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
Important one mark 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.
_______ and Coulomb's law form fundamental principles of electrostatics
Newton's law of gravitation
superposition principle
ohm's law
Kepler's law
2.
The relative permittivity of water is _______.
εr = 70
εr = 75
εr = 80
εr = 85
3.
The value of constant 'K' in coulomb law is _____________.
0.9 x 109 Nm2 C2
9 x 10-9 Nm2C2
9 x 109 Nm-2 C-2
9 x 109 Nm2 C-2
4.
The electrostatic force obeys _______.
Newton's I law
Newton's II law
Newton's III law
none of the above
5.
Two metallic spheres of radii 1 cm and 3 cm are given charges of -1 \(\times\) 10-2 C and 5 \(\times\) 10-2 C respectively. If these are connected by a conducting wire, the final charge on the bigger sphere is
3 \(\times\) 10-2 C
4 \(\times\) 10-2 C
1 \(\times\) 10-2 C
2 \(\times\) 10-2 C
6.
Three capacitors are connected in triangle as shown in the figure. The equivalent capacitance between the points A and C is
1μF
2μF
3μF
\(\frac{1}{4}\)μF
7.
A parallel plate capacitor stores a charge Q at a voltage V. Suppose the area of the parallel plate capacitor and the distance between the plates are each doubled then which is the quantity that will change?
Capacitance
Charge
Voltage
Energy density
8.
If voltage applied on a capacitor is increased from V to 2V, choose the correct conclusion.
Q remains the same, C is doubled
Q is doubled, C doubled
C remains same, Q doubled
Both Q and C remain same
9.
Two points A and B are maintained at a potential of 7 V and -4 V respectively. The work done in moving 50 electrons from A to B is _______.
8.80 x 10-17 J
-8.80 x 10-17 J
4.40 x 10-17 J
5.80 x 10-17 J
10.
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11.
An electric field \(\vec { E } =10x\hat { i } \) exists in a certain region of space. Then the potential difference V = Vo – VA, where Vo is the potential at the origin and VA is the potential at x = 2 m is _____.
10 V
-20 V
+20 V
-10 V
12.
Rank the electrostatic potential energies for the given system of charges in increasing order
1 = 4 < 2 < 3
2 = 4 < 3 < 1
2 = 3 < 1 < 4
3 < 1 < 2 < 4
13.
Two identical conducting balls having positive charges q1 and q2 are separated by a centre to centre distance r. If they are made to touch each other and then separated to the same distance, the force between them will be _____.
less than before
same as before
more than before
zero
14.
Four Gaussian surfaces are given below with charges inside each Gaussian surface. Rank the electric flux through each Gaussian surface in increasing order.
D < C < B < A
A < B = C < D
C < A = B < D
D > C > B > A
15.
16.
Which charge configuration produces a uniform electric field?
point charge
uniformly charged infinite line
uniformly charged infinite plane
uniformly charged spherical shell
17.
Two identical point charges of magnitude –q are fixed as shown in the figure below. A third charge +q is placed midway between the two charges at the point P. Suppose this charge +q is displaced a small distance from the point P in the directions indicated by the arrows, in which direction(s) will +q be stable with respect to the displacement?
A1 and A2
B1 and B2
both directions
No stable
1.
(b)
superposition principle
2.
(c)
εr = 80
3.
(d)
9 x 109 Nm2 C-2
4.
(b)
Newton's II law
5.
Q = q1 + q2 = 4 x 10-2C
\(q_{2f}=Q[\frac{r_2}{r_1+r_2}]\)
= 4 x 10-2 \([\frac{3}{4}]\)
q2f = 3 x 10-2 C
6.
\(\frac{1}{C_s}=\frac{1}{2}+\frac{1}{2}=1 \ μF\)
Cp = 1 + 1 = 2 μF
7.
Energy density uE \(=\frac{U}{volume}\)
If A' = 2A d ' = 2d
Then V ' = 2A x 2d = 4Ad = 4V
Then volume would be increased. So, energy density will change.
8.
If voltage is increased from V to 2 V
Then Q1 = CV
Q2 = C(2 V) = 2 CV
∴ Q is doubled and C remains same
9.
W = qV
V = 7 - (-4) = 11 V
q = ne = 50 x 1.6 x 10-19 = 8 x 10-18C
W = 8 x 10-18 x 11 = 88 x 10-18 = 8.8 x 10-17]
10.
(b)
11.
\(\vec {E}\) = 10x\(\hat{i},\) when x = 2 m
\(\vec {E}\) = 10 x 2 x \(\hat{i}\) = 20\(\hat{i}\)
Since, \(E=\frac{-dV}{dx}\therefore V=+20 V\)
12.
\(U=\frac{1}{4\piε_0}\frac{q_1q_2}{r_{12}}\)
\(i) U=\frac{1}{4\piε_0}\frac{Q(-Q)}{r}=\frac{1}{4\piε_0}[\frac{-Q^2}{r}]\)
\(ii) U=\frac{1}{4\piε_0}\frac{(-Q)(-Q)}{r}=\frac{1}{4\piε_0}[\frac{Q^2}{r}]\)
\(iii) U=\frac{1}{4\piε_0}\frac{Q(2Q)}{r}=\frac{1}{4\piε_0}[\frac{2Q^2}{r}]\)
\(iv) U=\frac{1}{4\piε_0}\frac{Q(-2Q)}{2r}=\frac{1}{4\piε_0}[\frac{-Q^2}{r}]\)
From the values, 1 = 4 < 2 < 3
13.
Force ∝ charge
After the separation, the magnitude of charge will be increased. So the force will be more than before.
14.
The electric flux of D is less than that of C
The electric flux of C is less than that of B
The electric flux of B is less than that of A
15.
(b)
16.
(c)
uniformly charged infinite plane
17.
The charge + q will be stable between B1 and B2 with respect to the displacement.
12th Standard Syllabus & Materials
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