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Published on: 27/06/2019
Most important one mark questions physics chapter one
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.
A charge Q μ C is placed at the center of a cube. The flux coming out from any surface will be
\(\frac { Q }{ { 24\varepsilon }_{ 0 } } \)
\(\\ \frac { Q }{ { 8\varepsilon }_{ 0 } } \)
\(\frac { Q }{ { 6\varepsilon }_{ 0 } } \times { 10 }^{ -6 }\)
\(\frac { Q }{ { 6\varepsilon }_{ 0 } } \times { 10 }^{ -3 }\)
2.
The concentric spheres of radii R and r have similar charges with equal surface densities (σ). What is the electric potential at their common centre?
\(\frac { \sigma }{ { \varepsilon }_{ 0 } } (R-r)\)
\(\frac { \sigma }{ { { \varepsilon }_{ 0 } } } (R+r)\)
\(R\frac { \sigma }{ { \varepsilon }_{ 0 } } \)
\(\frac { \sigma }{ { \varepsilon }_{ 0 } } \)
3.
When three capacitors are joined in series, the total capacitance is
Equal to the sum of the capacitance
Greater than the value of the maximum capacitance
Less than the value of the mininim capacitance
none of the above
4.
One Joule per Coulomb is called
Gauss
ampere
farad
volt
5.
The electric flux through a surface will be minimum when the angle between E and A is
90°
60°
0°
45°
6.
Which of the following cannot be the units of electric field intensity?
NC-1
Vm-1
JC-1/m
JC-1
7.
Region around a charge q in which it exerts force on a test charge is called
electric flux intensity
electric force
electric field
Coulomb's force
8.
Value of k in Coulomb's law depends upon
magnitude of charges
distance between charges
both (a) and (b)
medium between two charges
9.
When 4V emf is applied across a 1F capacitor, it will store energy of
2J
4J
6J
8J
10.
In a parallel plate capacitor of capacitance C, a metal sheet is inserted between the plates, parallel to them. The thickness of the sheet is half of the separation between the plates. The capacitance now becomes
2C
\(\frac{C}{4}\)
4C
\(\frac{C}{2}\)
11.
Charge Q is divided into two parts which are then kept some distance apart. The force between them will be maximum if the two parts are
\(\frac{Q}{2} \) each
each \(\frac{Q}{5} \)
\(\frac{Q}{3} \)and\(\frac{2Q}{3} \)
\(\frac{Q}{4} \)and\(\frac{3Q}{4} \)
12.
A spherical equipotential surface is not possible
for a point charge
for a dipole
inside a spherical capacitor
inside a uniformly charged sphere
13.
Two identical metal balls with charges +2Q and -Q are separated by some distance and exerts a force F on each other. They are joined by a conducting wire, which is then removed. The force between them will now.
F/8
F/12
F
F/4
14.
Which of the following statement on equipotential surface is wrong?
The potential difference between any two points on the surface, is zero.
The electric field is always perpendicular to the surface
Equipotential surface is always spherical.
No work is done in moving a charge along the surface
15.
Two conducting charged spheres x and y having unequal charges are connected by a wire. Which of the following is true?
charge is conserved
electrostatic energy is conserved
both the charge and electrostatic energy are conserved
neither of these is conserved
16.
A bird sitting an a high power line
gets killed instantly
gets a mild shock
is not affected practically
gets a fatal shock
17.
Two copper spheres A and B of same size are charged to same potential. A is hollow and B is solid. Which of the two holds more charge?
Solid sphere cannot hold any charge
hollow sphere cannot hold any charge
both have zero charge
both have the same charge
18.
An electric dipole placed at an angle in a nonuniform electric field experiences
neither a force nor a torque
torque
both force and torque
force only
19.
The capacitance of a parallel plate capacitor increases from 5μf of 50μf when a dielectric is filled between the plates. The permitivity of the dielectric is
8.854 x 10-12 C2N-1 m-2
8.854 x 10-11C2N-1 m-2
10 x 10-12C2N-1 m-2
12 x 10-12C2N-1 m-2
20.
If C is the capacitance of an air filled capacitor and C is the capacitance of dielectric filled capacitor, then
C'εrC'
\(C'=\frac { C }{ { \varepsilon }_{ r } } \)
\(C'=\frac { { \varepsilon }_{ r } }{ C } \)
\(C'={ \varepsilon }_{ 0 }{ \varepsilon }_{ r }\)
1.
(c)
\(\frac { Q }{ { 6\varepsilon }_{ 0 } } \times { 10 }^{ -6 }\)
2.
(b)
\(\frac { \sigma }{ { { \varepsilon }_{ 0 } } } (R+r)\)
3.
(b)
Greater than the value of the maximum capacitance
4.
(d)
volt
5.
(a)
90°
6.
(d)
JC-1
7.
(c)
electric field
8.
(d)
medium between two charges
9.
(d)
8J
10.
(a)
2C
11.
(a)
\(\frac{Q}{2} \) each
12.
(b)
for a dipole
13.
(a)
F/8
14.
(a)
The potential difference between any two points on the surface, is zero.
15.
(a)
charge is conserved
16.
(c)
is not affected practically
17.
(d)
both have the same charge
18.
(c)
both force and torque
19.
(b)
8.854 x 10-11C2N-1 m-2
20.
(a)
C'εrC'
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