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In a refrigerator, the refrigerant is

A. Nitrogen

B. Oxygen

C. Chlorine

D. Freon

Correct Answer :

D. Freon


Related Questions

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Solids have definite shapes. This is because

A. the forces of cohesion of the molecules within are very much less in them

B. the forces of cohesion are very large

C. the forces of adhesion are large

D. the forces of adhesion are less

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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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Like magnetic poles

A. attract each other

B. repel each other

C. neither attract nor repel

D. attract or repel depending upon the conditions

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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 overhead wires supported by high towers in the grid system carry

A. alternating current of very high frequency

B. alternating current of very high voltage

C. a very large direct current

D. a high voltage direct current

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The source of electric energy in an artificial satellite is

A. mininuclear reactor

B. a dynamo

C. a thermopile

D. solar cells

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The period of a geostationary (synchronous) satellite orbiting the earth over the equator la

A. 16 hours

B. 12 hours

C. 20 hours

D. 24 hours

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The difference between planets and stars is

A. planets do not have light of their own whereas stars shine by their own light

B. planets do not twinkle like stars

C. planets are much smaller than stars

D. All the above

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Of the following types of electromagnetic radiation which has the longest wavelength?

A. ultraviolet rays

B. gamma rays

C. radio waves

D. infrared waves

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If an object is placed between two parallel plane mirrors, the number of images formed will be

A. 1

B. infinite

C. 0

D. 4

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The completely dark portion of a shadow of an object is known as

A. umbra

B. penumbra

C. image

D. black portion of light

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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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Commonly used safety fuse wire is made of

A. Tin

B. Lead

C. Nickel

D. An alloy of tin and lead

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The mixing up of two gases as a result of random motion of molecules is called

A. diffusion

B. effusion

C. vaporisation

D. sublimation

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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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Which of the following has the highest refractive index?

A. Crown glass

B. Water

C. Flint glass

D. Diamond

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Water has maximum density at

A. 0° C

B. -15° C

C. 4° C

D. 15° C

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Tea pots are highly polished

A. so that they may reflect thermal radiation from outside and minimise such radiation from them

B. so that they may absorb all radiation from outside

C. to make them attractive to look at

D. because they take high polish

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When a whistling engine approaches a person standing on the platform, the frequency or the note

A. appears to increase

B. appears to decrease

C. does not change at all

D. first increases then decreases

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Credit for starting Space Science Research in India goes to

A. HJ Bhabha

B. SS Bhatnagar

C. V Sarabhai

D. CV Raman

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What is the minimum velocity required for a rocket to overcome earth's gravity and travel into space?

A. 18 km/sec

B. 11.2 km/ sec

C. 21 km/ sec

D. 35 km/ sec

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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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Which of the following can produce electricity?

A. resistor

B. thermocouple

C. light bulb

D. neon tube

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The strength of an electromagnet can be increased by

A. increasing the length of the coiled wire

B. increasing current supply

C. increasing the size of the iron core

D. All the above

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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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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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The principle of equivalence of mass and energy was established by

A. Dalton

B. Rutherford

C. Einstein

D. Planck

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At temperature near OK, (zero kelvin) metals such as lead and tin become

A. insulators

B. semiconductors

C. superconductors

D. condenser

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A series of east moving still pictures can be made to appear as a moving picture because the eye

A. can focus very rapidly as pictures change

B. is quicker than the brain

C. can see two images separated only if the interval' between seeing them is more than' one-tenth of a second

D. can shut out some of the light

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A sensitive instrument susceptible to magnetic infiuence can be protected from external magnetic field by

A. enclosing it in a thick walled iron box

B. wrapping it with an insulator

C. by placing it inside a glass case

D. by surrounding it with fine copper gauze