12th Standard Syllabus & Materials
12th Standard
TN 12th Standard Biology Zoology - Reproduction in Organisms Creative Questions Study Material - QB365 Set D
NEW12th Standard
TN 12th Standard Biology Zoology - Reproduction in Organisms Creative Questions Study Material - QB365 Set C
NEW12th Standard
TN 12th Standard Biology Zoology - Reproduction in Organisms Creative Questions Study Material - QB365 Set B
NEW12th Standard
TN 12th Standard Biology Zoology - Reproduction in Organisms Creative Questions Study Material - QB365 Set A
NEW12th Standard
TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set D
NEW12th Standard
TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set C
Published on: 12/10/2020
12th Standard Physics English Medium Free Online Test Volume 1 One Mark questions 2020
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.
________ radiations are used to study atomic structure.
UV
IR
X-rays
Gamma
2.
Electric filament lamp gives rise to _______________spectrum.
line
band
continuous
absorption
3.
The wavelength of electromagnetic wave produced by Hertz experiment was _____________.
6mm
60m
6000 mm
60 cm
4.
The existence of E.M. waves was confirmed experimentally by __________________.
Hertz
Maxwell
Huygens
Planck
5.
The orbital magnetic moment of an electron in the second orbit (n = 2) is _______________.
18.54 x 10-24 Am2
18.54 x 10-34 Am2
19.44 x 10-34 Am2
19.44 x 10-24 Am2
6.
In which of the following pairs of metals of the thermocouple, the emf is maximum?
Fe-Cu
Cu-Zn
Pt-Ag
Sb-Bi
7.
The generator rule is ____________.
Fleming's left hand rule
Fleming's right hand rule
Maxwell's right hand cork screw rule
Right hand palm rule
8.
The self-inductance of a straight conductor is ________________.
zero
infinity
very large
very small
9.
The torque (\(\tau \)) experienced by an electric dipole placed in a uniform electric field (E) at an angle θ with the field is
pEcosθ
pE cosθ
pE sinθ
2pE sinθ
10.
Electric lines of force ________.
intersect each other
never intersect
intersect at infinity
are always parallel
11.
By using law of conservation of electric charge balance the following equations:
92U238 ⇾ 90Th234 +________.
2He4
1H3
1H2
1H1
12.
For which of the following substances, resistance decreases with temperature?
copper
platinum
mercury
carbon
13.
Which of the following is not related to joule's law of heating?
\(H=VIt\)
\(H={ I }^{ 2 }Rt\)
\(H=\cfrac { { V }^{ 2 }t }{ R } \)
\(H=\cfrac { { I }^{ 2 }R }{ t } \)
14.
The conductivity is the reciprocal of ______________.
resistance
specific resistance
conductance
potential difference
15.
Which of the following is an identical?
germanium, silicon
silver, wood
aluminum, constantan
bakelite, iron
16.
The temperature co-efficient of resistance for alloys is _____________.
low
very low
high
very high
17.
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
18.
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.
19.
An isolated metal sphere of radius 'r' is given a charge' q'. The potential energy of the sphere is ____________
\(\frac { { q }^{ 2 } }{ 4\pi { \varepsilon }_{ 0 }r } \)
\(\frac { { q }^{ } }{ 4\pi { \varepsilon }_{ 0 }r } \)
\(\frac { { q }^{ } }{ 8\pi { \varepsilon }_{ 0 }r } \)
\(\frac { { q }^{ 2 } }{ 8\pi { \varepsilon }_{ 0 }r } \)
20.
The relative permittivity of water is _______.
εr = 70
εr = 75
εr = 80
εr = 85
21.
Three wires of equal lengths are bent in the form of loops. One of the loops is circle, another is a semi-circle and the third one is a square. They are placed in a uniform magnetic field and same electric current is passed through them. Which of the following loop configuration will experience greater torque?
Circle
Semi-circle
Square
All of them
22.
In an electrical circuit, R, L, C, and AC voltage source are all connected in series. When L is removed from the circuit, the phase difference between the voltage and current in the circuit is \(\frac{\pi}{3}\). Instead, if C is removed from the circuit, the phase difference is again \(\frac{\pi}{3}\). The power factor of the circuit is
1/2
1/\(\sqrt2\)
1
\(\sqrt3\)/2
23.
During the propagation of electromagnetic waves in a medium __________________.
electric energy density is double of the magnetic energy density
electric energy density is half of the magnetic energy density
electric energy density is equal to the magnetic energy density
both electric and magnetic energy densities are zero
24.
The total electric flux for the following closed surface which is kept inside water
\(\frac { 80q }{ { \varepsilon }_{ 0 } } \)
\(\frac { q }{ { 40\varepsilon }_{ 0 } } \)
\(\frac { q }{ { 80\varepsilon }_{ 0 } } \)
\(\frac { q }{ { 160\varepsilon }_{ 0 } } \)
25.
A toaster operating at 240 V has a resistance of 120 Ω. The power is ______.
400 W
2 W
480 W
240 W
1.
(a)
UV
2.
(c)
continuous
3.
(c)
6000 mm
4.
(a)
Hertz
5.
(a)
18.54 x 10-24 Am2
6.
(d)
Sb-Bi
7.
(b)
Fleming's right hand rule
8.
(a)
zero
9.
(c)
pE sinθ
10.
(b)
never intersect
11.
(a)
2He4
12.
(d)
carbon
13.
(d)
\(H=\cfrac { { I }^{ 2 }R }{ t } \)
14.
(b)
specific resistance
15.
(a)
germanium, silicon
16.
(a)
low
17.
(b)
Greater than the value of the maximum capacitance
18.
(c)
parallel to the axis of the dipole and opposite to the direction of dipole moment
19.
(a)
\(\frac { { q }^{ 2 } }{ 4\pi { \varepsilon }_{ 0 }r } \)
20.
(c)
εr = 80
21.
(a)
Circle
22.
\(\Phi = \frac{\pi}{3}-\frac{\pi}{3}=0 \)
Power factor = cosФ = cos 0 = 1
23.
(c)
electric energy density is equal to the magnetic energy density
24.
\(Φ=\frac { q_{net} }{ { \varepsilon }_{ 0 } } \)
qnet = - q + q + 2q = 2q
Relative permittivity of water = 80
\(\therefore Φ=\frac { q }{{ \varepsilon }_{ r } { \varepsilon }_{ 0 } } \)
\(=\frac{2q}{{ 80 \times \varepsilon }_{ 0 }}=\frac{q}{{ 40 \varepsilon }_{ 0 }}\)
25.
\(P=\frac{V^2}{R}=\frac{240 \times 240}{120}=480 \ W\)
12th Standard Syllabus & Materials
12th Standard
TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set B
NEW12th Standard
TN 12th Standard Physics Electronics and Communication Creative Questions Study Material - QB365 Set A
NEW12th Standard
TN 12th Standard Physics Wave Optics Creative Questions Study Material - QB365 Set D
NEW12th Standard
TN 12th Standard Physics Wave Optics Creative Questions Study Material - QB365 Set C
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Commerce
Accountancy
History
Computer Applications
Biology
Computer Technology
Computer Applications
Computer Science
Business Maths and Statistics
Commerce
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Maths
Chemistry
Physics
Computer Technology
History
Accountancy
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