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GENERALSCIENCE

UNITS & MEASUREMENT-II

PHYSICS

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UNITS & MEASUREMENT-II

PHYSICS

The astronomical unit(AU) is a unit oflength, roughly thedistance from Earthto the Sun and equalto about 150 millionkilometres.

खगोलीय इकाई (AU)दरूी नापने की एकइकाई है, जो पथृ्वी सेसयूय की लगभग 150मिमलयन ककलोिीटरदरूी के बराबर है।

IMPORTANT PRACTICAL UNITSAstronomical Unit (AU)

IMPORTANT PRACTICAL UNITSLight Year

It is the distance travelled by the light invacuum in one year.यह एक वर्य िें प्रकाश द्वारा ननवायत िें तयकी गई दरूी है।

IMPORTANT PRACTICAL UNITS

• The parsec (symbol: pc) is a unit of lengthused to measure the large distances toastronomical objects outside the SolarSystem.

• पासेक (प्रतीक: pc) दरूी नापने की एकइकाई है जजसका उपयोग सौर िडंल केबाहर खगोलीय पपडंों की अधिक लबंी दरूीको िापने के मलए ककया जाता है।

1 Parsec = 3.1 × 1016m = 3.26 ly

Units of mass/ द्रव्यिान के िात्रक

1 िीट्रिक टन/ metric ton = 1000 ककलोग्राि

1 औसं/ 1 ounce = 28.35 ग्राि1 पाउण्ड/ 1 pound = 16 औसं = 453.52 ग्राि

1 ज्वंटल/ 1 quintal = 100 ककलोग्राि

Units of Length /लम्बाई के िात्रक

1 इंच / inch = 2.54 cm

1 याडय / 1 yard = 36 inch1 फुट/ Foot = 12 inch

1 िील/ 1 mile = 1760 yards

Units of area /क्षेत्रफल के िात्रक

1 वगय ककलोिीटर/ 1 Km2 = 100 हे्टेयर

1 एकड़/ Acre = 4840 वगय गज= 43560 वगय फुट1 हे्टेयर/ hectare = 2.5 एकड़

1 वगय िील/ = 2.6 वगय ककलोिीटर= 256 हे्टेयर

Altimeter

Measuring instrumentिापक यंत्र

Measures altitude (Used In Aircraft )

उड़ते हुए पविान की ऊँचाई

Measures strength of electric current

पवद्यतू िारा

Ammeter Barometer

atmospheric pressure

वायिुण् डलीय दाब

Anemometer

velocity of Wind and directions

वाय ुकी गनत

Fathometer

Measuring instrumentिापक यंत्र

depth of the ocean Measures electric current

Galvanometer Hygrometer

level of humidity

Hydrometer

relative density of liquids

Manometer

Measuring instrumentिापक यंत्र

pressure of gases To obtain a magnified view of small objects

Microscope Stethoscope

used by doctors to hear and analyze heart and lung sounds

Sphygmometer

Measures Blood-Pressure

Tachometer

Measuring instrumentिापक यंत्र

rotational speed of a shaft

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A. Newton / न् यूटनB. Candela / कैजण्डला C. Lux / ल् स D. Napier / नेपपयर

The unit of luminous intensity is -ज् योनत तीव्रता का िात्रक है-

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A. 1000B. 1,00,000C. 10,00,000D. 1,00,00,000

How many millimeters are there in a kilometer?एक ककलोिीटर िें ककतने मिलीिीटर होत ेहै?

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A. 10–18 mB. 10–15 mC. 10–12 mD. 10–6 m

1 famto is equal to-1 फैिटो बराबर होता है-

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A. 10–6

B. 10–2

C. 10–4

D. None of these

1 μ िीटर = ______ सेिी०।

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A. 100 mmB. 1000 mmC. 0.01 mmD. 0.001 mm

What is one micron equal to?एक िाइक्रोन ककसके बराबर होता है?

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A. Barometer / बैरोिीटर B. Ammeter / ऐिीटर C. Voltmeter / वोल् टिापी D. Galvanometer / गैल् वेनोिीटर

The device used to measure potential difference is known as-पवभवान् तर िापने के मलए प्रयफकत युज्त को जाना जाता है-

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A. Frequency / आवपृि B. Wavelength / तरंगदैध्य र C. Time period / आवतय काल D. Time / सिय

What does Angstrom measure?एंगस्ट िाि ् या िापता है?

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A. Temperature / तापक्रि B. Flow / प्रवाह C. Pressure / दाब D. Speed / चाल

The tachometer is the device with which to measureटैकोिीटर वह उपकरण है जजससे िापा जाता है-

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A. Wind direction / पवन की ट्रदशा B. Wind velocity / पवन का वेग C. Wind pressure gradient / पवन की दाब प्रवणता D. Wind speed and force / पवन की गनत एवं बल

Anemometer is used in measuring -एनीिोिीटर का उपयोग िापने िें ककया जाता है -

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