### 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**