1 - ________ states that internal energy is a function of state and the increase in internal energy is equal to the sum of the heat supplied to system and work done by the system.
First law of thermodynamics
2 - . . . . . . . . . exerts a force on anything that has an electric charge.
Electric field
3 - 1 WH =
3600 joules
4 - A balloon filled with hydrogen will
Reach a particular height and remain floating
5 - A black body can absorb radiations of :
All wavelengths
6 - A boat loaded with rocks floats in the middle of a swimming pool. A man in the boat throws the rocks overboard. The level of water in the pool will
Decrease
7 - A body absorbs heat most if it is
Black and rough
8 - A body of 4.0 kg is lying at rest. Under the action of a constant force, it gains a speed of 5 m/s. The work done by the force will be ________
50 J
9 - A body of mass 2 kg is thrown upward with initial velocity of 20 m/s. After 2 seconds, its kinetic energy will be : (g = 10 m/s2)
0 J
10 - A body of mass 5 kg accelerates from 12 m/s to 20 m/s in 4 seconds due to the application of a force on it. Calculate the magnitude of this force (in N).
10
11 - A boy sitting in an open car moving with the constant speed throws a ball straight up into the air. The ball falls
Behind him
12 - A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by
Decreasing the radius of the capillary tube
13 - A car accelerates uniformly from 18 kmph to 72 kmph in 5 s. The acceleration of the car (in m/s2) is:
3
14 - A convex mirror of focal length f (in air) is immersed in a liquid (u=4/3). The focal length of the mirror in the liquid will be :
F
15 - A device which is used to limit the current in an electrical circuit is called a
Fuse
16 - A dynamometer wattmeter can be used for
Both A & B
17 - A fresh egg when placed in salt water will
Float
18 - A galvanometer can be converted to a voltmeter by connecting
A high resistance in series
19 - A liquid disturbed by stirring comes to rest due to
Viscosity
20 - A man standing at the top of a tower has two spheres A and B. He drops sphere A downwards and throws sphere B horizontally at the same time. Which of the following is correct ?
Both the spheres will reach the ground simultaneously.
21 - A man standing on a edge of a cliff throws a stone vertically upwards with a certain speed. He then throws another stone downwards with the same speed. Find the ratio of the speeds of the two stones when they hit the ground.
0.042361111111
22 - A manometer is used to measure
Pressure
23 - A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the body is: [Given g = 9.8 m/s2]
1568 J
24 - A metal ball and a rubber ball, both having the same mass, strike a wall normally with the same velocity. The rubber ball rebounds and the metal ball does not rebound. It can be concluded that
The rubber ball suffers greater change in momentum
25 - A mirage occurs because of
Total internal reflection by layers of air
26 - A multimeter is used to measure
All of the above
27 - A nuclear reactor is said to have become 'critical' when
It is ready to produce controlled energy
28 - A parachute descends slowly whereas a stone dropped from the same height falls rapidly, because
A parachute has a larger surface area and air resistance is more
29 - A parallel-plate capacitor of capacitance C1 is made using two gold plates. Another parallel-plate capacitor of capacitance C2 is made using two aluminium plates with same plate separation, and all the four plates are of same area. If rg and ra are respec
C1 = C2
30 - A parallel-plate capacitor,with air in between the plates, has capacitance C. Now the space between the two plates of the capacitor is filled with a dielectric of dielectric constant 7. Then the value of the capacitance will become
7C
31 - A periscope works by the principle of
Total internal reflection
32 - A periscope works on the principle of
Total internal reflection
33 - A person does some work of 1,000 J in 2 s. His power will be ________
500W
34 - A photostat machine works on
Electrostatic image making
35 - A piece of ice is floating in water kept in a beaker. When all the ice melts the level of water will
Remain the same
36 - A pond of water appears less deep due to
Refraction
37 - A radioactive substance does not undergo any change (in mass or charge) during
Gamma-emission
38 - A real gas can act as an ideal gas in
Low pressure and high temperature
39 - A simple microscope consists of :
A short focus convex lens
40 - A small piece of a substance is weakly attracted by a strong magnetic field. The substance is
Paramagnetic
41 - A solid needle placed horizontally on the surface of the water floats due to
Surface tension of water
42 - A standing wave occurs when
A wave reflects upon itself
43 - A storm is predicted if atmospheric pressure
Falls suddenly
44 - A thin oil film on a water surface appears coloured because of
Interference
45 - A wave with high amplitude have
High energy
46 - According to the Second Law of Motion, for a given force, acceleration is inversely proportional to the ________ of an object.
