1 - ________ is used for making vinegar.
Acetic acid
2 - 0.01 mole of NaOH is added to 10 liters of water. The pH of water changes by
4
3 - 0°K is equivalent to
– 273°C
4 - 1 Micron is equal to
10–6 m
5 - A boat will submerge when it displaces water equal to its own:
Weight
6 - A bottle of sodalime is grasped by the neck and swung briskly in a vertical circle, Near which portion of the bottle do the bubbles collect?
Near the neck
7 - A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to 300°C and left in a room. Which of them will have the slowest rate of cooling?
Sphere
8 - A concave lens always forms an image which is
Virtual and erect
9 - A copper disc has a hole. If the disc is heated, the size of the hole
Increases
10 - A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be
R/5
11 - A current carrying conductor is associated with
An electro-magnetic field
12 - A cyclist leans inwards when he is negotiating a curve so that
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
13 - A decibel is
A measure of sound level
14 - A disk and a sphere of same radius but different masses roll on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first ?
Sphere
15 - A doppler effect occurs when a source of sound moves
Both A & B
16 - A good conductor while carrying current is
Negatively charged
17 - A hydrogen balloon floats up because of
Weight of the balloon is less than the weight of air displaced by it.
18 - A metal is exposed to the atmosphere for sometime. It becomes coated with green carbonate. The metal must be
Copper
19 - A passenger standing in a bus is thrown outward when the bus takes a sudden turn. This happens due to
Inertia of motion
20 - A pilot has to release the bomb to hit a target
Before the target
21 - A small drop of oil spreads over water because :
Water has a higher surface tension
22 - A soap bubble shows colours when illuminated with white light. This is due to
Interference
23 - A solid ball of metal has a spherical cavity inside it. When the ball is heated the volume of the cavity will
Increase
24 - A solution is
A homogeneous mixture of two or more substances
25 - A sphere rolls down on two inclined planes of different angles but same height, it does so
With the same speed
26 - A spring is an example of which of these
Hooke's law
27 - A white and smooth surface is
Bad absorber and good reflector of heat
28 - After long periods of use, a grey spot develops on the inside of a bulb. This is because
Dust inside the bulb condenses on the top
29 - Aluminium can be purified by
Electrolysis
30 - An electric iron has a heating element made of :
Nichrome
31 - An object at rest may have
Potential energy
32 - An object which absorbs all colours and reflects none appears:
Black
33 - An oxidising agent is a
An electron acceptor
34 - Analog synthesis refers to a technology based on
Representing data in terms of measurable physical quantities.
35 - Aspirin is chemically known as
Acetylsalicylic acid
36 - At hill stations, the boiling point of water will be
Less than that at sea level
37 - At room temperature, the metal that remains liquid is:
Mercury
38 - At what temperature do the Fahrenheit and Celsius scales give the same reading?
-40 degreees
39 - Atoms having the same number of protons but different number of neutrons are called :
Isotopes
40 - Atoms of same element having different mass numbers are called________
Isotopes
41 - Bandwidth is the
Both a & b
42 - Baryllium Sulphate is less soluble in water due to
High inflammable energy
43 - Bhopal gas tragedy is associated with leakage of
Methyl isocyanate
44 - Bleaching action of moist sulphur dioxide is because of its
Oxidising property
45 - Bleaching powder is prepared by passing :
Chlorine over slaked lime
46 - Boyle's law is a relationship between
Pressure and volume
47 - Brass is a solution of molten copper in
Molten zinc
48 - Charcoal is used in water treatment as a/an
Adsorbent
49 - Chemical properties of isotopes
Must be same
50 - Chile saltpeter is the common name of:
Sodium nitrate
51 - Cinnabar is an ore/mineral of
Mercury
52 - Colour imparted to the Bunsen flame by strontium salt is
Crimson red
53 - Commonly used antiseptic 'Dettol' is a mixture of
Chloroxylenol + terepineol
54 - Compressions and Rarefactions are characteristic of
Longitudinal waves
55 - Conduction band electrons have more mobility than holes because they
Experience collision less frequently
56 - Conversion of heat into electrical energy is achieved by using :
Thermocouple
57 - Damp clothes are dried in spin dryers by the action of
Centrifugal forces
58 - DDT and BHC may act as
Carcinogens
59 - Depth of ocean is measured by
Fathometer
60 - Domestic cooking gas consists mostly of
Liquified butane and isobutane
61 - During fermentation of sugar, the compound which is always formed is :
Ethyl Alcohol
62 - Eclipses occur due to which optical phenomena?
