1 - "God Particle" is
Higgs Boson
2 - 0.001 kg mass will be equivalent to
25.00 GWh
3 - A . C and D . C have the same
heating effect through a resistance
4 - A . C can not be used for
Magnetizing iron
5 - A . C cannot be used for
magnetizing and electroplating
6 - A 25eV electron has a speed of
3 x 106m/sec
7 - A 5 Degree F capacitor has a potential difference across its plates of 200 volts. The charge on the capacitor is
10-5 C
8 - A capacitor is a perfect insulator for
direct current
9 - A capacitor of capacitance 30 Degree F is charged by a constant current of 10mAIf initially the capacitor was uncharged what is the time taken for the potential difference across the capacitor to reach 300V?
0.9sec
10 - A certain stress applied to an elastic material produces a certain strain in it. If the elastic limit is not exceeded the energy gained per unit volume of the material is given by
(Stress / strain)
11 - A changing magnetic flux produces around itself an induced
Electromagnetic force
12 - A charge of 0.10C accelerated through a potential difference of 1000V acquires kinetic energy
100J
13 - A choke is used as a resistance in
AC circuits
14 - A closed surface contains two equal and opposite charges. The net electric flux from the surface will be
zero
15 - A completely filled band is called
Core band
16 - A device based on photoelectric effect is called
photo cell
17 - A device for producing high velocity nuclei is
linear accelerator
18 - A dynamo converts
mechanical energy into electrical energy
19 - A ferromagnet will become fully magnetized at
Alternating current at its peak value
20 - A fuse is placed in series with the cireuit to protect against
over heating
21 - A galvanometer basically is an instrument used to
detect current in a circuit
22 - A hollow metallic sphere of 8cm diameter is charged with 4 x 10 8
900 volts
23 - A light ray travelling from denser to rarer medium at an angle of incidence more than critical angle of concerned media pair suffers.
Total internal reflection
24 - A magnetic compass will be deflected if it is kept near a
charge in motion
25 - A magnetic field
exerts a force if the charged particle is moving perpendicular to the magnetic field lines
26 - A mass spectrograph (spectrometer) sorts out
ions
27 - A metal rod of 25 cm length is moving at a speed of 0.5/sec in direction perpendicular to 0.25T magnetic field. Emf produced in the rod is
0.03125 volt
28 - A moving coil galvanometer of resistance 100 ohm gives half scale deflection for a current of 20mA. What will be the potential difference across it?
2 volt
29 - A particle having the mass of an electron and the charge of a proton is called a
positron
30 - A particle of mass m charge q and speed V enters a uniform magnetic radius r. The radius r of the circle is
directly proportional to m
31 - A photon is
a quantum of electromagnetic radiation
32 - A photon of wave length 900nm behaves like a particle of mass
2.46 x 10-36kg
33 - A pure variable resistor is connected in series with a pure capacitor of fixed capacitance. The impedance of the circuit
Increases
34 - A rubber cord of cross-sectional area 2cm2 has a length of 1m. When a tensile force of 10N is applied the length of the cord increases by 1cm. What is the youngs modulus of rubber?
5x106 Nm-2
35 - A sensitive galvanometer gives full-scale deflection with 100 mV. If the resistance of the galvanometer is 50 Ohm the maximum current that can flow through safely is
2.0 mA
36 - A small coil lies inside a large coil. The two coils are horizontal concentric and carry currents in opposite directions. The large coil will experience
No resultant force
37 - A small gap is left at the joints of rails in a railway track to
Avoid the tracks being distorted due to seasonal temperature variation
38 - A three dimensional image is obtained by
Seanning electron microscope
39 - A uniform steel wire of length 4m and area of cross-section 3x10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2x1011 Nm-2 the energy stored in the wire is
0.75J
40 - A vacant or partially filled band is called
Conduction band
41 - A wheat stone bridge is said to be balanced when
potential difference across galvanometer branch is zero
42 - A wire having very high value of conductance is said to be
very good conductor
43 - A wire is stretched by a force F which causes an extension
The energy stored in the wire is
44 - A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F
(F1+F2) (12-11)
45 - A wire of uniform area of cross-section A length L and resistance R is cut into two parts. Resistivity of each part
remains the same
46 - A wire suspended vertically from one end is stretched by attaching a weight of 20N to the lower end. The weight stretches the wire by 1mm. How much energy is gained by the wire?
