MCQs
Five Year Papers
1. The temperature at which centigrade scale is equal to 0° is
__________.
(-32°, -40°, 100°, -273°)
2. The average K.E of a molecule of a perfect gas is __________.
(1/3KT, 3/2KT, 2/3KT)
3. The internal energy in an isothermal process __________.
(Decreases, Increases, becomes zero)
4. The electric intensity at any point between two oppositely
charged plain sheets is __________.
(s/3Îo, s/Îo, s/2Îo, 2s/Îo)
5. __________ of the two charged particles of the same mass will
be deflected most in a magnetic field.
(Fast Moving, Slow moving)
6. To increase the accuracy of a potentiometer __________ should
be used.
(A uniform wire of a large length should be used, A uniform wire
of a small length, Non-uniform wire)
7. Einstein’s Theory of Relativity states that the speed of light
in vacuum is __________.
(Independent of the motion of the source and the observer,
affected by either drift, dependent on the motion of the source and the
observer)
8. If a substance contracts on freezing the increase of pressure
__________ the freezing point.
(Increases, Decreases, Does not Change)
9. A thermoflask contains hot tea. It is shaken rapidly, if the
tea is considered as the system then its temperature will __________.
(Remains the same, Rise, Fall)
10. If the temperature of the cold body is decreased the
efficiency of a carnot engine __________.
(Decreases, Increases, Remains constant)
11. The electric potential is zero __________.
(Inside a conductor, Midway between any two charges of the
opposite signs, Midway between two equal charges of the sme sign)
12. When an electron moves in a magnetic field ‘B’ with velocity
‘V’ the force acting on it is perpendicular to __________
(V but not to B, both V and B, B but not V)
13. If an electron and proton enter into a magnetic field with the
same velocity, the electron shall experience a/an __________ force than the
proton.
(Greater, Lesser, Equal)
14. The wavelength of a material particle of mass m moving with
the velocity v is given by:
(l = hn/m, l= h/mv, l = m/hn)
15. A gas exerts pressure on the walls of the containing vessel
because __________.
(It possesses momentum, the gas molecules collide with each other,
the gas has finite volume)
16. The magnitude of an electric field does not depend upon
__________.
(The distance from the charged particle, nature of the charges
causing the field, the magnitude of the charges causing the field)
17. Two parallel beams of electrons moving in the same direction
will __________.
(Repel each other, Attract each other, Neither attract nor repel
each other.
18. To increase the accuracy in a potentiometer circuit __________
should be used.
(A wire of a small length, A wire of a large length, A non uniform
wire)
19.When fast moving electrons are stopped by a metal of high
atomic weight the phenomenon gives rise to __________.
(X-rays, b-rays, g-rays)
20. The pressure and volume formula of a gas undergoing and an
Adiabatic Change is __________.
(PV =constant, PrV = constant, (PV)r= constant, PVr = constant)
21. A free electron in an electric field __________.
(remains stationary, moves from the higher potential to the lower
potential, moves from the lower potential to the higher potential)
22. An electron and a proton with the same momentum enter
perpendicularly into a uniform magnetic field __________.
(Both particles will deflect equally, the proton will deflect more
than the electron, the electron will deflect less than the proton)
23. Einstein’s photoelectric equation is written as __________.
(1/2 mv2max = hn + fo, hn = fo.- 1/2 mv2max, hn = 1/2 mv2max + fo,
None of these)
24. Force between two similar point charges separated by a
distance ‘r’ is FN. If the distance is doubled, force becomes __________.
(FN, 2FN, 4FN, FN/4)
25. Mean translational kinetic energy per molecule of an ideal gas
is given by __________.
(3KT, 2/3KT, 3/2KT)
26. Process in which there is no heat exchange is called
__________ Process.
(Isothermal, Isochoric , Adiabatic, Isobaric)
27. Spectral series obtained due to transition of electron from
higher to 3rd orbit is called __________.
(Lyman Series, Balmer Series, Brackett Series, Paschen Series)
28. A battery of e.m.f volts has internal resistance r ohm,
current I is drawn from it its terminal voltage V will be __________.
(V = E – Ir, V = E/r, V = Ir, V = E/I)
29. Electric intensity of a given charge at any point is
__________ distance from charge.
(Directly proportional to, Inversely proportional to square of,
Directly proportional to square of, Inversely proportional to square of )
30. Two resistors of 2W and 3W are connected in series with a
battery of 10 volts. Potential difference across 2W resistor will be
__________.
(5 volt, 4 volt, 6 volt, 10 volts)
31. A slab of certain dielectric is placed between two oppositely
charge plates. The intensity between plates __________.
(Decreases, Increases, Remains constant)
32. Force on a charged particle moving in a magnetic field is
given by the equation F = qvbsinq. Quantities mutually perpendicular are
__________.
(V and B, F and v, F and B, None)
Chapter 1
Heat
1. The energy that flows from a high temperature object to a low
temperature object is called __________.
(Heat, Sound Electricity, Solar Energy)
2. Hotness or coldness of an object is expressed in tems of a
quantity called __________.
(Heat, Temperature, Kelvin, None of these)
3. The SI unit of heat is __________.
(Calorie, Joule, Electron Volt, None of these)
4. The energy expended when a force of one Newton
(Calorie, Joule, kwh, Electron Volt)
5. 1J=__________.
(1Nm, 1kgms2, 1kgm-2,1kgm2s-1)
6. 1J = __________.
(kgms, 1 kgms2, 1kgm2s-2, 1kgm2s-1)
7. The average kinetic energy of the molecules of the object is
called its __________.
(Heat, Temperature, Hotness, Coldness)
8. __________ is a device used to measure the degree of hotness or
coldness of the object.
(Thermometer, Barometer, Hypsometer, None of these)
9. Generally thermometers make use of the fact that most of the
liquids __________ on heating.
(Compress, Expand, Evaporate, Sublimize)
10. On Celsius scale boiling point of water is taken as
__________.
(0°C, 100°C, 180°C, None of these)
11. On Celsius scale freezing point of water is taken as
__________.
(0°C, 100°C, 180°, None of these)
12. 1°C = __________.
