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Velumanickam Matriculation Higher Secondary School – vaani – Ramanathapuram.
(12th Standard Physics – One mark Questions and Answers with Hints based on new pattern)
1 | P a g e G.R.Balaji M.Sc.,M.Phil.,B.Ed.,M.I.S.T.E. P.G Assistant in The Department Of Physics, VMMHSC,Vaani.
[email protected] Ph: 9952480019
Part A
Direction (Q.No 1 – 28 ) these questions consist of two statements. Each linked as Assertion and Reason.
While answering these questions you are required to choose any one of the following responses.
a) If both Assertion and Reason are true and Reason is the correct explanation of Assertion.
b) If both Assertion and Reason are true but Reason is not correct explanation of Assertion.
c) If Assertion is true but Reason is false
d) If Assertion is false but Reason is true
e) If both Assertion and Reason is false
1. Assertion: with the help of gauss theorem we can
find the electric field at any point.
Reason: Gauss theorem can be applied for any
type of charge distribution
2. Assertion: A point charge produces a uniform
electric field.
Reason: Due to the point charge electric lines of
forces are parallel and equidistant.
3. Assertion: V / I = constant = R is Ohm’s law
Reason: V-I graph is always a straight line passing
through origin.
4. Assertion: If by mistake, a voltmeter is connected
in series, then circuit will burn.
Reason: Current will drastically decreases in the
circuit
5. Assertion: A beam of electron can pass
undeflected through a region of E and B.
Reason: force on moving charged particle due to
magnetic field may be zero in some cases.
6. Assertion: Flux of magnetic field B through a
closed surface is equal to zero.
Reason: magnetic field lines are closed curves.
They do not have beginning or end.
7. Assertion: Magnetic flux and Electric flux have the
same unit.
Reason: Flux passing through the surface gives an
idea about the filed lines crossing that surface.
8. 8. Assertion: co-efficient of self-induction of an
9. inductor depends upon the rate of change of
current passing through it.
Reason: from 𝑒 = −𝐿 𝑑𝑖
𝑑𝑡
𝐿 = − 𝑒𝑑𝑖
𝑑𝑡
9. Assertion: A capacitor cannot be connected in
a DC circuit.
Reason: In DC circuit, current through capacitor
circuit becomes zero in steady state.
10. Assertion: An AC can be transmitted over a
long distance without much power loss.
Reason: AC can be stepped up or down by
using the transformer.
11. Assertion: Inductive reactance of an inductor
in DC circuit is zero.
Reason: Angular frequency of DC circuit is zero.
12. Assertion: At resonance, power factor of
L-C-R series circuit is 1.
Reason: At resonance XC = XL
13. Assertion: At resonance, power factor of
L-C-R series circuit is 0.
Reason: At resonance current function and
voltage functions are in same phase.
14. Assertion: Average power Pav = i2rms R
Reason: In one full cycle net power is
dissipated only along a resistor.
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Velumanickam Matriculation Higher Secondary School – vaani – Ramanathapuram.
(12th Standard Physics – One mark Questions and Answers with Hints based on new pattern)
2 | P a g e G.R.Balaji M.Sc.,M.Phil.,B.Ed.,M.I.S.T.E. P.G Assistant in The Department Of Physics, VMMHSC,Vaani.
[email protected] Ph: 9952480019
15. Assertion: Interference shows wave nature
of light.
Reason: Photoelectric effect proves particle
nature of light.
16. Assertion: By increasing the accelerating voltage
in Coolidge tube, wave length of characteristic of
X-ray does not change.
Reason: cut-off wavelength is inversely
proportional to the accelerating voltage.
17. Assertion: A particle at rest breaks into two
particles of different masses. They fly off in
different directions. Their de-broglie
wavelengths will be different.
Reason: Their speed will be different.
18. Assertion: Density of nucleus is independent of
mass number.
Reason: Radius of the nucleus is directly
proportional to A3.
19. Assertion: Both in fission and fusion reactions, the
total binding energy of daughter nuclei is more
than the total binding energy of parent nuclei.
Reason: In any nuclear reaction, energy is released
if total binding energy increases.
20. Assertion: Angular momentum of single electron
is any orbit of hydrogen type atom is independent
of the atomic number of the element.
Reason: In ground state, angular momentum is
minimum.
