Electric Charges and Fields MCQ Questions Class 12 Physics Chapter 1
NCERT MCQ Questions for Class 12 Physics Chapter 1 Electric Charges and Fields. Electric Charges and Fields MCQ Questions with Answers from Class 12 Physics.
Electric Charges and Fields MCQ Questions Class 12 Physics Chapter 1
Electric Charges and Fields Multiple Choice Questions with Answers Class 12 Physics Chapter 1 PDF is available.
Multiple choice questions:
1) The branch of physics which deals with the study of forces, Fields and potential arising from static charges is called as
a) Electromagnetics
b) Thermodynamics
c) Electrostatics
d) None
Ans: c) electrostatics
2) The property which differentiate the two kinds of charges is called as
a) Magnitude of charge
b) Direction of charge
c) Polarity of charge
d) None
Ans: c) polarity of charge
3) Like charges ____ each other.
a) Attacks
b) Repels
c) Both a and b
d) None
Ans: b) repels
4) Unlike charges _____ each other.
a) Attacks
b) Repels
c) Both a and b
d) None
Ans: a) attacks
5) When an object possess electric charge then the object is said to be
a) Charged
b) Electrified
c) Both a and b
d) None
Ans: c) both a and b
6) When the object has no electric charge then the object is said to be
a) Charged
b) Electrified
c) Electrically neutral
d) None
Ans: c) electrically neutral
7) The materials which allow to pass electricity through them easily are called as
a) Insulators
b) Conductors
c) Semiconductors
d) Superconductors
Ans: b) conductors
8) Which of the following are conductors.
a) Metals
b) Human body
c) Earth
d) All
Ans: d) all
9) The materials having high resistance to the passage of electricity are called as
a) Conductors
b) Insulators
c) Semiconductors
d) None
Ans: b) insulators
10) Which of the following are insulators.
a) Glass
b) Plastic
c) Nylon
d) All
Ans: d) all
11) The process of sharing the charges with the earth is called as
a) Grounding
b) Earthing
c) Both a and b
d) None
Ans: c) both a and b
12) If the sizes of charged bodies are very small as compared to the distance between them then the charged bodies are called as
a) Charged objects
b) Bulk of charges
c) Point charges
d) None
Ans: c) point charges
13) The mass of the body is
a) Always positive
b) Negative
c) Both a and b
d) None
Ans: a) always positive
14) The total charge of the isolated system is always
a) Not conserved
b) Conserved
c) Both a and b
d) None
Ans: b) conserved
15) The charge on electron is
a) +e
b) -e
c) 1/e
d) -1/e
Ans: b) -e
16) The charge on proton is
a) +e
b) -e
c) 1/e
d) -1/e
Ans: a) +e
17) The fact that electric charge is always an integral multiple of e is termed as
a) Conservation of charge
b) Quantisation of charge
c) Both a and b
d) None
Ans: b) quantisation of charge
18) The SI unit of an electric charge is
a) Coulomb
b) C
c) Both a and b
d) A
Ans: c) both a and b
19) The amount of charge flowing through the wire in 1s if the current flowing 1 A then the charge flowing will be
a) One coulomb
b) 2 coulomb
c) 3 coulomb
d) None
Ans: a) one coulomb
20) The value of the basic unit of the charge is
a) 1.6*10+19C
b) 1.6*10-19 C
c) 1.6*10-20C
d) None
Ans: b) 1.6*10-19C
21) How many number of electrons are present in -1C of charge
a) 3*1018 electrons
b) 6*1018 electrons
c) 1018 electrons
d) None
Ans: b) 6*1018 electrons
22) 1 micro coulomb =
a) 106 C
b) 10-6 C
c) 10 C
d) None
Ans: b) 10-6 C
23) 1 milli coulomb =
a) 103 C
b) 10 C
c) 10-2 C
d) 10-3 C
Ans: d) 10-3 C
24) According to Coulomb’s law, the coulomb force measured between two point charges is directly proportional to
a) Product of magnitude of charges
b) Square of the distance between the two charges
c) Both a and b
d) None
Ans: a) product of the magnitude of the two charges
25) According to Coulomb’s law, the coulomb force measured between two point charges is inversely proportional to
a) Product of magnitude of charges
b) Square of the distance between the two charges
c) Both a and b
d) None
Ans: b) Square of the distance between the two charges
26) In case of Coulomb’s law, the value of k is given by
a) 9*10-9 Nm2/C2
b) 9*109 Nm2/C2
c) 109 Nm2/C2
d) 10-9 Nm2/C2
Ans: b) 9*109 Nm2/C2
27) 1 C is the charge which is placed at a distance of 1m from the another charge of same magnitude in vacuum experiences an electrical force of repulsion of magnitude
a) 9*10-9 N
b) 9*109 N
c) 109 N
d) 10-9 N
Ans: b) 9*109 N
28) Force on any charge due to a number of other charges is the _____ of all the forces on that charge taken one at a time.