{5/9 (°F – 32), 5/9 (°F + 32), 5/9 (°F – 273), 5/9 (°F + 273)}
13. 1°F = __________.
{5/9 (°C – 32), 5/9 (°F + 32), 9/5 (°C + 32), None of these}
14. K = __________.
(273 + °C, 273 - °C, 273 + °F, 273 - °F)
15. 1 cal = __________.
(11.184J, 2.184J, 3.184J, 4.184J)
16. __________ proposed that matter and energy are equivalent.
(Newton
17. The equation representing the interconversion of matter and
energy is written as __________.
(E = mc, E = mc2, E = mc3, All of these)
18. Conversion of one gram of matter to energy yields __________
joules of energy.
(9 x 1013J, 9 x 1012J, 9 x 1011J, 9 x 1010J)
19. The amount of heat required to raise the temperature of 2.0 x
108kg of water from 0°C to 100°C is equal to __________.
(9 x 1013J, 9 x 1012J, 9 x 1011J, 9 x 1010J)
20. During the combustion of 3 x 106 kg of coal __________ of
matter is converted into energy.
(1g, 1kg, 1mg, None of these)
21. The temperature at which the gases if they remain in gaseous
state exert zero pressure and have zero volume is called __________.
(1°C, 1°F, 1K, Absolute Zero)
22. The sum total of all the energy of all the molecules of atoms
in an object is known as __________.
(Temperature, Entropy, Internal Energy, None of these)
23. Once the heat is transferred to an object, it is converted
into the __________.
(Entropy of the object, Internal energy of the object, Temperature
of the object, None of these)
24. “Temperature remaining constant the volume of given mass of a
gas is inversely proportional to the pressure applied on it.” It is called
__________.
(General Gas Law, Boyle’s Law, Charle’s Law, None of these)
25. “At constant pressure the volume of a gas is proportional to
the absolute temperature.” It is called __________.
((General Gas Law, Boyle’s Law, Charle’s Law, None of these)
Chapter 12
Electrostatics
1. Matter is composed of three fundamental particles. They are
__________.
(a. Electrons, Protons, Neutrons b. Electrons, Cathode rays,
masons c. Electrons, neutrons, masons)
2. __________ is a negatively charged particle and is found around
the nucleus of an atom.
(Electron, Proton, Neutron, None of these)
3. __________ is a positively charged particle and is found in the
nucleus of an atom.
(Electron, Proton, Neutron, None of these)
4. __________ is a neutral particle and is found in the nucleus of
an atom.
(Electron, Proton, Neutron, None of these)
5. When one or more than one electrons are removed from an atom it
becomes __________.
(Neutral particle, Negatively charged particle, positively charged
particle, none of these)
6. All material objects are composed of __________.
((Electron, Proton, Neutron, atoms)
7. Atom is a __________.
(Charged particle, Negatively charged particle, Positively charged
particle, None of these)
8. If electrons are added in an atom it becomes __________.
(Neutral particle, Negatively charged particle, positively charged
particle, none of these)
9. Those material objects which do not allow the charge or
electric current to pass through them are called __________.
(Insulators, Conductors, Semi-conductors, none of these)
10. Those material objects which allow charge or electric current
to pass through them are called __________.
(Insulators, Conductors, Semi-conductors, none of these)
11. Like charges __________.
(Attract each other, Repel Each other, Neither attract nor repel
each other, None of these)
12. Unlike charges __________.
(Attract each other, Repel Each other, Neither attract nor repel
each other, None of these)
13. If the physical size of a charge particle is very small,
compared to the separation distance between them, it is called __________.
(Zero charge, Point charge, Positive charge, Negative charge)
14. “The magnitude of the electrostatic force between two point
charges is directly proportional to the product of the magnitude of the charges
and inversely proportional to the square of the distance between them.” It is
called __________.
(Faraday’s law, Coulomb’s Law, Newton
15. Îo is called __________.
(Acceleration due to gravity, Gravitational constant, Spring
constant, Permitivity of free space)
16. If the quantity of charge on each of the two bodies is
doubled, the force between them becomes __________.
(Twice, Four times, Nine times, Sixteen times)
17. __________ is a vector quantity.
(Electric field, Electric Field Intensity, Electric charge,
Electric current)
18. In SI units electric field intensity is measured in
__________.
(Ns, N/C, N/J, N/m)
19. The concepts of electric field lines was introduced by a
famous scientist __________
(Newton
20. The electric field lines, always start from a __________.
(Positive charge, Negative charge, Point charge, None of these)
21. The electric field lines, always end at a __________.
(Positive charge, Negative charge, Point charge, None of these)
22. The tangent to the field line at any point gives the direction
of the __________.
(electric field intensity at that point, electric field at that
point, Electrostatic force at that point, Electrostatic force at that point, None
of these)
23. The work done in bringing a unit positive charge from infinity
to certain point, keeping the unit charge is equilibrium is called __________.
(Potential energy, Potential gradient, Electric potential,
Electric field intensity)
24. In SI units electric potential is measured in __________.
(Coulombs, Amperes, Volts, N/C2)
Chapter 13
Current Electricity
1. The net charge flowing across the sectional area per unit time
is known as __________.
(Electric Current, Ampere, Electric flow, none of these)
2. The direction of electric current is that in which __________.
(Negative charge will drift, Positive charge will drift, Both
positive and negative charge will drift, None of these)
3. Mathematically Electric current I in a conductor is defined by
the relation __________.
(I = Qt, Q = I/t, I = Q/t, None of these)
4. The SI unit of current is __________.
(Ampere, Coulomb, volt, None of these)
5. 1A = __________.
(1C/s, 1C/s2, 1J/s, 1N/s)
6. “In a electrical circuit, the potential difference across a
conductor is directly proportional to the current flowing through it, provided
the temperature of the conductor remains the same.” This is called __________.
(Ohm’s Law, Coulomb’s Law, Guass’s Law, None of these)
7. Mathematically Ohm’s Law is written as __________.
(V = IR V = I/R, V = Qt, None of the above)
8. Measure of the opposition to the flow the free electron is
known as __________.
