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Units And Measurements Flashcards

1
Q

How many fundamental quantities

A

7 which are independent fromnothers
Length m
Mass kg
Time s
Temperature k
Current amp
Luminous intensity candela
Mole of the substance mole

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2
Q

Supplemenyary physical quantities

A

Plain angle d teta circle
Arc length/ radius units radians
Solid angle d omega
Spehere area of the arc
Area of arc / radius square units steradian

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3
Q

Relationship bte degree and radian

A

180° = π radin
1 radina is equal to 57 °

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4
Q

System of units

A

System length mass time
Fps britis foot pound sec
Cgs metric fren 1957 centi gram sec
Mks/ si giorge 1971 metre kg sec

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5
Q

Decimeter

A

1/10 metre 100 cm is decimeter
1/100 metre centi 10 milli
1/1000 metre one milli

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6
Q

Micro meter/ micron

A

10 ^-6 one millionth metre
10^ -3 milli metres
One million 10 laqhs
One billion 100 crores

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7
Q

The size of polythene bags expressed in

A

Microns
The size of bacteria expressed in microns

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8
Q

Nano metre

A

10 ^ -9 mts
One billonth metre
One crore 7 zeros

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9
Q

Angstrom unit

A

10 ^-10 mts. 10 ^-8 cms
Atomic radius is measured by angstorm unit

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10
Q

Pico meter

A

1 pm = 10 ^ -12

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11
Q

1 Fermi

A

10 ^ -15 mts.
Nuclear reactor, radius of nucleaus of an atom is measured or expressed by fermi
Nick name of fermi smallest unit for measuring the distance

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12
Q

The largest unit for meausring the distance

A

Parsec
1 parsec = 3.26 light years.
Light year
The distance travelled by the light during one year is called light year
One light year 9.46 *10 ^ 12 kms
9.46 * 10 ^15 mts
6.33 *10 ^4 astronomical

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13
Q

Speed of the light in vaccum

A

3 lkh km per second
3 * 10 ^ 8 m / s
3* 10 ^ 5 km / s
186287 miles per second

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14
Q

Astronomical unit

A

The distance bt centre of the sun and centre of the earth is called astronomical unit
1 astronomical unit = 149.6 million km
15 crores km
1 million 10 lkh 6 zeros
1 crore 7 zeros
1 billion 100 crores 9 zeros
Ncert 1.496*10^11 mts

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15
Q

One mile

A

1.6 km 1600 mts

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16
Q

One nautical mile

A

1.8 kms
1852 mts
The surface of the sea expressed in nautical miles

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17
Q

One inch

A

2.54 cms
12 inch = 1 feet
1 yard = 3 feet
1 fathom= 6 feets
1.8288 mts

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18
Q

Fatho meter

A

Is used to measure the depth of the seas or oceans

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19
Q

Altimeter

A

To measure the height

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20
Q

1 cent

A

48 yard
1 acr= 4840 yards
1 hector = 2.5 acrs =10000 m2
100 ares

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21
Q

Irregular areas measured by

A

Graph

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22
Q

1 barrel

A

159 litres

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23
Q

1 gallon

A

4.54 litres
1 inch 2.54 cm

24
Q

Tmc

A

Thousand million cubic feets
Used for water storage capacity expressed in tmc in the reservoir

25
Q

Cusec

A

Cubic feets per second
The rate of flow of water expressed in cusec

26
Q

The volume of irregular objects measured using

A

Measuring cylinders

27
Q

Mass

A

Platinum + iridium France 1889 0 ° c

28
Q

One pound

A

453 gms.
Or 450

29
Q

One kg

A

2.2 pounds

30
Q

One table spoon

31
Q

One ounce

32
Q

Smallest unit for mass

A

Amu( atomic mass unit)
C12 /12 mass of carbon/12

33
Q

Largest unit for mass

A

Chandra sekhar limit
1.4 * mass of sun

34
Q

Mass of sun

35
Q

Mass of earth

36
Q

Mass of moon

A

7 * 10 ^22

37
Q

Conventions of masses

A

Milli centi deci gram deca hecta kilo

(-) ____________ _________________(+)

38
Q

Smallest unit for time

A

Nano sec 10 ^ -9
Shake =10^-8

39
Q

Largest unit measure for time

A

Cosmic year
Sun revolves around milk way
Sun speed 300 km / sec
The time taken Sun to revolve around the milky Way galaxy is called cosmic year
1 cosmic 250 million years
25 crores years

40
Q

Measuring the time used mostly accurately

A

Atomic clockes
Made up of ceasium (55)

41
Q

The purity of milk measured with

A

Lactometer

42
Q

The working principles of lacho meter and submarine

A

Laws of floatation

43
Q

Tachometer

A

Rpm
Odometer is distance( the distance covered by the vehicle
Speedometer in bikes ( to know the speed of the vehicle
Purity of gold 1 carrot
1 carrot - 200 milligrams

44
Q

The density of gases maximum at which

A

Density prop to mass inversely to volume
At low temperature and high pressure

45
Q
A

Substance density
Water 1 g/ cc
Ice 0.9 g/ cc
Kerosene 0.8 g /cc
Wood 0.7 g /cc
Alcohol 0.79 g / cc
Hg Mercury 13.6 g /cc
Iron 7.8 g/ cc
Copper 8.9
Gold 19.3
Platinum 24
Air 1.29 *10 ^-3 0.0012
H 8.9 * 10 -^5

46
Q

Who state laws of floatation

A

Archimedes
1 if the density of the object greater than the density of liquid then the object sink
2 if the density of the object less than the density of the liquid then the object floats

47
Q

Deniity of water

A

1 gm/ cc
Ice cube 0.9 gm/ cc

48
Q

Density of alochol

A

0.78 gm cc

49
Q

Nail in mercury

A

Floats.
Because iron has 7.86
But mercury has 13.6

50
Q

Density of iron

51
Q

Gold

A

19.29
Silver 10.5
Diamond 3.51
Platinum 21.5

52
Q

Earth density

A

5.515 gm /cc
Saturn 0.625

53
Q

Compare sea and river water density

A

Sea water more dense than the river water
It is easier to swim in sea water
Dense of sea -

54
Q

Relative density or specific density

A

Relative has no units remember
Density of substance/ density of water at 4°

Refractive index
Mark number
Relative permeability
Magnetic susceptibility

55
Q

Relative density of liquids measured by

A

Hydrometer
Humidity hygrometer

56
Q

The density Water density max at4°

A

Because the volume of water min at 4°
Reason
When we heat water in the boil kinda heat istunte heat perigi 4 ° dagara bowl expand avvudii avvagane volume of water kindaki diguddii apude

57
Q

Ureka is a word first coined by

A

Archimedes,
Archimedes principle
Bowl teskunadu with water, 10 rs coin vesadu asalu kali ledu water padipokunda ah water ni collect chesi baruvu chusaru
Coin weight Is equal to the water displaced weight

Physics (9 decks)

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