1 - ________________ cells converts solar energy into electrical energy?
photovoltaic
2 - 1st law of motion gives the definition of _________________________?
force
3 - 2nd law of motion gives the definition of________________?
acceleration
4 - 3rd law of motion explains______________________?
existence of pair of forces in nature
5 - A ball rolling along the ground gradually slows down and finally comes to rest is due to ________
Friction
6 - A body is falling freely under gravity. How much distance it falls during an interval of time between 1st and 2nd seconds of its motion, taking g=10 ?
14 m
7 - A body is moving with uniform velocity. Its______________________?
displacement from origin changes
8 - 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)
9 - A completely filled band is called__________________?
Core band
10 - A current carrying conductor is placed in a uniform magnetic field parallel to it. The magnetic force experienced by the conductor is _____________________?
F/0
11 - A diffraction grating has 500 lines per mm. Its slit spacing or grating element will be equal to ____________________?
2 x 10-3 mm
12 - A ferromagnet will become fully magnetized at_________________?
Alternating current at its peak value
13 - A fuse is placed in series with the circuit to protect against__________________?
over heating
14 - A galvanometer basically is an instrument used to ____________________?
detect current in a circuit
15 - A galvanometer can be converted into a voltmeter by connecting with it a
High resistance on series
16 - A light ray traveling form rarer to denser medium suffers a phase change of__________________?
180°
17 - A magnetic compass will be deflected if it is kept near a____________________?
charge in motion
18 - A magnetic field___________________?
exerts a force if the charged particle is moving perpendicular to the magnetic field lines
19 - A man is in a car is moving with velocity of 36km/hr. His speed with repect to the car is ____________________?
zero
20 - A man jumping out of a moving train is thrown
Forward
21 - A man lifts vertically a weight of 40kg through 1m in 10s; while a chile lifts vertically a weight of 10kg through a distance of 1m in 1s. What will be correct inference ?
child does more work than man
22 - A moving coil galvanometer of resistance 100? gives half scale deflection for a current of 20mA. What will be the potential difference across it ?
2 volt
23 - 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 B
24 - A piece of paper and a cricket ball are dropped from the same height. Under which of the following conditions do both reach the surface simultaneously ?
They must be dropped in vacuum
25 - A point source of light placed in a homogeneous medium gives rise to ___________________?
a spherical wave front
26 - A potentiometer wire is 100 cm long and a constant potential difference is maintained across it. Two cells are connected in series first to support one another and then in opposite direction. The balance points are obtained at 50 cm and 10 cm from the pos
0.12638888889
27 - A rubber ball is dropped from a height of 2 metres. To what height will it rise if there is no loss of energy/velocity after rebounding ?
2 metres
28 - 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 ?
5×106 Nm-2
29 - A sensitive galvanometer gives full-scale deflection with 100 mV. If the resistance of the galvanometer is 50? the maximum current that can flow through safely is__________________?
2.0 mA
30 - A simple pendulum has a bob of mass m and its frequency is f. If we replaced the bob with a heavier one say of 2m then that will be its new frequency ?
frequency lower than 20 Hz
31 - A stationary wave is set up in the air column of a closed pipe. At the closes end of the pipe _____________________?
always an node in formed
32 - A television channel is characterised by
Frequency of transmitted signal
33 - A thing that emits its own light is___________________?
luminous
34 - A uniform steel wire of length 4m and area of cross-section 3×10-6m2 is extended by 1mm by the application of a force. If the youngs modulus of steel is 2×1011 Nm-2 the energy stored in the wire is___________________?
0.75J
35 - A vacant or partially filled band is called _____________________?
Conduction band
36 - A wheat stone bridge is said to be balanced when____________________?
potential difference across galvanometer branch is zero
37 - A wire having very high value of conductance is said to be____________________?
very good conductor
38 - A wire is stretched by a force F which causes an extension 1. The energy stored in the wire is____________________?
The extension of the wire is proportional to the force applied
39 - A wire obeys Hooks law is of length 11 when it is in equilibrium under a tension F1. Its length becomes 12 when the tension is increased to F2. The energy stored in the wire during this process is____________________?