Mass
47 - Addition of suitable impurities into semiconductor, is called
Doping
48 - After reflection from a plane mirror the word will look like.
ECNALUBMA
49 - After removing two electrons from helium atom it become?
Alpha particle
50 - Air moves from the region where the air ________
Pressure is high to the region where the pressure is low
51 - Alcohol is more volatile than water because ________ is lower than water.
Its boiling point
52 - Alternating current is converted into direct current by a
Rectifier
53 - Amount of water vapour (gaseous) in a given volume of air (cubic metre) is known as:
Absolute humidity
54 - An athlete runs before long jump to get advantage on
Inertia of motion
55 - An atom bomb based upon the principle of ________
Nuclear fission
56 - An ice block with a piece of lead embeded in it floats in water. If ice melts the water level
Falls
57 - An image formed by a plane mirror, that cannot be obtained on a screen is called ________
Virtual image
58 - An instrument that records earthquakes is
Seismograph
59 - An integrated circuit is more advantages than a coventional circuit because
All the above
60 - An object covers distance which is directly proportional to the square of the time. Its accelaration is
Constant
61 - An object of 10 kg is moving with a speed of 2 m/s. The kinetic energy of the object is
20 J
62 - An object that has kinetic energy must be
Moving
63 - An optically plane surface reflects a beam of light
As a parallel beam in one direction
64 - Anemometer is used to measure
Wind velocity
65 - As we go from Equator to North pole the value of ''g', the acceleration due to gravity
Increases
66 - At the Curie temperature, the ferromagnetic materials get converted into
Paramagnetic materials
67 - Ball bearings are used in cycles, scooters etc to
Reduce the friction between the wheel and the axle
68 - Buoyancy depends on
The mass of the liquid displaced
69 - Burns caused by steam are much severe than those caused by boiling water because
Steam has latent heat
70 - Certain substances loose their electrical resistance completely at super low temperature. Such substances are called.
Superconductors
71 - Charles's law is based on
Gas
72 - Choose the most appropriate answer: Sir CV Raman was awarded Noble Prize for his work connected with which of the following phenomenon of radiation?
Scattering
73 - Circuit breaker usually operate under
Transient state of short-circuit current
74 - Clouds float in the atmosphere because of their
Low density
75 - Cloudy nights are warmer compared to clear cloudless nights, because clouds mainly
Reflect back the heat given by earth
76 - Convex mirror is generally used in ________
Rear view mirror
77 - Convex mirrors are used as a rear view mirror in motor cycles because
It forms smaller image as compared with object
78 - During the motion of a projectile fired from the earth surface, ________
Horizontal component of its velocity remains constant
79 - Eddy current is generated by
Induction
80 - Energy in reflected light :
Increases with the increase in angle
81 - Erg cross Sec is the unit of
Planck's constant
82 - Even after sunset, the air near the Earth's surface continue to receive heat due to
Terrestrial Radiation
83 - Fiber optics cable used in communication, works on the principle of
Total internal reflection of light
84 - Flywheel is an important part of a steam engine because it :
Helps the engine in keeping the speed uniform
85 - Fog is an example of
Liquid dispersed in gas
86 - For a body moving with non-uniform velocity and uniform acceleration
Displacement – Time graph is non-linear
87 - For a body moving with uniform acceleration its final velocity equals ________
2 x average velocity - initial velocity
88 - For a freely falling body, the sum of kinetic energy and potential energy is always
Same
89 - For Gamma radiation, what stops its penetrating abilities?
