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Jouer Test
1. 
What is the SI unit of length?
A.
Kilometer
B.
Meter
C.
Centimeter
D.
Millimeter
2. 
What is the speed of light in a vacuum?
A.
3,000,000 meters per second
B.
299,792,458 meters per second
C.
300,000,000 meters per second
D.
29,792,458 meters per second
3. 
The definition of the meter ties it to which two fundamental constants?
A.
The speed of light and the Planck constant
B.
The speed of sound and the gravitational constant
C.
The speed of light and the caesium frequency
D.
The speed of light and the Earth's circumference
4. 
How is the kilogram defined?
A.
As the mass of a specific metal cylinder
B.
As the mass of a specific metal sphere
C.
By the fixed numerical value of the speed of light
D.
By the fixed numerical value of the Planck constant
5. 
What is the numerical value of the Planck constant in the definition of the kilogram?
A.
6.62607015×10^23 J
B.
6.62607015×10^34 J
C.
6.62607010×10^34 J
D.
6.62607015×10^20 J
6. 
What is the SI unit of time?
A.
Minute
B.
Second
C.
Hour
D.
Day
7. 
What is the numerical value of the caesium frequency in the definition of the second?
A.
9192631683 Hz
B.
9192631772 Hz
C.
9192631770 Hz
D.
9192631690 Hz
8. 
The definition of the second is based on the unperturbed ground-state hyperfine transition frequency of which atom?
A.
Carbon-12
B.
Hydrogen
C.
Nitrogen-14
D.
Caesium-133
9. 
What is the SI unit of electric current?
A.
Volt
B.
Ampere
C.
Ohm
D.
Watt
10. 
The definition of the ampere is based on the fixed numerical value of which physical constant?
A.
The elementary charge
B.
The gravitational constant
C.
The Planck constant
D.
The speed of light
11. 
What is the SI unit of thermodynamic temperature?
A.
Celsius
B.
Fahrenheit
C.
Kelvin
D.
Rankine
12. 
What is the numerical value of the Boltzmann constant in the definition of the kelvin?
A.
1.380649×10^-23 J K^-1
B.
6.62607015×10^-34 J s
C.
299792458 m/s
D.
6.02214076×10^23 mol^-1
13. 
The definition of the kelvin is based on the fixed numerical value of which physical constant?
A.
The speed of light
B.
The Planck constant
C.
The Boltzmann constant
D.
The Avogadro constant
14. 
What is the SI unit of amount of substance?
A.
Mole
B.
Gram
C.
Kilogram
D.
Liter
15. 
How many elementary entities are contained in one mole?
A.
6.02214076×10^22
B.
6.02214076×10^24
C.
6.02214076×10^23
D.
6.02214076×10^25
16. 
The Avogadro constant is also known as the
A.
Molar constant
B.
Mole constant
C.
Avogadro number
D.
Molar number
17. 
What is the SI unit of luminous intensity?
A.
Lux
B.
Lumen
C.
Watt
D.
Candela
18. 
What is the fixed numerical value of the luminous efficacy of monochromatic radiation used in defining the candela?
A.
540×10^12 Hz
B.
683 lm W^-1
C.
1 cd sr W^-1
D.
1 cd sr kg^-1 m^-2 s^3
19. 
The definition of the candela is based on the fixed numerical value of which physical constant?
A.
The speed of light
B.
The Planck constant
C.
The Avogadro constant
D.
The luminous efficacy of monochromatic radiation
20. 
The luminous efficacy of monochromatic radiation used in defining the candela corresponds to a wavelength of approximately
A.
540 nm
B.
650 nm
C.
750 nm
D.
450 nm