(F1+F2) (12-11)
40 - A wire of length L is stretched by a length E when a force F is applied at one end. If the elastic limit is not exceeded the amount of energy stored in the wire is_________________?
(FE)
41 - 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
42 - 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
43 - According to Einstein light travels form one place to another in the form of ________________?
photons
44 - According to Newton sound travel in air under the conditions of_____________________?
isobaric
45 - 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
46 - An alternating current or voltage_____________________?
changes its direction again and again
47 - An ammeter measures the total current flowing through a circuit when it is connected__________________?
in series with the circuit
48 - An electric iron is marked 20 volts 500W. The units consumed by it in using if for 24 hours will be______________?
12
49 - An electromagnetic wave consists of _____________________?
Electric and magnetic fields moving perpendicular to each other
50 - An electron enters a region where the electric field E is perpendicular to the magnetic field B. It will suffer no deflection if_________________?
E = BV
51 - An immersion heater of 400 watts kept on for 5 hours will consume electrical power of __________________?
2KWh
52 - An object at rest will remain at rest and an object in motion will remain in motion until and unless it is acted upon by an external force. This is Newton's
First law
53 - Angle of friction and angle of repose are
Equal to each other
54 - Any alteration produced in shapes length or volume when a body is subjected to some external force is called____________________?
Deformation
55 - appearance of colour in thin films is due to ____________________?
interference
56 - Area under velocity time graph represent_____________________?
displacement
57 - At the center of the sun, fusion converts hydrogen into
Helium
58 - At which angle the range of the projectile is maximum____________________?
45
59 - Ball pen functions on the principle of :
Surface tension
60 - Beats are the results of____________________?
constructive and destructive interference
61 - Bending of light rays in denser medium is termed as:
Refraction
62 - Biomass can be converted into fuels by____________________?
both A and B
63 - Brightness of bulb depends on voltage or current?
Both A & B
64 - Central spot of Newtons rings __________________?
bright
65 - Circuit which gives continuously varying potential is called _______________________?
potential divider
66 - Coercive force is the force which opposes ____________________?
Demagnetization
67 - Coil of a galvanometer is suspended in a radial magnetic field so that the deflecting torque on the coil is always___________________?
BINA
68 - Conservation of energy refers to the fact that
Energy cannot be created or destroyed but can be converted from one form to another
69 - Coolis tube is used to produce
X-rays
70 - Crystals of a material can behave as_________________?
Diffraction grating
71 - Curie point is the temperature at which
A metal loses magnetic properties.
72 - Diffraction effect is____________________?
more for a sharp edge
73 - Diffraction fringes are____________________?
distance between then decreases
74 - Distance covered by a freely falling body in 2 seconds will be__________________?
19.6 m
75 - Doppler effect applies to____________________?
both sound and light waves
76 - During ________ motion of an object along a straight line, the velocity remains constant with time.
Uniform
77 - During long jump, athlete runs before taking the jump. By doing so he__________________?
increases his momentum
78 - During washing of clothes, we use indigo due to its
Proper pigmental composition
79 - Electrical energy is converted to heat at the rate of___________________?
I2R
80 - Electrical energy is measured in___________________?
kilowatt hour
81 - Electrical Pressure is also called
Voltage
82 - Electromagnetic waves are transverse in nature is evident by
Polarisation
83 - Electromagnetic waves travel in free space with the speed of___________________?
X-rays
84 - Electron microscope works on which of the following principles?
Wave Nature of electrons
85 - Energy needed to magnetize and demagnetize is represented by _________________?
Hysteresis loop area
86 - Energy of Ultraviolet rays is great than
Infrared rays
87 - Energy travels from Sun to Earth through
Radiation
88 - Fibre optics work on the principle of
Total internal reflection
89 - Flight of a rocket in the space is an example of______________________?
third law of motion
90 - For accurate scientific work, temperatures are often measured by
Platinum resistance thermometers
91 - Force of impact is the force
When the objects meet
92 - Forged documents are detected by
Ultraviolet rays
93 - Formation of large molecule by joining small molecules is_________________?