(Current, Resistance, Conductance, Capacitance)
9. The SI unit of electrical resistance is __________.
(Ampere, Volt, Farad, Ohm)
10. If the potential difference of 1 volt is applied across the
end of a conductor and the resulting current flowing through the conductor is
one ampere then the resistance of the conductor is said to be __________.
(1ohm, 1ampere, 1farad, 1volt)
11. 1W (ohm) = __________.
(1VA, 1V/A, 1C/A, 1J/A2)
12. It is experimentally observed that in general the resistance R
of a given wire increases with increase in __________.
(Temperature, Cross-section area of a wire, Length of a wire, none
of these)
13. It is experimentally observed that in general the resistance R
of a given wire decreases with increase in __________.
(Temperature, Cross-section Area, Length of a wire, None of the
above)
14. The change in resistivity per unit original resistivity (or resistance)
per degree change in temperature is called __________.
(Resistance, Conductance, Temperature coefficient of resistivity,
All of these)
15. The resistivity of a class of elements of some critical
temperature T, falls to zero. The materials showing such property are called
__________.
(Semi-conductors, Super-conductors, Insulators, Conductors)
16. The device which can maintain a potential difference between
two points to which they are attached are known as __________.
(Dry cell, sources of power, sources of electromotive force,
sources of heat dissipated)
17. The unit of electromotive force is __________.
(Volt, Ampere, watt, Joule)
18. Batteries or cells convert __________.
(Heat energy into electrical energy, nuclear energy into
electrical energy, kinetic energy into electrical energy, chemical energy into
electrical energy)
19. Electrical generators convert __________.
(chemical energy into electrical energy, kinetic energy into
electrical energy, mechanical energy into electrical energy, light energy into
electrical energy)
20. Thermocouples convert __________.
(chemical energy into electrical energy, heat energy into
electrical energy, mechanical energy into electrical energy, light energy into
electrical energy)
21. Photo voltaic cell converts __________.
(chemical energy into electrical energy, heat energy into
electrical energy, mechanical energy into electrical energy, light energy into
electrical energy)
22. In practice, the sources of emf always have __________.
(Zero resistance, unit resistance, some resistance, infinite
resistance)
23. The emf of a source is equal to the potential difference
across the terminals of the source when either its internal resistance is
__________.
(Zero, Infinite, Zero or infinite, None of these)
24. The electromotive force is written as __________.
(E = W/q, E = Wq, E = Q/I, None of these)
Chapter 14
Magnetism and Electromagnetism
1. Magnetism derives its name from __________, a region in Asia
Minor (Modern Turkey) where it was found in for form of certain iron core.
(Magnesia, Magnesium, Electromagnetism, None of these)
2. __________ is not a magnetic material.
(Iron, Nicker, Cobalt, silver)
3. A body that attracts small pieces of iron and points towards
north-south direction when suspended freely, is called a __________.
(Magnet, Conductor, Magnetism, None of these)
4. Like poles of two magnets __________.
(Attract, Repel, Neither attract nor repel, None of these)
5. Unlike poles of two magnets __________.
Attract, Repel, Neither attract nor repel, None of these)
6. The magnetism of the magnet is concentrated in the __________.
(North pole, South pole, North and South pole, At the middle)
7. If a magnet is broken into two pieces, then __________.
(Two magnets are obtained, Noth pole is obtained, South pole is obtained,
One north pole and one south pole is obtained)
8. The space surrounding a magnet in which its magnetic effect is
felt is called __________.
(North pole, south pole, Middle Point, Magnetic Field)
9. The intensity of the magnetic field near its poles is
__________.
(Zero, Maximum, Minimum, None of these)
10. If the magnetic field is uniform, then the magnetic lines of
forces are __________.
(Curved, Parallel, Perpendicular, None of these)
11. The magnetic field is represented with __________.
(Magnetic lines of forces, Magnetic induction, North pole, South
pole)
12. The path along which an isolated north ple of a magnet moves
in the magnetic field is called __________.
(Magnetic field, Magnetic field lines, North pole, South pole)
13. Two magnetic lines of force __________.
(can intersect each other, do not intersect each other, can repel
each other, can attract each other)
14. __________ behave like a stretched rubber string which tends
to contract longitudinally and expand laterally.
(Magnets, Magnetic Force, Electric Lines of force, Magnetic lines
of force)
15. The magnetic lines of force pass through __________, as
compared to air.
(Water, Iron, Rubber, None of the above)
16. A substance which behaves like a magnet in the presence of a
strong field is called __________.
(Magnets, Ferromagnets, Electromagnets, None of these)
17. A magnet can be demagnetized by __________.
(Heating, By dropping it several time, breaking into two pieces,
both heating and by dropping it several time)
18. The field magnet around a moving charge is called __________.
(Electric Field, Magnetic Field, Gravitational Field, None of the
above)
19. The direction of magnetic lines of force is given by the
__________.
(head to tail rule, right hand rule, left hand rule, none of these)
20. __________ was the first to note the presence of magnetic
force in a wire in which currents are flowing.
(Newton, Ampere, Oersted, None of these)
21. If two wires in which currents are flowing in the same
direction are placed parallel and close to each other then they will
__________.
(Repel each other, Attract each other, Neither attract nor repel
each other, None of the above)
22. If two wires in which currents are flowing in the opposite
direction are placed parallel and close to each other then they will
__________.
(Repel each other, Attract each other, Neither attract nor repel
each other, None of the above)
23. The charge moving parallel to the magnetic field ‘B’ with a
certain velocity ‘v’ experiences __________.
(No force, Maximum force, Minimum Force, None of these)
24. The charge moving perpendicular to the magnetic field ‘B’ with
a certain velocity ‘v’ experiences __________.
(No force, Maximum force, Minimum Force, None of these)
25. The magnetic force Fm acting on charge ‘q’ when it moves with
a velocity ‘v’ through a magnetic field ‘B’ is given by __________.
