Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

TRAIN-WAY > RL PHY 2 > Flashcards

RL PHY 2 Flashcards

1
Q

●Lux is the SI unit of: —

A

intensity of illumination

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

●On a rainy day, small oil films on water show brilliantcolours. This is due to: —

A

Interference

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

●Light travels at the fastest speed in: —

A

Vacuum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

●Light Emitting Diodes (LED) is used in fancyelectronic devices such as toys emit: —

A

Visiblelight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

●Rainbow is produced when sunlight fall on drops ofrain. Which of the following physical phenomenaare responsible for this? —

A

Refraction andInternal Reflection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

●All the rays coming from the source at the focus of aparabolic mirror are reflected as an intense:—

A

Parallel beam

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

●Advanced sunrise and delayed sun- set found in thesky are due to the phenomenon of: —

A

Refractionof sunlight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

●Recording a permanent three dimensionalphotograph of a given single colour or a multi-colour is known as:—

A

Holography

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

●What is colour of light related to: —

A

Frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

●What is viewed through an electron microscope?—

A

Structure of bacteria and virus

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The instrument which uses sound waves to measurethe depth of oceans is: —

A

SONAR

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

●Which combination of colour is the most convenientduring day and night time? —

A

Red and Green

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

●The speed of light with the rise in the temperature ofthe medium: —

A

Remains unaltered

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

●What is the wavelength of visible spectrum? —

A

3900Angstrom-7600 Angstrom

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

●Who measured the velocity of light first? —

A

Romer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

●An electron microscope gives higher magnificationthan an optical microscope because:—

A

thewavelength of electrons is smaller as compared tothe wavelength of visible light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

●Lamberts law is related to: —

A

Illumination

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

●Danger signals are generally red as red light:—

A

Undergoes least deviation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

●A simple microscope consists of:—

A

A short focusconvex lens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

“●”“Short-sight”” in human eye can be corrected by usingproper:—”

A

Concave lens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

●What is the reason for twinkling of stars?—

A

Atmospheric refraction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

●Which colour is the complementary colour of yellow?—

A

Blue

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

●A pond of water appears less deep due to: —

A

Refraction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

●The reason for a swimming pool to appear less deepthan the actual depth is: —

A

Refraction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Q

●The type of mirrors used in the headlamp of cars is:—

A

Parabolic Concave

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
26
Q

●When a person walking in bright Sunlight enters adark room, he is not able to see clearly for a littlewhile because:—

A

The iris is unable to dilate thepupil immediately

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
27
Q

●Spectacles used for viewing 3D films have: —

A

Polaroid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
28
Q

●According to the theory of relativity, which of thefollowing always remains constant?—

A

Velocity ofLight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
29
Q

●A colour-blind person cannot:—

A

distinguish betweencertain colours

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
30
Q

●A photo-electric cell converts: —

A

Light energy toelectrical energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
31
Q

●A concave lens always forms an image which is:—

A

Virtual and erect

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
32
Q

●Lens is made up of: —

A

Flint Glass

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
33
Q

●One can distinguish a telescope from a microscope byobserving: —

A

Length and size of the lens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
34
Q

●For a person having hypermetropia, the near point is:—

A

greater than 25 cm

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
35
Q

●Light houses are places with powerful lights to: —

A

guide and warn the ships coming from differentdirections in the ocean

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
36
Q

●Persistence of vision is the principle behind: —

A

Cinema

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
37
Q

●The light rays used for eliminating bacteria are:—

A

ultraviolet radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
38
Q

●A person wears spectacles with concave lenses. Itmeans that normally (when not using glasses), theimage of distant objects is focussed in his eyes: —

A

in front of the retina

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
39
Q

●Myopia is the same as: —

A

Near sightedness

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
40
Q

●A microscope used in pathological laboratoriesforms:—

A

Magnified, virtual and inverted image

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
41
Q

●The magnifying power of an astronomical telescopecan be decreased by:—

A

Increasing the focal lengthof the eyepiece

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
42
Q

●The owl can see most clearly in the dark because:—

A

ithas large eyes with orbs directed forward, givingit binocular sight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
43
Q

●Night photography and photography in mist and fogare possible using: —

A

Infra-red radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
44
Q

●The blue colour of water in the sea is due to:—

A

absorption of other colours except blue by watermolecules

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
45
Q

●Rainbow is seen after rain because of hangingmolecules of water which act as: —

A

Prisms

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
46
Q

●In sunlight, a rose appears red. In green light, thesame rose appears: —

A

Black

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
47
Q

●The sparkling of a diamond is due to:—

A

TotalInternal Reflection of light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
48
Q

