Which instrument used for finding out wind-direction?wind vane
Why is ‘Beaufort Scale’ used?To measure wind velocity
What denotes the smallest temperature?1° on the Kelvin scale
A temperature at which both the Fahrenheit and the centigrade scales have the same value?-40°
Angular separation between two colours of the spectrum depends upon which thing?Angle of deviation
Total internal reflection of light is possible when light enters from which thing?Water to air
What is a suitable unit for expressing electric field strength?N/C
The unidirectional property of a pn-junction is useful for its use as which thing?Rectifier
Thermal decomposition of alkanes is known as which name?Cracking
Which energy of the electron at absolute zero is called?Fermi energy
What is the wavelength of visible spectrum?3900-7600 A
We cannot see during a fog. why?Because of scattering of light
What is meant by ‘Underwriting’, the term frequently used in financial sector?Under valuation of the assets.
What will be If a pendulum clock be taken from the earth to a revolving artificial satellite?It will stop altogether
Which physical quantities have the same dimensions?Momentum and impulse
What is the situation with increasing unemployment and inflation termed?Stagflation
Who firstly demonstrated experimentally the existence of electromagnetic wave?Hertz
Heating pyrites in air to remove sulphur is known as which name?Roasting
By which impact is Nuclear fission is caused?Neutron
Comets revolve around which body?Sun
Which layer of the earth is believed to have the heaviest mineral materials of highest density?Central core
When milk is churned, how does the cream separate from it?Due to the centrifugal force
Sound travels faster in which thing?Iron than in air
Which reflects back more sunlight as compared to other three?Land covered with fresh snow
What minimum number of non-zero non-collinear vectors is required to produce a zero vector?3
Which mirror is to be used to obtain a parallel beam of light from a small lamp?Concave mirror
If the temperature of a semiconductor rises, what is its resistivity?Decrease
‘mho’ is the unit of which unit?Specificresistance
In which type of climate does the temperature never rise above 10°C throughout the year?Tundra Climate
What is the product of the time period of a wave and its frequency?Unity
What is the name of the scientist who stated that matter can be converted into energy?Einstein
Einstein’s mass energy relation is given by which expression?E = mc2
What type of farming is practised in the densely populated regions of the world?Intensive farming
By which fission does Leishmania, the causative agent of kala-azar, multiply asexually?By binary fission
The filament of an electric bulb is made of which metal?Tungsten
If the temperature inside a room is increased, what will be the relative humidity?Decrease
Which proper order of seismic waves as they are received at seismograph station?P-wave, S-wave, L- wave
What is the relative permeability of a paramagnetic material?Greater than unity
On planet Earth, where is no centrifugal force?At the Poles
By whom was Electron first identified?J. J. Thomson
How must be the The lines of force of a uniform magnetic field?Parallel to each other
When a ray of light is going from one medium to another, how is its frequency changes?Frequency remains same
Heat given to an ideal gas under isothermal conditions is used in which work?In doing external work
When will a hot body radiate maximum energy?If its surface is black and rough
A far-sighted person has a near point at 100 cm. What must be the power of the correcting lens?+3.0 D
How many image can a man see if he stands between two plane mirrors inclined at an angle of 60°?5
Which rays can pass through 20 cm thickness of steel?ã-rays
Mesons are found in which rays?Cosmic rays
Why can Insects move on the surface of water without sinking?Due to Surface tension of water
According to Dalton’s atomic theory, which is the smallest particle which can exist independently?An atom
Who firstly predicated the existence of electromagnetic waves?Maxwell
The intensity of a magnetic field is defined as the force experienced by which pole?Unit north pole
In which process, a nucleus spontaneously breaks down by emitting radiation?Radioactive decay
Fluorescent tubes are fitted with a choke. What does the choke coil?Reduces current in the circuit
For television broadcasting, what frequency is employed normally?30 – 300 MHz
Which effect shows particle nature of light?Photoelectric effect
Activated charcoal is employed to remove colouring matter from pure substance, it work?Adsorption
Optic fibres are mainly used for which purpose?Communication