(Fm = qv x B, Fm = qv2 x B, Fm = qE, None of these)
26. The magnitude of a magnetic force ‘F’ acting on charge ‘q’
when it moves with a velocity ‘v’ through a magnetic field ‘B’ is given by
__________.
(F = qvBsinq, F = qv2Bsinq, vBsinq, None of these)
27. In a magnetic field the charge at rest experiences __________.
(No force, Maximum force, Minimum force, None of these)
28. The charge, which moves along a line parallel to the direction
of magnetic lines of force, experiences __________.
(No force, Maximum force, Minimum force, None of these)
29. Maximum force is experienced by a charged particle when it
moves __________.
(Parallel to magnetic field, with zero velocity, none of these)
30. The SI unit of magnetic induction B is __________.
(Volt, watt, farad, tesla)
31. When an alternating accelerating field is applied to a charge
it produces __________.
(Sound waves, Electromagnetic waves, X-rays, Gamma rays)
32. The wave which require no medium for the propagation are known
as __________.
(Sound waves, Mechanical waves, Electromagnetic waves, None of
these)
33. An electromagnetic wave electric and magnetic fields are
__________.
(Parallel to each other, Perpendicular to each other,Opposite to
each other, None of these)
34. The velocity of electromagnetic waves depend upon __________.
(Magnetic permeability, Electricpermitivity, Both magnetic
permeability and electric permitivity, None of these)
35. Substances having electrical resistivity intermediate between
conductors and insulators are called __________.
(Superconductors, Semiconductors, n-type conductors, p-type
conductors)
36. In Semiconductors __________ are responsible for electrical
conduction.
(Protons, Electrons, Holes, Electrons, holes)
37. When a pentavalent material like As, is added to tetravelent
material i.e. Ge we get a __________.
(n-type material, p-type material, Semiconductors, None of these)
38. In n-type materials __________.
(Holes are majority carriers, Electrons are majority carriers,
Electrons are minority carriers, None of these)
39. When a trivalent material like Indium or Galium is added to
Ge, we get a __________.
(n-type material, p-type material, semiconductor, None of these)
40. In p-type materials __________.
(Holes are majority carriers, Electrons are majority carriers,
Electrons are minority carriers, None of these)
41. Velocity of light is __________.
(3 x 108 m/s, 3 x 106 m/s, 3 x 10 cm/s, None of these)
42. The electromagnetic waves emitted by the I.C circuit of aerial
of a transmitting station are of __________.
(Zero amplitude, Unit amplitude, Constant amplitude, Variable
amplitude)
43. The electromagnetic waves emitted by the I.C circuit of aerial
of a transmitting station have frequency of the range __________.
(102Hz, 104Hz, 106Hz, 108Hz)
44. A crystal diode is used for rectification of __________.
(AC current, DC current, Electromagnetic waves, None of the above)
45. A geometric shape of a solid obtained by regular, repetitive,
three-dimensional arrangements of its molecules, atoms or ions is called a
__________.
(Crystal, Lattice, Crystal plane, None of these)
46. Two substances having the same crystal structure are called
__________.
(Isomorphous Substance, Allotropic substances, True substances,
Polymorphous substances)
47. The substance, which exists in two or more crystal forms under
different condiion is called __________.
(Isomorphous Substance, Allotropic substances, True substances,
Polymorphous substances)
48. A regular, repetitive, three-dimensional pattern of points,
which represent the position of molecules, atoms or ions in the crystal, is
called __________.
(Unit cell, Space lattice, crystal, true substance)
49. The smallest portion of a crystal lattice that if repeated in
three-dimensions will generate the entire lattice is called __________.
(Unit cell, Lattice plane, crystal, none of these)
50. When a crystal is subjected to stress, it tends to break or
fracture along definite direction which is characteristic of a sample. This is called
__________.
(Cleavage, Allotropy, Anisotropy, Homeogeneity)
51. The property due to which the size or shape of a lattice is
not important is called __________.
(Cleavage, Anisotropy, Homogeneity, None of these)
52. In a crystal the density of atoms or molecules does not vary
from direction to direction. This is known as __________.
(Cleavage, Anisotropy, Homogeneity, None of these)
53. If one atom or molecule lies out each of the eight corners of
a cube, it is called __________.
(simple cube, face centred cube, body centred cube, none of these)
54. __________ is a cubic pattern having one extra atom or
molecule at the centre of each of the six faces of the cube.
(simple cube, face centred cube, body centred cube, none of these)
55. __________ is a pattern which has got one more atom at the
centre of a simple cube.
(simple cube, face centred cube, body centred cube, none of these)
56. The electrons, which can wander in the solid, are known as
__________.
(Valence electron, free electron, loosely bound electrons, none of
these)
57. __________ of the following theories could not explain
completely the behaviour of conductors, insulators, and semiconductors.
(energy band theory, free electron theory, valence electron
theory, none of these)
58. The electrons in a solid crystal are supposed to have
different energy levels which can be found by the solution of __________.
(Maxwell’s equation, Schrodinger’s wave equation, Gas equation,
none of these)
59. The solution of Schrodinger’s wave equation shows that the
electrons can exist in some ranges of energy called __________.
(Permissible energy levels, energy bands, conduction band,
forbidden energy levels)
60. The permissible energy levels taken in gourps are called
__________.
(Permissible energy leves, energy bands, conduction bands,
forbidden energy levels)
61. The materials in which valence band and conduction band
overlaps are called __________.
(Insulators, Conductors, Semiconductors, Superconductors)
62. The material in which the highest occupied energy level is
completely filled is called __________.
(Insulator, conductor, semiconductor, superconductor)
63. The material in which the gap between the filled energy band
and next higher permitted energy band is small, is called __________.
(Insulator, Conductor, semiconductor, superconductor)
64. The substances with resistivity of order of 10-4 ohm-metre are
called __________.
(Insulators, semiconductors, conductors, good conductors)
65. The substances with resistivity of the order of 10-8 ohm-metre
are called __________.
(Insulators, semiconductors, conductors, good conductors)
66. At temperature near absolute zero, a pure semiconductor
behaves like __________.
