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physics > measurement > Flashcards

measurement Flashcards

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1
Q

what do we study in physics

A

physical and universal world and their generals as in energy and matter etc

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2
Q

what is SI

A

scientific method of expressing quantities and magnitudes

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3
Q

name supplementary units

A

radian and stredian

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4
Q

what is number of radians

A

arc length/ radius of same circle or S/r

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5
Q

how many radians and degrees are in one revolution

A

2 pie radians and 360 degrees

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6
Q

1 rad= ?

A

57.3 degrees

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7
Q

1 degree= ?

A

0.01745 radians

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8
Q

how many radians does one circle have

A

6.28 radians

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9
Q

differentiate between radian and steradian

A

radian is 2d plane angle and steradian is 3d solid angle

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10
Q

what is number of steradians

A

area of sphere/r^2 or 4 pie r^2/ r^2

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11
Q

what is the surface area of closed sphere of radius

A

4 pie r^2

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12
Q

define radian

A

plane angle subtended at the circle by an arc equal to radius of the circle

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13
Q

define steradian

A

solid angle subtended at the centre of sphere by an area of its surface equal to the square of radius of the sphere

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14
Q

what is scientific notation

A

writing large number quantities in decimal form

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15
Q

what is prefix

A

a mechanism by which a scientific notation term is given a proper name by its power in 10

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16
Q

what is an error

A

any doubt hat exists for result of any measurement

17
Q

types of errors

A

systematic errors and random errors

18
Q

how can they be minimized

A

improving instrumental techniques, better instruments and removing personal bias

19
Q

what is uncertainty

A

quantification or magnitude of error

20
Q

types of uncertainty

A

absolute
fractional
percentage

21
Q

what are significant figures

A

accurately known digits and the first doubtful digit

22
Q

what is precision

A

degree of exactness which a measurement is stated and made

23
Q

what is accuracy

A

closeness of a measured value to the actual value of measured quantity

24
Q

what are physical dimensions

A

physical nature of quantity

25
Q

what is dimension variable

A

physical quantities which have dimensions and are of variable magnitude
force, energy etc

26
Q

what is dimension constant

A

physical quantities which have dimensions but are constant in magnitude
speed of light, plank’s constant etc

27
Q

what is dimensionless variable

A

physical quantities which have no dimensions but changing magnitude
plane/solid angle etc

28
Q

what is dimensionless constant

A

physical quantities which have no dimensions but having constant magnitude
pure numbers etc

physics (1 decks)

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