0.01J
47 - Acceptor and donor impurities donate
p-carriers and n-carriers respectively
48 - According to which one of following law the density of atom is uniform?
J.J.Thomson model
49 - After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light
Remains same
50 - All electrical appliances are connected in parallel to each other between the main line and neutral wire to get
different current but same potential difference
51 - Ammeter connected in an AC circuit measures
rms value of current
52 - An aeroplane of wingspan 10m flies from the equator towards the North Pole. The wings are perpendicular to the vertical component of the earths magnetic field (B = 4x10-5T). At maximum speed an emf of 96mV is induced across the wing tips. The maximum spee
384msec-1
53 - An alternating current of r.m.s value of 4.0 A and frequency 50Hz flows in a circuit containing 10 ohm resistor. The peak current is then
5.66A
54 - An alternating current or voltage
changes its magnitude continuously and reverses its direction of flow after regularly recurring intervals.
55 - An alternating current or voltage
changes its direction again and again
56 - An ammeter measures the total current flowing through a circuit when it is connected
in series with the circuit
57 - An electric charge at rest produces
only an electric field
58 - An electric current induced within the body of a conductor when that conductor either moves through a non uniform magnetic field or in a region where there is a change in magnetic flux is called
Eddy current
59 - An electric field can deflect
none
60 - An electric iron is marked 20 volts 500W. The units consumed by it in using if for 24 hours will be
12
61 - An electromagnetic wave consists of
Electric and magnetic fields moving perpendicular to each other
62 - An electron enters a region where the electric field E is perpendicular to the magnetic field
B = eE/V
63 - An immersion heater of 400 watts kept on for 5 hours will consume electrical power of
2KWh
64 - An inductor may store energy in
its magnetic field
65 - An instrument which can measure potential without drawing any current is
cathode ray oscilloscope (CRO)
66 - An observer shoots parallel to a meter stick at very high (relativistic) speed and finds that the length of meter stick is
less than one meter
67 - An OP-AMP comparator is a circuit that compares the signal voltage on one of its inputs with a _
Reference voltage on the other
68 - An OP-AMPs can amplify
A . C .
69 - Antimatter consists of
all of above
70 - Any alteration produced in shapes length or volume when a body is subjected to some external force is called
Deformation
71 - As the temperature of black body is raised the wavelength corresponding to maximum intensity
shifts towards shorter wavelength
72 - Average distance covered by ?-particle in air before its ionizing power ceases is called its
range
73 - Average energy required to remove one nucleon from the nucleus is called
binding energy per nucleon
74 - Bracket series is obtained when all transition of electron terminate on
4th orbit
75 - capacitor is to have an energy content of 20J it must be placed across a potential difference of
2 volts
76 - CFC is used in
all of above
77 - Charge on an electron was determine by
Millikan
78 - Charge on neutron is
zero
79 - Choose the correct statement. In the case of AC circuit ohms law holds for
All of the above
80 - Circuit which gives continuously varying potential is called
potential divider
81 - cmf generated by A . C dynamo depends upon
all of above
82 - Coercive force is the force which opposes
Demagnetization
83 - Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always
BINA
84 - Compton effect proves the
Photon theory of light
85 - Current produced by moving the loop of wire across a magnetic field is called
induced current
86 - Danger signals are generally red as red light
Undergoes least deviation
87 - Davison Germer experiment indicates
election diffraction
88 - Depletion region of a junction is formed
during the manufacturing process
89 - Diameter of an atom is approximately
10-10m
90 - During an encounter with an atom ?-particle knocks out
electrons
91 - During fission process a large amount of
nuclear energy is released
92 - During fusion of hydrogen into helium
energy is released
93 - Electric charge of 100 ?C is 13cm apart from another charge 16.9 Degree C electric force between them is
900N
94 - Electric flux linked with a surface will be maximum when
the surface is held perpendicular to the electric field
95 - Electric force between two point charges in air or vacuum is F. If we replace air or vacuum by an insulator (dielectric) of relative permitivity Cr the force between the charges will
decrease
96 - Electric intensity at infinite distance from the point charge is
zero
97 - Electric intensity being a vector quantity always points
along the direction of force experienced by a unit positive charge
98 - Electrical energy is converted to heat at the rate of
I2R
99 - Electrical energy is measured in
kilowatt hour
100 - Electromagnetic waves emitted from antenna are
Transverse
101 - Electromagnetic waves transport
Energy
102 - Electromagnetic waves travel in free space with the speed of
?-rays
103 - Electron cannot exist in the nucleus it is confirmed by observing that
The velocity of electron must be very high according to uncertainty principle.