●Parabolic mirrors are used in: —

A

Car headlights

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
49
Q

●The sharpness of a television image is termed as its:—

A

Resolution

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
50
Q

●The final image in a simple microscope is:—

A

Virtual,magnified and erect

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
51
Q

●Hypermetropia or long sight can be corrected byusing:—

A

Convex lenses

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
52
Q

●An optically plane surface reflects a beam of light:—

A

as diffused beams in all directions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
53
Q

●A periscope works on the principle of:—

A

Totalinternal reflection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
54
Q

●A rear-view mirror for driving is: —

A

Convex

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
55
Q

●The part of the eye having the largest refractive indexis:—

A

Lens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
56
Q

●A man cannot see clearly beyond 10 metres. Thedisease he suffers from is: —

A

Myopia

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
57
Q

●Energy in reflected light:—

A

increases with increase inangle

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
58
Q

●Which colour of light shows maximum deviationwhen passed through a prism? —

A

Violet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
59
Q

●When a light wave is reflected from a mirror, there isa change in its: —

A

Amplitude

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
60
Q

●Which type of mirror is used in the head lights ofvehicles?—

A

Concave mirror

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
61
Q

●Shaving mirror is: —

A

Concave

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
62
Q

●Magnifying glass is basically a: —

A

Convex lens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
63
Q

●White clothes are cooler than black ones becausethey:—

A

reflect all the light that reaches them

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
64
Q

●The primary colours in photography are:—

A

Red,Blue, Yellow

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
65
Q

●A concave lens always forms: —

A

a virtual image

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
66
Q

●A water tank appears shallow when it is viewed fromtop due to:—

A

refraction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
67
Q

●For a ray of light to suffer total internal reflection, ithas to pass from: —

A

air to water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
68
Q

●When air rises, it is cooled by: —

A

Expansion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
69
Q

●Collision of metal atoms with each other releases:—

A

Heat energy

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
70
Q

●The temperature of a metal wire ____ ,when anelectric current is passed through it. —

A

Rises

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
71
Q

●Low temperatures (cryogenics) find application in:—

A

Space travel, surgery and magnetic levitation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
72
Q

●A stick is dipped in water in a slanting position. Ifobserved sideways, the stick appears:—

A

Short andbent at the surface of water.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
73
Q

●A piece of copper and a piece of glass are heated tothe same temperature. When touched, thereafter,:—

A

the copper piece appears hotter than the glasspiece.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
74
Q

●The boiling point of ____ decreases as the amplitudeincreases. —

A

Water

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
75
Q

●When water is heated from 0 degree celsius to 10degree celsius, its volume:—

A

first increases andthen decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
76
Q

●A hollow sphere of radius R, a hollow cube of side Rand a thin circular plate of radius R, made up ofthe same material, are all heated to 200 C aboveroom temperature. When left to cool in the room,which of them will reach the room temperaturefirst? —

A

Sphere

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
77
Q

●With the increase of temperature, the viscosity ofglycerine:—

A

Increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
78
Q

●On a cold day when a room temperature is 150 C, themetallic cap of a pen becomes much colder thanits plastic body, though both are at the sametemperature of 150 C, because:—

A

metals are goodconductor of heat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
79
Q

●When a ring of metal is heated what happens to itshole?—

A

It expands

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
80
Q

●When heated from 0 degree to 10 degree celsius, thevolume of a given mass of water will:—

A

Decreaseand then will increase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
81
Q

●The best conductor of heat among the following is:—

A

Mercury

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
82
Q

●Clear nights are colder than cloudy nights because of:—

A

Radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
83
Q

●A gas thermometer is more sensitive than a liquidthermometer because a gas: —

A

Is easy to obtain

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
84
Q

●The metal used for the manufacture of heatingelements provided in electric iron is —

A

Nichrome

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
85
Q

●’Cryogenics’ is a science dealing with: —

A

Lowtemperatures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
86
Q

●If the temperature of a place increases suddenly, therelative humidity: —

A

Decreases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
87
Q

●Why two thin shirts can keep us warmer than a singlethick shirt in winter?—

A

Air layer between twoshirts behaves like insulating media

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
88
Q

●What changes will happen to a bowl of ice and waterkept at exactly zero degree celsius? —

