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(B) PHYSICS > Ch:1 - Units and Measurement > Flashcards

Ch:1 - Units and Measurement Flashcards

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1
Q

1 foot = _____ cm

A

30.48 cm

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2
Q

1 foot = _____ inch

A

12 inch

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3
Q

1 pound = _____ kg

A

0.4536 kg

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4
Q

1 inch = _____ cm

A

2.54 cm

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5
Q

FPS system stands for:

A

foot, pound, second

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6
Q

CGS system stands for:

A

centimetre, gram, second

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7
Q

MKS system stands for:

A

metre, kilogram, second

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8
Q

FPS system was introduced by:

A

British

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9
Q

‘SI’ stands for:

A

Systeme Internationale d’unites (International System of Units)

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10
Q

Where and who developed the SI system?

A

1971, by the General Conference on Weights and Measures

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11
Q

What is the unit and symbol of length?

A

metre (m)

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12
Q

What is the unit and symbol of mass?

A

kilogram (kg)

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13
Q

What is the unit and symbol of time?

A

second (s)

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14
Q

What is the unit and symbol of electric current?

A

ampere (A)

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15
Q

What is the unit and symbol of thermodynamic temperature?

A

kelvin (K)

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16
Q

What is the unit and symbol of amount of substance?

A

mole (mol)

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17
Q

What is the unit and symbol of luminous intensity?

A

candela (cd)

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18
Q

Which are the 2 supplementary quantities?

A

Plane angle & Solid angle

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19
Q

What is the unit and symbol of plane angle?

A

radian (rad)

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20
Q

What is the unit and symbol of solid angle?

A

steradian (sr)

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21
Q

1° = _____ rad

A

π/180 rad

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22
Q

1 rad = _____ °

A

(180/π)°

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23
Q

What is the formula of Plane angle (θ)?

A

dθ = dl/r

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24
Q

What is the formula of Solid angle (Ω)?

A

dΩ = dA/r²

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25
Q

What is the speed of light in a vacuum?

A

3 x 10⁸ m/s

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26
Q

What is the Parallax formula?

A

D = b/θ

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27
Q

1° = ______ ‘

A

60’

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28
Q

1’ = _____ ‘’

A

60’’

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29
Q

1 AU = __________ m

A

1.496 x 10¹¹ m

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30
Q

1 ly = __________ m

A

9.46 x 10¹⁵ m

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31
Q

1 parsec = ___________ m

A

3.08 x 10¹⁶ m

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32
Q

1 parsec = _____ ly

A

3.26 ly

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33
Q

What is the value of the prefix mega (M) in the power of 10?

A

10⁶

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34
Q

What is the value of the prefix giga (G) in the power of 10?

A

10⁹

35
Q

What is the value of the prefix tera (T) in the power of 10?

A

10¹²

36
Q

What is the value of the prefix micro (μ) in the power of 10?

A

10⁻⁶

37
Q

What is the value of the prefix nano (n) in the power of 10?

A

10⁻⁹

38
Q

What is the value of the prefix pico (p) in the power of 10?

A

10⁻¹²

39
Q

1 fermi = _____ m

A

10⁻¹⁵ m

40
Q

1 angstrom (Å)= _____ m

A

10⁻¹⁰ m

41
Q

1 L = _____ cm³ = _____ m³

A

1000 cm³, 10⁻⁶ m³

42
Q

What is the cgs unit of Force?

A

dyne (dyn)

43
Q

1 N = _____ dyne

A

10⁵ dyne

44
Q

What is the cgs unit of Energy?

A

erg (erg)

45
Q

1 J = _____ erg

A

10⁷ erg

46
Q

1 hp = _____ W

A

746 W

47
Q

1 kWh = __________ J

A

3.6 x 10⁶ J

48
Q

1 eV = __________ J

A

1.6 x 10⁻¹⁹ J

49
Q

What is the unit of the area of a nuclear cross-section?

A

barn

50
Q

1 barn = _____ m²

A

10⁻²⁸ m²

51
Q

What is the smallest practical unit of time?

A

shake

52
Q

1 shake = ______ s

A

10⁻⁸ s

53
Q

1 u = __________ kg

A

1.66 x 10⁻²⁷ kg

54
Q

1 quintal = ____ kg

A

100 kg

55
Q

1 tonne = _____ kg

A

1000 kg

56
Q

1 CSL = __________

A

1.4 x solar mass

57
Q

What is the l.c of a metre scale?

A

1 mm/ 0.1 cm

58
Q

What is the l.c of a vernier calliper?

A

0.1 mm/ 0.01 cm

59
Q

What is the l.c of a screw gauge?

A

0.01 mm/ 0.001 cm

60
Q

The error in ‘aₙ’ is:

A

Δaₙ = aₙ - aₘ

61
Q

The absolute error in ‘aₙ’ is:

A

|Δaₙ| = |aₙ - aₘ|

62
Q

What is the formula of relative error of ‘a’?

A

Relative error = Δaₘ/aₘ

63
Q

What is the formula of percentage error of ‘a’?

A

Percentage error = (Δaₘ/aₘ) x 100

64
Q

How can we write the addition of errors in Z = A + B?

A

ΔZ = ΔA + ΔB

65
Q

How can we write the subtraction of errors in Z = A - B?

A

ΔZ = ΔA - ΔB

66
Q

How can we write the multiplication of errors in Z = AB?

A

(ΔZ/Z) = (ΔA/A) + (ΔB/B)

67
Q

How can we write the division of errors in Z = A/B?

A

(ΔZ/Z) = (ΔA/A) + (ΔB/B)

68
Q

How can we write exponents of errors in Z = Aⁿ

A

((ΔZ/Z) = n(ΔA/A)

69
Q

What is the dimension of Velocity?

A

[LT⁻¹]

70
Q

What is the dimension of Acceleration?

A

[LT⁻²]

71
Q

What is the dimension of Work?

A

[ML²T⁻²]

72
Q

What is the dimension of Energy?

A

[ML²T⁻²]

73
Q

What is the dimension of Power?

A

[ML²T⁻³]

74
Q

What is the dimension of Force?

A

[MLT⁻²]

75
Q

What is the dimension of Pressure?

A

[ML⁻¹T⁻²]

76
Q

1 VSD = _____ MSD

A

9/10

77
Q

What is the formula for finding the l.c in a vernier calliper?

A

l.c = 1 MSD - 1 VSD

78
Q

What is the formula for finding the Z.E in a vernier calliper?

A

Z.E = VSC x l.c

79
Q

What is the formula for finding the true value in a vernier calliper/screw gauge?

A

T.R = O.R - Z.E

80
Q

What is the formula for finding the l.c in a screw gauge?

A

l.c = Pitch/ No. of divisions on the circular scale

81
Q

1° = ___________ rad

A

1.745 x 10⁻² rad

82
Q

1’ = ___________ rad

A

2.91 x 10⁻⁴ rad

83
Q

1’’ = ___________ rad

A

4.85 x 10⁻⁶ rad

(B) PHYSICS (1 decks)

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