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4

When temperature decreases, resistance of metals to flow of electricity

A. increases

B. decreases

C. neither increases nor decreases

D. first increases then decreases

Correct Answer :

B. decreases


Related Questions

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A bolometer is used to measure

A. the quantity of heat energy in a body

B. thermal radiations quantitatively

C. high temperature

D. the intensity of sound

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4

The Indian Space Research Organisation (ISRO) is located at

A. Thumba

B. Bangalore

C. Ahmedabad

D. New Delhi

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The sun continuously produces an enormous amount of energy. This is due to

A. nuclear fission

B. nuclear fusion

C. chemical combustion

D. boiling

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4

The temperature, surface features, length of days and nights of a planet depend on

A. its atmosphere

B. its distance from the sun

C. its rotation

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

If an empty cylinder Is half ruled with a liquid, Its centre of gravity is

A. shifted upwards

B. shifted downwards

C. shifted neither upward nor downward

D. shifted upward or downward depending on the density of the liquid

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4

A cyclist leans inwards when he is negotiating a curve 10 that

A. he may increase his speed

B. his weight may be reduced

C. necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion

D. no frictional force may be produced between the wheels and the axle

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4

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

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4

The phenomenon of radioactivity was discovered by

A. Rutherford

B. Bohr

C. Henri Bacquerel

D. Marie Curie

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4

Echoes are produced by

A. the reflection of sound waves

B. the refraction of sound waves

C. the interference of sound waves

D. reverberation of sound waves

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4

The speed at which light travels in vacuum is

A. 3 x 107 ms-1

B. 5 x 108 ms-1

C. 3 x 104 kms-1

D. 3 x 108 ms-1

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4

For viewing objects placed at a higher level from a position at a lower level, the instrument used' Is known aa

A. telescope

B. spectrometer

C. microscope

D. periscope

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4

A spherical mirror is

A. a reflecting elliptical portion

B. a reflecting spherical surface

C. a parabolic reflecting surface

D. a flat reflecting surface

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4

The escape velocity of a satellite projected from the surface of the earth is independent of

A. the mass of earth

B. the mass of the satellite

C. the radius of the earth

D. gravitation of the earth

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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 nuclear model of atom was first visualised by

A. Rutherford

B. Neils Bohr

C. Albert Einstein

D. JJ Thompson

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4

For accurate scientific work, temperatures are often measured by

A. mercury thermometers

B. alcohol thermometers

C. platinum resistance thermometers

D. thermoelectric thermometers

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4

When are temperature resistance

A. increases

B. decreases

C. remains the same

D. first increases then decreases

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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

In experiments on static electricity the standard method for obtaining small amounts of positive electricity is to rub

A. a glass rod with flannel

B. an abonite rod with flannel

C. a glass rod with silk

D. Any of the above

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4

The SI unit of electric current is

A. the ampere

B. the volt

C. the ohm

D. the coulomb

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4

A thermostat is a device used

A. for automatically maintaining a steady temperature

B. for measuring electricity

C. to reduce the voltage of electricity

D. for producing heat

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4

We cannot see and without the aid of a telescope

A. Neptune and Pluto

B. Jupiter and Saturn

C. Venus and Mars

D. Venus and Saturn

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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

Halley's comet appears in the heavens once in

A. 40 years

B. 50 years

C. 76 years

D. 80 years

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4

The number of galaxies that are visible without telescope on clear dark nights and away from bright lights is

A. one

B. two

C. three

D. infinite

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4

When one enters a dark room after being in bright light one is not able to see anything clearly for a while because

A. the retina of the eye moves forward

B. the retina of the eye moves backward

C. c).the iris is unable to dilate the pupil immediately to be able to see things

D. the eye has no power of accommodation

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4

The electron has a mass equal to

A. 1.9 x 10-13 kg

B. 9.1 x 10-31 kg

C. 1 x 10-15 kg

D. 1.6 x 10-19 kg

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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

When the disturbed electrons of an exited atom transfer back into lower energy levels they emit energy in the form of electromagnetic wave pulses called

A. neutrons

B. electrons

C. phonons

D. photons