21. Assertion: Ionisation power of alpha particles is
maximum while penetration power of gamma rays
is maximum.
Reason: Alpha particles are heaviest particles
while gamma rays have maximum energy.
22. Assertion: Optical Fibre communication is more
economical than other system of communication.
Reason: The information carrying capacity of a
communication system is directly proportional to
its band width.
23. Assertion: The receiver reconstructs the
original message or data after its propagation
through communication channel.
Reason: The reconstruction is necessary only
in some cases.
24. Assertion: Fax is modulating and demodulating
Device.
Reason: It is necessary for exact reproduction
of a document.
25. Assertion: Modulator or encoder is an essential
component of a transmitter.
Reason: The message signal has to be changed
into a suitable form for transmission.
26. Assertion: Balmer series lies in the visible
region of electromagnetic spectrum.
Reason: 𝟏
⅄= 𝑹(
𝟏
𝟐𝟐−
𝟏
𝒏𝟐)
Where n = 3,4,5…
27. Assertion: Corpuscular theory fails in explaining
the velocity of light in air and water.
Reason: According to corpuscular theory, Light
should travel faster in denser media than rarer
media.
28. Assertion: A metallic shield in the form of
hollow shell may be build to block an electric
field.
Reason: In a hollow metallic spherical shield,
the electric field inside it is zero at every point.
29. Pick out the correct statement from the following:
a) Mercury vapour lamp produces line emission
spectrum.
b) Oil flame produces line emission spectrum
c) Band spectrum helps us to study molecular
structure.
d) Sunlight spectrum is an example for line
absorption spectrum.
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Velumanickam Matriculation Higher Secondary School – vaani – Ramanathapuram.
(12th Standard Physics – One mark Questions and Answers with Hints based on new pattern)
3 | P a g e G.R.Balaji M.Sc.,M.Phil.,B.Ed.,M.I.S.T.E. P.G Assistant in The Department Of Physics, VMMHSC,Vaani.
[email protected] Ph: 9952480019
30. Identify the wrong statement
a) In conductor, the valence band and
conduction bands overlaps.
b) Substances with energy gap of the order of
10 eV are insulator.
c) The resistivity of semiconductor is lower
than metals.
d) The conductivity of metal is high.
31. Pick out the incorrect statement from the following:
a) A negative test charge experiences a
force opposite to the direction of the
field.
b) The tangent drawn to a line of force
represents the direction of electric field.
c) Field lines never intersects.
d) The electric field lines forms closed loop.
32. Identify the wrong statement
a) Charge is a vector quantity.
b) Current is a scalar quantity.
c) Charge can be quantized.
d) Charge is additive in nature.
33. Choose the correct statement
a) Kirchoff’s first law of electricity is based
on conservation of charge and second
law is based on conservation of energy.
b) Kirchoff’s first law of electricity is based
on conservation of energy and second
law is based on conservation of charge.
c) Kirchoff’s both laws are based on
conservation of charge.
d) Kirchoff’s both laws are based on
conservation of energy.
34. Match the following
a) 1 d 2 c 3b 4a
b) 1 a 2 d 3c 4b
c) 1 d 2 a 3b 4c
d) 1 c 2 b 3a 4d
35. Match the following
a) 1 c 2 b 3a 4d
b) 1 d 2 c 3b 4a
c) 1 a 2 c 3b 4d
d) 1 c 2 a 3 b 4d
List 1 List 2
1. Charge a) C2 N-1 m-2
2. Permittivity of
free space
b) N C-1
3. Electric field
intensity
c) C m
4. Dipole moment d) coulomb
List 1 List 2
1. Electric field a) pE sinƟ
2. Torque b) q/l
3. Linear charge
density
c) - dv/dx
4. Capacitance d) Ƹ0A/d
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https://www.trbtnpsc.com/2018/02/latest-12th-study-materials-2018.html
Velumanickam Matriculation Higher Secondary School – vaani – Ramanathapuram.
(12th Standard Physics – One mark Questions and Answers with Hints based on new pattern)
4 | P a g e G.R.Balaji M.Sc.,M.Phil.,B.Ed.,M.I.S.T.E. P.G Assistant in The Department Of Physics, VMMHSC,Vaani.