Which rays are most penetrating?gama-rays
Which common devices works on the basis of the principle of mutual induction?Transformer
Which is the process in which no heat enters or leaves?Adiabatic
By which permeabilty is a super conductor characterised?Zero permeability
How is the speed of light with the rise in the temperature of the medium?Remains unaltered
Pitch of the voice of women generally–Higher than that of men
When do all the magnetic materials lose their magnetic properties?Strongly heated
A hollow sphere of copper is positively charged, Then what will the electric field be inside the sphere?Zero
In our houses we get 220 V A. C What does the value 220 represent?Effective voltage
A small weight is put on the pressure cooker. It increases the pressure of the steam. Why?Area of contact is small
How can one can distinguish a telescope from a microscope?By observing size of the lens
Which type of sound is produced by a bat?Ultrasonic
Why does happen Short sightedness?Due to elongation of eye balls
The quality of sound produced by an instrument depends on the which thing?Number of overtones
What is the order of magnitude of electric resistance of the human body (dry)?106 ohm
In electric supply lines in India, which parameter is kept constant?Frequency (50 Hz)
The wavelength of X-rays is of the order of how many angstrom?1 Angstrom (1A0)
At the time of short-circuit, what will be the current in the circuit?Increases heavily
Radioactive distintegration of uranium ultimately results in which formation?Lead
‘Hydraulic brakes’ and ‘Hydraulic lift’ are devices, why are fluids used in them?For transmitting pressure
If a pendulum is allowed to oscillate into jar containing water, what will its time period?Increase
Instrument used to store the electric charge is known by which name?Capacitor
What does Every object at a temperature above absolute zero?Radiates energy
The value of which quantity remains same in all system of units?Specific gravity
A floating body always displaces liquid equal to its which thing?Weight
"When viewed in white light, why do soap bubbles show colours?Because of interference
"‘Parsec’ is the unit of measurement of which distance?Astronomical distance
The light coming from stars gives the idea of their which quality?Temperature
What is a strong argument for the particle nature of cathode rays?They are cast shadow
Which industry produces the most non-biodegradable wastes?Thermal power plants
What is the number of electrons in an atom of atomic number Z and mass number A?Z
Which was the lowest unit of Chola administration?Valanadu
When does Super conductivity result?When matter is cooled to very low temperature
When the temperature increases, what does the angle of contact of a liquid?Decreases
Which variety of glass is heat resistant?Pyrex glass
Why does the velocity of rain drop attain constant value?Viscous force exerted by air
If there were no atmosphere, what will be the length of the day on the earth?Decrease
The focal length of a convex lens is 50 cm. what is its power?+2 D
Which field is used to produce deflection in a television picture tube?A magnetic fields
If the Kinetic Energy of a body is increased by 300%, how much will its momentum increase?1
What does a permanent magnet repel?D i a m a g n e t i c substances only
If the price of an inferior good falls, what about its demand?Remains constant
A fan produces a feeling of comfort during hot weather. Why?Our perspiration evaporates rapidly
Why is the gas thermometers is more sensitive than the liquid thermometer?Expand more than liquids
Which is the correct device for the detection of thermal radiation?Thermopile
The pressure at the bottom of a liquid tank does not depend on which area?Area of the liquid surface
With the rise of temperature, what will be the surface tension of a liquid?Decreases
Total internal reflection can take place when light travels from which thing?Diamond to glass
The refractive index of a given piece of transparent quartz is greatest for which light?Violet light
Long distance short-wave radio broad casting uses which waves?Ionospheric wave
Recoil of a gun is an example of which thing?Conservation of linear momentum
The tendency of liquid drop to contract and why does it occupy minimum area?Due to Surface tension
When water is heated from 0 degree C to 20 degree C, how does its volume change?It shall increase
Folding is the result of which force?Orogenetic force
With which can Radio wave of constant amplitude be generated?Oscillator
What is the SI unit of Young’s modulus of elasticity?Newton/m2
If temperature rises, what will be the coefficient of viscosity of liquid?Decreases