(an insulator, a conductor, a superconductor, none of these)
67. A junction between p-type material and n-type material is
called as __________.
(diode, rectifier, transistor, amplifier)
68. The semi-conductor diode has the property of __________.
(one way conduction, two way conduction, zero conduction, none of
these)
69. A diode can be used as __________.
(oscillator, rectifier, transistor, amplifier)
70. If p-type material of the pn-junction is connected with
positive terminal of the battery and n-type material with negative terminal of
the battery, it is said to be __________.
(forward biased, reversed biased, zero biased, none of these)
71. If p-type material of the pn-junction is connected with
negative terminal of the battery and n-type material with positive terminal of
the battery, it is said to be __________.
(forward biased, reversed biased, zero biased, none of these)
72. A device, which converts an alternating current to a direct
current, is called __________.
(Oscillator, rectifier, amplifier, p-type material)
73. A thin layer of one type of semiconductor material sandwiched
between two relatively thick pieces of other type is termed as __________.
(Diode, rectifier, transistor, oscillator)
74. A transistor consists of __________.
(one pn-junction, two pn-junctions, three pn-junctions, None of
these)
75. For normal transistor operation, E-B junction is always
__________.
(reversed biased, forward biased, zero biased, All of these)
76. A transistor can be used as __________.
(diode, rectifier, amplifier, all of these)
77. The transistor is also used as __________.
(diode, switching device, rectifier, p-type material)
78. If we use two diodes and a centre tapped transformer, we will
get __________.
(half wave rectification, full wave rectification, AC current, all
of these)
79. A forward biased p-n semiconductor diode is called __________.
(L.E.D, Photodiode, Photovoltaic cell, transistor)
80. __________ is generally a reversed biased p-n junction in
which light is allowed to fall on the p-layer through a window provided for
this purpose.
(L.E.D, photodiode, photovoltaic cell, transistor)
81. Transistors has replaced __________.
(diodes, vacuum tubes, rectifiers, photovoltaic cell)
Chapter 15
Atomic Spectra
1. The radiation emitted from hydrogen filled discharge tube, when
viewed by dispersing devices such as prism, gratings etc, shows __________.
(A line spectrum, Continuous spectrum, Linear spectrum, all of
these)
2. When an electron jumps from higher to lower orbit, then
__________.
(Energy is absorbed, Energy is emitted, neither absorbed nor
emitted, none of these)
3. When electron in hydrogen atom jumps from higher orbit into
first orbit. The set of lines emitted is called __________.
(Balmer Series, Lyman Series, Bracket Series, Paschen Series)
4. When an electron in hydrogen atom jumps from higher orbit into
second orbit. The set of lines emitted is called __________.
(Balmer Series, Lyman Series, Bracket Series, Paschen Series)
5. When an electron in hydrogen atom jumps from higher orbit into
third orbit. The set of lines emitted is called __________.
(Balmer Series, Lyman Series, Bracket Series, Paschen Series)
6. When an electron in hydrogen atom jumps from higher orbit into
fourth orbit. The set of lines emitted is called __________.
(Balmer Series, Lyman Series, Bracket Series, Paschen Series)
7. When an electron in hydrogen atom jumps from higher orbit into
fifth orbit. The set of lines emitted is called __________.
(Balmer Series, Lyman Series, Pfund Series, Paschen Series)
8. __________ of the following series in the spectrum of the
hydrogen lies in the visible region of the electromagnetic spectrum.
(Paschen Series, Balmer Series, Lyman Series, Brackett sEries)
9. __________ of the following is not a fundamental postulate of
Bohr’s theory of hydrogen atom.
(The classical theory does not apply in the case of tiny particles
such as electrons, The electron in a stable orbitdoes not radiate energy, The
electron can move in all possible orbits, An atom radiates energy only when an
electron jumps from an allowed orbit of higher energy En to one of the lower
energ Ep)
10. __________ of the following is not a fundamental postulate of
Bohr’s theory of hydrogen atom.
(The total energy of the electron in one of it allowed orbit
remains constant as long as it remains in the same orbit, An electron can not
revolve in an arbitrary orbit. Only those orbits are possible for which the
angular momentum of the electron about the nucleus is an integral multiple of
h/2p, The electron can move in all possible orbits, An atom radiates energy
only when an electron jumps from an allowed orbit of higher energy En to one of
the lower energy Ep)
11. According to Bohr’s theory of hydrogen atom, an electron can
revolve around a proton indefinitely if its path is __________.
(a perfect circle of any radius, a circle of constantly decreasing
radius, a circle of an allowed radius, an ellipse)
12. In a hydrogen atom the radius of the electron orbit is
governed by Bohr’s quantum rule which states that __________.
(the linear momentum of the electron is quantised, the angular
momentum of the electron is quantised, the linear velocity of the electron is
quantised, the angular velocity of the electron is quantised)
13. According to Bohr’s theory of the hydrogen atom, the total
energy of the hydrogen atom with its electron revolving in the nth stationary
orbit is __________.
(proportional to n, proportional to n2, inversely proportional to
n, inversely proportional to n2)
14. The energy of the electron of hydrogen orbiting in a
stationary orbit of radius rn is proportional to __________.
(rn, 1/rn, rn2, 1/rn2)
15. When an electron jumps from the nth (higher orbit) orbit to
the pth orbit (lower orbit), the difference of energy is given by the equation
__________.
(h¦ = En – Ep, h¦ = En + Ep, h¦ = E, h¦ = Lp)
16. The frequency ¦ of electromagnetic radiation is given by the
equation __________.
(¦ = lc, ¦ = 1/l, ¦ = c/l, None of these)
17. The transitions of inner- shell electrons in heavy atoms give
rise to __________.
18. X-rays are a part of electromagnetic spectrum and are
characterized by frequencies higher than those of __________.
