450+ Physics Questions In English For Railway , SSC , Police and All Competitive Exams

450+ Physics Questions_English

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?

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

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