a) Vector difference
b) Vector sum
c) Both a and b
d) None
Ans: b) vector sum
29) The force that a unit positive charge would experiences if placed at that point is called as _____ due to charge at a point in space.
a) Electric charge
b) Electric field
c) Both a and b
d) None
Ans: b) electric field
30) The field lines of a single positive charge are
a) Radially outward
b) Radially inward
c) Both a and b
d) None
Ans: a) radially outward
31) The field lines of a single negative charge are
a) Radially outward
b) Radially inward
c) Both a and b
d) None
Ans: b) radially inward
32) Field lines start from____ charges and ends at _____ charges.
a) Negative, positive
b) Positive, negative
c) Positive, positive
d) Negative, negative
Ans: b) positive, negative
33) For a single charge the field lines start or ends at
a) Positive charge
b) Negative charge
c) Infinity
d) None
Ans: c) infinity
34) In a charge free region, electric field lines can be taken to be continuous curves
a) With breaks
b) Without breaks
c) Both a and b
d) None
Ans: b) without breaks
35) Two files lines can ____
a) Never cross each other
b) May cross each other
c) Both a and b
d) None
Ans: a) never cross each other
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36) Electrostatic field lines ____
a) Forms any closed loops
b) Do not form any closed loops
c) Both a and b
d) None
Ans: b) do not forms any closed loops
37) The total charge of the electric dipole is
a) Negative
b) Positive
c) Infinity
d) Zero
Ans: d) zero
38) The molecules having centres of positive charges and negative charges at same place, has the dipole moment as
a) Zero
b) Infinity
c) Positive
d) Negative
Ans: a) zero
39) The molecules having permanent electric dipole moment even in the absence of electric field are called as
a) Non polar molecules
b) Polar molecules
c) Both a and b
d) None
Ans: b) polar molecules
40) Water molecule is the example of
a) Polar molecule
b) Non polar molecule
c) Both a and b
d) None
Ans: a) polar molecule
41) The net electric flux through a closed surface is
a) Unity
b) Negative
c) Positive
d) Zero
Ans: d) zero
42) As the net electric flux through a closed surface is zero, the total charge contained in the closed surface is also
a) Unity
b) Zero
c) Positive
d) Negative
Ans: b) zero
43) Gauss’s law is true for
a) Any closed surface
b) For particular surfaces
c) Both a and b
d) None
Ans: a) any closed surface
44) The term on the RHS of the Gauss’s law shows the
a) Charges enclosed by the surface
b) Sum of charges enclosed by the surface
c) Both a and b
d) None
Ans: b) sum of charges enclosed by the surface
45) The surface that we choose for application of Gauss’s law is called as
a) Gaussian surface
b) Electrical surface
c) Electrostatic surface
d) None
Ans: a) Gaussian surface
46) The direction of electric field is from
a) Positive to negative plate
b) Negative to positive plate
c) Both a and b
d) None
Ans: a) positive to negative plate
47) In metals ____ are the mobile charges.