A

No changewill happen

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
89
Q

●Curie point is the temperature at which:—

A

A metalloses magnetic properties

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
90
Q

●Cloudy nights are warmer compared nights becauseclouds mainly:—

A

reflect back the heat given byearth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
91
Q

●A metal plate with a circular hole at the centre isheated. What will happen to the area of the hole?—

A

Increase

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
92
Q

●Lakes freeze in cold countries in winter, leaving thewater underneath at: —

A

4 degree celsius

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
93
Q

●Refrigeration is a process which:—

A

slows down thebacterial growth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
94
Q

●Air coolers are more suitable for: —

A

hot and dryclimate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
95
Q

●When hot-water is sprinkled on a hotter glasstumbler, it breaks because: —

A

glass suddenlycontracts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
96
Q

●If there is a circular hole in a metal plate, whathappens to the radius of the hole when the plate isheated?—

A

It increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
97
Q

●Mud houses are cooler in summers and warmer inwinters as compared to brick houses because:—

A

Mud is a bad conductor

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
98
Q

●In heating frozen foods in sealed pouches inmicrowaves, why do you first poke holes in thepouch? —

A

To prevent the steam pressures frombursting open the pouch

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
99
Q

●Steam at 1000 Celsius causes more severe burns thanwater at 1000 Celsius because:—

A

Steam has latentheat of vaporization

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
100
Q

●During the hot weather, the fan produces a feeling ofcomfort. This is because: —

A

our perspirationevaporates rapidly

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
101
Q

●In a diesel engine, the high temperature needed toignite the fuel is achieved by: —

A

compressing airin the cylinders

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
102
Q

●How much mechanical work must be done tocompletely melt 1 gram of ice at 00 celsius? —

A

80J

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
103
Q

●Heat stored in water vapour is: —

A

Latent Heat

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
104
Q

●A copper disc has a hole. If the disc is heated, the sizeof the hole: —

A

increases

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
105
Q

●Water boils at a lower temperature in the hillsbecause: —

A

there is a decrease in air pressure onthe hills

106
Q

●The temperature which has the same reading on bothFahrenheit and Celsius scales, is: —

A

Minus 40degree celsius

107
Q

●A body absorbs heat most if it is: —

A

black and rough

108
Q

●The temperature of boiling water in a steam enginemay be high because of: —

A

there is high pressureinside the boiler

109
Q

●The water from a hand pump is warm in winterbecause:—

A

The temperature inside the earth ishigher than the atmospheric temperature

110
Q

●Water is used in hot water bags because:—

A

It hashigh specific heat

111
Q

●Which device is used in D.C. circuits?—

A

Transformer

112
Q

●Domestic electrical wiring is basically a:—

A

parallelconnection

113
Q

●At the present level of technology available in India,solar energy can be conveniently used to: —

A

Supply hot water to residential buildings

114
Q

●A fuse is used in mains electric supply as a safetydevice. Which one of the following statementsabout the fuse is correct?—

A

It must have a lowmelting point

115
Q

●In a motor car battery, the voltage is usually: —

A

12 V

116
Q

●Fluorescent tubes are fitted with a choke. The chokecoil:—

A

Reduces current in the circuit

117
Q

●Two wires have their lengths, diameters andresistivity all in the ratio of 1:2. If the resistance ofthe thinner wire is 10 ohm, the resistance of thethicker wire is: —

A

10 ohm

118
Q

●The frequency of alternating voltage supplied is: —

A

50 Hz

119
Q

●What is the order of magnitude of electric resistanceof the human body (dry)? —

A

106 ohm

120
Q

●Basically domestic electric wiring is a:—

A

combinationof series and parallel connections

121
Q

Large transformers, when used for some time, becomevery hot and are cooled by circulating oil. Theheating of the transformer is due to: —

A

both theheating effect of current and hysteresis loss

122
Q

●Metals are good conductors of electricity because:—

A

They contain free electrons

123
Q

●Rectifiers are used to convert: —

A

Alternating currentto Direct current

124
Q

●Point A is at a lower electrical potential than point B.An electron between them on the line joining themwill:—

A

Move towards B

125
Q

●Suitable impurities are added to a semiconductordepending on its use. This is done in order to:—

A

increase its electrical conductivity

126
Q

●Substances which offer no resistance to the flow ofelectricity are known as: —

A

Superconductors

127
Q

●In which of the following industries is mica used as araw material? —

A

Electrical

128
Q

●One should not connect a number of electricalappliances to the same power socket because:—