All of the above
90 - For which of the following substances, the resistance decreases with increase in temperature?
Nichrome
91 - Formation of shadows can be explained by
Rectilinear propagation of light
92 - Friction is caused by the ________ on the two surfaces in contact.
Irregularities
93 - Full form of CFL used in place of electric bulbs is
Compact fluorescent lamp
94 - Gamma rays are emissions that have
Neither mass nor charge
95 - General purpose utility gloves are
For cleaning procedures
96 - Gravitational force is maximum at which place
Poles
97 - Heat flows as a result of difference of ________
Temperature
98 - Heat from the Sun reaches the Earth by
Radiation
99 - Heat stored in water vapour is
Latent heat
100 - Heat transfer by conduction occurs when molecules
Collide
101 - Hertz is the SI unit of
Frequency
102 - Hydraulic brakes in automobile work on
Pascal's principle
103 - Hydraulic brakes work on the principle of
Pascal's law
104 - Hydraulic machines work under the Principle of :
Pascal's Law
105 - Hydroscope is an instrument that shows changes in:
None of these
106 - If a copper wire is increased to double its length, its resistance will become
Four times
107 - If an ordinary glass tube and a glass capillary tube are both dipped in a beaker of water, water rises in
Both
108 - If both the mass and the velocity of a body is increased to twice of their magnitude, the kinetic energy will increase by
8 times
109 - If objects appear enlarged and inverted in a rear view mirror, then which type of mirror is used?
Concave
110 - If the current flowing through a circuit is 0.6 A for 6 mins, the amount of electric charge flowing through it is ________
216 C
111 - If the phase difference between two points is 120° for a wave with velocity of 360 m/s and frequency 500 Hz, then path difference between the two points is
24 cm
112 - If the velocity of a body is halved its kinetic energy ________
Becomes 1/4 th
113 - If there is a circular hole in a metal plate, what happens to the radius of the hole when the plate is heated?
Increases
114 - If you look into a mirror and find that the image (your reflection) is smaller than you, then the type of the mirror is:
Convex mirror
115 - In ________ motion of a body its velocity varies with time.
Non-uniform
116 - In a ________ the wave particles of the medium vibrate in a direction perpendicular to the direction of wave propagation
Transverse
117 - In a bipolar junction transistor
The base has the least concentration of impurity
118 - In a Carnot engine when heat is taken from the source, its temperature
Remains constant
119 - In a Cinema hall, the distance between the projector and the screen is increased by 2%. Then the intensity of illumination on the screen is
Decreased by 4%
120 - In a conductor
The valence band and the conduction band overlap each other
121 - In a water lifting electric pump, we convert
Electrical energy into Potential energy
122 - In an optical fibre the signal is transmitted
Due to total internal reflection
123 - In SONAR which kind of wave is used?
Ultrasonic
124 - In spherical polar coordinates (l, q, a), q denotes the polar angle around z-axis and a denotes the azimuthal angle raised from x-axis . Then the y-component of P is given by
Psinq sina
125 - In the case of bodies falling under gravity which of the following remains constant at a given place?
Acceleration
126 - In the gamma decay of a nucleus
Neither the mass number nor the atomic number of the nucleus changes
127 - In the process of magnetisation of a bar
The entire bulk of the bar gets magnetised
128 - In total internal reflection, the light travel from
Denser to rarer medium and it occurs with no loss of intensity
129 - In uniform circular motion, the linear velocity is perpendicular to
Radius vector
130 - In which of the following cases, kinetic energy is being used in performing work ?
Driving a car to cover a distance
131 - In which one of the following the phenomenon of total internal reflection of light is used ?
Formation of mirage
132 - Indicate the false statement about the resistance of a wire
It is directly proportional to the area of cross-section of wire
133 - Instrument for measuring blueness of the sky or ocean is called ________
Cyanometer
134 - Intensity of gravitational field of earth is maximum at
Poles
135 - Intensity of sound has
an object existence
136 - Isotopes of an element contain
the same number of protons but different number of neutrons
137 - It is dangerous to observe Solar eclipse with naked eyes because
Ultraviolet radiations from Sun burn our retina
138 - It is difficult to cook rice
At the top of a mountain
139 - It is easier to roll a barrel full of coal tar than to pull it because
the rolling friction is much less than the sliding friction
140 - It is easy to burst a gas-filled balloon with a needle than with a nail. It is because
Needle exerts more pressure than nail on the balloon.
