Ch:1 - Units and Measurement Flashcards by Alen John

1 foot = _____ cm

30.48 cm

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1 foot = _____ inch

12 inch

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1 pound = _____ kg

0.4536 kg

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1 inch = _____ cm

2.54 cm

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FPS system stands for:

foot, pound, second

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CGS system stands for:

centimetre, gram, second

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MKS system stands for:

metre, kilogram, second

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FPS system was introduced by:

British

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‘SI’ stands for:

Systeme Internationale d’unites (International System of Units)

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Where and who developed the SI system?

1971, by the General Conference on Weights and Measures

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What is the unit and symbol of length?

metre (m)

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What is the unit and symbol of mass?

kilogram (kg)

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What is the unit and symbol of time?

second (s)

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What is the unit and symbol of electric current?

ampere (A)

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What is the unit and symbol of thermodynamic temperature?

kelvin (K)

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What is the unit and symbol of amount of substance?

mole (mol)

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What is the unit and symbol of luminous intensity?

candela (cd)

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Which are the 2 supplementary quantities?

Plane angle & Solid angle

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What is the unit and symbol of plane angle?

radian (rad)

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What is the unit and symbol of solid angle?

steradian (sr)

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1° = _____ rad

π/180 rad

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1 rad = _____ °

(180/π)°

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What is the formula of Plane angle (θ)?

dθ = dl/r

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What is the formula of Solid angle (Ω)?

dΩ = dA/r²

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What is the speed of light in a vacuum?

3 x 10⁸ m/s

What is the Parallax formula?

D = b/θ

1° = ______ '

60'

1' = _____ ''

60''

1 AU = __________ m

1.496 x 10¹¹ m

1 ly = __________ m

9.46 x 10¹⁵ m

1 parsec = ___________ m

3.08 x 10¹⁶ m

1 parsec = _____ ly

3.26 ly

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

10⁶

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

10⁹

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

10¹²

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

10⁻⁶

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

10⁻⁹

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

10⁻¹²

1 fermi = _____ m

10⁻¹⁵ m

1 angstrom (Å)= _____ m

10⁻¹⁰ m

1 L = _____ cm³ = _____ m³

1000 cm³, 10⁻⁶ m³

What is the cgs unit of Force?

dyne (dyn)

1 N = _____ dyne

10⁵ dyne

What is the cgs unit of Energy?

erg (erg)

1 J = _____ erg

10⁷ erg

1 hp = _____ W

746 W

1 kWh = __________ J

3.6 x 10⁶ J

1 eV = __________ J

1.6 x 10⁻¹⁹ J

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

barn

1 barn = _____ m²

10⁻²⁸ m²

What is the smallest practical unit of time?

shake

1 shake = ______ s

10⁻⁸ s

1 u = __________ kg

1.66 x 10⁻²⁷ kg

1 quintal = ____ kg

100 kg

1 tonne = _____ kg

1000 kg

1 CSL = __________

1.4 x solar mass

What is the l.c of a metre scale?

1 mm/ 0.1 cm

What is the l.c of a vernier calliper?

0.1 mm/ 0.01 cm

What is the l.c of a screw gauge?

0.01 mm/ 0.001 cm

The error in 'aₙ' is:

Δaₙ = aₙ - aₘ

The absolute error in 'aₙ' is:

|Δaₙ| = |aₙ - aₘ|

What is the formula of relative error of 'a'?

Relative error = Δaₘ/aₘ

What is the formula of percentage error of 'a'?

Percentage error = (Δaₘ/aₘ) x 100

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

ΔZ = ΔA + ΔB

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

ΔZ = ΔA - ΔB

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

(ΔZ/Z) = (ΔA/A) + (ΔB/B)

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

(ΔZ/Z) = (ΔA/A) + (ΔB/B)

How can we write exponents of errors in Z = Aⁿ

((ΔZ/Z) = n(ΔA/A)

What is the dimension of Velocity?

[LT⁻¹]

What is the dimension of Acceleration?

[LT⁻²]

What is the dimension of Work?

[ML²T⁻²]

What is the dimension of Energy?

[ML²T⁻²]

What is the dimension of Power?

[ML²T⁻³]

What is the dimension of Force?

[MLT⁻²]

What is the dimension of Pressure?

[ML⁻¹T⁻²]

1 VSD = _____ MSD

9/10

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

l.c = 1 MSD - 1 VSD

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

Z.E = VSC x l.c

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

T.R = O.R - Z.E

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

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

1° = ___________ rad

1.745 x 10⁻² rad

1' = ___________ rad

2.91 x 10⁻⁴ rad

1'' = ___________ rad

4.85 x 10⁻⁶ rad

Ch:1 - Units and Measurement Flashcards

(83 cards)