A

this can damage the domestic wiring due tooverloading

129
Q

●Transformer is used to:—

A

Convert low A.C voltage tohigh voltage

130
Q

●Electrical energy can be easily and cheaply changedfrom one voltage to another by a ____ withoutmuch loss of energy.—

A

Transformer

131
Q

●The filament of electric bulb is generally made oftungsten because: —

A

melting point of tungsten ishigh

132
Q

●Which term is used to denote materials with a muchhigher conductivity than insulators but a muchlower conductivity than metals? —

A

Semiconductor

133
Q

●In electronics what comes under tank circuit?—

A

Capacity and inductance

134
Q

●The fundamental scientific principle in the operationof battery is: —

A

Dissociation of electrolytes

135
Q

●Good conductor of electricity is: —

A

Graphite

136
Q

●Electrostatic precipitator is used to control thepollution of:—

A

Thermal

137
Q

●When the main switch of the house is put off itdisconnects the: —

A

live wire and the neutral wire

138
Q

●A multimeter is used to measure:—

A

Current, Voltage,resistance

139
Q

●A device used for converting Alternating Currentinto Direct Current is called: —

A

Rectifier

140
Q

●The metal used to make lightning conductors is: —

A

Copper

141
Q

●Superconductors are those elements:—

A

whoseresistance falls almost to zero at very lowtemperatures

142
Q

●Alternating current is converted into direct currentby:—

A

Rectifier

143
Q

●Which of the following circuit elements is used to’block’ DC in an electronic circuit? —

A

Capacitance

144
Q

●The fuse in our domestic electric circuit melts whenthere is a high rise in: —

A

Current

145
Q

●The device used to change the speed of an electric fanis:—

A

Regulator

146
Q

●Pure water is bad conductor of electricity because itis:—

A

feebly ionized

147
Q

●When electricity is transmitted over long distances:—

A

There is less wastage of energy

148
Q

●Electric current in a metal wire is due to the flow of:—

A

Electrons

149
Q

●After long periods of use, a grey spot develops on theinside of a bulb. This is because: —

A

The tungstenfilament evaporates and collects there

150
Q

●Lightening is caused due to: —

A

electric discharge

151
Q

●The device which transfer the signal from lowresistance region to high resistance region is: —

A

Transistor

152
Q

●A bird sitting on a high tension electric wire does notget electrocuted because:—

A

it does not form aclosed path for the flow of current

153
Q

●If a copper wire is increased to double its length, itsresistance will become: —

A

Double

154
Q

●Superconductor is the conductor whose ___ is zero.—

A

Resistance

155
Q

●A device which is used to limit the current in anelectrical circuit is called: —

A

Fuse

156
Q

●The earth wire of a cable is connected to:—

A

the fuseof the appliance

157
Q

●Water cannot be used to extinguish fire caused byelectric current, because:—

A

it may causeelectrocution

158
Q

●The metal whose electrical conductivity is more, is:—

A

Silver

159
Q

●Moving electric charge produces: —

A

Magnetic field

160
Q

●The S.I. unit of electric charge is: —

A

Coulomb

161
Q

●The best material for the core of a transformer is:—

A

Soft iron

162
Q

●Metal tea pots have wooden handles because:—

A

itprevents electric shock

163
Q

●The best conductor of electricity among the folloiwngis :—

A

Silver

164
Q

●Electromagnetic theory was proposed by: —

A

Maxwell

165
Q

●Magnetism at the centre of a bar magnet is: —

A

Zero

166
Q

●When a vehicle passes TV reception gets distorted.This is because:—

A

Spark plug creates

167
Q

●Magnetism in materials is due to:—

A

Circular motionof electrons

168
Q

●In the process of magnetization of a bar:—

A

The entirebulk of the bar gets magnetized

169
Q

●The scientist who first sent electromagnetic waves todistant places is: —

A

Thomas Alva Edison

170
Q

●When a bar magnet is cut into two equal halves, thepole strength of each piece: —

A

Remains the same

171
Q

●In MRJ machine, which one of the following is used?—

A

Magnetic Wave

172
Q

●Tape Recorder should not be kept near which one ofthe following things? —

A

Magnet

173
Q

●The width of depletion layer of a P-N junction:—

A

isincreased under reverse bias

174
Q

●Modern movie songs released are the best in qualityof sound. The rich quality of sound is due to whichone of the following?—