(visible radiation, infrared radiation, ultra violet radiations,
none of these)
19. Production of continuous X-rays is due to the __________.
(Acceleration of incident electrons by the nucleus of the target
atom, electron transitions between inner-shells of the target atom, electron
transitions between outer shells of the target atom, annihilation of the mass
of incident electrons)
20. X-rays are __________.
(Positively charged particles, Negatively charged particles,
Neutral particles, None of these)
21. The study of the spectrum of characteristic X-rays helps us to
__________.
(Measure the energy of the incident electrons, measure the
wavelength of the incident electrons, measure the energy of the emitted x-rays,
identify the element of which the target is made)
22. The maximum frequency limit of the continuous x-rays spectrum
depends upon __________.
(the atomic number of the atoms of the target, the kinetic energy
of the incident electrons, the maximum frequency limit of the characteristic
x-rays spectrum, the degree of vacuum in the x-ray tube)
23. The device that produces an intense, monochromatic and
coherent beam of light based on stimulated emission of photons from atoms, is
called __________.
(Laser, x-ray tube, discharge tube, cyclotron)
24. An interesting application of laser is the production of
three-dimensional images called __________.
(Polygons, Holograms, Ovals, None of these)
25. In solid lasers, a fluorescent crystal, such as that of
__________ is used as light amplifying substance.
(Ruby, Glass, semiconductor, all of these)
26. The liquid lasers usually make use of a dye dissolved in
__________ as a light amplifying substance.
(Benzene, Citric acid, methanol, alcohol)
27. The laser device used to fragment gallstones and kidney stones
is called __________.
(Laser beam, Laser scanner, laser lithotropter, ruby laser)
28. When fast moving electrons strike a metal target inside a
partially evacuated tube, then __________ are produced.
(cathode rays are produced, cosmic rays are produced, x-rays are produced,
alpha rays are produced)
29. Product of x-rays is a reverse phenomenon of __________.
(Photoelectric effect, Compton effect, Pair production,
Annihilation of matter)
30. __________ is a wrong statement in the following.
(x-rays are not refracted as they pass from one medium to another,
like visible light, x-rays are diffracted at an obstacle, x-rays can cause
ionization of the atoms of a liquid, x-rays are deflected by electric and
magnetic fields)
31. x-rays were discovered by __________.
(Madam Curie, Rontgen, Coolidge, Laue)
32. X-rays are produced when an element of high atomic weight is
bombarded by high energy __________.
(Protons, Electrons, Neutrons, Photons)
33. __________ of the following parameters of the emitted x-rays
increases when the potential difference between the electrodes of an x-ray tube
is increased.
(Intensity, Frequency, Wavelength, Speed)
Chapter 16
The Nuclear Physics
1. Atom consists of __________.
(Electrons, Protons, Neutrons, All of these)
2. Atom as a whole __________.
(Positively charged particle, negatively charged particle, neutral
particle, none of these)
3. __________ discovered electron.
(R.A. Milikan, J.J. Thomson, Crooks, Einstein)
4. Based on the concepts of modern physics, atoms of the known
elements possesses a structure consisting of a central core of the tom called
__________.
(proton, nucleons, nucleus, radius)
5. Rutherfords experiment on the scattering of alpha particles by
thin foils establishes the existence of __________.
(a negatively charged nucleus, a positively charged nucleus,
neutrons in the nucleus, even distribution of charge in the atom)
6. Nucleus contains __________.
(electrons and protons, protons and neutrons, electrons and
neutrons)
7. Neutron was discovered by __________.
(Crooks, J.J Thomson, Chadwick, none of these)
8. The total number of nucleons in the nucleus is called
__________.
(Atomic number, Mass number, Mole, Gram mole)
9. The total number of electron around the nucleus or total number
of protons in the nucleus is called __________.
(Atomic number, Mass number, Avogadro’s number, Gram mole)
10. Nuclei of different elements are identified by their
__________.
(Atomic number, Mass number, Avogadro’s number, Gram mole)
11. F.W Aston developed on instrument, which uses electric and magnetic
fields to sort out atoms according to their masses. This instrument is called
__________.
(Cyclotron, Betatron, Mass Spectrometer, Barometer)
12. Nuclei of the same element having the same Z but different
values of N are called __________.
(Isotopes, Isobars, Isomers, Allotropes)
13. Nuclei of different elements with the same number A are called
__________.
(Isotopes, Isobars, Isomers, Allotropes)
14. Hydrogen has __________.
(One isotope, two isotopes, three isotopes, four isotopes)
15. The nucleus of hydrogen with symbol 1H1 is called __________.
(Proton, Deutron, Triton, all of these)
16. The nucleus of hydrogen with symbol 1H2 is called __________.
(Proton, Deutron, Triton, all of these)
17. The nucleus of hydrogen with symbol 1H3 is called __________.
(Proton, Deutron, Triton, all of these)
18. The process of separation of 92U235 from natural uranium is
called __________.
(Enrichment, Separation, Annhilation, Fusion)
19. Nuclear forces are __________.
(short range forces, long range forces, independent of distances,
none of these)
20. The amount of energy required to break the nucleus into its
constituent particles is called __________.
(Mass defecit, binding energy, ionization energy, ionization
potential)
21. The emission of rays from the nucleus is called __________.
(Annhilation of matter, Disintegration of atoms, Radioactivity,
Fission)
22. Atomic number with atomic number Z>82 are __________.
(stable, unstable, small, none of these)
23. __________ is not a radioactive element.
(Polonium, Radium, Uranium, Hydrogen)
24. Radioactive elements emit __________.
(a-rays, b-rays, g-rays, all of these)
25. The mass of each a-particle is nearly __________.
(twice times the mass of hydrogen atom, three times the mass of
hydrogen atom, four times the mass of hydrogen atom, five times the mass of
hydrogen atom)
26. a-particle is __________.
(Positively charge, negatively charge, neutral, None of these)
27. Charge on each a-particle is equal to __________.
(the Charge on proton, twice the charge on proton, three times the
charge on proton, four times the charge on proton)
28. __________ of the following particles has very high ionization
capability.
(a-particle, b-particle, g-particle, all of these)
29. __________ of the following particles has very low penetration
power.
(a-particle, b-particle, g-particle, all of these)
30. __________ of the following particle can induce artificial
rdioactivity in certain nuclei.