To an observer on the lunar surface, during the day time, how will the sky appear?Black
What is Electromagnetic radiation with maximum wavelength?Radio waves
What is the unit of luminous efficiency of an electric bulb?Lumen / watt
What is the escape velocity of a particle of mass m varies?mo
What is the Mendel’s principles of inheritance?Sexual reproduction
Foucault experiment is proof of which body?Rotation of Earth
In which the radiant energy of the sun is transmitted?Short waves
When can one record the lowest temperature of air?Just before sunrise
What happens when the water content in the atmosphere?Decreases as temperature increases
What does the rusting of iron nail?Increases its weight
When light passes from air into glass it experiences change in which things?Wavelength and speed
Which types of light are strongly absorbed by plants?Blue and red
When two bodies stick together after the collision, what this is said?Completely inelastic
What is the quantity that remains unchanged in a transformer?Frequency
Why is In a hydel station the motion produced in turbines?Due to the flow of water
Which is useful in the detection of landmines?Wasp
Which instrument used to measure the force and velocity of the wind?Anemometer
What is most suitable for the core of an electromagnet?Soft iron
A convex mirror makes a good rear-view mirror for a car. Why?It forms erect, reduced images
For the measurement of temperature of the order of 400°C, what will we prefer?Thermocouple
If the current in the core decreases, what will the strength of the magnetic field be?Decreases
What is the commonly used unit for measuring the speed of data transmission?Bits per second
The change in temperature of a body is 50°C. What is the change on Kelvin scale?50 K
What is the amount of actual water vapour of air?Absolute humidity
How is Missile ‘Astra’?A air to air missile
What is Electric field intensity at a point a hollow charged spherical conductor?Is zero
With which instrument can a sailor in a submarine see the objects on the surface of sea?Periscope
At absolute zero temperature, what will be the kinetic energy of the molecules?Zero
Which is the instrument that measures air pressure?Barometer
By whom was the quantum theory first enunciated?By Max Planck
If a proton of mass m is moving with velocity of light, how will its mass?Unchanged
A hydrogen atom is paramagnetic. What is a hydrogen molecule?Diamagnetic
Which type of rainfall is often accompanied with lightning and thunder?Convectional
What is the approximate velocity of light per second?3 × 108 m
Why are Clear nights cooler than cloudy nights?Because of radiation
What is the growth movement in plant due to light called?Phototropism
Which Indian missile is capable of carrying nuclear weapons?Prithvi
Which Scientists has established the ‘Phylum Annelida’?Lamark
Why are Clear nights colder than cloudy nights?Because of Radiation
Which was India’s first-ever tactical missile?Agni
If a proton of mass m is moving with the velocity of light, what will its mass be?Infinite
Which is the example of ideal black body?A pin hole box
Which laser type is used in a laser printer?Dye laser
How much is one barrel of oil approximately equal to?159 litres
What is the energy of the winds and the waves?Kinetic
On which principle does Rocket work?Conservation of momentum
If the mass of the pendulum is doubled, what will its the time period?Remains same
Wireless communication is reflected back to the earth’s surface by the which zone?Ionsphere
Which are waves moving from a sitar to a listener in air?L o n g i t u d i n a l progressive
By whom are the planets are kept in motion in their respective orbits?Gravitation and centrifugal force
The hydraulic brakes used in automobiles is a direct application of which law?Pascal’s law
In which transmission are sound and video signals transmitted simultaneously?T.V. Transmission
Why is used as coolant in the radiator of a car engine?Because it has high specific heat
In India, who was the first to put forward the theory that the earth revolves round the sun?Aryabhatta
A metal sheet with circular hole is heated. what change will be in the hole?It will Expand
By inserting a soft iron piece into solenoid, what does the strength of the magnetic field?Increase
How is the electric potential at the centre of a charged conductor?Same as on the surface
Who invented the laser?Charles H. Townes
Which alloys is used for making magnets?Alnico
One calorie is the heat required to raise the temperature of 1g of water by how many degrees?1°C
What is the Mode of transmission of heat in which heat carried by a moving particles?Convection
Which electromagnetic radiation is most prevalent in the atmosphere?Infrared
