Measurement

Unit :  The chosen standard used for measuring a physical quantity is called unit.

Unit are of two types  ( I) Fundamental unit     (II)  Derived Unit

System of units - unit depend on choice. Each choice  of units leads to a new system ( Set) of units.The internationally accepte3d systems are (i) CGS sytstem, (ii) MKS System (iii) FPS System (iv) SI Units.

SI units, There are seven basic units




Bilogy

1. Potential is measured in

A. Joule
B. Joule/Coulomb
C. Watt
D. Newton - second

 


2. Maxwell is the unit of

A. Magnetic susceptibility
B. Ermeability
C. Magnetic flux
D. Intensity of magnetizatiuon

 


3. Which is not matched?

A. Horse power - unit of power
B. Nautical mile - unit of distant
C. Celsius - unit of heat
D. Decibel - unit of sound

 


4. One astronomical unit is the average distant between

A. Earth and the sun
B. Jupiter and Sun
C. Earth and the moon
D. Pluto and sun

 


5. Parsec is the unit of

A. Distant
B. Time
C. Magnetic Line
D. Intensity light

 


6. Which of the following victor quantity

A. Energy
B. Pressure
C. Work
D. Momentum

 


7. A noise level of 100 decibel would correspond to

A. Sound from a noisy street
B. Noise from a machine shop
C. Ordianary conversation
D. Just audible sound

 


8. The most suitable unit for expressing nuclear radius is

A. Micron
B. Fermi
C. Nanometer
D. Angstrom

 


9. Number of basic SI unit is

A. 7
B. 5
C. 6
D. 3

 


10. Amper is the unit of

A. Magnetic field
B. Current electricity
C. Resistance
D. Electrics charge

 


11. Light year is a unit of

A. Distant
B. Mass
C. Speed of light
D. Time

 


12. "Bar" is the unit of

A. Current
B. Temperature
C. Heat
D. Atmospheric pressure

 


13. Which of the following is not the unit of energy?

A. Calorie
B. Joule
C. Watt
D. Electron volt

 


14. Si unit of luminious intensity is

A. Lux
B. Watt
C. Lumen
D. Candela

 


15. What is the SI unit of pressure?

A. Jule
B. Newton
C. Pyne
D. Pascal

 


16. Knot is a unit of speed of which of the following?

A. Sound waves
B. Ship
C. Light waves
D. Aeroplane

 


17. Curie is the unit of

A. Temperature
B. Heat
C. Energy
D. Radio activity

 


18. One horse - Power is equal to

A. 786 watts
B. 756 watts
C. 436 watts
D. 746 watts

 


19. One fathom is equal to

A. 6 feets
B. 60 feets
C. 6 meter
D. 100 cm


20. The unit for measurement of magnetic induction is

A. Grass
B. Weber
C. Joule
D. Gauss

21. Fathom is the unit of

A. Frequency
B. Distant
C. Depth
D. Sound

22. Electric current SI measure by

A. Voltmeter
B. Ammeter
C. Anemometer
D. Commentator

23. The temperature of a gas is measured with a

A. Vapour pressure thermometer
B. Platinum resistance thermometer
C. Pyrometer
D. Gas thermometer

24. Device used to measure very high temperature is

A. thermometer
B. Calorimeter
C. Pyrometer
D. Bolometer

25. What is the unit for measuring the pitch of frequency of sound?

A. Colombo
B. Decal
C. hertz
D. Cycles
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