[email protected] Ph: 9952480019
36. Match the following
a) 1 b 2 d 3c 4a
b) 1 b 2 d 3a 4c
c) 1 a 2 b 3d 4c
d) 1 d 2 c 3a 4b
37. Match the following
a) 1 d 2 a 3c 4b
b) 1 b 2 c 3d 4a
c) 1 a 2 d 3c 4b
d) 1 d 2 a 3b 4c
38. Match the following
a) 1 b 2 c 3d 4a
b) 1 a 2 d 3b 4c
c) 1 c 2 b 3d 4a
d) 1 c 2 b 3a 4d
39. Match the following
a) 1 d 2 a 3c 4b
b) 1 c 2 d 3a 4b
c) 1 c 2 a 3d 4b
d) 1 a 2 c 3b 4d
List 1 List 2
1. 1 kWh a) 1.08 V
2. Metals and
alloys
b) 36 X 105 J
3. Daniel cell c) 0.25 A
4. Leclanche cell d) 10-6 -10-8 ohm m
List 1 List 2
1. Force on the
conductor
a) nBA / C
2. Current sensitivity b) nBA / CG
3. Voltage sensitivity c) 2aBh / µ0n
4. Reduction factor d) BIL sinƟ
List 1 List 2
1. Uniaxial crystal a) Mumetal
2. Biaxial crystal b) Quartz
3. Step up transformer c) Topaz
4. Hysteresis loss d) K > 1
List 1 List 2
1. Optical rotation a) Oil painting
2. Polaroids b) Corpuscular theory
3. Nicol Prism c) Polarimeter
4. Newton d) 720 and 1080
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Velumanickam Matriculation Higher Secondary School – vaani – Ramanathapuram.
(12th Standard Physics – One mark Questions and Answers with Hints based on new pattern)
5 | P a g e G.R.Balaji M.Sc.,M.Phil.,B.Ed.,M.I.S.T.E. P.G Assistant in The Department Of Physics, VMMHSC,Vaani.
[email protected] Ph: 9952480019
40. Match the following
a) 1 b 2 a 3c 4d
b) 1 d 2 c 3a 4b
c) 1 a 2 c 3d 4b
d) 1 d 2 a 3b 4c
41. Match the following
a) 1 d 2 a 3b 4c
b) 1 b 2 c 3a 4d
c) 1 b 2 a 3c 4d
d) 1 a 2 d 3b 4c
42. Match the following
a) 1 d 2 c 3 b 4a
b) 1 a 2 c 3 b 4d
c) 1 c 2 a 3d 4b
d) 1 d 2 c 3 a 4b
43. Match the following
a) 1 d 2 c 3 b 4a
b) 1 a 2 c 3 b 4d
c) 1 c 2 a 3d 4b
d) 1 d 2 c 3 a 4b
List 1 List 2
1. Grating element a) m-1
2. Bohr radius b) 43
3. Rydberg constant c) 0.53 Ao
4. Technetium d) m
List 1 List 2
1. Iron a) Skin diseases
2. Roentgen b) 8.8 MeV
3. Radio-isotope c) 1.6 X 1012 Pairs
4. Leptons d) Electron
List 1 List 2
1. Silicon a) 𝐴�̅� + 𝐴̅ 𝐵
2. IF of AM b) 𝐴̅ + �̅� + 𝐶̅
3. 𝐴𝐵𝐶̅̅ ̅̅ ̅̅ c) 455 kHz
4. EXOR d) 1.1 eV
List 1 List 2
1. N – type semiconductor a) Germanium
2. P – type semiconductor b) Gold
3. Conductor c) Aluminium
4. Intrinsic semiconductor d) Phosphorous
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Velumanickam Matriculation Higher Secondary School – vaani – Ramanathapuram.
(12th Standard Physics – One mark Questions and Answers with Hints based on new pattern)
6 | P a g e G.R.Balaji M.Sc.,M.Phil.,B.Ed.,M.I.S.T.E. P.G Assistant in The Department Of Physics, VMMHSC,Vaani.