141 - Kinetic energy depends on
Both mass and velocity of the moving body
142 - Kirchoff's Voltage Law is known as
Conservation Energy
143 - Light beam which is highly directional is called:
Laser
144 - Light houses are places with powerful lights to :
Guide and warn the ships coming from different directions in the ocean
145 - Light scattering takes place in
Colloidal solutions
146 - Light travels fastest in
Air
147 - Light travels in a straight line (rectilinear propagation of light). This statement does hold if the medium of travel for light is
Homogeneous and transparent
148 - Light travels slowest in
Glass
149 - Lightning heats the surrounding air to
30000 deg Cent
150 - Mach number is used in connection with the speed of
aircraft
151 - Magnetic domains normally occur in
Iron
152 - Materials that allow electricity to flow are called
Conductors
153 - Mica is used in electrical appliances such as electric iron because mica is
a good conductor of heat but a bad conductor of electricity
154 - Minimum number of unequal vectors which can give zero resultant are
three
155 - ML2T-2 is the dimensional formula for
couple acting on a body
156 - Natural radioactivity was discovered by
Henri Becquerel
157 - Night photography and photopraphy in mist and fog are possible using
Infra-red radiation
158 - Nuclear Reactors are based on which of the following phenomenon?
Controlled Nuclear Fission
159 - Nuclear reactors used to produce electricity are based on
Nuclear fission
160 - Oil rises up the wick in a lamp because
Of the capillary action phenomenon
161 - On a stationary sail boat, air is blown from a fan attached to the boat. The boat
does not move
162 - On which of the following techniques photostate machine works ?
Electrostatic Image—Making
163 - On which principle does the hydraulic lift works?
Pascal's law
164 - One bar is equal to
105 Pa
165 - One light year is equal to
6 trillion miles
166 - One nanometer is equal to ________ meters.
10 raised to the power (-9)
167 - One nanometer is equal to:
10-9m
168 - Optic fibres are used in :
Endoscopy
169 - Optical fibres are based on the phenomenon of
Total Internal Reflection
170 - Parabolic mirrors are used in
Car headlights
171 - Parsec is the unit of
Distance
172 - Person who is colourblind cannot distinguish between
Red and green
173 - Photosynthesis takes place faster in
White light
174 - Planets are
non-luminous heavenly bodies
175 - Pressure Cooker cooks faster because
Higher temperature is attained for cooking
176 - Purity of a metal can be determined with the help of
Archimedes principle
177 - Purpose of an optical filter is to
Transmit or absorb light of different colours
178 - Quality of transmission depends upon
Both (A) and (B)
179 - RADAR is used for
Detecting and locating the position of objects such as Aeroplanes
180 - Radioactive elements can be traced out in living cell through a technique called
Auto radiography
181 - Radioactivity is due to
Unstable nucleus
182 - Rain is falling vertically downwards. To a man running east-wards, the rain will appear to be coming from
east
183 - Rainbow is due to
refraction and reflection of sunlight by water droplets
184 - Rainbow is produced when sunlight fall on drops of rain. Which of the following physical phenomena are responsible for this? I.Diffusion II.Refraction III.Internal reflection
II and III
185 - Rainbow is seen after rain because of hanging molecules of water which act as
Mirrors
186 - Rate of change of displacement is known as ________
Velocity
187 - Rate of change of momentum is
Force
188 - Rear view mirror of car is convex or concave?
Convex
189 - Rolling friction is caused by ________
Non-elastic effects
190 - Scalar Quantities are
Physical quantities which have magnitude only and no direction
191 - Shaving mirror is
Concave
192 - Shock-absorbers are usually made of steel as it :
Has higher elasticity
193 - Should cars have bumpers that collapse under impact?