Polymerization
94 - Friction can be reduced by changing from
Sliding to Rolling
95 - Frictional force acts in
The opposite direction of the motion
96 - Fundamental frequency of stationary waves in open pipe is ______________ times the frequency in closed pipe?
Two
97 - Galvanometer is a very sensitive device with______________________?
very low damping
98 - Gamma rays have greatest similarity with
X-rays
99 - Geothermal energy is a _______________________ source of energy?
renewable
100 - Gives the definition of metre in terms of wavelength of red cadmium light ___________________?
Michelson
101 - Good conductor of electricity is
Graphite
102 - Gravitational P.E of a body has____________________?
no general formula
103 - Heat from the sun reaches earth by the process of
Radiation
104 - Heat is transmitted from higher temperature to lower temperature through the actual motion of the molecules in
Convection
105 - Heating a magnet will ____________________?
weaken it
106 - Heavy water is used in nuclear reactor to
Increase speed of neutron
107 - Holes can exist in____________________?
Semi conductors
108 - Holography is a technique of
Recording a permanent three dimensional photograph of a given single colour or a multicolour
109 - Hot water is poured simultaneously in four metallic tumblers painted outside with different points. After some time the water will be found to have cooled most in the tumbler painted.
Rough black
110 - How many laws of physics are there?
3
111 - How much heat does a 40 W bulb generates in one hour ?
144000J
112 - If 1 ampere current flows through 2m long conductor the charge flow through it in 1 hour will be_______________?
3600C
113 - If a body a mass of 2 kg is raised vertically through 2m, then the work done will be _________________?
39.2 J
114 - If a current carrying solenoid is suspended freely it will__________________?
come to rest in N-S direction
115 - If density of oxygen is 16 times that of hydrogen, what will be their corresponding ratio of velocity of sound?
0.044444444444
116 - If moon radius is 1600 km and g on its surface is 1.6 ms-2 then the escape velocity on the moon is ___________________?
50.6 ms-1
117 - If stretching force T of wire increases, then its frequency __________________?
increases
118 - If the density of atoms remain same along any direction in a crystal is called__________________?
Homogeneity
119 - If the plane of the rectangular coil is parallel to the magnetic field (i.e radial magnetic field) the torque on the coil is_____________________?
Ï„ = NIAB
120 - If velocity is doubled then__________________?
momentum increases 2 times and K.E increases 4 time
121 - In a multi range ammeter as the range increases _____________________?
shunt value decreases
122 - In a plane polarized light _________________?
vibration take place in a direction perpendicular to the direction of propagation of light
123 - In a semiconductors the charge carriers are ___________________?
Electron and holes both
124 - In a vacuum, all electromagnetic waves have the same
Velocity
125 - In an interference pattern______________________?
both dark and bright fringes are of equal width
126 - In double slit experiment if one of the two slit is covered then________________?
no interference fringes are observed
127 - In double slit experiment we observe _____________________?
both interference and diffraction fringes
128 - In heating frozen foods in sealed pouches in a microwaves, why do you first poke holes in the pouch?
To prevent the steam pressure from bursting open the pouch
129 - In liquids and gases the current is due to the motion________________?
both negative and positive charges
130 - In monochromatic red light a blue book will probably appear to be_________________?
black
131 - In open organ pipe___________________?
both even and odd harmonics are present
132 - In simple cube one atom or molecule lies at its______________________?
Eight corners
133 - In superconductors, the energy gap is due to
Electron-phonon interaction
134 - In the atmosphere ultraviolet rays are absorbed by
Oxygen
135 - In the following figure, the terminal potential is ___________________ ?
zero
136 - In the remote control of television, electromagnetic waves used are
Infrared
137 - In the shadow of a ball the central portion appears bright that happens due to_________________?
Diffraction
138 - In vibrating cord the points where the amplitude is maximum, are called ___________________?
antinodes
139 - In Young double slit experiment, if white light is used____________________?
coloured fringes will be seen
140 - Increase in velocity of sound in the air for 1°C rise in temperature is_________________?
0.61 ms-1
141 - Inertia of an object is quantitative measure of its__________________?
mass
142 - Instantaneous and average velocities become equal when body___________________?
has zero acceleration
143 - Instruments for measuring Solar Radiation?