(a-particle, b-particle, g-particle, all of these)
31. X-rays are found to be in __________.
(electromagnetic waves, electrons, fastly moving helium nucleus,
fastly moving neutron)
32. __________ of the following particles consists of fast moving
electrons.
(a-particle, b-particle, g-particle, all of these)
33. __________ of the following particles has less kinetic energy.
(a-particle, b-particle, g-particle, all of these)
34. __________ of the following particles move with velocity of
light.
(a-particle, b-particle, g-particle, all of these)
35. X-Rays are __________.
(Positively charged, negatively charged, neutral, none of these)
36. __________ rays or particles are not deflected by electric and
magnetic field.
(a-particle, b-particle, g-particle, all of these)
37. When g-rays are bombarded on metals, they emit __________.
(Protons from the metal surface, neutrons from the metal surface,
electrons from the metal surface, all of these)
38. The penetrating power of g-rays is about hundred times larger
than that of __________.
(Photons, a-rays, b-rays, electrons)
39. g-rays are electromagnetic radiations similar to __________.
(radiowaves, photons, x-rays, b-rays)
40. Unstable isotopes are called __________.
(Isobars, isomers, radioactive isotopes, none of these)
41. Isotopes differ only in the number of __________.
(electrons, protons, neutrons, none of these)
42. When a nucleus wmits an alpha radiation/particles its atomic
number drops by __________.
(1, 2, 3, 4)
43. When a nucleus emits an alpha radiation/particles its nucleon
number drops by __________.
(1, 2, 3, 4)
44. When an element emits b-particles, its mass numbers A
__________.
(increases by 1, decreases by 1, remains same, becomes zero)
45. When an element X emits gamma-rays, its atomic number Z
__________.
(Increases by 1, decreases by 1, remains same, none of these)
46. When an element X emits gamma rays, its mass number A
__________.
(increases by 1, decreases by 1, remains sme, none of these)
47. Out of the following __________ is not emitted by a
radioactive substance.
(electrons, electromagnetic radiations, helium nuclei with a
charge equal to that of two protons, neutrons)
48. The time required for the element to decay to one half of its
original number is called __________.
(Transmutation, half-life, nuclear decay, none of these)
49. It has been observed that, on the average, the actual number
of atoms which decay at any instant is __________.
(inversely proportional to the number of atoms present, directly
proportional to the number of atoms present, inversely proportional to the
square of the total number of atoms present, inversly proportional to the
square root of the total number of atoms present)
50. The half life of a radioactive substance is 10days. This means
that __________.
(the substance completely disintegates in 20 days, the substance
completely disintegrates in 40days, 1/8 part of the mass of the substance will
be left intact at the end of 40 days, 7/8 part of the mass of the substance
disintegrates in 30 days)
51. The half-life of a radioactive substance depends upon
__________.
(its temperature, the external pressure on it, the mass of the
substance, the strength of the nuclear force between the nucleons of its atoms)
52. __________ of the following conservation laws must be obeyed
in a nuclear reaction.
(the conservation of electric charge, the conservation of energy
and mass, the conservation of linear momentum, the conservation angular
momentum, all of these)
53. __________ of the following particles is considered as an
ideal projectile for induced nuclear reactions.
(Electrons, Proton, neutron, g-particle)
54. When mass m is converted into energy it release energy equal
to __________.
(mc2, mc3, m2c, mc)
55. The splitting of nuclei of a substance into two or more
fragments, with emission of energy, its called __________.
(Nuclear fission, Nuclear fusion, a-decay, None of these)
56. The process in which two smaller nuclei combine to corm a big
nucleus with release of energy is called __________.
(Nuclear fission, Nuclear fusion, a-decay, none of the above)
57. In a fission reaction each nucleus emits about __________.
(one to two neutrons, two to three neutrons, one to two electrons,
two to three electrons)
58. __________ give more energy.
(Nuclear Fission, Nuclear Fusion, Burning of Coal, None of these)
59. The sun which is largest source of heat energy gets its energy
by the process of __________.
(Nuclear Fission, Nuclear Fission, Nuclear Chain reaction, all of
these)
60. Atomic bomb is based on the principle of __________.
(Nuclear Fission, Nuclear Fusion, Nuclear Chain Reaction, None of
these)
61. Hydrogen bomb is based on the principle of __________.
(Nuclear Fission, Nuclear Fusion, Nuclear Chain Reaction, None of
these)
62. A device which is used to extract nuclear energy with easier
means and with out any harm to environment and human beings and utilize the
energy for fruitful purposes in everyday life and work is __________.
(Cyclotron, Nuclear Reactor, Hydrogen bomb, Betatron)
63. Graphite and heavy water are two common moderators used in a
nuclear reactor. The function of the moderator is __________.
(to slow down the neutrons to thermal energies, to absorb the
neutrons nad stop the chain reaction, to cool the reactor, to control the
energy released in the reactor)
64. Cadmium rods are used in nuclear reactor for __________.
(slowing down fast neutrons, speeding up slow neutrons, absorbing
neutrons, regulating the power level of the reactor)
65. In Liquid Metal Fast Breeder Reactor we use __________.
(water as coolant, Sodium metal as coolant, graphite as coolant,
none of these)
66. __________ nuclear radiation detector is based on the
principles “that supersaturated vapours condense more readily on ions or dust
particles”.
(Wilson Cloud chamber, Geiger counter, Solid state detector, none
of these)
67. the Solid-State Detector is basically __________.
(a forward biased pn-junction, a reversed biased pn-junction, a
forward biased transistor, a photocell)
Chapter 17
Advent of Modern Physics
1. Modern physics consists of __________.
(Newtonian Mechanics, Einstein’s special theory of relativity,
Schrodinger’s wave mechanics, Einstein’s special theory of relativity and
Quantum mechanics)
2. The most fundamental to classical physics is/are __________.
(Maxwell’s equations, Schrodinger’s wave equation, Law of
newtonian mechanics, Special theory of relativity)
3. __________ believed in absolute time.