Yes, since they help to absorb the impact of a collision and keep the occupants safe
194 - Sir C.V. Raman was awarded Nobel Prize for his work connected with which of the following phenomenon of radiation?
Scattering
195 - Skids occur when the brakes are applied so hard that the front or rear wheels lose traction are called as
Braking
196 - Solar eclipse will take place when
the moon is between the sun and the earth
197 - Solar energy is converted into chemical energy during
Photosynthesis
198 - Solar energy is due to
Fusion reactions
199 - Sound cannot pass through
Vacuum
200 - Sound travels fastest in
Glass
201 - Sound waves cannot travel in
Vacuum
202 - Sound waves cannot travel through
Vacuum
203 - Speed in a given direction is called
Velocity
204 - Speed of light is maximum in ________
Vacuum
205 - Speed of sound in air is unaffected by change in
Pressure
206 - Stars which appear single to the naked eye but are double when seen through a telescope are
binaries
207 - Stress can be defined as ________ quantity.
Tensor
208 - Super conductors are substances that
Offer minimum resistance to flow of electric current
209 - Supersonic plane fly with the speed
greater than the speed of sound
210 - Surface tension in a liquid is due to :
Cohesive force between molecules
211 - Tape recorder should not be kept near one of the following things :
Magnet
212 - The angle between the ________ and the incident ray is called the angle of incidence.
Normal
213 - The apparent weight of a man in a lift is less the real weight when :
The lift is going down with an acceleration
214 - The atmospheric air is held to the Earth by :
Gravity
215 - The blue colour of sky is due to
Scattering of shorter wavelengths of sunlight in the atmosphere
216 - The boiling point of liquids vary as
Pressure varies
217 - The boiling point of water depends upon the
Atmospheric pressure
218 - The commonly used coolant in refrigerators is
Freon
219 - The component used for tuning a radio is basically a variable
Condenser
220 - The cover of a solar cooker is made of glass because
It retains the heat inside by the green house effect
221 - The damage of the human body due to radiation (X-rays or gamma rays etc) is measured in :
Rems
222 - The device used to convert solar energy into electricity is
Photovoltaic cell
223 - The device which converts AC to DC is
Rectifier
224 - The device which converts sound energy into electrical energy is called
Microphone
225 - The dimension of which of the following is the same as that of impulse ?
Momentum
226 - The dimensional formula ML–1T–2 corresponds to
Modulus of elasticity
227 - The energy obtained from atoms is known as ________
Nuclear energy
228 - The energy stored in a watch spring is
Potential energy
229 - The energy that generates wind comes from what source?
Solar radiation
230 - The filament of electric bulb is made up of :
Tungsten
231 - The first law of thermodynamics is simply the case of
The law of conservation of energy
232 - The focal length of a concave mirror with a radius of curvature of 20.0 cm is :
10 cm
233 - The following particles move with same kinetic energy. Which of them has maximum momentum ?
Alpha Particle
234 - The force exerted on an object is 200 N and its mass is 100 kg. Find the acceleration of the object.
2 m/sq.s
235 - The force of friction between two surfaces will increase if:
The two surfaces are pressed harder
236 - The freezing point of fresh water is ________ .
0°C
237 - The frequency of ultrasound wave is typically
Below 20 kHz
238 - The fundamental scientific principle in the operation of battery is
Dissociation of electrolytes
239 - The ''Greenhouse effect' is mainly due to increase in atmospheric
Carbon dioxide
240 - The height of a geo-stationary satellite from the Earth's surface is approximately :
36,000 km
241 - The Hydraulic Break works on the principle of ________ .
Pascal's Law
242 - The inability of a body to change its state of rest or uniform motion along a straight line is called its
Inertia
243 - The increasing order of the refractive index of certain materials is (left to right) ________
Ice, Kerosene, Benzene, Rock Salt
244 - The information of brilliant colors in a thin soap film is a consequence of the phenomena of
Multiple reflection and interference
245 - The instrument for measuring intensity of earthquakes is called
Seismograph
246 - The instrument that measures and records the relative humidity of air is
Hygrometer
247 - The instrument used to measure the speed of the wind is
Anemometer
248 - The instrument used to see the distant objects on the Earth is
Terrestrial telescope
249 - The layer of atmosphere used for radio-wave transmission is
Ionosphere
250 - The least penetrating power ray is
Alpha rays
251 - The Length of the Day is determined in
Astronomical units
252 - The locomotion of insects to the source of light is called :
Phototropic
253 - The magnitude of buoyant force depends on the ________ of the fluid.
Density
254 - The magnitude of current flowing between two end points of a conductor is proportional to the potential difference between them and is called as:
Ohms law
255 - The mass of a star is two times the mass of the Sun. How it will come to an end ?
Neutron Star
256 - The mercury and sodium street lamps light up because of :
Atomic emission
257 - The moment of inertia of a body does not depend upon its
Angular velocity
258 - The oil in the wick of an oil lamp rises up due to:
Capillary action
259 - The oil in the wick of lamp rises due to
Pheonomenon of capillarity
260 - The ordinary and maximum tolerance limit of sound by human being is
60 db to 80 db (decibel)
261 - The period of revolution of a certain planet in an orbit of radius R is T. Its period of revolution in an orbit of radius 4R will be:
8 T
262 - The phenomenon of change in direction of light when it passes from one medium to another is called
Refraction
263 - The phenomenon of light associated with the appearance of blue colour of the sky is
Scattering
264 - The phenomenon which causes mirage is
Total internal reflection
265 - The pressure of a fluid varies with depth h as P = PQ+pgh, where p is the fluid density. This expression is associated with
Pascal's law
266 - The propagation of sound waves in a gas involves
Adiabatic compression and rarefaction
267 - The quality or tone of a musical sound produced by a stringed instrument depends on
Wave form of the sound
268 - The radiant energy having lowest energy is
Microwave radiation
269 - The rate of flow of electric charge is measured in
Ampere
270 - The refractive index of a transparent medium is maximum for
Violet light
271 - The resistance of the human body (dry condition) is of the order of
None of these
272 - The reverse effect of X–ray emission is
Photoelectric
273 - The S.I. unit of electric charge is :
Coulomb
274 - The sharpness of a television image is termed as its
Resolution
275 - The sky appears blue because of
Scattering of light
276 - The snow on the mountains does not melt all at once when it is heated by the sun because:
It reflects most of the heat from the sun
277 - The speed of light will be minimum while passing through
Glass
278 - The splitting of different colours of light in a prism is :
Disperson of light
279 - The splitting of white light into its components is due to:
Dispersion
280 - The spokes used in the wheel of a bicycle increase its
Moment of inertia
281 - The strength of an electromagnet can be increased by
All of the above
282 - The sudden fall of atmospheric pressure indicates
Storm
283 - The swing of a spinning cricket ball in air can be explained on the basis of
Turbulence caused by wind.
284 - The term photon refers to
Sub atomic particle
285 - The theory of relativity is presented by which scientist
Albert Einstein
286 - The type of mirror used in automobiles to see the traffic on the rear side is
Convex
287 - The type of mirrors used in the headlamp of cars is
Parabolic concave
288 - The unit of energy in MKS system is
Joule
289 - The unit of intensity of electric field is
N/c
290 - The unit of magnetic permeability is
Henry/meter
291 - The unit of Planck's constant is
Js
292 - The velocity of heat radiation in vacuum is
Equal to that of light
293 - The velocity of sound in moist air is more than in dry air because the moist air has
Less density than dry air.
294 - The velocity of the sound is highest in
Metal
295 - The wall of a dam is broader at the base
To withstand pressure that increases with depth
296 - The wavelength at which the peak of intensity of blackbody radiation occurs
Decreases with increase in temperature
297 - The weakest of all fundamental forces is
Gravitational force
298 - The word "Physics" comes from the Greek word
Fusis
299 - Thermohaline circulation is mainly due to
Cold, dense ocean water sinking and warmer water replacing it
300 - These waves cannot be transmitted through vacuum.
Sound
301 - To prevent damage from lightning, lightning conductors are used on tall structures. The lightning conductor
Should be made of a good conductor like copper with sharp-pointed edges
302 - Two electric bulbs marked 25W – 220V and 100W – 220V are connected in series to a 440Vsupply. Which of the bulbs will fuse?
25 W
303 - Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen?
Both will reach the same height
304 - Two vectors are said to be equal if
Both magnitude and direction are same
305 - Unit of impedance is ________
Ohm
306 - Vehicle tyres are inflated properly
To avoid skidding and to minimise friction
307 - Velocity of sound in air does not change with the change of
Pressure of air
308 - What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius ?
No change will happen
309 - What colour does blue and yellow make?
Green
310 - What device converts light energy to electrical energy?
Photovoltaic cell
311 - What frequency range is the high frequency band?
3 to 30 MHz
312 - What is the gravity of moon as compared to the Earth
1/6 th of Earth
313 - What is the minimum distance (in metres) required to hear an echo?
17
314 - What is the range of masses involved in the study of Physics?
10-30 kg to 1055 kg
315 - What is the SI unit of electric current?
Ampere
316 - What is the SI unit of intensity of sound?
Decibel
317 - What principle/law explains the working of the hydraulic brakes in automobiles ?
Pascal's law
318 - What property of matter is momentum related to?
Both A & B
319 - What type of lens is a magnifying glass?
Converging
320 - What will happen if an object is dropped from a height and there is no air resistance?
Its speed will increase
321 - When a ball is thrown vertically upwards, which of the following quantities remains constant during its motion?
Energy
322 - When a bottle of perfume is opened in one corner of a room the smell spreads soon throughout the room. This is an example of
Diffusion
323 - When a bullet is fired from a gun
The gun recoils with the same momentum as the bullet
324 - When a card placed over a tumbler is flicked with the finger, the coin placed over it falls in the tumbler.
Law of Inertia
325 - When a piece of pure silicon is doped with aluminium, then
The doped silicon piece will become p-type
326 - When a ship enters the sea from a river
It rises a little
327 - When a steel ball is placed on the surface of mercury, it does not sink because
The density of mercury is greater than that of steel
328 - When a vehicle passes, TV reception gets distorted. This is because
Spark plug creates electromagnetic disturbances
329 - When heated from 0 to 100oC volume of a given mass of water will :
Decrease and then will increase
330 - When the barometer reading dips suddenly, it is an indication of
Storm
331 - When the speed of car is doubled, then what will be the braking force of the car to stop it in the same distance ?
Four times
332 - When two semiconductors of p and n-type are brought in contact, they form p-n junction which acts like a/an
Rectifier
333 - When two similar sources vibrate with slightly different frequencies, a regular rise and fall occurs in the loudness of tone. This phenomenon is known as
Beats
334 - Where do the electrical charges reside in a charged conductor?
Outer surface of the body
335 - Which among the following determines the pitch of a sound?
Frequency
336 - Which color deviates highest when passing through a Prism
Violet
337 - Which color deviates least when passing through a Prism
Red
338 - Which colour has the highest frequency?
Violet
339 - Which component of an IED creates an electrical charge?
Power source
340 - Which determines the frequency of a sound wave?
Amplitude
341 - Which is a correct way to measure wavelength?
Nearest peak to peak
342 - Which is an example of Phototropism?
Plant bending toward the light
343 - Which is evidence that supports the dynamo theory?
Earth's core contains a large amount of iron
344 - Which law is also called law of inertia ?
Newton first law
345 - Which of the following celestial bodies contains abundant quantities of helium-3, a potential source of energy ?
Moon
346 - Which of the following circuit elements is used to ''block" DC in an electronic circuit ?
Capacitance
347 - Which of the following device is best suited for measuring the temperature inside metallurgical furnaces?
Pyrometer
348 - Which of the following device is used to measure humidity?
Hygrometer
349 - Which of the following devices can be used to detect radiant heat ?
Thermopile
350 - Which of the following events occurred first ?
Max Planck unveiled the Quantum Theory
351 - Which of the following experiments analyzed the Fraunhofer lines of the solar spectrum?
Bunsen and Kirchhoff's experiment
352 - Which of the following features of a tunnel diode is its drawback?
Instability due to negative resistance
353 - Which of the following group of elements are diamagnetic?
Argon, copper, silver
354 - Which of the following has got more heat capacity ?
Water
355 - Which of the following has the highest frequency?
Cosmic rays
356 - Which of the following has the longest wavelength?
Infrared radiation
357 - Which of the following instruments is used to measure humidity ?
Sling Psychrometer
358 - Which of the following is a renewable source of energy
Wind
359 - Which of the following is a result of Surface tension ?
Capillary action
360 - Which of the following is a vector quantity?
Area
361 - Which of the following is indicated by the colour of a star ?
Temperature
362 - Which of the following is not a form of Energy?
Pressure
363 - Which of the following is not a vector quantity ?
Speed
364 - Which of the following is not a vector quantity?
Density
365 - Which of the following is not an intrusive igneous body?
Stope
366 - Which of the following is not caused by atmospheric refraction of light ?
Sun appearing higher in the sky than it actually is
367 - Which of the following is the fastest communication channel?
Microwave
368 - Which of the following is the second largest source of global energy?
Renewable Energy
369 - Which of the following is the unit of perceived loudness of sound ?
Sone
370 - Which of the following is used to split white light into different colours ?
Prism
371 - Which of the following is/are part of the Classical Physics?
Both a and b
372 - Which of the following laws validates the statement that matter can neither be created nor destroyed ?
Law of conservation of mass
373 - Which of the following principle is used to produce ''low-temperatures' ?
Adiabatic demagnetisation
374 - Which of the following produces more severe burns ?
Steam
375 - Which of the following scientific discoveries was made by C.V. Raman?
Inelastic scattering of light by molecules
376 - Which one among the following components is used as an amplifying device?
Transistor
377 - Which one among the following doesn't have any effect on velocity of sound ?
Humidity
378 - Which one of the following is the correct sequence of passage of light in a compound microscope?
Condenser -Objective lens -Body tube -Eyepiece
379 - Which one of the following is used for sun glasses ?
Crooks glass
380 - Which one of the following processes is responsible for the glittering of air bubble rising through water?
Total internal reflection of light
381 - Which one of the following reflects back more sunlight as compared to other three?
Land covered with fresh snow
382 - Which phase change is an example of an exothermic process?
All the above
383 - Which physical quantity is measured in 'siemens'?
Electrical conductance
384 - Which results in an increase in power?
Doing more work in less time.
385 - Which set of conditions represents the easiest way to liquify a gas ?
Low temperature and high pressure
386 - Which sources produce alternating current (AC)?
Hydro-electric generators
387 - Which type of mirror is used in the head lights of vehicles ?
Concave mirror
388 - Which type of radiation has the lowest penetrating ability?
Alpha
389 - Which, of the following radiations has the least wavelength ?
G-rays
390 - Who among the following developed the technology of underground nuclear explosion ?
Dr. Homi J. Bhabha
391 - Who among the following is credited for the Corpuscular theory of light?
Isaac Newton
392 - Who among the following is credited to work for the unification of electricity, magnetism and optics field of Physics?
James Clerk Maxwell
393 - Who measured the velocity of light first ?
Romer
394 - Why are we able to hear short wave broadcasts better than long wave broadcasts ?
Short waves are more energetic than long waves.
395 - Why does a cannon recoil after firing ?
Newton's third law of motion
396 - Why does bleeding occur through the nose in high mountainous regions ?
The blood pressure of a person increases at high altitudes
397 - Why does water tank appear shallower when viewed from the top?
Due to refraction
398 - Why is it difficult to breathe at higher altitudes?
Due to low air pressure
399 - Why is weightlessness experienced while orbiting the earth in space ships ?
None of these
400 - Work done in a free expansion process is
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