Pyranometer
144 - Intensity of any wave is proportional to which of the following?
Square of amplitude
145 - Internal resistance is the resistance offered by________________?
source of EMF
146 - It is more difficult to walk on ice than on a concrete road because
There is very little friction between the ice and feet pressing it
147 - It is possible to distinguish between transverse and longitudinal waves form the property of __________________?
polarization
148 - Laplace found that the alternate compressions and rarefactions produced in sound waves follows ________________?
adiabatic law
149 - Let a thin capillary tube be replaced with another tube of insufficient length then, we find water
will not rise
150 - Light on passing through a Polaroid is ___________________?
plane polarized
151 - Light reaches the earth form sun in nearly____________________?
8 minutes 30 seconds
152 - Lightning is produced when
Strong opposite charges in different clouds break down the resistance offered by the intervening air
153 - linear expansion occurs in_________?
solid
154 - Longitudinal waves do not exhibit _____________________?
polarization
155 - Lux is the SI unit of
Intensity of illumination
156 - Magnetic flux and flux density are related by___________________?
magnetic flux = flux density x area
157 - Magnetic force acting on a unit positive charge moving perpendicular to the magnetic field with a unit velocity is called____________________?
magnetic induction
158 - Magnetic keepers are pieces of
Soft iron
159 - Magnetism in materials is due to
Circular motion of electrons
160 - Many of the semi conductors are crystals of the type__________________?
Face centred cubic
161 - Materials in which valence electrons are tightly bound to their atoms at low temperature are called___________________?
Insulators
162 - Materials that undergo plastic deformation before breaking are called __________________?
Ductile
163 - Materials that usually are good conductors of electricity?
Aluminium
164 - Matter waves are
De Broglie waves
165 - Metals are good conductors of electricity because:
They contain free electrons.
166 - Minimum current required to produce a deflection of 1 mm on a scale at a distance of 1 meter is__________________?
current sensitivity
167 - Momentum depends upon__________________?
both mass and velocity of the body
168 - Momentum is measured as the product of :
Mass and velocity
169 - Motorcycle safety helmet extends the time of collision hence decreasing the________________?
impulse
170 - Name the branch of science which deals with the study of sound and sound waves?
Acoustics
171 - Newton estimated the speed of sound _____________________?
281m/sec
172 - Newtons laws do not hold good for particles_______________?
move with velocity comparable to velocity of light
173 - Ocean currents are an example of
Convection
174 - On loading the prong of a tuning form with wax its frequency____________________?
decreases
175 - 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
176 - On which day 'National Science Day' is celebrated in India ?
44620
177 - One can distinguish a telescope from a microscope by observing
Length and size of the lens
178 - One kilowatt hour is the amount of energy delivered during _______________?
one hour
179 - One mega watt hour is equal to_________________?
36 x 108 J
180 - Optical active crystals rotates the __________________?
polarization plane
181 - Optical fiber works on the principle of
Total internal reflection
182 - Ozone layer in the outer atmosphere helps us in
Absorbing UV radiations
183 - Pa(Pascal) is the unit for
Pressure
184 - Photoelectric effect was given by ____________________?
Einstein
185 - Physics is one of the branches of___________?
Physical sciences
186 - Pieces of camphor placed on water move about rapidly. This is because of
Surface tension
187 - Planets do not twinkle because
They are nearer to earth and hence we receive a greater amount of light.
188 - Positive feedback is used in
Oscillators
189 - Production of heat due to an electric current flowing through a conductor is given by _________________?
Joule effect
190 - Propulsion force of a rocket is____________________?
non-conservative force
191 - Proton electron neutron and a particles have same momentum. Which of them have highest K.E ?
electron
192 - Radiocarbon is produced in the atmosphere as a result of
Collision between fast neutrons and nitrogen nuclei present in the atmosphere
193 - Rainbows are produced when sunlight :
Incident on rain drops hanging in the atmosphere is dispersed after suffering refraction and internal reflection.
