12th Standard Syllabus & Materials
12th Standard
TN 12th English Poem - 6 - Incident of the French Camp Sample Question Papers Study Material - QB365 Set A
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TN 12th English Prose - 6 - On the Rule of the Road Sample Question Papers Study Material - QB365 Set A
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TN 12th English Prose - 5 - The Chair Sample Question Papers Study Material - QB365 Set A
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TN 12th English Supplementary - 4 - The Midnight Visitor Sample Question Papers Study Material - QB365 Set A
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TN 12th English Poem - 4 - Ulysses Sample Question Papers Study Material - QB365 Set A
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TN 12th English Prose - 4 - The Summit Sample Question Papers Study Material - QB365 Set A
Published on: 27/06/2019
Chepter one centum multiple choice questions
Download Tamil Nadu 12th Standard Physics question papers, model tests, one-mark questions, important questions, and public exam papers in PDF format. Free study materials and answer keys for TN State Board students.
Questions + Answers key
Take MCQ Physics Test1.
Dielectric constant for the metals is
Zero
>1
<1
Infinite
2.
In tuning radio we use,
capacitors
transistors
diodes
LEDS
3.
An uniformly charged conducting shell of 2cm diameter has a surface charge density of 80μC / m2. The charge on the shell is
100.48 nC
100.48 μC
100.48C
100.48 x 10-12C
4.
Two charges are kept at a distance in air what should be the relative permittivity of the medium in which the two charges should be kept at the same distance so that they experience half of the force which they experienced in air?
\(\frac{1}{2}\)
\(\frac{1}{0.2}\)
2
0.2
5.
The negative gradient of potential is
torque
electric current
electric field intensity
electric force
6.
The lower comb of van de graaff generator is maintained at a positive potential of
10 kV
107 V
100 V
103 V
7.
The direction of electric field at a point the equatorial line due to an electric dipole is
along the equatorial line towards the dipole.
along the equatorial line away from the dipole
parallel to the axis of the dipole and opposite to the direction of dipole moment
parallel to the axis of the dipole and in the direction of dipole moment.
8.
In the given cricuit the effective capacitance between A and B will be
3μf
\(\frac{36}{13}\) μf
13μf
7μf
9.
The unit for electric susceptibility is
Nm2 C-2
C2 N-1 m-2
C-2Nm2
N-1 m-2C2
10.
A non-conducting material which has no free electrons is called
capacitor
Dielectric
conductor
Inductor
11.
The time taken by a conductor to reach electrostatic equilibrium is in the order of
10-18
10-14s
10-16 s
10-20 s
12.
The electric flux is negative, if the angle between \(\overset { \rightarrow }{ dA } \) and \(\overset { \rightarrow }{ E } \) is
Less than 90°
greater than 90°
equal to 90°
equal to 0°
13.
The unit for electric flux is
C2N-1m-2
Nm2C-2
Nm2C-1
Nm-2C-1
14.
The potential due to a single point charge falls as
\(\frac { 1 }{ { r }^{ 2 } } \)
\(\frac { 1 }{ { r }^{ 3 } } \)
\(\frac { 1 }{ { r }^{ } } \)
-\(\frac { 1 }{ { r }^{ } } \)
15.
At Infinity (i.e r = ∞), the electrostatic potential (V) is
∞
maximum
minimum
Zero
16.
The expression for electric potential difference is
\(\int _{ R }^{ P }{ +\overset { \rightarrow }{ E } .\overset { \rightarrow }{ dr } } \)
\(\\ -\int _{ \infty }^{ P }{ +\overset { \rightarrow }{ E } .\overset { \rightarrow }{ dr } } \)
\(\\\int _{ \infty }^{ P }{ \overset { \rightarrow }{ E } .\overset { \rightarrow }{ dr } } \)
\(\int _{ R }^{ P }{ -\overset { \rightarrow }{ E } .\overset { \rightarrow }{ dr } } \)
17.
The magnitude of electric dipole moment of water molecule is
6 x 10-30 cm
6.2 x 10-30 cm
6.1 x 10-30
5.95 10-30 cm
18.
The magnitude of torque on dipole is maximum if
θ = 0o
θ = 90o
θ = 180o
θ = 270o
19.
The dipole is called point dipole when the distance ______________
2a approaches infinity and q approaches zero
2a approaches zero and q approaches infinity
2a approaches zero and q approaches zero
2a approaches infinity and q approaches infinity
20.
The expression for the electric field due to a surface of total charge 'Q' is given by __________
\(\overset { \rightarrow }{ E } =\frac { 1 }{ 4\pi { \varepsilon }_{ 0 } } \int { \frac { \sigma dA }{ { r }^{ 2 } } } \hat { r } \)
\(\overset { \rightarrow }{ E } =\frac { 1 }{ 4\pi { \varepsilon }_{ 0 } } \int { \frac { \rho dA }{ { r }^{ 2 } } } \hat { r } \)
\(\overset { \rightarrow }{ E } =\frac { 1 }{ 4\pi { \varepsilon }_{ 0 } } \int { \frac { \lambda dl }{ { r }^{ 2 } } } \hat { r } \)
\(\overset { \rightarrow }{ E } =\frac { 1 }{ 4\pi { \varepsilon }_{ 0 } } \int { \frac { dq }{ { r }^{ 2 } } } \hat { r } \)
1.
(d)
Infinite
2.
(a)
capacitors
3.
(a)
100.48 nC
4.
(b)
\(\frac{1}{0.2}\)
5.
(c)
electric field intensity
6.
(a)
10 kV
7.
(c)
parallel to the axis of the dipole and opposite to the direction of dipole moment
8.
(a)
3μf
9.
(b)
C2 N-1 m-2
10.
(b)
Dielectric
11.
(c)
10-16 s
12.
(b)
greater than 90°
13.
(c)
Nm2C-1
14.
(c)
\(\frac { 1 }{ { r }^{ } } \)
15.
(d)
Zero
16.
(d)
\(\int _{ R }^{ P }{ -\overset { \rightarrow }{ E } .\overset { \rightarrow }{ dr } } \)
17.
(c)
6.1 x 10-30
18.
(b)
θ = 90o
19.
(b)
2a approaches zero and q approaches infinity
20.
(a)
\(\overset { \rightarrow }{ E } =\frac { 1 }{ 4\pi { \varepsilon }_{ 0 } } \int { \frac { \sigma dA }{ { r }^{ 2 } } } \hat { r } \)
12th Standard Syllabus & Materials
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