a) Electrons
b) Holes
c) Both a and b
d) None
Ans: a) electrons
48) In electrolytes, the mobile charges are
a) Positive ions
b) Negative ions
c) Both a and b
d) None
Ans: c) both a and b
49) The three basic properties possessed by the electric charge are
a) Quantisation
b) Additivity
c) Conservation
d) All
Ans: d) all
50) Conservation of electric charges means that the total charge of an isolated system remains ____ with time.
a) Changed
b) Unchanged
c) Both a and b
d) None
Ans: b) unchanged
51) Additivity of the electric charges means that the total charge of a system is the _____ of all individual charges in the system.
a) Vector sum
b) Algebraic sum
c) Vector difference
d) None
Ans: b) algebraic sum
52) The ratio of electric force and gravitational force between a proton and electron is
a) 2.4 *10-39
b) 2.4*1039
c) 2.4
d) 1039
Ans: b) 2.4*1039
53) Like coulomb force, ______ also satisfies superposition principle.
a) Electric charge
b) Electric field
c) Both a and b
d) None
Ans: b) electric field
54) The electric field lines are crowded where electric field is
a) Strong
b) Weak
c) Moderate
d) None
Ans: a) strong
55) The electric field lines are far apart where electric field is
a) Strong
b) Weak
c) Moderate
d) None
Ans: b) weak
56) In a region of constant electric field, the field lines are _______
a) Non uniformly spaced perpendicular straight lines
b) Uniformly spaced perpendicular straight lines
c) Uniformly spaced parallel straight lines
d) Both b and c
Ans: c) uniformly spaced parallel straight lines
57) Electric field lines cannot forms the
a) Open loops
b) Closed loops
c) Both a and b
d) None
Ans: b) closed loops
58) The SI unit of electric field is
a) Vm
b) V/m
c) V
d) None
Ans: b) V/m
59) The SI unit of electric flux is
a) V/m
b) V
c) Vm
d) None
Ans: c) Vm
60) The SI unit of dipole moment is
a) C
b) C/m
c) Cm
d) None
Ans: c) Cm
61) The SI unit of linear charge density is
a) C/m
b) C
c) Cm
d) None
Ans: a) C/m
62) The SI unit of surface charge density is
a) C/m
b) C/m2
c) Cm
d) Cm2
Ans: b) C/m2
63) The SI unit of volume charge density is
a) C/m
b) C/m2
c) C/m3
d) Cm
Ans: c) C/m3
64) The dimensions of electric field are
a) [M L T-3 A-1]
b) [M L T-2 A-1]
c) [M L T-3 A-2]
d) None
Ans: a) [M L T-3 A-1]
65) The dimensions of electric flux are
a) [M L-3 T-3 A-1]
b) [M L-3 T-3 A-1]
c) [M L3 T-3 A-1]
d) None
Ans: c) [M L3 T-3 A-1]
66) The dimensions of dipole moment are
a) [L T A]
b) [L T-1 A-1]
c) [L T A-1]
d) None
Ans: a) [L T A]
67) The dimensions of linear charge density is
a) [L T A]
b) [L-1 T A]
c) [L-1 T-1 A-1]
d) None
Ans: b) [L-1 T A]
68) The dimensions of surface charge density is
a) [L-2 T A]
b) [L-1 T A]
c) [L T A]
d) None
Ans: a) [L-2 T A]
69) The dimensions of volume charge density is
a) [L T A]
b) [L-1 T A]
c) [L-2 T A]
d) [L-3 T A]
Ans: d) [L-3 T A]
70) Coulomb force and gravitational force follows the
a) Conservation law
b) Inverse square law
c) Both a and b
d) None
Ans: b) inverse Square law
71) Gravitational force has only on sign but coulomb force has
a) Positive sign
b) Negative sign
c) Both a and b
d) None
Ans: c) both a and b
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