194 - Reciprocal of resistivity is called__________________?
conductivity
195 - Red light is used for signals because it has
Long wavelength
196 - Refractive Index of glass with respect to water is
44812
197 - Resistance of a conductor depends upon_________________?
all of above
198 - Resistance of a super conductor is ______________________?
zero
199 - Resistance of a wire on increasing its temperature will_________________?
increase with rise in temperature
200 - Resistance of an ideal insulator is __________________?
infinite
201 - SI unit of flux density is____________________?
NA-1m-1
202 - Silence zone takes place due to____________________?
destructive interference
203 - Slope of velocity time graph is_____________________?
acceleration
204 - Sound waves do not travel in vacuum because ___________________?
they require material medium for propagation
205 - Specific resistance of a wire____________________?
will depend on the type of material of the wire
206 - Stars appears to move from east to west because
The earth rotates from west to east
207 - Study of living science relates with________?
Biological science
208 - Suppose voltage V is applied across a resistance R. The power dissipated in the resistance is P. Now the same voltage V is applied across a parallel combination of three equal resistors each of resistance R. Then the power dissipated in the second case wi
3P
209 - Taking off rocket can be explained by __________________?
Law of conservation of momentum
210 - Tesla is a unit of magnetic :
Field
211 - The acceleration in the rocket at any instant is proportional to the nth power of the velocity of the expelled gases. Where the value of n must be ?
1
212 - The angular position of cells remains the same for a sample of a crystal. This property is called___________________?
The external symmetry of form
213 - The area under the force displacement graph represents__________________?
work done
214 - The average power and instantaneous power become equal if work is done at __________________?
at uniform rate
215 - The band theory of solids explains satisfactorily the nature of_________________?
All of the above
216 - The basic reason for the extraordinary sparkle of suitably cut diamond is that
It has a very high refractive index
217 - The beats frequency (sensible) for a human car is _____________________?
7 Hz
218 - The blue colour of the sky is due to___________________?
scattering
219 - The Branch of Physics deals with highly energetic ions is called__________?
Plasma physics
220 - The branch of Physics which deals with properties of gravitational?
Field theory
221 - The branch of physics which deals with the living things is called_________?
biological sciences
222 - The branch of science which deals with the properties of matter and energy is called__________?
Physics
223 - The breaking of crystals along definite direction is called _____________________?
Cleavage
224 - The bulk properties of materials such as their mode of fracture can be related to their____________________?
Microstructure
225 - 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
226 - The collision between two bodies be elastic if bodies are_________________?
solid and hard
227 - The combined gas law relates which of the following?
Volume, Temperature & Pressure
228 - The consumption of energy by a 60 watt bulb in 2 sec is_________________?
120 J
229 - The cooling by a desert Cooler is based on:
Evaporative Cooling
230 - The curie temperature is that at which ____________________?
Ferromagnetic becomes paramagnetic
231 - The current through a metallic conductor is due to the motion of _________________?
free electrons
232 - The deflection for 50 division of galvanometer is decreased to 25 divisions by shunt resistance of 12Ω. Galvanometer resistance is_____________?
12Ω
233 - The dimension of elastic modulus is ___________________ ?
ML-1T-2
234 - The dimension of force is____________________?
MLT-2
235 - The distance between any two consecutive crests or troughs is called____________________?
Wave length
236 - The distance covered by a body in time t starting from rest is__________________?
at2/2
237 - The effective way to increase the sensitivity of a moving coil galvanometer is to___________________?
use a very strong magnetic field
238 - The electrons in conduction band are free to___________________?
Transport charge
239 - The energy band occupied by the valence electrons is called___________________?
Valence band
240 - The escape velocity form the earth surface in km S-1 is____________________?
1.1 km S-1
241 - The escape velocity of a body in gravitational field of earth is independent of__________________?
both its mass and the angle at which it is thrown
242 - The first book of Physics was written by__________?
Aristotle
243 - The flux commonly used in brazing is
Borax
244 - The force beared by a wall on which water strikes normally at a speed of 10m/sec and at a discharge of 0.0001m3/sec is__________________?