Rectilinear propagation
63 - Electric bulbs are filled with :
Argon
64 - Electric current is measured by which instrument?
Ammeter
65 - Electricity is transmitted over long distances
There is less wastage of energy
66 - Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives
Copper at cathode and oxygen at anode
67 - Electromagnet is constructed with which of the following ?
Soft Iron
68 - Entropy of Universe is always
Increasing
69 - Every hot object emits ________
Infrared rays
70 - Except mercury which is the other metal that is liquid at standard conditions for temperature and pressure?
Bromine
71 - Exposure to mixtures of chemicals are greater than expected on the basis of effects of exposure to each chemical individually. This is known as
Synergism
72 - Ferrous sulphate is used in water treatment as a/an
Coagulant aid
73 - Find the odd one:
Slaked lime
74 - Find the resistance (in mega) of a wire of length 20m, cross sectional area 1 cm2 and made of a material of resistivity 200m.
40
75 - 'Fire-fighting clothes' are made from
Asbestos
76 - Fleming's right hand rule is used to find the direction of the
Induced current
77 - Food cans are coated with tin and not with zinc because
Zinc is more reactive than tin
78 - For generation of biogas, the materials commonly used are
Animal wastes
79 - Formic acid is produced by
Red ants
80 - Galvanised iron is made by coating iron with
Zinc
81 - Gear finishing operation is called
Burnishing
82 - German silver, an alloy, does not contain the metal
Silver
83 - Glycol is used to manufacture which of the following ?
Terylene
84 - Golden view of sea shell is due to
Polarization
85 - Gunpowder consists of a mixture of
Nitre, sulphur and charcoal
86 - Gypsum is used for improvement of:
Saline soils
87 - Helium gas is filled in balloons because
It is lighter than air
88 - Hertz is a unit for measuring
Frequency of waves
89 - High concentration hydrocarbon pollutants in atmospheric air causes
Cancer
90 - Highest percentage of carbon is found in which form of coal?
Anthracite
91 - Hot springs are heated geothermally by underlying
Magma
92 - Hot water is poured simultaneously in four metallic tumblers painted outside with different paints. After some time the water will be found to have cooled most in the tumbler painted.
Rough black
93 - How many neutrons does iron have?
30
94 - Identify the vector quantity from the following
Angular momentum
95 - If a band is played on the moon the sound will
Not be heard at any distance at all from it
96 - If a barometric reading is falling, this usually indicates what
Decreasing pressure
97 - If a body moves with a constant speed in a circle
Its velocity remains constant
98 - If a buffer solution is diluted its pH
Remains same
99 - If ice floating on water in a vessel melts, the water level in the vessel ________ .
Does not change
100 - If the spinning speed of the earth is increased then the weight of body at the equator
Decreases
101 - If we burn graphite,
No residue will be left
102 - Impure camphor is purified by
Sublimation
103 - In a Carbonyl group a carbon atom makes double bond with
Oxygen
104 - In a freezer ice cubes will be formed more quickly in trays made of
Aluminium
105 - In a Laser (say neon laser) all the atoms emit the light waves of
All of the above
106 - In a period from Li to F, ionisation potential
Cannot be predicted
107 - In a reaction of the type A+B -> C+D one could ensure it to be a first order reaction by :
Increasing the concentration of a reactant
108 - In order to make an electromagnet you need a
All of the above
109 - In quantum mechanics a particle is represented by a
Wave packet
110 - In the periodic table of elements, on moving from left to right across a period, the atomic radius
Decreases
111 - In upper layer of atmosphere ozone is formed by
The action of ultraviolet rays on oxygen
112 - In very cold countries alcohol is used as a thermometric liquid because
Its freezing point is very low
113 - In which of the following industries is mica as a raw material?
