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4

At what temperature do the Fahrenheit and Celsius scales give the same reading?

A. 212°

B. 32°

C. -40°

D.

Correct Answer :

C. -40°


Related Questions

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Lightning is produced when

A. similar charges of electricity rush towards each other and then get repelled

B. clouds strike against impurities in air and the friction burns up these impurities

C. strong opposite charges in different clouds break down the resistance offered by the intervening air

D. water vapour produces electricity in the clouds

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4

Dioptre is the unit of power of

A. convex mirrors

B. concave mirrors

C. concave lenses

D. lenses irrespective of types

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An electric kettle used for boiling hard water has a white scale deposited on its heating element. This consists or

A. sugar

B. sodium carbonate

C. common salt

D. carbonates of calcium and magnesium

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4

The numerical reading of the Fahrenheit thermometer of a given temperature

A. is proportional to that of the Celsius thermometer

B. is always greater than that of the Celsius thermometer

C. is always less than that of the Celsius thermometer

D. may be greater than or less than or equal to that of the Celsius thermometer

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4

The maximum range of most TV signals is from 121 to 240 km only because

A. the curvature of earth limits the range of reception

B. the signals are weak

C. the signals are absorbed by air

D. the antennae are not powerful enough

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4

Which part of the eye photographic camera?

A. Lens

B. Iris

C. Retina

D. Eyelid

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4

The device for tracking and locating the position of a moving object in space is called

A. Space ship

B. Lunar module

C. Radar

D. Rocket

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A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

A. a parabola

B. a horizontal straight line

C. a vertical straight line

D. a circle

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4

The unit of heat energy is

A. watt

B. degree

C. joule

D. erg

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If you want a sound proof room, the walls should be

A. able to refract the sound

B. good absorbers of sound

C. good reflectors of sound

D. All the above

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4

A stone floor feels cold to the bare feet but a carpet on the same floor feels warm. This is because

A. the floor and carpet are at different temperatures

B. the stone conveys the heat away from the feet more rapidly than the carpet

C. the carpet is a better conductor of heat than the stone

D. the human body maintains a constant temperature

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4

A heavenly body similar in nature to the sun intensely hot glowing mass that produces its energy by thermonuclear reactions is

A. a planet

B. a meteor

C. a star

D. a comet

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If the speed of the rotation of the earth increases the weight of a body

A. will increase

B. will decrease

C. will have no change

D. will either increase or decrease

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Under similar conditions of temperature and pressure, the velocity of sound is maximum in

A. helium

B. argon

C. hydrogen

D. oxygen

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4

The Milky Way is

A. the path of a star which is nearest to the earth

B. a galaxy which includes the sun

C. a star that is nearest to the earth

D. None of these

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4

A rheostat is used

A. to increase the current flow in a circuit

B. to decrease the current flow

C. to measure the flow of electric current

D. Either (a) or (b) above

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4

Mercury does not stick to glass because

A. cohesive forces between the mercury molecules are greater than adhesive forces between mercury and glass molecules

B. the adhesive forces between mercury and glass molecules are greater than the cohesive forces

C. both the cohesive and adhesive forces are equal

D. None of the above

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4

The device that is used to measure the electromotive force of a cell is

A. an ammeter

B. a rheostat

C. a voltmeter

D. a voltameter

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4

When the velocity of a body is halved

A. its momentum is halved

B. its kinetic energy is halved

C. its acceleration is halved

D. its potential energy is halved

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4

The hygrometer is an apparatus used for finding the

A. temperature of air

B. intensity of light

C. density of a liquid

D. relative humidity of the atmosphere

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4

A car parked in the sun with its windows closed gets terribly hot inside. This is due to

A. the heat emitted by the engine

B. the greenhouse effect

C. the good conducting power of the metal body

D. the double layered wind shield

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4

Bats flying in the dark avoid obstacles because

A. they can see very dearly only in darkness

B. they produce ultrasonic waves which guide them

C. their eyes are sensitive to darkness

D. their eye holes expand in darkness

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4

Raindrops assume a spherical shape because or

A. adhesion

B. surface tension

C. gravitational force

D. atmospheric pressure from all sides

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4

The rate of cooling of a hot body depends on

A. the nature of the radiating surface

B. area of the radiating surface

C. temperature difference between the body and the surroundings

D. All the above

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4

A permanent magnet may be demagnetised by

A. placing it inside a solenoid through which an alternating current is flowing

B. heating the magnet to redness and then allowing it to cool

C. dropping it several times or hammering it while lying east-west

D. All the above

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4

A body has fallen from a height. Just before touching the pound it has

A. lost all its potential energy and gained an equivalent amount of kinetic energy

B. gained potential energy and lost kinetic energy

C. gained kinetic energy as well as potential energy

D. lost kinetic energy as well as potential energy

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The filament lamp is an example for

A. fluorescence

B. incandescence

C. both (a) and (b)

D. None of these

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The phenomenon of radioactivity was discovered by

A. Rutherford

B. Bohr

C. Henri Bacquerel

D. Marie Curie

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4

The base of an electric iron is brightly polished mainly

A. to make it smooth and frictionless

B. to make it rust - proof

C. to reduce heat loss by radiation

D. to make it more durable

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A lactometer is used to

A. find out the specific gravity of liquids

B. measure the volumes of liquids

C. test the purity of milk

D. determine the strength of acid in car batteries