A

Consists of manyharmonics

175
Q

●When the frequency distribution is normal:—

A

Mean,mode, and median are identical

176
Q

●For reproducing sound, a CD (Compact Disc) audioplayer uses a: —

A

Laser Beam

177
Q

●Which waves are produced by rapidly oscillatingelectrical current?—

A

Radio waves

178
Q

●To detect the over-speeding vehicles, police use theDoppler effect of reflected: —

A

Short radio waves

179
Q

●What is the term for the form of amplitude variationsin the transmitted signal due to atmosphere,industries etc?—

A

Noise

180
Q

●Which transmission of music is a very good qualitymusic because the atmospheric or man madenoises which are generally frequency variationscan do little harm?—

A

FM Transmission

181
Q

●Sound waves in air are: —

A

Longitudinal

182
Q

●RADAR is used for: —

A

detecting and locating theposition of objects such as aeroplanes

183
Q

●Sound of frequency below 20 Hz is called: —

A

Infrasonic

184
Q

●The melodious effect on our ear produces by thecombination of two or more notes of the modernpop songs is called:—

A

Concord

185
Q

●Sound travels with a different speed in media. Inwhat order does the velocity of sound increase inthese media?—

A

Air, Water and Iron

186
Q

●Sound travels at the fastest speed in: —

A

Steel

187
Q

●Sound produced at a point is heard by a person after5 second, while the same sound is heard byanother person after 6 seconds. If the speed ofsound is 300 m/s, what could be the maximum andminimum distances between the two persons?—

A

3.3 km, 0.30 km

188
Q

●Intensity of sound at a point is ____ its distance fromthe source. —

A

Inversely proportional to the squareof

189
Q

●Supersonic plane fly with the speed:—

A

greater thanthe speed of sound

190
Q

●Mach number is used in connection with the speed of:—

A

aircraft

191
Q

●Intensity of sound has an: —

A

Object existence

192
Q

●What is found in frequency modulation?—

A

Fixedfrequency

193
Q

●Two waves each of amplitude 1.5 mm and frequency10 Hz are travelling in opposite direction with a speed of 20 mm/s. Thedistance in mm between adjacent nodes is: —

A

1.0

194
Q

●A person standing on a railway platform listens to thewhistles of arriving and departing trains. Thewhistle heard is:—

A

of higher pitch when trainarrives

195
Q

●Why are we able to hear short wave broadcasts in abetter way than long wave broadcasts?—

A

Shortwaves are more energetic than long waves

196
Q

●Longitudinal waves cannot travel through: —

A

Vacuum

197
Q

●Submerged objects can be located using: —

A

SONAR

198
Q

●A decibel is: —

A

A measure of sound level

199
Q

●In a Laser (say neon laser) all the atoms emit the lightwaves of:—

A

Same frequency, same amplitude andsame phase

200
Q

●What is the full form of ‘AM’ regarding radiobroadcasting?—

A

Amplitude Modulation

201
Q

●The propagation of sound waves in a gas involves: —

A

Adiabatic compression and rarefaction

202
Q

●If input frequency of a full wave rectifier be n, thenoutput frequency would be: —

A

2n

203
Q

●Noise is measured in: —

A

Decibel

204
Q

●The bats can fly in the dark because:—

A

they generateultrasonic sound waves

205
Q

●The frequency of ultrasound wave is typically:—

A

Below 20 kHz

206
Q

●The sound produced by a bat is: —

A

Ultrasonic

207
Q

●The sounds having a frequency of 20 Hertz to 20,000Hertz are known as: —

A

Audible sounds

208
Q

●When a vibrating tuning fork is placed on a table, aloud sound is heard. This is due to: —

A

Forcedvibrations

209
Q

●The distance between node and adjacent anti-node is30 cm, the wavelength is: —

A

60 cm

210
Q

●The velocity of sound in air:—

A

decreases withdecrease of temperature

211
Q

●The audio signals of TV are: —

A

Frequency modulated

212
Q

●To measure the speed of an approaching car, a policeofficer shines: —

A

radio waves on it

213
Q

●Waves that are required for long distance wirelesscommunication are: —

A

Radio waves

214
Q

●These waves cannot be transmitted through vacuum:—

A

Sound

215
Q

●Speed of sound in air is unaffected by change in:—

A

Pressure

216
Q

●Negative feedback in amplifiers:—

A

increasesbandwidth and decrease noise

217
Q

●Permissible noise level at Residential area duringnight time is:—

A

45 dB (A)