Electrical
114 - In which of the following states maximum iron ore is found ?
Fe2O3
115 - Indane gas is mixture of
Butane and propane
116 - Infrasonic sound has a frequency lower than
20 Hz
117 - Instrument used to measure the force and velocity of the wind is
Anemometer
118 - Iodine can be separated from a mixture of Iodine and Potassium Chloride by
Sublimation
119 - Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has
Stable half filled 2p sub level
120 - Iron filings can be separated from a heterogeneous mixture using the technique of :
Magnetization
121 - Iron is extracted from
Haematite
122 - Iron is prevented from rusting by coating with zinc. This process is called as
Galvanisation
123 - It is easier for a man to swim in sea water, than in river water because
The density of sea water is more than the density of river water
124 - Kinetics is the study of:
All of these are correct
125 - KMnO4 can be used as a/an
Disinfectant
126 - Knot is a measure of
The speed of ship
127 - Large astronomical telescopes always use as objective
combinations of lenses
128 - Lead pencil contains
Graphite
129 - Light Emitting Diodes (LED) is used in fancy electronic devices such as toys emit
visible light
130 - Light from Sun reaches Earth in approximately
8 minutes
131 - Light travels at the fastest speed in:
vacuum
132 - Liquids and gases never show
Ferromagnetic property
133 - Many people died in London in 1952 as result of air pollution producing
Smog
134 - Mercury is commonly used as a thermometric fluid rather than water because
mercury has greater visibility than water
135 - Microphone is a device which transforms the
Sound signal into current signal
136 - Milk is a
Mixture
137 - Milk tastes sour when kept in the open for sometime due to the formation of
Lactic acid
138 - Mixture can be
Both A and B
139 - Molality of pure water is
55.5
140 - Mud houses are cooler in summers and warmer in winters as compared to brick houses because
Mud is a bad conductor
141 - Negative feedback in amplifiers
Increases bandwidth and decreases noise
142 - Neoprene is a polymer of
Chloroprene
143 - Neoprene is prepared by polymerisation of which of the following
2-chloro-1, 3-butadiene
144 - No current will flow between two charged bodies if they have the same
Potential
145 - Nucleons are regarded as composites sub-particles known as
Quarks
146 - Nucleus of an atom consists of.
Proton and Neutron
147 - Nylon is a type of
Polyamide
148 - Nylon is made up of :
Polyamide
149 - Nylon threads are made of
Polyamide polymer
150 - Oil raise up the wick in a lamp. The principle involves
capillary action phenomenon
151 - On a clean glass plate a drop of water spreads to form a thin layer whereas a drop of mercury remains almost spherical because
Cohesion of mercury is greater than its adhesion with glass
152 - One of the constituents of tear gas is
Chloropicrin
153 - One should not connect a number of electrical appliances to the same power socket because
this can damage the domestic wiring due to overloading
154 - Optical fibre works on the
total internal reflection
155 - Out of the following pairs, which one does not have identical dimension?