1 N
245 - The force which makes a vehicle to stop when break is applied is called
Frictional force
246 - The formula of inter-conversion of centigrade and Fahrenheit scale is___________?
f -32/9 =c/5
247 - The graphical representation of Ohms law is___________________?
straight line
248 - The hair of shaving brush clings together when removed from water due to
Surface tension
249 - The highest value of escape velocity in solar system is planet____________________?
Jupiter
250 - The locus of all points in a medium having the same phase of vibration is called____________________?
wave front
251 - The magnetic field strength of solenoid is__________________?
Both B and C
252 - The metal used to make lightning conductors is
Copper
253 - The method of magnetisation is:
Hammering a magnet
254 - The modulus of rigidity is the ratio of
Shearing stress to shearing strain
255 - The most fundamental of all sciences which provides basic principles and fundamental laws to other branches of science is_________?
physics
256 - The net charge on n-type material is____________________?
Neutral
257 - The normal ear is the most sensitive in the frequency range___________________?
2000 to 4000 hertz
258 - The number of beats produced per second is equal to____________________?
the difference of the frequencies of two tuning forks
259 - The periodic alternation of sound between maximum and minimum loudness are called___________________?
beats
260 - The physics of moving charge particles is known as__________?
Electro-dynamics
261 - The primary agent of contact metamorphism is
Temperature
262 - The radiation initially produced in fluorescent tube is
Ultraviolet
263 - The range of the projectile at 30 deg and 60 deg are__________________?
equal to each other
264 - The ration stress to strain in youngs modulus of the material then tension is__________________?
Directly proportional to extension
265 - The redness in atmosphere at Sunrise and Sunset is due to :
Scattering of light
266 - The relation between the escape velocity V esc and orbital speed Vo is given by________________?
V esc = -2 Vo
267 - The relationship between Tesla and smaller unit Gauss of magnetic induction is given by_________________?
1T = 104 G
268 - The resistance of a conductor at absolute zero (OK) is________________?
zero almost
269 - The resistance of a conductor is inversely proportional to its:
Area of cross section
270 - The sensitivity of a galvanometer is given by__________________?
C/BAN
271 - The SI unit of Heat is________?
Joule
272 - The sky appears blue because
The atmosphere scatters blue colour more than the others
273 - The sky appears blue due to
Rayleigh scattering
274 - The slope of a velocity-time graph represents
Acceleration
275 - The source of geothermal energy is___________________?
all as said in A – B and C
276 - The speed of sound in hydrogen is _____________ time than that in oxygen?
Four time
277 - The speed of stationary waves in a stretched string are independent of___________________?
both A and C
278 - The standard vector symbol for flux density is ____________________?
L
279 - The term ''Higgs Boson' is associated with
God Particle
280 - The thrust on the rocket in the absence of gravitational force of attraction is__________________?
Constant
281 - The tides raise the mater in the see roughly in a day___________________?
twice
282 - The trajectory (or path) of a projectile is_________________?
parabola
283 - The unit of coefficient of linear expansion or volume expansion is__________?
K-1
284 - The velocity of light was determined accurately by_______________?
Michelson
285 - The velocity of sound in air would become double than its velocity at 0°C at temperature ?
819°C
286 - The velocity of sound in air would become double than its velocity at 0°C at temperature________________?
819°C
287 - The velocity of sound is greatest in___________________?
copper
288 - The wave theory of light can explain
Interference of light
289 - The waves that require a material medium for their propagation are called__________________?
mechanical waves
290 - The waves used in sonography are
Ultrasonic waves
291 - The work done by friction is__________________?
negative
292 - The__________branch of Physics deals with nuclear particles such as neutrons, protons and nuclear?
Nuclear Physics
293 - There are three bulbs of 60W 100W and 200W which bulb has thickest filament ?
200W
294 - Thermocouples convert___________________?
heat energy into electrical energy
295 - 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
296 - 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
297 - Time rate of change of momentum is equal to____________________?
force
298 - Two automobiles are 150 kilometers apart and traveling toward each other. One automobile is moving at 60km/h and the other is moving at 40km/h mph. In how many hours will they meet?