218
Q

●The pitch of sound depends on its:—

A

Frequency

219
Q

●The technique used to transmit audio signals intelevision broadcasts: —

A

Frequency Modulation

220
Q

●When the same note is played on a sitar and a flute,the sound produced can be distinguished fromeach other because of the difference in: —

A

Qualityonly

221
Q

●The distance between two consecutive crests in awave train produced in a string is 5 cm. If 2complete waves pass through any point persecond, the velocity of the wave is:—

A

10 cm/sec

222
Q

●The speed of a wave in a medium is 760 m/s. If 3600waves are passing through a point, in the mediumin 2 minutes, then its wavelength is: —

A

25.3 m

223
Q

●The number of waves contained in unit length of themedium is called: —

A

Wave Number

224
Q

●The frequency of a sound wave is n and its velocity isv. If the frequency is increased to 4n the velocity ofthe wave will be:—

A

v

225
Q

●When sound waves travel from air to water, which ofthe following remains constant? —

A

Frequency

226
Q

●Sound waves have the following frequencies that areaudible to human beings: —

A

5000 c/s

227
Q

●It is possible to distinguish between the transverseand longitudinal waves by studying the propertyof: —

A

Polarization

228
Q

●A pulse or a wave train travels along a stretchedstring and reaches the fixed end of the string. Itwill be reflected back with: —

A

A phase change of180° with velocity reversed

229
Q

●A medium can carry a longitudinal wave because ithas the property of: —

A

Elasticity

230
Q

●The waves in which the particles of the mediumvibrate in a direction perpendicular to thedirection of wave motion is known as: —

A

Transverse Wave

231
Q

●The type of waves that can be propagated throughsolid is:—

A

Transverse and Longitudinal

232
Q

●A tuning fork produces waves in a medium. If thetemperature of the medium changes, then whichof the following will change? —

A

Wavelength

233
Q

●A travelling wave passes a point of observation. Atthis point, the time interval between successivecrests is 0.2 seconds and the frequency is: —

A

5 Hz

234
Q

●Which one among the following lasers is used incancer treatment? —

A

CO2 laser

235
Q

●A simple machine helps a person in doing:—

A

thesame amount of work with lesser force

236
Q

●The working principle of a washing a machine is:—

A

Centrifugation

237
Q

●The working principle of a washing machine is:—

A

Centrifugation

238
Q

●Cryogenic engines find application in: —

A

RocketTechnology

239
Q

●The working of the quartz crystal in the watch isbased on the:—

A

Piezo-Electric Effect

240
Q

●The instrument that measures and records therelative humidity of air is: —

A

Hygrometer

241
Q

●Instrument used to measure the force and velocity ofthe wind is: —

A

Anemometer

242
Q

●Which of the following is used for accuratelymeasuring very small time intervals? —

A

Atomicclocks

243
Q

●The instrument for measuring intensity ofearthquakes is called: —

A

Seismograph

244
Q

●The instrument used to measure the speed of thewind is:—

A

Anemometer

245
Q

●Bolometer is used to measure: —

A

Temperature

246
Q

●A new technology which provides the ability to createan artificial world and have people interact with itis called:—

A

Virtual Reality

247
Q

●The material used in the fabrication of a transistor is:—

A

Silicon

248
Q

●The device which converts sound energy intoelectrical energy is called: —

A

Microphone

249
Q

●A Photostat machine works on: —

A

electrostatic imagemaking

250
Q

●Forged documents are detected by:—

A

Ultra-violetrays

251
Q

●The important unit of a microprocessor is:—

A

ALU,array of registers and control unit

252
Q

●Flight Recorder is technically called: —

A

Black Box

253
Q

●An instrument is used to measure humidity is:—

A

Hygrometer

254
Q

●An instrument that records earthquakes is:—

A

Seismograph

255
Q

●Electrostatic precipitator is used to control:—

A

Airpollutants

256
Q

●Velocity of sound in air does not depend on:—

A

Pressure of air

257
Q

●Glass can be etched or scratched by:—

A

Diamond andHydrofluoric Acid

258
Q

●What is fast becoming a very important field ofactivity in India? —

A

Information technology

259
Q

●The correctly matched lists are: — High Speed:Mach; Wavelength:

A

Angstrom; Pressure: Pascal;and Energy: Joule

260
Q

●What is the term for a plastic card with an embeddedmicrochip? —

A

Smart Card

TRAIN-WAY (27 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions