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

Answer: Option D

02. Angular acceleration is expressed as

(A) m/s2
(B) w/s2
(C) rad/s2
(D) rad/s

Answer: Option C

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

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

Answer: Option B

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

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

Answer: Option C

05. The unit kg/m3 is used for

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

Answer: Option B

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

Answer: Option B

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

Answer: Option C

08. SI unit for the surface tension, is

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

Answer: Option D

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

Answer: Option B

10. One Newton force equals

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

Answer: Option A

11. 10-12, is called

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

Answer: Option B

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

Answer: Option C

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

Answer: Option D

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

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

Answer: Option B

15. Basic unit of thermodynamic temperature, is

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

Answer: Option C

16. Hertz (Hz) is used to express

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

Answer: Option D

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

Answer: Option D

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

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

Answer: Option B

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

Answer: Option D

20. The thickness of a micron, is

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

Answer: Option B

21. In SI units, moment is expressed as

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

Answer: Option D

22. Joule or Newton metric is used for

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

Answer: Option D

23. N-s/m2 is used in S.I. system for

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

Answer: Option B

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

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

Answer: Option D

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

Answer: Option D

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

Answer: Option D

27. One Newton is equivalent to

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

Answer: Option A

28. Candela (Cd) is used to express

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

Answer: Option A

29. The SI unit of the force is

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

Answer: Option A

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

Answer: Option B

31. Intensity of electric current is expressed in

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

Answer: Option C

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

Answer: Option C

33. 100 kN/m2 pressure is equal to

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

Answer: Option B

34. The solid angles are measured in

(A) Degrees
(B) Grades
(C) Radians
(D) Steradian

Answer: Option D

35. Stress in SI units is expressed in

(A) kg per sq cm
(B) kg per sq mm
(C) Newton per sq mm
(D) Newton per sq m

Answer: Option D