104 - Electron moves in the orbit as
Standing wave motion.
105 - Electrons
cannot exist inside the nucleus
106 - Electrons present in p-type material due to thermal pair generation are
minority carriers
107 - emf induced in a circuit according to Faradays law depends on the
rate of change of magnetic flux
108 - Energy liberated when one atom of U-235 undergoes fission reaction is
200MeV
109 - Energy needed to magnetize and demagnetize is represented by
Hysteresis loop area
110 - Energy stored in a magnetic field is given by
LI2/2
111 - Equipotential planes are
parallel to one another
112 - Equivalent capacitance is greater than individual capacitances in
parallel combination
113 - Excited atoms return to their ground state in
10-8s
114 - Fission chain reaction in a nuclear reactor can be controlled by introducing
cadmium rods
115 - For chain reaction to build up the size of the radioactive target should be
greater than the critical size
116 - For confinement of electron in a box of radius 10-14m the electron speed should be
Should be greater than speed of light.
117 - For electroplating we use
A D . C source
118 - For every action, there is an equal and opposite reaction, is Newton's
Third law
119 - For long distance transmission the transformer used is
Step up
120 - Formation of large molecule by joining small molecules is
Polymerization
121 - Forward current through a semi conductor diode circuit is due to
majority carriers
122 - Galvanometer is a very sensitive device with
very low damping
123 - Gamma rays can cause
Gene mutation
124 - Gas thermometers are more sensitive than the liquid thermometers because the gases
Have large coefficient of expansion
125 - Geiger counter is suitable for
slow counting
126 - Green house effect is the heating up of the Earth's atmosphere which is due to
The infra-red rays
127 - Half life of radium is 1590 years. In how many years shall the earth loss all its radium due to radioactive decay?
never
128 - Heating a magnet will
weaken it
129 - Hole is equivalent to
a positive charge
130 - Holes can exist in
Semi conductors
131 - How much heat does a 40 W bulb generates in one hour?
144000J
132 - Hydrogen atom does not emit X-rays because
it has a single electron
133 - Identify the correct statement about minority carriers
holes in n-type and free electrons in p-type
134 - If 1 ampere current flows through 2m long conductor the charge flow through it in 1 hour will be
3600C
135 - If a charged rod is brought closer to a gas filled balloon then
Radius increase
136 - If a current carrying solenoid is suspended freely it will
come to rest in N-S direction
137 - If a diffraction grating is placed in the path of a light beam it reveals
Wave property
138 - If a glass plate is inserted in between the plate of a capacitor in series with a lighted bulb the brightness of the bulb
Brightness increases
139 - If a material object moves with speed of light its mass becomes
infinite
140 - If an electrons is allowed to move along the field in a non uniform electric field then it will follow
Straight line
141 - If capacitance of L-C circuit is made four times then frequency of the circuit becomes
One half
142 - If free space between the plates of a capacitor is replaced by a dielectric
The potential difference decreases but both capacitance and energy increase
143 - If metallic conductor is charged negatively then its weight
Increases for a while
144 - If mica sheet is placed between the plates of a capacitor the capacity
increases
145 - If one or more of the neutrons emitted during fission cab be used to build up further fission then the reaction is self sustained and is known as
chain reaction
146 - If the coil is wound on an iron core the flux through it will
increase
147 - If the density of atoms remain same along any direction in a crystal is called
Homogeneity
148 - If the distance between the two point charges become half then force between them becomes
four times
149 - If the secondary coil has Ns turns and the primary Np turns the relation between secondary and primary voltages is given by
Vs/Vp = Ns/Np
150 - If the temperature of a place increases suddenly, the relative humidity
Decreases
151 - If the wavelength of incident radiation is increased in photoemission then
The average kinetic energy of the photoelectrons decreases.