[email protected] Ph: 9952480019
44. Choose the odd one out of the following
a) mica b) oil c) silver d) rubber
45. Choose the odd one out of the following
a) electron b) proton
c) neutron d) α - particle
46. Choose the odd one out of the following
a) wave number b) Rydberg constant
c) wave length d) refractive index
47. Choose the odd one out of the following
a) Balmer b) Paschen
c) Brackett d) Pfund
48. Choose the odd one out of the following
a) Heavy water b) paraffin
c) graphite d) water
49. Choose the odd one out of the following
a) Torque b) dipole moment
c) electric field d) electric potential
50. Choose the odd one out of the following
a) lead b) Ag c) Au d) cd
51. Electromagnetic waves are ______ waves
52. By Coulomb’s law, the force of attraction or
repulsion between two point charges is
inversely proportional to _______ of the
distance between them.
53. The resistivity of super conductor is ______
54. The conductivity of super conductor is ______ 55. Magnetic moment of current loop M = ___
56. The scattering of sun light by gas molecule
in the earth’s atmosphere is called
_______ scattering.
57. Power loss due to Joule’s heating effect is
called __________ loss.
58. Nicol prism is based on the principle of ____
59. The spectral series of hydrogen in UV region
are called ________ series.
60. Acronym of LASER is __________
61. The unit of work function is _______
62. The particle that has no charge and no rest
mass but travels with the velocity of light is
called _________
63. 𝐴 ( 𝐴̅ + 𝐵 ) = ______
64. A device which magnify the amplitude of
weak signal is called ________
65. The resistance of semiconductor _______
with increase in temperature.
****** ALL THE BEST ******
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https://www.trbtnpsc.com/2018/02/latest-12th-study-materials-2018.html
Velumanickam Matriculation Higher Secondary School – vaani – Ramanathapuram.
(12th Standard Physics – One mark Questions and Answers with Hints based on new pattern)
7 | P a g e G.R.Balaji M.Sc.,M.Phil.,B.Ed.,M.I.S.T.E. P.G Assistant in The Department Of Physics, VMMHSC,Vaani.
[email protected] Ph: 9952480019
Answer Key:
1 d 21 a 41 b 61 joule
2 e 22 a 42 a 62 Photon
3 c 23 c 43 a 63 AB
4 d 24 d 44 c 64 Amplifier
5 b 25 a 45 c 65 Decreases
6 a 26 a 46 d
7 d 27 a 47 a
8 d 28 a 48 b
9 d 29 a,c,d 49 d
10 a 30 c 50 a
11 a 31 d 51 Transverse
12 a 32 a 52 square
13 d 33 a 53 Zero
14 a,b 34 c 54 Infinity
15 b 35 d 55 I x A
16 b 36 b 56 Rayleigh
17 d 37 d 57 Copper
18 c 38 a 58 Double refraction
19 a 39 c 59 Lyman
20 b 40 b 60 Light Amplification by Stimulated Emission of Radiation
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Velumanickam Matriculation Higher Secondary School – vaani – Ramanathapuram.
(12th Standard Physics – One mark Questions and Answers with Hints based on new pattern)
8 | P a g e G.R.Balaji M.Sc.,M.Phil.,B.Ed.,M.I.S.T.E. P.G Assistant in The Department Of Physics, VMMHSC,Vaani.
[email protected] Ph: 9952480019
Hints:
1. We can find electric field only in Gaussian surface.
2. Electric field due to a point charge is inversely proportional to the distance from the source
charge. Therefore, at the different distances the value of E is different ( Non uniform).
3. V/I = constant = R for Ohmic circuits is Ohm’s law. Further, only for the ohmic circuits V-I graph
is straight line passing from origin.
4. Resistance of voltmeter is high. If it is connected in series, the current will decrease but circuit
will not burn.
7. Electric flux = E.S and Magnetic flux = B.S, both have different unit.
8. L depends upon the dimension of the inductor and magnetic material is filled in between them.
11. XC = ωL, for DC ω=0, therefore XL = 0
12. At resonance, XC = XL and Z = R, power factor = COS Φ = R /Z = 1
13. At resonance Φ=0, therefore, power factor cos Φ = cos 0 = 1
14. Pav = (Vrms)( Irms) (cos Φ)
= (Irms z) (Irms) (R/Z)
Pav = i2rms R
17. ⅄ = ℎ
𝑝 . Their momenta are same. Hence, their wavelength are same. ( According to
conservation law of linear momentum)
18. Radius is directly proportional to A1/3
20. L = (nh/2π), L α n
31. Electric lines does not form closed loop. Because, it can never start and end on the sane charge.
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