1.5
299 - Two parallel wires carrying currents in the opposite directions____________________?
repel each other
300 - Two sources of light are coherent if they emit rays of_______________?
same wave length with constant phase difference
301 - Two stones of different masses are dropped simultaneously from the top of a building
Both the stones reach the ground at the same time
302 - Ultra violet radiations of the Sun do not reach the earth because, earth's atmosphere is surrounded by
Ozone
303 - Ultrasonic have__________________?
frequency is greater than 20 kHz
304 - Value of permeability of free space in SI units is___________________?
4x10-7 WbA-1m-1
305 - Velocity of sound in vacuum is ____________________?
Zero
306 - Very weak magnetic fields are detected by___________________?
Squids
307 - Water cannot be used to extinguish fire caused by electric current, because
It may cause electrocution
308 - Wavelength of X-rays falling at glancing angle of 30? on a crystal with atmic spacing 2 x 10-10 for the fist order diffraction is________________?
2 x 10-10 m
309 - Waves produced at the surface of water by a pencil executing vibrating motion if held vertically at a frequency of 50Hz are__________________?
both A and C
310 - Waves that are required for long distance wireless communication are
Radio waves
311 - Waves transmit ________________ from one place to another?
energy
312 - Weight of a body is maximum at the:
Pole
313 - What are the dimensions of stress ?
ML-1T-2
314 - What are the particles emitted by radioactive element after 3 consecutive disintegration?
2 beta 1 alpha
315 - What does the slope of a velocity time graph represent?
Acceleration
316 - What is a compound microscope?
A microscope that has two sets of lenses : an occular lens and an eyepiece.
317 - What is colour of light related to ?
Amplitude
318 - What is found in frequency modulation ?
Fixed frequency
319 - What is the angle of projection for which the range and maximum height become equal ?
tan-1 4
320 - What is the effective resistance (in Ω) of two resistors 20 Ω and 30 Ω connected in parallel?
12
321 - What is the reason for twinkling of stars ?
Atmospheric refraction
322 - What is the shape of velocity, time graph for constant acceleration ?
straight inclined line.
323 - What is the SI unit of modulus of elasticity of substance ?
Nm-2
324 - 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
325 - What is unit of Astronomical distance ?
Light year
326 - What is unit of Viscosity ?
Newton second per square meter
327 - What type of heat transfer is boiling water?
Convection
328 - When a body is accelerated, then the velocity will be also
Increase
329 - When a body moves in a straight line then its displacement coincides with__________________?
distance
330 - When a detergent is added to pure water, its surface tension
Decreases
331 - When a force is applied at one end of an elastic wire it produces at strain ∠in the wire. If y is the youngs modulus of the material of the wire the amount of energy stored per unit volume of the wire is given by_________________?
Yâˆ2
332 - When a force is parallel to the direction of motion of the body, then work done on the body is_____________________?
maximum
333 - 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
334 - 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
335 - When arrow is released form its bow, its energy is transformed from _____________________?
elastic P.E to K.E
336 - When body is in motion, ____________ always changes?
its position vector
337 - When car takes turn around a curve road, the passengers feel a force acting on them in a direction away from the center of the curve. It is due to__________________?
Centrifugal force
338 - When collision between the bodies in a system is inelastic in nature then for system ____________________?
K.E changes but momentum remain conserve
339 - When crest of one wave falls over the trough of the other wave this phenomenon is known as________________?
destructive interference
340 - When does land breeze occur?
Both A & B
341 - When light incident normally on thin film the path difference depends upon ________________?
all thickness nature and angle of incidence
342 - When one mirror of a Michelson Interferometer is moved a distance of 0.5 mm we observe 2000 fringes. What will be wavelength of light used ?
5000A
343 - When same current passes for same time through a thick and thin wire_________________?
more heat is produced in thin wire
344 - When the coil of the galvanometer is in equilibrium then the deflecting couple is____________________?
equal to the restoring couple
345 - When the source of sound moves away form a stationary listener then ______________ occurs?
an apparent decrease in frequency
346 - When the speed of a moving body is doubled then___________________?
its momentum is doubled
347 - When two bodies move toward each other with constant speeds the distance between them decreases at the rate of 6m / sec. If they move in the same direction the distance between them increases at the rate of 4m/sec. Then their speeds are________________?
