases with
A.	ncrease in plate area and decrease in distance between the plates
B.	ncrease in plate area and distance between the plates
C.	ecrease in plate area and value of applied voltage
D.	eduction in plate area and distance between the plates
Answer» B. ncrease in plate area and distance between the plates

Discussion

39.	Which is the most superior dielectric out of the following ?
A.	ir
B.	lass
C.	akelite
D.	aper
Answer» D. aper

Discussion

40.	“The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface”.The above statement is associated with
A.	auss’s law
B.	irchhoff's law
C.	araday’s law
D.	enz’s law
Answer» B. irchhoff's law

Discussion

41.	"The total electric flux through any closed surface surrounding charges is equal to the amount oflcharge enclosed".The above statement is associated with
A.	oulomb’s square law
B.	auss’s law
C.	axwell’s first law
D.	axwell’s second law
Answer» C. axwell’s first law

Discussion

42.	If a third equal and similar charge is placed between two equal and similar charges, then this third charge will
A.	ove out of the field of influence of the two charges
B.	emain in stable equilibrium
C.	ot be in equilibrium
D.	e in unstable equilibrium
Answer» C. ot be in equilibrium

Discussion

43.	capacitors are mainly used for radio frequency tuning.
A.	aper
B.	ir
C.	ica
D.	lectrolytic
Answer» C. ica

Discussion

44.	Dielectric strength ______ with increasing thickness
A.	ncreases
B.	ecreases
C.	emains unaltered
D.	one of the above
Answer» C. emains unaltered

Discussion

45.	The minimum value of potential gradient in a cable occurs in
A.	nsulation
B.	onductor
C.	uter sheath
D.	niformly all over
Answer» B. onductor

Discussion

46.	The force between two charges is 120 N. If the distance between the charges is doubled, the force will be
A.	0 N
B.	0 N
C.	0 N
D.	5 N
Answer» C. 0 N

Discussion

47.	When a dielectric is placed in an electric field the field strength
A.	ecreases
B.	ncreases
C.	educes to zero
D.	emain unchanged
Answer» B. ncreases

Discussion

48.	at a point may be defined as equal to the lines of force passing normally through a unit cross section at that point.
A.	lectric intensity
B.	agnetic flux density
C.	lectric flux
D.	one of the above
Answer» B. agnetic flux density

Discussion

49.	Dielectric strength of medium
A.	ncreases with rise in temperature
B.	ncreases with moisture content
C.	s same for all insulating materials
D.	one of the above
Answer» E.

Discussion

50.	The dissipation factor of a good dielectric is of the order of
A.	0.0002
B.	0.002
C.	0.02
D.	0.2
Answer» B. 0.002

Discussion

Explore topic-wise MCQs in BITSAT.

In the case of a lossy capacitor, its series equivalent resistance value will be

Which of the following capacitor is preferred in case of single phase motor ?

Which of the following capacitors has relatively shorter shelf life ?

This mention statement is associated with "The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface".

1 volt/meter is same as

The dielectric constant (relative permittivity) of glass is given by

A potential of 400 V is applied to a capacitor, the plates of which are 4 mm apart. The strength of electric field is

Electric intensity at any point in an electric field is equal to the at that point.

A capacitance of 100 fiF is connected in series with a resistance of 8000 £2. The time constant of the circuit is

The direction of electric field due +0 positive charge is .

Paper condenser is

A field line and an equipotential surface are

Which of the following is not a vector ?

The electrostatic force between two charges of one coulomb each and placed at a distance of 0.5 m will be

The total deficiency or excess of electrons in a body is known as

For a good 0.05 uF capacitor ohmmeter reading should

The property of a capacitor to store electricity is called its

Which of the following expression is correct for electric field strength ?

An uncharged conductor is placed near a charged conductor, then

The capacitor preferred for high frequency circuits is

For which of the following parameter variation, the capacitance of the capacitor remains unaffected ?

The ohmmeter reading for a short circuited capacitor is

Out of the following capacitors of identical rating which one will have the smallest dimensions ?

A unit tube of flux is known as tube

A mica capacitor and a ceramic capacitor both have the same physical dimensions. Which will have more value of capacitance ?

The electric field intensity at a point situated 4 meters from a point charge is 200 N/C. If the distance is reduced to 2 meters, the field intensity will be

A paper capacitor is usually available in the form of

A capacitor consists of two

The time constant and R-C circuit may also be defined as the time during which the charging current falls to ______ percent of its initial maximum value,

Dielectric strength of a medium is usually expressed in

The value of E within the field due to a point charge can be found with the help of

The number of Faraday tubes of flux passing through a surface in an electric field is called

The capacity of capacitor bank used in power factor correction is expressed in terms of

When 4 volts e.m.f. is applied across a 1 farad capacitor, it will store energy of

Permittivity is expressed in

Mica capacitors are characterised by all of the following except

If the sheet of a bakelite is inserted between the plates of an air capacitor, the capacitance will

Capacitance increases with

Which is the most superior dielectric out of the following ?

“The surface integral of the normal component of the electric displacement D over any closed surface equals the charge enclosed by the surface”.The above statement is associated with

"The total electric flux through any closed surface surrounding charges is equal to the amount oflcharge enclosed".The above statement is associated with

If a third equal and similar charge is placed between two equal and similar charges, then this third charge will

capacitors are mainly used for radio frequency tuning.

Dielectric strength ______ with increasing thickness

The minimum value of potential gradient in a cable occurs in

The force between two charges is 120 N. If the distance between the charges is doubled, the force will be

When a dielectric is placed in an electric field the field strength

at a point may be defined as equal to the lines of force passing normally through a unit cross section at that point.

Dielectric strength of medium

The dissipation factor of a good dielectric is of the order of