### Multiple Choice Questions and Answers (MCQs) on SI Units

01. Pick up the correct statement from the following:

(A) In S.I. system, pressure is expressed in N/m2
(B) In S.I. system, force is expressed in Newtons
(C) In S.I. system, power is expressed in watts
(D) All the above

02. Angular acceleration is expressed as

(A) m/s2
(B) w/s2

03. m2/s is used in S.I. system for

(A) Surface tension
(B) Kinematic viscosity
(C) Pressure
(D) Power

04. In SI system, the unit of temperature, is

(B) Degree Celsius
(C) Kelvin
(D) Degree Fahrenheit

05. The unit kg/m3 is used for

(A) Force
(B) Density
(C) Volume
(D) Pressure

06. The intensity of pressure at a certain place is 1 kg (f)/m2, the intensity of pressure e in SI units will be

(A) 47.88 N/m2
(B) 9.81 N/m2
(C) 4.882 N/m2
(D) 0.07013 N/m2

07. The fundamental units in S.I. system, are the same as that of

(A) C.G.S. units
(B) F.P.S. units
(C) M.K.S. units
(D) None of these

08. SI unit for the surface tension, is

(A) kg/m3
(B) kg/m2
(C) kg/m
(D) N/m

09. 1 kg wt in gravitational unit equals

(A) 8.9 N in SI system
(B) 9.8 N in SI system
(C) 4.5 N in SI system
(D) 5.4 N in SI system

10. One Newton force equals

(A) 105 dynes
(B) 104 dynes
(C) 103 dynes
(D) 102 dynes

11. 10-12, is called

(A) Terra
(B) Pica
(C) Giga
(D) Mega

12. One Newton force produces an acceleration of

(A) 1 cm/sec2 while acting on a body of 1 gm mass
(B) 1 cm/sec2 while acting on a body of 1 kg mass
(C) 1 m/sec2 while acting on a body of 1 kg mass
(D) 1 m/sec2 while acting on a body of 1 gm mass

13. The bar used for defining the standard metre at the International office of weights and measures at Sevres near Paris, is composed of

(A) 50% platinum and 50% iridium
(B) 60% platinum and 40% iridium
(C) 80% platinum and 20% iridium
(D) 90% platinum and 10% iridium

14. In S.I. system, symbol for the specific weight is

(A) kg/m3
(B) N/m3
(C) N/m2
(D) None of these

15. Basic unit of thermodynamic temperature, is

(A) Degree Fahrenheit
(C) Degree Kelvin
(D) Degree absolute

16. Hertz (Hz) is used to express

(A) Luminous intensity
(B) Electric current intensity
(C) Power
(D) Frequency

17. Pick up the correct statement from the following:

(A) The units of moment of inertia of a plane area, depends upon the units of the area and the length
(B) The moment of inertia is expressed in cm4 if the area is in square centimetres and the length in centimetres
(C) The moment of inertia is expressed in mm4 if the area is in square millimetres and the length in millimetres
(D) All the above

18. In S.I. system, the symbol for density is

(A) N/m3
(B) kg/m3
(C) m3/s
(D) kg

19. To convert the units of M.K.S. to units of S.I., a factor 9.80665 is used for

(A) Mass
(B) Force
(C) Work energy
(D) All the above

20. The thickness of a micron, is

(A) 10-3 m
(B) 10-6 m
(C) 10-9 m
(D) 10-12 m

21. In SI units, moment is expressed as

(A) kg-m
(B) kg-cm
(C) kg-mm
(D) All the above

22. Joule or Newton metric is used for

(A) Work
(B) Torque
(C) Energy
(D) All the above

23. N-s/m2 is used in S.I. system for

(A) Kinematic viscosity
(B) Dynamic viscosity
(C) Mass density
(D) Weight density

24. The S.I. unit of Modulus of elasticity is

(A) Newton/m2
(B) Newton/cm2
(C) Newton/mm2
(D) All the above

25. Pick up the correct statement from the following:

(A) 1 N force = 0.10197 kgf
(B) 1 kgf = 9.80665 N
(C) 1 kgf/cm2 = 98.0665 kN/m2
(D) All the above

26. The basic quantity in the International system of units, is

(A) Length and mass
(B) Time and temperature
(C) Mole and light intensity
(D) All the above

27. One Newton is equivalent to

(A) 0.10197 kgf
(B) 0.20197 kgf
(C) 9.80665 kgf
(D) 0.97125 kgf

28. Candela (Cd) is used to express

(A) Luminous intensity
(B) Electric current intensity
(C) Power
(D) Frequency

29. The SI unit of the force is

(A) Newton
(B) Kilograms
(C) Joule
(D) Erg

30. If α is the angular acceleration of a body of moment of inertia I, the torque is

(A) I2 α
(B) I α
(C) I/α
(D) I2/α

31. Intensity of electric current is expressed in

(A) Volts
(B) Watts
(C) Amperes
(D) Joules

32. The fundamental units in S.I. System are:

(A) Centimetre, gram, second
(B) Foot, pound, second
(C) Metre, kilogram, second
(D) Kilometre, kilogram, minute

33. 100 kN/m2 pressure is equal to

(A) 1 atm
(B) 1 bar
(C) 1 m bar
(D) 1 mm Hg

34. The solid angles are measured in

(A) Degrees