5m/s, 1m/s
348 - When two ice cubes are pressed together, they join to form one cube. Which one of the following helps to hold them together?
Hydrogen bond formation
349 - When two identical traveling waves are superimposed, the velocity of the resultant wave__________________?
remains unchanged
350 - When two protons are brought together_____________________?
P.E. between them increases
351 - When velocity time graph is a straight line parallel to time axis then__________________?
acceleration is zero
352 - Which best describes how air moves during convection?
Cool air falls down
353 - Which branch of science plays an important role in engineering?
Physics
354 - Which experiment shows that wavelength of light is smaller than that of sound___________________?
Diffraction
355 - Which is not optically active ?
water
356 - Which law of motion is also called law of inertia ?
1st law
357 - Which of the following are used for accurately measuring very small time intervals ?
Atomic clocks
358 - Which of the following causes adiabatic temperature changes in atmosphere?
Expansion and compression of the air
359 - Which of the following colour of light deviates least through the prism?
Red
360 - Which of the following criterion is used for any metal to be used as a cooking material ?
Less thermal conductivity
361 - Which of the following is not an example of projectile motion ?
a gas filled ballon
362 - Which of the following is not conservative force_________________?
friction
363 - Which of the following is optical illusion?
Mirage
364 - Which of the following is the unit of Astronomical Distance ?
Metre/sec
365 - Which of the following options correctly explains the term heat budget?
It is the balance between incoming and outgoing radiation
366 - Which of the following pair has same direction always ?
force, acceleration
367 - Which of the following parts of the sunlight makes the solar cooker hot ?
Infra red
368 - Which of the following substances posses the highest elasticity ?
Steel
369 - Which one among the following is not an electromagnetic wave?
Cathode Ray
370 - Which one has the greatest energy gap ?
Non metals
371 - Which one is the best material for making connecting wires ?
copper
372 - Which one is the correct relation for fundamental frequency of open and closed pipe ?
fopen = 2 fclosed
373 - Which one of the following bulbs has the least resistance ?
300 watt
374 - Which one of the following cannot be polarized ?
sound waves
375 - Which one of the following is an ohmic conductor?
Silver
376 - Which one of the following is massless? 2
Photon
377 - Which one of the following is nearly monochromatic light ?
light form sodium lamp
378 - Which one of the following is not a feature of Indifference Curve?
They are concave to each other
379 - Which one of the following is not an electromechanical instrument ?
AC transformer and DC generator
380 - Which one of the following material is most suitable for making core of an electromagnet ?
soft iron
381 - Which one of the following materials is useful for making bulb filaments ?
tungsten
382 - Which one of the following physical quantities does not have the dimensions of force per unit area ?
Strain
383 - Which one of the following properties of light does not change with the nature of the medium ?
frequency
384 - Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?
It follows the wave path near the tropopause at elevations of 8 km to 15 km.
385 - Which one type of radiation has the longest wave length
Radio Wave
386 - Which phenomena can be applied to estimate the velocity of star with respect to earth ___________________?
Dopplers effect
387 - Which physicists is the writer of the book 'A Brief History of Time'?
Stephen Hawking
388 - Which shows the correct relation between time of flight T and maximum height H ?
H=gT2/8
389 - While ascending a hill, the driver of the vehicle keeps the gear ratio
Either equal to or greater than 1
390 - While catching a ball, a player pulls down his hands to lower the–
Momentum
391 - 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
392 - Who among the following discovered X-rays?
W.C Roentgen
393 - Why Ballistic missile fails in some circumstances of precision ?
due to air resistance
394 - Why does the sea appear blue in colour?
Scattering of the sunlight by water molecules
395 - Why should a resistance be introduced in a circuit in series deliberately ?
to decrease current
396 - With increase in temperature the electrical conductivity of intrinsic semi conductor___________________?
Increases
397 - Work done by the force of friction is____________________?
always negative
398 - Work done by variable force is determine by dividing____________________?
displacement into small interval
399 - Work done on the body equals to the _____________________?
change in its K.E and change in its P.E
400 - Work has the dimension as that of same as that of__________________?
torque
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