Moment of inertia and moment of a force
156 - Ozone depletion in the atmosphere is mainly caused by
Chlorofluorocarbon
157 - Ozone depletion in the stratosphere is mainly caused by
Chlorofluorocarbons
158 - 'Parsec' is the unit measurement of
Astronomical distance
159 - Photo-oxidation process is initiated by
Light
160 - Plastic is a type of
Polymer
161 - Polythene is polymer of
Ethylene
162 - Preparation of ‘Dalda or Vanaspati' ghee from vegetable oil utilizes the following process :
Hydrogenation
163 - Q = mcdT refers to
Specific Heat formula
164 - Quality of a musical note depends on
Harmonics present
165 - Radio waves sent out by a radio stations are reflected by
Ionosphere
166 - Radiocarbon dating technique is used to estimate the age of
fossils
167 - Railway tracks are banked on curves
necessary centripetal force may be obtained from the horizontal component of the weight of the train
168 - Rain drops acquire spherical shape due to
Surface tension
169 - Rocket works on the principle of
Newton's Third Law
170 - Sending a frame to a group of stations is known as
Multicasting
171 - Setting of plaster of paris involves
Hydration to form other hydrates
172 - Silicone is a polymer of
Dialkyl dichloro silane
173 - Silk fibre chemically is :
Protein
174 - Silver gets corroded due to ________ in air.
Hydrogen Sulphide
175 - Slag is a name given for
Molten alumina
176 - Slip rings are usually made of
Phosphor Bronze
177 - Sodium is produced by the electrolysis of
Molten sodium chloride
178 - Solder is an alloy of
Tin, lead
179 - Solder is an alloy of
Tin and lead
180 - Solder metal is an alloy of
Lead and tin
181 - Solids have definite shapes.This is because
The forces of cohesion are very large
182 - Sound travels at the fastest speed in
steel
183 - Sound waves do not show the phenomenon of
Polarisation
184 - Speed of sound is maximum in which among the following?
Solids
185 - Speed of sound is the greatest in :
Glass
186 - Stainless steel is an alloy of
Chromium, carbon and iron
187 - Stains of rust on clothes can be removed by :
Oxalic acid
188 - Stars are held together by
Gravitational forces
189 - Stationary wave is formed by
Two waves of same frequency travelling in the opposite direction
190 - Steam at 100°C causes more severe burns than water at 100°C because
Steam has latent heat of vaporisation
191 - Sullage water is –
Waste water released from kitchen
192 - Sulphur dioxide bleaches colouring matter by :
Reduction
193 - Sun appears red in colour at sunrise and sunset due to
That all other colours scatter away except red
194 - Superconductors are substances which
offer no resistance to the flow of electricity
195 - Supercooling is cooling of liquid ________
Below freezing point
196 - Synthetic detergents are made from
Sodium salt of benzene sulphonic acid
197 - Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water
Decreases slightly
198 - Terylene is a condensation polymer of ethylene glycol and which acid?
Terephthalic acid
199 - The absorption of ink by blotting paper involves
Capillary action phenomenon
200 - The alkaloid naturally found in coffee, cocoa and cola nut is
Caffeine
201 - The amount of matter in a ball of steel is its :
Mass
202 - The anode in a dry cell consists of
Zinc
203 - The antiparticle of an electron is
Positron
204 - The apparatus used to test acidity of aqueous solution is
PH meter
205 - The aqueous solution of potassium chloride is
A strong electrolyte
206 - The atmosphere is heated mainly by
Radiation
207 - The charcoal used to decolourise brown sugar solution is
Animal charcoal
208 - The chemical name of ‘Common salt' is
Sodium chloride
209 - The chemical name of 'laughing gas' is
Nitrous oxide
210 - The chemical name of 'Plaster of Paris' commonly used for setting broken bones is
Calcium sulphate
211 - The chemical that is used to ripen mangoes is
Calcium carbide
212 - The chemical used for cloud seeding for artificial rains is
Silver Iodide
213 - The chemical used in embalming biological materials is
Formaldehyde in water
214 - The chemical(s) most commonly used for cloud seeding or ‘artificial rainmaking' is/are
