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In a microphone

A. sound energy is converted into electrical energy

B. electrical energy is converted into sound energy

C. sound energy is converted into mechanical energy

D. mechanical energy is converted into sound energy

Correct Answer :

A. sound energy is converted into electrical energy


Related Questions

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When the earth reaches its perihelion

A. it is nearest to the moon

B. it is nearest to the sun

C. it is nearest to Pluto

D. it is farthest from the sun

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The leader of the team who succeeded in constructing the first nuclear reactor (an atomic pile) in the world was

A. Albert Einstein

B. Enrico Fermi

C. HJ Bhabha

D. Sir Isaac Newton

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4

In a freezer ice cubes will be formed more quickly in trays made of

A. rubber

B. plastic

C. aluminium

D. wood

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Atoms which have the same atomic number but different mass numbers are called

A. isobars

B. isomers

C. isotones

D. isotopes

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It is more difficult to walk on ice than on a concrete road because

A. there is very little friction between the ice and feet pressing it

B. ice is soft when compared to concrete

C. there is more friction between the ice and feet

D. None of the above

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Heat is transmitted from one end of a metal rod to its other end by the method of

A. conduction

B. convection

C. radiation

D. sublimation

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Thick brick walls are used in the construction or a cold storage because bricks

A. are good conductors of heat

B. are cheaper

C. are easily obtained

D. are bad conductors of heat

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The planet that is known as earth's twin is

A. Mercury

B. Venus

C. Moon

D. Mars

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The unit of heat energy is

A. watt

B. degree

C. joule

D. erg

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In the visible spectrum which colour has the shortest wavelength?

A. Red

B. Blue

C. Yellow

D. Violet

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4

Water kept in an earthen pot is less cool on rainy days than in summer because during the rainy days

A. the pores in the pot are closed

B. rain water stops oozing out from the pores

C. the water that oozes out does not evaporate quickly because of the large percentage of moisture in the air

D. surface of the pot becomes damp

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4

Which of the following wires of same dimensions offers least resistance to the ,flow of current?

A. copper

B. aluminium

C. silver

D. nichrome

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4

In the case of bodies falling under gravity which of the following remains constant at a given place?

A. kinetic energy

B. potential energy

C. acceleration

D. All the above

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Who first established the fact that the earth revolves round the sun?

A. Sir Isaac Newton

B. Kepler

C. Copernicus

D. Ptolemy

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When temperature decreases, resistance of metals to flow of electricity

A. increases

B. decreases

C. neither increases nor decreases

D. first increases then decreases

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On the Kelvin scale, the melting point of ice is

A. 0 K

B. 273 K

C. 373 K

D. 100 K

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The earth satellite Aryabhatta was put in orbit by India on

A. October 20, 1978

B. November 14, 1978

C. January 26, 1979

D. April 19, 1975

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Out of the following, name the fluorescent substance.

A. quinine sulphate solution

B. paraffin oil

C. fluorescein solutions

D. All the above

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The planet with the reddish tinge is

A. Jupiter

B. Mars

C. Mercury

D. Saturn

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One can be recognised by his voice alone due to the factor of

A. quality

B. amplitude

C. pitch

D. loudness

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How is it that Pluto is not always the farthest planet of the solar system?

A. Each planet becomes the farthest planet in its turn. Now it is the turn of Piuto

B. The Sun is now in the zodiac in which it is nearest to outer planets

C. The eccentricity of Piuto's orbit being substantial, this orbit cuts the orbit of Neptune

D. Piuto belongs to other solar system

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Which physical quantity is measured in watts

A. power

B. kinetic energy

C. momentum

D. impulse

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Changing of one element into another element is known as

A. transmutation

B. fission

C. fusion

D. radioactivity

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The direction of heat flow between two objects depends on

A. their heat contents

B. their masses

C. their temperatures

D. whether they are in solid, liquid or gaseous state

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The weight of a body is

A. maximum at the equator

B. minimum at the equator

C. minimum at the poles

D. the same everywhere

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Which part of the eye photographic camera?

A. Lens

B. Iris

C. Retina

D. Eyelid

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The focal length or lens or the eye is under the control or the

A. iris

B. pupil

C. ciliary body

D. cornea

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In the ramous equation of Einstein E = mc2 , 'c' denotes.

A. velocity of sound

B. velocity of light

C. a constant factor

D. wavelength of light

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The method used to separate aluminium from a alumina is

A. electroplating

B. electrotyping

C. electrolysis

D. distillation

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Sound waves in air are

A. transverse

B. longitudinal

C. transverse and longitudinal

D. neither transverse nor longitudinal