152 - If two charges are increased by two times then force
Increases 4 times
153 - In a charged capacitor the energy resides in
electric field
154 - In a half-wave rectifier the r.m.s. value of the A . C .component of the wave is
More than D . C .value
155 - In a multi range ammeter as the range increases
shunt value decreases
156 - In a non-uniform electric field a polar molecule will experience
both series and parallel combinations
157 - In a photoelectric effect monochromatic light is incident on a metal surface. If the incident light of twice the intensity but of same wavelength the kinetic energy of the emitted electron
Remains same
158 - In a refrigerator what produces the cooling ?
None of these
159 - In a refrigerator, the cooling system should always be
At the bottom
160 - In a semiconductors the charge carriers are
Electron and holes both
161 - In an LCR series circuit, if V is the effective value of the applied voltage VR is the voltage across R VL is the effective voltage across L & Vc is the effective voltage across C then
V2 = VR2+(VL-VC)2
162 - In an X-ray tube electrons each of charge e are accelerated through V potential difference allowed to hit a metal target. The wavelength of the X-rays emitted is
he/ev
163 - In beta decay what is emitted?
Electron
164 - In Compton scattering the change in wave length is max if
angle of scattering is 180 Degree
165 - In Davisson-Germer experiment the diffracted proton from crystal shows
Wave property
166 - In electron microscope electric & magnetic fields are used as
Converging source of electrons.
167 - In electron microscope we use energetic particles because of
Wavelength is very short.
168 - In forward bias the width of potential barrier
Decreases
169 - In full wave rectification the output D . C .voltage across the load is obtained for
The complete cycle of input A . C .
170 - In half-wave rectification the output D . C .voltages is obtained across the load for
The positive half cycle of A . C .
171 - In He-Ne laser the lasing action is produced by
Ne only.
172 - In hydrogen spectrum which one of the following series lies in the ultraviolet region?
Lymann series
173 - In laser production the state in which more atoms are in the upper state than in the lower one is called
Inverted population.
174 - In liquid metal fast breeder reactor the type of uranium used is
92U238
175 - In liquids and gases the current is due to the motion
both negative and positive charges
176 - In mirrors the back surface is coated with a thin layer of :
Silver
177 - In normal state of energy the incident high energy photons will be
Absorbed.
178 - In n-p-n transistor, p works as
base
179 - In nucleus of uranium the number of neutrons will be
different for different isotopes
180 - In obtaining an X-ray photograph of our hand we use the principle of
shadow photograph
181 - In p-n-p transistor the collector current is
slightly less than emitter current
182 - In severe winter, in cold countries water pipes burst because
Water expands on freezing
183 - In simple cube one atom or molecule lies at its
Eight corners
184 - In the transistor schematic symbol, the arrow
is located on the emitter
185 - Inductors acts as a short circuit for
DC
186 - Internal resistance is the resistance offered by
source of e m f
187 - Lagging of changes in the magnetization of a substance behind changes in the magnetic field as the magnetic field is varied is known as magnetic
Hysteresis
188 - Linear momentum of a photon is
zero
189 - Long distance transmission is easy for
A . C voltage
190 - Magnetic compass needle will be deflecting if it is kept near
Accelerating charge
191 - Magnetic flux and flux density are related by
magnetic flux = flux density x area
192 - Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called
magnetic induction
193 - Many of the semi conductors are crystals of the type
Face centred cubic
194 - Mark the wrong statement.
Newtons laws of motion are valid in an accelerated (non inertial) frame of reference
195 - Mass defect per nucleon is
packing fraction
196 - Mass of neutron is
1.67 x 10-27 kg
197 - Materials in which valence electrons are tightly bound to their atoms at low temperature are called
Insulators
198 - Materials that undergo plastic deformation before breaking are called
Ductile
199 - Maximum frequency in the spectrum from X-ray tube is directly proportional to the
The kinetic energy of the incident electron i.e. the potential difference through which they are accelerated.
200 - Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is
current sensitivity
201 - N/C =
V/m
202 - Neutron and proton are commonly known as
nucleon
203 - Newton's first law of motion gives the concept of
Inertia
204 - Non inductive resistances are used in decreasing
Self inductance
205 - Non-inverting amplifier circuits have
A very high input impedance
206 - Nuclear Fission is caused by the impact of
Neutron
207 - Nuclear forces exist between
all of the above
208 - Nuclei having the same mass number but different atomic number are
Isobars
209 - On the basis of band theory of solids the semiconductors have
A completely filled valence band a partially filled conduction band and a narrow forbidden band
210 - One amu is equal to
all of above
211 - One kilowatt hour is the amount of energy delivered during
one hour
212 - Pair production cannot take place in vacuum as
momentum is not conserved
213 - Pair production cannot take place in vacuum as ________ is not conserved
momentum
214 - Pair production takes place in the vicinity of a heavy nucleus so that
all of the above
215 - Photocopier and inject printer are dealt in
Electrostatics
216 - Photon of highest frequency will be absorbed when transition takes place from
1st to 5th orbit
217 - Pipelines in cold countries often burst in winter, because
Water freezes and expands in its volume
218 - p-n junction when reversed biased acts as a
off switch
219 - Potential difference is the work done in moving unit positive charge form one point to another
against electric intensity
220 - Power loss in actual transformer is due to
Eddy currents and magnetic hysterias
221 - Production of heat due to an electric current flowing through a conductor is given by
Joule effect
222 - pure resistor circuit the voltage and current are
They have zero phase difference
223 - Radiation produced from TV picture tube is
X-rays
224 - Radiation with wavelength longer than red lights
infra red radiation
225 - Radioactive materials can be identified by measuring their
half life
226 - Radioactivity is a ______ (A) Spontaneous activity (B) Chemical property
C & A
227 - Radiocarbon dating technique is used to estimate the age of
Fossils
228 - Railway tracks are banked on curves so that
Necessary centripetal force may be obtained from the horizontal component of the weight of the train
229 - Ratio of the weight of H-atom to that of an electron is approximately
1836
230 - Reciprocal of resistivity is called
conductivity
231 - Reflecting mirrors in laser is used to
Further stimulation
232 - Resistance of a conductor depends upon
all of above
233 - Resistance of a super conductor is
zero
234 - Resistance of a wire on increasing its temperature will
increase with rise in temperature
235 - Resistance of an ideal insulator is
infinite
236 - Rest mass of a photon is
zero
237 - Reverse process of photoelectric effect is
X-rays production
238 - Selenium becomes a conductor in light so it behaves like
Photodiode
239 - Self inductance of a coil depends upon
all
240 - Semi-conductor germanium and silicon are
tetravalent
241 - Semi-conductors with donor atoms and free electrons belong to the type
n
242 - SI unit of flux density is
NA-1m-1
243 - SI unit of permitivity of free space is
N-1m-2C2
244 - Specific resistance of a wire
will depend on the type of material of the wire
245 - Stopping potential for a metal surface in case of photoelectric emission depends on
the frequency of incident light and work function of the metal surface
246 - Sum of the masses of constituent nucleons as compared to the mass of the resultant nucleus is
greater than 82
247 - Terminal potential difference of a battery is greater than its emf when
the battery is charged
248 - The alternating voltage is an example of
An analogue waveform
249 - The angular position of cells remains the same for a sample of a crystal. This property is called
The external symmetry of form
250 - The band theory of solids explains satisfactorily the nature of
All of the above
251 - The bats can fly in the dark because
They generate ultrasonic sound waves
252 - The bending of light when it passes around a corner or a slit is due to ________
Diffraction
253 - The blue colour of water in the sea is due to
Absorption of other colours except blue by water molecules
254 - The bombardment of nitrogen with ?-particles will produce
Proton
255 - The breaking of crystals along definite direction is called
Cleavage
256 - The bulk properties of materials such as their mode of fracture can be related to their
Microstructure
257 - The centre of gravity of a sprinter during the race lies
Ahead of his feet
258 - The characteristic invalid for heat radiation is that it travels :
With the speed of light
259 - The characteristic X-rays spectrum is due to
The bombardment of target by electrons.
260 - The charged particle enters the uniform magnetic field in such a way that its initial velocity is not perpendicular to the field the orbit will be
helix
261 - The colour of the ocean appears to be blue because the sunlight falling on it is
Scattered
262 - The curie temperature is that at which
Ferromagnetic becomes paramagnetic
263 - The current through a metallic conductor is due to the motion of
free electrons
264 - The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12 ohm. Galvanometer resistance is
12 ohm
265 - The density of the liquid when heated
Decreases
266 - The device or circuit used for conversion of A . C .into D . C .is called
A rectifier
267 - The device used for conversion of D . C .to A . C .is called
Oscillator
268 - The device used for locating submerged objects under sea is.
Sonar
269 - The direction of propagation of an electromagnetic waves is
Perpendicular to both electric and magnetic field
270 - The effective way to increase the sensitivity of a moving coil galvanometer is to
use a very strong magnetic field
271 - The electric lines of force are
imaginary
272 - The electronic circuits which implement the various logic operations are called
Logic gates
273 - The electrons in conduction band are free to
Transport charge
274 - The emf induced in a coil by a changing magnetic flux may have unit as
kgm2s-1A-1
275 - The emf induced in a conductor of unit length moving with unit velocity at right angles to a magnetic field is equal to
Magnetic flux density
276 - The energy band occupied by the valence electrons is called
Valence band
277 - The energy radiated is directly proportional to fourth power of Kelvins temperature is
Stephens law.
278 - The especially designed semiconductor diodes used as indicator lamps in electronic circuits are
The light emitting diode
279 - The existence of Ether wind was experimentally rejected by
infinite
280 - The force per unit charge is know as
electric intensity
281 - The graphical representation of Ohms law is
straight line
282 - The Hooke's law is valid for
Only proportional region of the stress strain curve
283 - The linear momentum of an X-ray photon of wavelength 0.1A is
6.625x1023N-s
284 - The magnetic force experienced by a charge particle moving in a magnetic field will be minimum when it moves
parallel to the field
285 - The maximum safe limit dose for persons working in nuclear power station are
5 rem per week
286 - The metallic spheres A and B of radii 2m and 4m respectively carry the same charge 4 x 10 8
If the spheres are connected by a copper wire
287 - The metastable state for an atom in laser light is
10-3 sec
288 - The minimum charge on any object cannot be less than
1.6 x 10-19C
289 - The minimum wavelength of X-rays can further be reduced by
Increasing the potential difference between the cathode and the target.
290 - The minimum wavelength of X-rays produced by the bombardment of electrons on the screen of a television set where the accelerating potential is 2.0K V will be
6.2 x 10-10m
291 - The modulus of elasticity for mild steel is approximately equal to
210 kN/mm2
292 - The moment of inertia of a body does not depend upon
The angular speed of the body
293 - The most useful tracer is
C-14
294 - The name of the photon for quantum of light was proposed by
Einstein
295 - The net charge on n-type material is
Neutral
296 - The number of electrons in one coulomb charge is equal to
6.2 x 1018
297 - The only difference between construction of D . C generator and A . C generator is that of
commutator
298 - The operation of a transistor requires
None of the above
299 - The operational amplifier is
A high gain amplifier
300 - The out put voltage of a transformer is 3 times the input voltage then turns ratio will be
3
301 - The penetrating power of X-rays depends on their
frequency
302 - The phase angle between the voltage and the current in an AC circuit consisting of a resistance is
Zero
303 - The practical illustration of the phenomenon of mutual induction is
transformer
304 - The radiations emitted form hydrogen filled discharge tube show
line spectrum
305 - The ration stress to strain in youngs modulus of the material then tension is
Directly proportional to extension.
306 - The rectangular voltage is an example of
A digital waveform
307 - The relationship between Tesla and smaller unit Gauss of magnetic induction is given by
1T = 104 G
308 - The relativistic energy E is equivalent to relativistic mass given by
E/c2
309 - The resistance of a conductor at absolute zero (OK) is
zero almost
310 - The self-inductance of a solenoid is increased when a soft iron core is inserted into it. This is because the soft iron core
Improves the flux linkage between the turns of the coil
311 - The semiconductor diode can be used as a rectifier because _
It has low resistance to the current flow when forward biased & high resistance when reverse biased.
312 - The sensitivity of a galvanometer is given by
C/BAN
313 - The simplest type of rectification known as half wave rectification is obtained by
suppressing half wave of A . C supply by using diode
314 - The sounds having a frequency of 20 Hertz to 20,000 Hertz are known as
Audible sounds
315 - The specially designed semi-conductor diodes used as fast counters in electronic circuits are
Photo diodes
316 - The standard vector symbol for flux density is
"B"
317 - The tidal waves on sea is mainly due to
Gravitational Effect of Moon on Earth
318 - The time period of a pendulum when taken to the Moon would:
Increase
319 - The uncertainty in momentum & position is due to its
Property of matter and radiation.
320 - The unit of radioactivity curie is equal to
3.70 x 1010 disintegration per sec
321 - The value of resistivity for insulator is of the order of
108 ohm metre
322 - The value of the capacitance depends upon the
geometry of the capacitor
323 - The value of the steady current which when flowing through the same resistor produces heat at the same rate as the mean rate of heat produced by the alternating current is
r.m.s current
324 - The velocity of an oscillating charge as it moves to and fro along a wire is always
changing
325 - The velocity of laser light is
Equal to ordinary light.
326 - The working of transistor as amplifier is similar to
Triode vacuum tube
327 - There are three bulbs of 60W 100W and 200W which bulb has thickest filament.
200W
328 - Thermions are
electrons
329 - Thermocouples convert
heat energy into electrical energy
330 - Three bulbs are rating 40W 60W and 100W designed to work on 220V mains. Which bulb will burn most brightly if they are connected in series across 220 V mains?
40 W bulb
331 - Three capacitors C1 C2 and C3 are connected in parallel as in the Fig. The equivalent capacitance will be
8 Degree F
332 - Three equal resistors connected in series with a source of e m f together dissipate 10 W of power each. What will be the power dissipated if the same resistors are connected in parallel across the same source of e m f?
90W
333 - Tick the correct statement
all the above statements are true
334 - Tick the correct statement
all the above
335 - Tick the correct statement
all of above
336 - Tick the correct statement
moderators slow down the neutrons
337 - Tick the only wrong statement.
an electrically neutral body is repelled both positively and negatively charged bodies
338 - Tick the right statement.
all of the above
339 - To find the r.m.s value of an alternating current mathematically we need to have
Square root of mean value of I2
340 - To obtain a p-type semi-conductor Si Crystal must be doped with foreign atoms whose valency is
3
341 - To obtain an n-type semiconductor germanium crystal it must be doped with foreign atoms whose valency is
5
342 - Total number of series in hydrogen spectrum is
five
343 - Transformer works on the principle of
Mutual induction
344 - Transuranic elements have atomic number
greater than 92
345 - Two charges are placed at a certain distance. If the magnitude of each charge is doubled the force will become
4 times of its original value
346 - Two identical coaxial circular loops carry equal currents in the same direction. If the loops approach each other the current in
Each decreases
347 - Two oppositely charged balls A and B attract third conducting ball C when placed near them turn by turn. Then ball C must be
electrically neutral
348 - Two parallel wires carrying currents in the opposite directions
repel each other
349 - Two similar charges each of one coulomb placed in air one meter apart repel each other with a force
9 x 109N
350 - UV radiation can be produced by
Electron excitation in the gas.
351 - Value of ?r for various dielectrics is always
larger than unit
352 - Various types of cancer are treated by
cobalt-60
353 - Very weak magnetic fields are detected by
Squids
354 - Visible light has a higher frequency than
Radio waves
355 - Wave-like characteristic of electron is demonstrated by
Diffraction by crystalline solids.
