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Physics > Measurements 8 > Flashcards

Measurements 8 Flashcards

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1
Q

Nautical mile

A

1852 miles

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2
Q

Conductance unit

A

Mho

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3
Q

1 cubic metre = how many lites

A

1000

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4
Q

1 bar = how many pascals

A

10*5

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5
Q

1 torr is equal to

A

1 mm of Hg

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6
Q

1 atm = how many pascals

A

1.013 x 10*5 pascals

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7
Q

1 atm = how many mm of Hg

A

760

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8
Q

1 Amstrong is how many meters

A

10*-10

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9
Q

Power S.I unit

A

Watt

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10
Q

Capacitance S.I. unit

A

Farad (F)

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11
Q

7 fundamental quantities

A

M E T2 A L2

M - Mass
E - Electric current
T - thermodynamic temperature
    - Time
A - Amount of substance
L - luminous intensity 
   - length
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12
Q

Magnetic flux unit

A

Weber (W)

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13
Q

Inductance unit

A

Henry (H)

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14
Q

Magnetic Induction unit

A

Tesla (T)

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15
Q

Unit of capacitance

A

Farads

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16
Q

In physics, the weber is the SI unit of magnetic flux. A flux density of one Wb/m2 (one weber per square metre) is one tesla.

A

Read

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17
Q

Electrostatic induction is an

A

Electrostatic influence

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18
Q

Kerosene relative density

A

.8

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19
Q

Mercury relative density

A

13.6

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20
Q

Glass relative density

A

2.5

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21
Q

Copper relative density

A

8.9

22
Q

Gold relative density

A

19.3

23
Q

Metre standard definition

A

Length of a platinum - iridium rod at 0°C in paris
Or
1/10 million of the distance from pole to the equator

24
Q

One kilogram definition

A

Mass of a certain lump of platinum - iridium in Paris

25
Q

One second definition

A

Time taken by a Celsius atom (133) to complete 9.1 billion vibrations (estimated)

26
Q

Least count of an instrument

A

Smallest measurement that the instrument can make accurately

27
Q

The error of we do not place our eyes directly in front of the scale u are measuring

A

Parallax error

28
Q

Vernier calliper is

A

An instrument used for measuring objects

29
Q

No of scales in vernier calliper

A

2
Main scale
Vernier scale which slides on the main scale

30
Q

Unit named after a scientist should not be

A

Written starting with a capital letter if full name is written

31
Q

Symbols for units never take

A

Plural form

32
Q

1 ATM in dynes / cm*2

A

1.013 x 10 raised to 6

33
Q

Radioactivity units

A

curie (Cu)

rutherford (Rd)

34
Q

Radioactivity of any substance is measured in

A

Disintegration per second

35
Q

1 rutherford (Rd) =

A

10*6 disintegration per second.

36
Q

1 curie (Cu) =

A

3.7 x 10*10

37
Q

1 horse power =

A

746 watt

38
Q

No of supplementary qty

A

2

39
Q

Supplementary qty

A

Plane angle - radian

Solid angle - steradian

40
Q

Radian vs degrees

A

Radian is SI unit

180° = 1 pie

41
Q

farad vs faraday

A

farad - unit of capacitance

faraday - unit of charge

42
Q

1 faraday equal to charge of

A

6.02 x 10*23 electrons ( Avogadro’s no )

43
Q

Electron volt

A

a unit of energy equal to the work done on an electron in accelerating it through a potential difference of one volt.

44
Q

Largest unit of mass

A

CSL

Chandra Shekhar limit

45
Q

1 CSL =

A

1.4 times the mass of sun

46
Q

Smallest unit of energy

A

Electron volt (e.v.)

47
Q

Biggest unit of charge =

A

Faraday

1 faraday = 96500 coulomb

48
Q

1 coulomb is the charge of

A

6.25 x 10*18

49
Q

Work =

A

Force x displacement x cos θ

where θ represents the angle between force applied and displacement

50
Q

Kilowatt per hour -

A

Unit of energy (kWh)

51
Q

No of ergs in 1 kWh

A

36 trillion

Physics (17 decks)

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