Which scientist shared the Nobel Prize in Physics with his son?William Henry Bragg
The sun is visible a little before the actual sunrise because of which reaction?Atmospheric refraction
In nuclear fission, how many percentage of mass is converted into energy?0.001
Which property is processed by the ferromagnetic substance?Hysterasis
A car is running on a road at a uniform speed of 60 km/hr. What is the net resultant force on the car?Equal to zero
Critical criteria for the location of an aluminium plant in India are the availability of which things?Bauxite and electricity
How many electrons will have a charge of one coulomb?6.25 × 1018e
Which quantity remains constant in a step-down transformer?Power
What is the approximate equatorial circumference of the earth?40,000 Km
Which forces is most powerful in determining movement of wind including its velocity?Pressure gradient force
What is the number of basic units in the International System of Units?7
If you swim one km, how many miles do you swim?0.62
The ratio of the inertial mass to gravitational mass is equal to which number?1
What is the most abundant element on the earth’s crust by weight?Oxygen
Where is the intensity of the earth’s gravitational field maximum?At the pole
By whom wwere the Saturn rings were discovered?Galileo
The refractive index of a piece of transparent quartz is the greatest for which light?Violet light
Why is a water tank appears shallower when it is viewed from top?Due to Refraction
One horse power is equal to howmany watts?746 watts
How many image will be formed if two mirrors are fitted adjacent walls and one mirror on ceiling?7
Which are the materials that come out of a volcano at the time of eruption?Solid, liquid, gaseous
What is formed during Kerb’s cycle?Fumaric acid
In storms, the roofs of some houses are carried away. According whom is this?Bernoulli’s principle
Why is phenomenon of mirage?Due to total internal reflection
Which is the gas used to extinguish fire?Carbon dioxide
Which waves are used for a communication through artificial satellites?Microwaves
What is the temperature at which the speed of sound in air becomes double its value of 0°C?819°C
What is the vertical component of earth’s magnetic field?0°
The western disturbances which cause rain in north west India originate which sea?Mediterranean Sea
Territorial waters of India extends upto how many nautical miles?12
What is the ultimate cause of water movement in a plant stem against gravity?Osmosis
How can the quantity of water vapour the atmosphere hold increases?With increase of temperature
The focal length of the lens in a photographic camera is 5 cm. What is the power of the lens?+ 20 D
Which climatic region has the least temperature range?Equatorial region
Which instrument meant for measuring the rate of respiration?Respirometer
A substance, when inserted between the poles of a magnet, is pushed out, what is it?Diamagnetic
What is termed as the period of high inflation and low economic growth?Stagflation
How are the temperatures in equatorial regions between July and January?The same
The first explosion of an atomic device in India was carried out in which state?Rajasthan
The working of optical is based on which of electromagnetic waves?Total internal reflection
Where is the Monsoon effect is also experienced?East Africa
Who is the first person to conduct heart transplantation in India?Dr. Venugopal
What is an essential attribute of inflation?Increase in prices
In a compound microscope, how is the intermediate image?Real, inverted and magnified
By which can Foetus development in woman’s womb be ascertained?By Ultrasound
The famous bronze image of Nataraja is a fine example of which art?Chola art
Which is used as a material for making protective windows in space probes?Diamond
Which natural region is the best known for the production of grapes?Mediterranean
Which law is involved in the act of cleaning a carpet by beating it with a stick?First law of motion
Which is the country with the highest density?Singapore
Which is the unit of activity of a radioactive source?Becquerel
Medicines are more effective, if they are used in which state?Colloidal state
Where is the expression of earliest volcanic activity in India found?Dalmia hill
Who is associated with the development of India’s Atomic Bomb?Raja Ramanna
Kirchhoff’s voltage law is based on the law of conservation of which thing?Energy
In which country is Barail range located?India
In a sitar wire which type of vibration is produced?Stationary transverse
How is image formed on the retina of a human eye?Real and inverted
Which nontoxic gas helps in formation of enzymes which ripen fruit?Acetylene
Which continent has the highest density of population?Europe
What is the name of scale meant for recording weather condition?Fahrenheit
A convex lens of glass has power P in air. If it is immersed in water, what will be its power?Less than P
The internal secretion of which acid helps in digestion?Hydrochloric acid
When was decimal coinage introduced in India?1957
Which radiation carries maximum energy?Gamma-rays
The Laxman Era was started (in 1119 AD) by which dynasty?Sens
Water vapour is turned into water droplets by which process?Condensation
Mirage is observed in a desert due to the phenomenon of which reflection?Total reflection
AT which °C water has maxium densltv?4°C
Critical angle of light passing from glass to water is minimum for which colour?Violet colour
What amount of energy transfered from one trophic level to next?0.1
Which would expand the most on being heated?Air
A metal plate with a circular hole at the centre is heated. What will happen to the area of the hole?Decrease
What is the phenomenon of splitting white light into seven colours?Dispersion
Critical angle is minimum when a light ray passes which thing?Glass to air
What will be best colours for a Sun umbrella?White on top and black on inside
A virtual image larger than the object can be formed by which mirror?Concave mirror
Which substance is a bad conductor of electricity but a good conductor of heat?Mica
For an astronaut in a space ship, how does the sky appear?Black
What do we use in SONAR?Ultrasonic waves
A body has a mass of 6 kg on the Earth; when measured on the Moon, what would be its mas?6 kg
What is an example of emulsion?Milk
What is the cause of Exposure of rock to the changes of temperature?Mechanical weathering
Which type of glass can cut of ultraviolet rays?Crookes glass
Which phenomena can not be attributed to the refraction of light?Redshift
Which feature is the product of vulcancity?Atoll
How is the frequency of ultrasound wave typically?Above 20,000 kHz
With which name of the particle ‘Boson’ is associated?S. N. Bose
What is the frequency of a wave whose time-period is 0.05 second?20 Hz
Which is technique used to transmit audio signal in television broadcasts?Frequency modulation
Why does Kerosene oil rise up in the wick of lantern?Because of surface tension
What is Maximum value of the wavelength of ultrasonic waves?1.65 cm
If the density of water is 1 gcm-3 in C.G.S. System, what is its value in M.K.S. system?103 kg m-3
The highest temperature is achieved in which type furnance?Electric
What are the plants of tropical and sub-tropical regions called?Mesotherms
Which group have quantities that do not have the same dimension?Force, Impulse
Which is not electromagnetic in nature?Cathode rays
Which phenomena is used in optical fibres?Total internal reflection
If the earth were to skin faster, how does acceleration due to gravity at the poles?Remains the same
How do fogs formed along the sea-coast?Due to advection
Retina of the eye is comparable to which part of a traditional camera?Lens
Which physical quantity have the same dimensions?Work and torque
Which electromagnetic radiation has the smallest wavelength?Gamma rays
In which process the internal energy of a system remains constant?Isothermal
During adiabatic compression of a gas, what is the its temperature?Rises
Which physical quantities do not have same dimensions?Force and Pressure
If the momentum of a body is increased by 50%, how much will its K.E. will increase?1.25
What is the principle by which a cooling system (Radiator) in a motor car works?Convection
If an ideal gas is isothermally expanded, what will its internal energy?Remain the same
Which law of thermodynamics introduces the concept of entropy?Second law
If we move from the equator to a pole, what will be the value of g?Increases
By which force can fat be separated from milk in a cream separator?Centrifugal force
What does TV remote control unit use to operate a TV set?Radio waves
One astronomical unit is the average distance between which bodies?Earth and the Sun
Mac number is associated with which plane?Jet Plane
For a body moving with constant speed in a horizontal circle, what remains constant?KE (Kinetic Energy)
Independent alternation of generation is found in which plant?Fern
Which glass is used in bullet proof screens?Reinforced glass
Thermal radiations are electromagnetic wave belonging to which region?Infrared region
Which law directly explains the law of conservation of mass?Avogadro’s law
Which are the space waves are affected seriously by atmospheric conditions?UHF
Rutherford’s scattering experiment related to the size of which thing?Nucleus
What is the permissible level of noise in a silent zone at daytime?75 dB.
Why is Weightlessness experienced in spaceship?Due to absence of gravity
Which year is celebrated as International Year of Astronomy?2009
The Resistance of Human body (dry condition) is the order of –103 ohm
Newton’s Law of gravitation is defined by –Newton
What is the unit of electrical conductivity?Mho
Who discovered the link between electricity and magnetism?Michel Faraday
Chemical Energy is converted into Electric EnergyBattery
Tesla is the unit of Magnetic –Induction
The substance having infinite electric resistance are called –Insulator
What is the conductivity of super conductor?Infinite
What is the resistance of an ideal voltmeter?Infinite
Magnetic Keeper are the pieces of –Soft Iron
Not Gate can be operated by –Single transistor
The metal used in wires at domestic Level –Copper
During electro refining, Pure Metal is collected atCathode
A Conducting wire is –Neutral
The process of connecting of wires is called –Combination
In the resistance Colour code, the fourth band signifies –Tolerance level
Water should not be used to extinguish fire caused by Electricity, because –It may cause electrocution
Metal used for the manufacturing of Lighting conductor is –Copper
The negative Feedback in amplifier –Increase in band width in and decrease in noise.
Photoelectric cell converts –Light energy into Electric energy.
What is the working principle of solar cells?Photoelectric effect
In A.C. circuits A.C. meter measures –Rms value
SI Unit of electric charge is –Coulomb
Who discovered the battery?Volta
What is the unit of electric Power?Watt
Alternating current is converted into direct current by using –Rectifier
Fleming is Right Hand Rule is used to find the direction of –Induced Current
Instrument used to change the speed of Electric fan –Regulator
Best Liquid for the Transformer core is–Soft Iron
Transformer is used for –To increase the A.C. voltage
The filament of electric bulb is made up of–Tungsten
For the filament of electric bulb tungsten is used because–Its Melting point is very high
What is filled inside an electric bulb?Argon
A fuse wire can be indentify due to the properties–High Resistivity and minimum melting point
Intensity of Magnetic field is–Ampere/meter
The device which is used to store the electric charge is called–Capacitor
If the Length of a Resistance wire increase, then its resistance –increases
It a spoon is to be electroplated with nickel the spoon is.Made spoon cathode and pure nickel rod anode.
If a Magnet has third pole, then the third pole is called–consequent pole
Electrostatic Precipitator is used to control the –Air Pollution
Instruments can be shielded from the outside magnetic effect by surrounding them with–Rubber shield
The threshold frequency is the frequency below which–Photoelectric emission is not possible
Electron Microscope is more magnifier than light microscope because –Wavelength of electron is less than the wavelength of light
Primary colurs in a visual display unit are –Red, Green, Blue
Concave Lens always forms the image –Virtual and eject
Atomic clock transitions depends upon the –Cesium
What is a magnifying Lens?Concave lens with a small focal length
In Real Magnifying Lens is a –Convex lens
What is a Hologram?A3DShadowtoreproduce the Photographic Record
What is the working principle of periscope?Reflection
Strongest force in nature is –Nuclear Force
Optical fiber is based upon the principle –Total internal Reflection
Who invented the optical fiber?Narinder Kapany
What is the working principle of optical fiber?Total internal reflection
Sky appears to an astronaut–Black
Total internal reflection cannot occur, when light–From water to glass
Colour of sky is blue to –Scattering of shorter wavelength of sunlight in the atmosphere
The phenomenon related to the production of blue colour in the sky is–Scattering
Formation of Rainbow is due to –Refraction and Reflection of Light
The instrument used to see the distant objects on the earth is –Terrestrial Telescope
The pond appears shallower from its real depth due to –Refraction
A water tank appears Shallower when it is viewed from top due to –Refraction of Light
Which mirror is used as a rear view mirror in vehicles?Convex
Speed of Light is –3×108 m/s
Which type of energy transformation occours during Photosynthesis?Solar energy into Chemical Energy
Who invernted the Microscope?Jode Johmson
Light Waves are –electromagnetic wave
Lambert’s Law is related to –Illumination
Time taken by the Sun Light to reach at earth8.3 mint.
Ozone in outer atmosphere Helps us–In absorbing the Ultra violet radiations.
Distant objects are visible as a little out of focus in the condition:Myopia
What is a zoom lens?Alenswithatransitional focal length
Dioptre is the unit ofPower of lens
Near Point for Long sightedness defected person is–More than 25cm
Plate of Blue glass appears blue in sunlight because –transmits the blue colour
For total internal reflection, ray of Light Has to pass through –Glass to water
The word ‘Insolation’ means –Incoming solar radiation
Twinkling of stars is due to –Atmospheric Refraction
Light beam which is highly directional is called:Laser
Maximum biological damage occours due to –Gama Rays
To eliminate the glare of headlight in motorcars–Polaroid’s are used.
Light House are placed with powerful Lights to –Light House are placed with powerful Lights to–
1st Law of thermodynamics is normally related toLaw of conservation of energy
Why white cloths are cooler as compare to black cloths?They reflects the whole light
At the Highest value of black body radiations, it wavelength –Decreases with increasing temperature.
A white and smooth surface is –Bad absorber and good reflector of Heat.
Unit of plank’s constant is –JS
Heat of a Reaction does not depends upon –Physical state of product and Reactant
Soldering of two metals is possible due to the property–Cohesion
Freezing Point of Fresh water is00C
Lake Freeze in cold countries in winter, leaving the water underneath at –40F
Kilo watt – Hour is a unit of –Energy
Relative Humidity is Expressed in terms of –Percent
To produce the Low temperature which of the following principle is used. –A d i a b a t i c D e m a g n e t i z a t i o n Process
Rate of cooling depends upon which factor?Temperature difference between body and its surrounding
Refrigerator Protects the food from contamination because –At its Low temperature Bacteria and Fungus becomes non-reactive
Therm is the unit of –Heat
Why Boiling Point of water decrease with Altitude?Low atmospheric pressure
Density of water is 1G/CC. it is strictly valid at –40C
Why clouds are float in atmosphere?Low density
A real Gas can act as an ideal gas at –Low pressure and High temperature
Cryogenic Science is related to –Lower temperature
The Hottest part of Gas Flame is known as – [Non-luminous zone
To measure very High temperature we use –Thermo electric pyrometer
Minimum temperature is measure by –Alcohol Thermometer
Heat stored in water vapors is –Latent Heat
A Body absorb Maximum amount Heat, when it is–Black and Rough
Water is used in Heated water polyethenes because –Its specific Heat is more.
Temperature inversion is –Positive Lapse Rate
Ice is packed in sawdust because –Sawdust is a poor conductor of Heat.
When a stone is thrown is calm water of a pond wave produced are–Both Longitudinal and transverse waves
Ultra violet radiations has more energy as compare to –Infrared Rays
Time period of second pendulum is –2 sec
What is the motion which repeated in self after a regular interval of time?Simple Harmonic Motion
Ultraviolet rays can be used in water treatment as…Disinfectant
The device used for measuring the wavelength of X–rays is:Bragg Spectrometer
Who is the inventer of RADAR?N.H. Taylor and Lio C. young
RADAR is used toto detect and locate distant objects.
The danger signals are red while the eye is more sensitive to yellow because.The danger signals are red while the eye is more sensitive to yellow because.
A TV channel characterized by –Frequency of transmitted signal
Mechanical energy is countered into electrical energyMicrophone
Who discovered X-Rays?Roentgen
The process by which sunlight reaches to earth…..Radiation
The least penetrating power ray isα-rays
X-rays are waves.Electromagnetic
Which scale is used to measure the intensity of earthquake?Richter
The Unit of noise pollution (level) isdecibel
The use of Decibel unit is ……Intensity of sound
What is Decibel?Scale of sound level
Noise is measure in?Desible
The Permissible noise level at Residential area during time is45dB
The range of frequency of ultrasonic wave.Greater than 20 KHz
Wavelength of visible spectrum is –3900 A0 – 7600 A0
Supersonic air plane creates a shock wave calledSonic Boom
In a Filament type Light bulb most of the electric power consumed appear asInfrared rays
Pitch of a sound depends upon its –Frequency
What is the working principle of stethoscope?Reflection of Sound
Which instrument can be used to study the wave form of a signal?Oscilloscope
Which atmospheric Layer is used for the transmission of radio waves?Ionosphere
A body in uniform motion with uniform speed–May have uniform velocity
In Radio Communication, the signals emitted by transmitting antenna are reflected onIonosphere
The purpose of choke in a fluorescent lamp is –to decrease the flow of current
A person is Hurt on Kicking stone due to –Reaction
A cycle type bursts suddenly. This represent an –Isothermal Process
The apparent weight of a man in a lift is less than the real weight thenWhen the lift is going down with acceleration.
Lubricant oil is used in vehicle to –to decrease the friction
Flywheel is an important part of a steam engine becausehelps the engine in keeping speed uniform.
The spoon dropped by an astronaut in a satellite willContinue to flow the motion of satellite
Ball pen act on the principle of –Gravitation
According to special theory of relativity the mass of a particle –Increases with increase in velocity
Humidity is measured by –Hygrometer
Anemometer is used to measure–Speed of wind
Purity of Milk is measured by –Lactometer
Dimension of Universal Gravitational constant is –M–1L3T–2
The dimensional formula ML–1T–2 corresponds to –Modulus of Elasticity
When water freezes its density is –decreases
Cream gets separated out from milk when it is churned. This is due to–Centrifugal Force
Newton’s 1st law of motion gives the concept of –Inertia
What is the working principle of Rocket?Newton’s 3rd Law
For a missile Launched with A velocity Less than the escape velocity of earth, the total energy isNegative
Cooking of Rice is Harder –Top of Mountains
Water boils at low temperature on mountains because–Atmospheric pressure is less at mountains.
Rice is cooked more quickly in a pressure cooker because –water boils at Higher temperature.
Time period of Revolution for a Geo–stationary satellite is–24 Hours
What is the Height of a Geo-Stationary satellite from the surface of earth?36,000 km (nearly)
Water drop cannot stick to the oily surface due tolack of adhesive force
Why the rain drops acquired the spherical shape?Surface tension
A fountain pen works on the principle of–Capilarism
The part of transistor which is heavily doped to produce a large number of majority carriers is –Emitter
Energy stored in a spring in watch –Potential Energy
What should a person on a freely rotating turn able to decrease his angular speed?Spread his hand outward
What is the principle of Hydraulic Machines?Pascal
Electron in an atom contains total energy –Less than Zero
Mass Energy relation is a conclusion of – Theory of Relativity
Weight of a free falling body is –Zero
Rocket acts on Law of conservation of–Liner Momentum
Function of ball bearing in a wheel is –to convert kinetic friction into rolling friction