Silver Iodide
215 - The chief constituent of vinegar is
Acetic acid
216 - The coil wire in the electric room heater or electric cooking heater is called ________
Element
217 - The colour of sky appears blue due to
Scattering of shorter wave lengths
218 - The colours of stars depend on their
Temperature
219 - The common refrigerant in domestic refrigerator is
Freon
220 - The composition of electrician solder is
Lead-37%, tin-63%
221 - The device used to change the speed of an electric fan is
Regulator
222 - The direction of heat flow between two objects depends on
Their temperatures
223 - The drug ‘Marijuana' is a
Sedative
224 - The earth is a
Good absorber and good radiator of heat
225 - The electrical domestic tube light gives white fluorescent light because of
Falling of ultra violet rays on the white inner coating of the tube
226 - The electronic configuration of an atom having atomic number ‘20' is
2, 8, 8, 2
227 - The element used for making solar cells is
Silicon
228 - The element with highest first ionisation energy is
Helium
229 - The elements with atomic numbers 9, 17, 35, 53, 85 are all
Halogens
230 - The fact that the planets move around the Sun, not in circles but in ellipses, was first demonstrated by
Johannes Kepler
231 - The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by
Bernoulli's principle
232 - The force that binds the neutrons and protons in a nucleus is called as:
Strong Nuclear Force
233 - The function of ball bearings in a wheel is :
To increase friction
234 - The function of sedimentation tank in sewage treatment is to:
Remove suspended solids
235 - The gas liberated in the Bhopal gas tragedy was:
Methyl isocynate
236 - The gas used in the artificial ripening of fruits is
Acetylene
237 - The humidity of the air depends upon
All of the above
238 - The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is
Helium
239 - The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is:
Helium
240 - The inert gases are ____ in water.
sparingly soluble
241 - The intensity ratio of waves is 25 : 9. What is the ratio of their amplitudes?
0.21041666667
242 - The Laser is a beam of radiations which are
Coherent and monochromatic
243 - The law which states that the amount of gas dissolved in a liquid is proportional to its partial pressure is
Henry's law
244 - The light of distant stars is affected by
Both A & B
245 - The lightest gas which is non-inflammable is
Helium
246 - The main constituent of natural gas is
Methane
247 - The main source of carbon monoxide is
Transportation
248 - The major component in the LPG is
Butane
249 - The mass number of a nucleus is
Sometimes more and somtimes equal to its atomic number
250 - The material known in commerce as Terylene is a
Synthetic fibre
251 - The material used in electric heater is
Nichrome
252 - The metal used to galvanise iron to protect it from rusting is
Zinc
253 - The metal chiefly used for galvanising iron is :
Zinc
254 - The metal that is usually extracted from sea water is
Mg
255 - The metallurgical process in which a metal is obtained in a fused state is called
smelting
256 - The method of concentrating the ore which makes use of the difference in density between ore and impurities is called
levigation
257 - The molecular formula of phosphorous is
P4
258 - The molecules of which gas have highest speed?
H2 at -73oC
259 - The monomers of dacron are
Ethylene glycol and terephthalic acid
260 - The most electronegative element among the following is
Fluorine
261 - The motion of a body around a circular path is an example of
Uniform velocity, variable acceleration
262 - The names of the scientists, Newlands, Mendeleev, and Meyer are associated with the development of
periodic table of contents
263 - The National Chemical Laboratory (India) is located in
Pune
264 - The nucleus of an atom consists of
Protons and Neutrons
265 - The number of d-electrons in Fe2+ (Z = 26) is not equal to that of
p-electrons in CI(Z = 17)
266 - The number of waves per second in a sound is called ________ of that sound.
Frequency
267 - The oldest rocks in the earth's crust were once molten, and came from deep inside the earth. The molten rock, called magma, spewed out in volcanic eruptions during the earth's early life and solidified into hard rock's called
igneous rocks
268 - The oldest type of energy known to man is
Geothermal energy
269 - The p wave of a normal Electrocardiogram indicates
Atrial depolarization
270 - The percentage of carbon in cast iron is :
3 to 5
271 - The pitch of sound depends on its
Frequency
272 - The polymer obtained by the condensation of hexamethylene diamine and adipic acid is :
Nylon 66
273 - The pressure exerted by a 760 mm column of mercury at 0°C is known as
1 pascal
274 - The purest form of Iron is :
Wrought iron
275 - The purpose of choke in tube light is
Induce high voltage
276 - The Refrigerant 'FREON' is
Difluoro Dichloro Methane
277 - The ringing of an electric bell in an enclosed evacuated glass bell jar is not heard outside because
There is no air or any other gas in the bell jar
278 - The rotational effect of a force on a body about an axis of rotation is described in terms of
Moment of force
279 - The safest hammers are those with heads that are
Alloy and drop-forged steel
280 - The shape of our milky way galaxy is
Spiral
281 - The Solar energy produced by
Fusion reaction
282 - The source of the Sun's energy is the process of
Nuclear fusion
283 - The speed of light in air is
3 × 108 m/s
284 - The speed of sound travel fastest through
Solid
285 - The substance which conducts current in the solid state is
Graphite
286 - The surface tension of water on adding detergent to it
Decreases
287 - The temperature of a liquid is 32° F. What is its temperature in Celsius scale?
0° C
288 - The unit for measuring electric power is the
Watts
289 - The unit of noise pollution (level) is :
Decibel
290 - The velocity of falling rain drops attains a terminal value because of
Viscous force exerted by air
291 - The velocity of sound in air
Decreases with decrease of temperature
292 - The wall of a dam is made thicker at the bottom than at the top because the pressure exerted by the water on the wall
Increases with depth of the wall
293 - The washing machine works on the principle of
Centrifugation
294 - The wave like properties of electrons are useful in
Magnifying objects
295 - The weight of a body acts through the centre of
Gravity
296 - The word ''insolation' means
Incoming solar radiation
297 - Threshold limit value of copper in the atmospheric air is
1.0 mg/m3
298 - Through which light cannot pass?
Book
299 - To convert temperature from Celcius to Kelvin scale, you must ________ the given temperature.
Add 273
300 - Total number of colours exists in sunlight
7
301 - Total number of halogen elements found in the periodic table is
5
302 - Trinitrotoluene is
Used as an explosive
303 - Two metallic plate of equal thickness and coefficient thermal conductivity K1 and K2 put together face to face. A common plate is constructed. What is equivalent K?
2k1k2/k1+k2
304 - Two metallic wires made from copper have same length but the radius of wire 1 is half of that of wire 2. The resistance of wire 1 is R. If both the wires are joined together in series, the total resistance becomes
5R/4
305 - Two rods, one of copper and other of steel, experience the same upthrust when placed in water.Thus, both have
Equal volume
306 - Ultrasound devices operate with minimum frequency from
20kHz
307 - Ultraviolet radiation striking the earth is due to the depletion of
Ozone
308 - Vegetables are cooked in lesser time by adding a pinch of salt while cooking because
Boiling point of water increases
309 - 'Vinegar' is a commercial name of
Acetic acid
310 - Vinegar made by fermentation from cane sugar contains
Acetic acid
311 - Water from soil enters into the root hairs owing to :
Capillary pressure
312 - Water is not suitable as a calorimetric substance because it :
Has high specific heat
313 - Water is used in car radiator because of its
High specific heat capacity
314 - Water pipes in hilly areas often burst on a cold frosty night, because
Water in the pipes freezes and on freezing water expands, so pipes break
315 - We always see the same face of the moon, because
It takes equal time for revolution around the earth and rotation on its own axis
316 - What apparatus is used to locate a submerged object?
Sonar
317 - What factors contribute to global winds?
All of the above
318 - What is the direction of torque?
Perpendicular to the direction of applied force
319 - What is the full form of "RADAR" ?
Radio Detecting and Ranging
320 - What is the full form of ''AM' regarding radio broadcasting?
Amplitude Modulation
321 - What is the other name of Galileo's law of falling bodies?
Newton's first law
322 - What is the phenomenon which established the transverse nature of light ?
Polarisation
323 - What is the principle of a ''Life Jacket"?
It increases the volume of the person to keep him afloat
324 - What is the process of conversion of solid state directly to gaseous state called?
Sublimation
325 - What is the size of Electron as comapared to Proton and Neutron?
1/1836
326 - What is the wavelength of visible spectrum ?
3900 A° – 7600 A°
327 - What should a person on a freely rotating turn table do to decrease his (angular) speed ?
Spread his hands outwards
328 - What type of force acts on a car moving around a curve?
Centripetal force
329 - When a barometer is rising air pressure is
Increasing
330 - When a barometer reading suddenly recedes, it indicates that climate–
Will be extremely stormy
331 - When a bottle of scent is kept open in a corner of a room its odour is felt in all parts of the room. This is due to the phenomenon of :
Diffusion
332 - When a lead storage battery is discharged,
Sulphuric acid is consumed
333 - When a light wave is reflected from a mirror, there is a change in its
Amplitude
334 - When a number of resistors are connected in series in a circuit, the value of current:
Remains the same
335 - When a piece of stone is immersed in water, it displaces water of equal
Mass
336 - When a ring of metal is heated what happens to its hole ?
Expands
337 - When a running car stops suddenly, the passengers tends to lean forward because of:
Inertia of motion
338 - When a stone is thrown in the calm water of a pond the waves produced on the surface of water in the pond are
Transverse
339 - When a vibrating tuning fork is placed on a table, a loud sound is heard. This is due to :
Forced vibrations
340 - When an atom loses an electron it becomes
Positive ion
341 - When an unbalanced force acts on an object
All of the above
342 - When hot liquid is poured into a thick glass tumbler, it cracks because glass :
Is a bad conductor of heat so only inner surface expands
343 - When number of turns in a coil is trippled, without any change in the length of coil, its self inductance becomes?
Nine times
344 - When pressure is increased the melting point of ice
Decreases
345 - When temperature difference between liquid and its surroundings is doubled, the rate of loss of heat will:
Double
346 - When there are two electrons in the same orbital, they have:
Opposite spin
347 - When white light passes through a glass prism we get a spectrum on the other side of the prism. In the emergent beam the ray which is deviated least is
The red ray
348 - Where are mesons found ?
Cosmic rays
349 - Which among the following elements is found in maximum percentage in the human body ?
Oxygen
350 - Which among the following is not a characteristic of transition metals?
Tendency to gain electrons
351 - Which among the following is pure matter ?
Carbon dioxide
352 - Which among the following is used to dilute oxygen in the gas cylinders used by divers ?
Helium
353 - Which among the following metals provides amphoteric oxide ?
Aluminium
354 - Which Color has the Longest Wavelength?
Red
355 - Which conservation principle is applicable in the case of the motion of a rocket?
Conservation of momentum
356 - Which is best used as a sound absorbing material in partition walls ?
Glass - wool
357 - Which is the purest form of iron?
Wrought iron
358 - Which law relates to the ideal gas law?
P1V1 = P2V2
359 - Which layer of the earth's atmosphere reflect back the radio waves to the earth's surface ?
Ionosphere
360 - Which liquid is the most viscous?
Oil
361 - Which measurement describes the pressure of a gas?
450 mm Hg
362 - Which metal is the best conductor of heat?
Copper
363 - Which of the following causes the rusting of iron? a. Oxidation b. Reduction c. Chemical reaction with oxygend. Chemical reaction with CO2
A and C
364 - Which of the following does the nucleus of an atom consists of?
Protons and neutrons
365 - Which of the following gases is present under pressure in soft drinks?
Carbon dioxide
366 - Which of the following has the lowest frequency?
Visible light
367 - Which of the following is a commercial source of energy?
Natural gas
368 - Which of the following is a good conductor of heat but a bad conductor of electricity ?
Mica
369 - Which of the following is a natural polymer?
Starch
370 - Which of the following is a secondary pollutant ?
CO
371 - Which of the following is an example of simple harmonic motion?
Simple pendulum motion
372 - Which of the following is arranged in order of decreasing conductivity?
Silver, Copper, Aluminium, Steel
373 - Which of the following is biodegradable ?
Paper
374 - Which of the following is not a commercial source of energy?
Firewood
375 - Which of the following is not a derivative of barbituric acid?
Equanil
376 - Which of the following is not a gaseous air pollutant?
Hydrocarbon
377 - Which of the following is not a natural source of hydrocarbon?
Mica
378 - Which of the following is not a noble gas ?
Hydrogen
379 - Which of the following is not a nucleon?
Positron
380 - Which of the following is not a part of a CRT ?
Gas plasma
381 - Which of the following is not an aerosol?
Mud
382 - Which of the following is ozone depleting pesticide ?
Methyl bromide
383 - Which of the following is secondary air pollutant ?
SO2
384 - Which of the following is the cleanest source of energy?
Wind energy
385 - Which of the following is used as anesthetic ?
NO
386 - Which of the following is used to remove ink and rust stains on cloth?
Oxalic acid
387 - Which of the following laser types is used in a laser printer?
Semiconductor laser
388 - Which of the following liquids has the least density ?
Petrol
389 - Which of the following methods is used in determining the number average molar mass of a macromolecule?
Osmotic pressure
390 - Which of the following pairs of materials serves as electrodes in rechargeable batteries commonly used in devices such as torch lights, electric shavers, etc. ?
Nickel and cadmium
391 - Which of the following phenomenon helps to conclude that light is a transverse wave?
Polarisation
392 - Which of the following represents a relation for ''heat lost = heat gained'?
Principle of calorimetry
393 - Which of the following substance's smell is similar to Ethanoic acid?
Vinegar
394 - Which of the following waves cannot be polarised?
Ultrasonic
395 - Which of the metals has the maximum thermal conductivity?
Silver
396 - Which of these liquids has the highest viscosity?
Syrup
397 - Which one element from below list is liquid at room temperature?
Bromine
398 - Which one is not a primary greenhouse gases in the Earth's atmosphere?
Nitrogen
399 - Which one is the most dense liquid from the below?
Choloform
400 - Which one is the simplest form of alkane?
Methane
401 - Which one is the unit of surface tension of a liquid
Electron volt /cm2
402 - Which one of the following contains maximum percentage of carbon ?
Cast iron
403 - Which one of the following elements is an example of noble gas ?
Helium
404 - Which one of the following has greatest mass ?
Neutron
405 - Which one of the following has the highest value of specific heat?
Water
406 - Which one of the following instruments is used to study dispersion of light ?
Spectrometer
407 - Which one of the following is commonly used for pulp bleaching in the paper industry?
Hydrogen peroxide
408 - Which one of the following is found in Vinegar ?
Acetic acid
409 - Which one of the following is known as the 'brown coal'?
Lignite
410 - Which one of the following is most acidic?
Al2O3
411 - Which one of the following is responsible for the working of Newton's colour disc experiment ?
Persistence of vision
412 - Which one of the following is used to restore the colour of old oil paintings ?
Hydrogen peroxide
413 - Which one of the following organic compound is used to remove stains of iron compounds?
Oxalic acid
414 - Which one out of the following helps in burning ?
Oxygen
415 - Who discovered X-ray?
Wilhelm Roentgen
416 - Who indirectly determined the mass of the electron by measuring the charge of the electron?
Millikan
417 - Who is known as the 'father of modern chemistry'?
Antoine Lavoisier
418 - Why do birds not have respiratory trouble at the time of flying at high altitude ?
They have extra air sacs
419 - Williamson's synthesis is widely used in the laboratory preparation of
Ethers
420 - Woollen cloth protects the body from cold because
It is a poor conductor of heat
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