(Einstein, Maxwell, Galileo, Galileo and Newton)
4. A set of coordinate axes with respect to which measurements are
made is called __________.
(frame of reference, inertial frame of reference, non-inertial
frame of reference, none of these)
5. Every motion is __________.
(relative, absolute, zero, none of these)
6. A frame of reference in which Newton’s laws of motion are valid
is called __________.
(Cartesian frame of reference, inertial frame of reference,
non-inertial frames of reference, absolute frame of reference)
7. A frame of reference in which Newton’s laws of motion are not
valid is called __________.
(Cartesian frame of reference, inertial frame of reference,
non-inertial frames of reference, absolute frame of reference)
8. __________ of the Newtonian laws don not hold in an accelerated
frame of reference.
(Newton’s first and second law of motion, Newton’s scond and third
law of motion, third law of motion, Newton’s first law of motion and law of
Gravitation)
9. __________ of the following statements is not correct.
(the law of physics are the same in all inertial frames, the speed
of light in free space has the same value in all inertial frames, two events
which occur simultaneously in one reference frame also must appear to occur
simultaneous in another reference frame, Einstein rejected Newton’s idea of
absolute time)
10. The simple assumption that all possible reference frames
moving with uniform velocity relative to one another are equivalent for the
statement of laws of physics is called the __________.
(Principle of Relativity, Uncertainity Principle, Pauli’s
Exclusion Principle, None of these)
11. Special theory of relativity states that __________.
(All laws of physics are the same in every inertial reference
frame, Every motion is relative, Light has dual nature, Energy and mas are
interconvertable)
12. Special theory of relativity states that __________.
(Time is absolute, The speed of light in a vacuumm, measured in
all inertial reference frames always has the same value of c, no matter how
fast the source of light and the observer are moving relative to each other,
space is absolute, at rest mas of an object is always zero)
13. A body of some material capable of absorbing all heat
radiation incident on it and can emit in turn all the radiation at constant
temperature after it is in equilibrium with it is called __________.
(Black body, Black body radiation, Black body cavity, Cavity
radiation)
14. Rayleigh Jeans theory is incomplete disagreement with the
experimental curve of black body radiation __________.
(In the region of short wavelength, in the region of long
wavelength, both in the region of short and long wavelength, none of these)
15. Wein’s theory is complete disagreement with the experimental
curve of black body radiation __________.
(In the region of short wavelength, in the region of long
wavelength, both in the region of short and long wavelength, none of these)
16. In 1900, __________ proposed a formula which explained I
detail the whole shape of the black body spectrum for all wavelengths.
(Wein, Rayleigh, Einstein, Maxwell Plank)
17. __________ proposed quantum theory of radiation.
(Wein, Einstein, Plank, Newton)
18. __________ theory explains that energy exchange takes place in
discrete “bundles” or “quanta”.
(Special theory of Relativity, Quantum Theory, Corpuscular Theory,
Bohr’s Theory)
19. Mathematically Quantum theory is states as __________.
(E = mc2, E = hf, v = nl, none of these)
20. Light consists of particle wave called __________.
(Proton, Electron, Neutron, Photon)
21. The rest mass of photon is __________.
(One, Zero, Infinite, None of these)
22. In 1905, __________ proposed that the packets or bundles of
energy are integral part of all electromagnetic radiations.
(Plank, Einstein, Newton, Wein)
23. The process of ejection of loosely bound electrons from a
metallic surface by the absorption of photons is called __________.
(Pair production, Compton Effect, Photoelectric effect,
Uncertainity Principle)
24. The photoelectric effect establishes that __________.
(Light travels in the form of inertial of quanta of energy, Light
travels in the form of transverse waves, light travels in the form of
longitudinal waves, light is a transverse electromagnetic wave)
25. The photoelectric emission from the surface of a metal starts
only when the light incident on the surface has a certain __________.
(minimum frequency, minimum wavelength, minimum intensity, minimum
speed)
26. At frequencies of the incident radiation above the threshold
frequency, the photoelectric current in a photoelectric cell increases with the
increase in __________.
(intensity of incident radiation, wavelength of incident
radiation, frequency of incident radiation, speed of incident emitted from a
metal surface)
27. The photoelectrons emitted from a metal surface __________.
(are all at rest, have the same kinetic energy, have the same
momentum, have speeds varying from zero up to a certain maximum value)
28. For each material emission occurs only for certain definite
frequency fo of light called __________.
(1 Hertz, Critical frequency, threshold frequency, minimum
frequency)
29. Amount of energy in a photon depends on the __________.
(rest mass, frequency, momentum, wavelength)
30. The minimum energy of an electron that must have in order to
escape from the metal surface is called __________.
(Stopping potential, work function, threshold frequency,
wavelength)
31. Photoelectric effect is a phenomenon in which electromagnetic
waves exhibit __________.
(wave nature, particle nature, both wave and particle nature, none
of these)
32. In Compton effect __________.
(The scattered photon has frequency less than that of the incident
photon, the scattered photon has frequency greater than that of the incident
photon, the scattered photon has frequency equal to the incident photon, none
of these)
33. On moving from one place to another electromagnetic radiation
behaves as __________.
(particles, waves, both particles and waves, none of these)
34. Electromagnetic radiation when interact with material particle,
behaves as __________.
(particles, waves, both particles and waves, none of these)
35. When we try to stop a very high photon it loses its identify
and disintegration into an electron and a positron. This is called __________.
(Pair production, Annihilation, X-rays production, Compton effect)
36. A process reverse to the pair production is known as
__________.
(Photoelectric effect, Annihilation, X-rays production, Compton
Effect)
37. When an electron and a positron combine together in such a way
that both of them disappear and their combined mass reappear as two gamma ray
photons. This is called __________.
(Photoelectric effect, Annihilation, X-rays production, Compton
effect)
38. “The product of the uncertainties in momentum (Dp) and
position)Dx) of particle at some instant is approximately fo the order of
Plank’s constant h”. This is called __________.
(Pauli’s Exclusion Principle, Heisenberg Uncertainity Principle,
Photoelectric effect, Compton effect)
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