356 - Waves emitted from the antenna are
Electromagnetic waves
357 - Weber is the unit of
magnetic flux
358 - What happens to a liquid, when the vapour pressure equals the atmospheric pressure?
The liquid boils
359 - What is the self inductance of a coil in which an induced emf of 2V is set up when the current changes at the rate of 4 As-1?
0.5H
360 - What is the SI unit of modulus of elasticity of substance?
Nm-2
361 - What is the value of the current in a wire of 10cm long at the right angle to a uniform magnetic field of 0.5 Weber/m2 when the force acting on the wire is 5N?
100A
362 - When a body falls from an aeroplane, there is increase in its
Acceleration
363 - When a particle of charge q and mass m enters into a uniform magnetic field B moving with a velocity v perpendicular to the direction for the field it describes a circular path of radius
R=mV/qB
364 - When a pure inductor of inductance L and a pure capacitor of capacitance C are connected in parallel to a sinusoidal potential difference V the potential difference across both L & C will be
Same
365 - When an electron moving with a uniform speed in a vacuum enters a magnetic field in a direction perpendicular to the field the subsequent path of the electron is
a circle in a plane perpendicular to the field
366 - When same current passes for same time through a thick and thin wire
more heat is produced in thin wire
367 - When the coil of the galvanometer is in equilibrium then the deflecting couple is
equal to the restoring couple
368 - When the motor is at its maximum speed then back emf will be
Maximum
369 - When we excite some atoms by heat collision or electrical discharge they will
radiate electromagnetic energy of discrete characteristic wavelength
370 - When X-rays are passed through successive aluminum sheets what happens to their thickness?
it remains same
371 - Which of the following branch of Physics deal with study of Atomic Nuclei?
Nuclear Physics
372 - Which of the following has the highest entropy?
Hydrogen
373 - Which of the following never occurs singly in nature?
Force
374 - Which of the following statements is true when we see ''rainbow' ?
The Sun remains behind us and we face raindrops
375 - Which of the following substances posses the highest elasticity?
Steel
376 - Which of the following uses electric energy and does not convert it into any other form?
transformer
377 - Which of the following works on torque on the current carrying conductor placed in magnetic field.
all of the above
378 - Which of these branches of Physics deal with heat and temperature and their relation to energy and work?
Thermodynamics
379 - Which one has the greatest energy gap ?
Non metals
380 - Which one is the best material for making connecting wires?
copper
381 - Which one of following band is completely filled in case of conductors?
Conduction band
382 - Which one of following postulate is in accordance with the Rutherfords model?
continuous spectra for atoms
383 - Which one of the following bulbs has the least resistance?
300 watt
384 - Which one of the following devices does not function like an electric motor?
Transformer
385 - Which one of the following functions like a motor?
all of above
386 - Which one of the following has the greatest energy gap?
insulator
387 - Which one of the following is not a donor impurity?
aluminium
388 - Which one of the following is not an electromechanical instrument?
AC transformer and DC generator
389 - Which one of the following material is most suitable for making core of an electromagnet?
soft iron
390 - Which one of the following materials is useful for making bulb filaments?
constantan
391 - Which one of the following methods would be able to increase the sensitivity of a moving coil galvanometer ?
use spiral springs whose force constant is small
392 - Which one of the following physical quantities does not have the dimensions of force per unit area?
Strain
393 - Which one of the following radiations has the strongest photon?
?-rays
394 - Which one of the following ray has minimum wavelength?
Gamma ray
395 - While measuring the unknown resistance the help of slide wire bridge a greatest accuracy can be achieved when
the balance point is close to the middle of the wire
396 - Who enunciated the laws of planetary motion?
Johannes Kepler
397 - Why should a resistance be introduced in a circuit in series deliberately?
to decrease current
398 - With increase in temperature the electrical conductivity of intrinsic semi conductor
Increases
399 - X-ray are
high energy photons
400 - X-rays are diffracted by a crystal but not by a diffraction grating because
The wavelengths of X-rays are of the same order of magnitude as the separation between atoms in a crystal
Pages
No comments:
Post a Comment
Your Valued Comments Help us to improve our site. Thanks