Mechanics CDS Questions

CDS Physics

Mechanics MCQ Questions


1.
In the SI system, the fundamental (base) unit of mass is the:
A.
Newton
B.
Kilogram
C.
Gram
D.
Pound
😑 View Answer Rough Work Error
ANSWER :
B. Kilogram
2.
Which of the following is a derived physical quantity, rather than a fundamental (base) quantity, in the SI system?
A.
Time
B.
Length
C.
Force
D.
Mass
😑 View Answer Rough Work Error
ANSWER :
C. Force
3.
The dimensional formula for force is correctly given as:
A.
[M⁰L¹T⁻²]
B.
[M¹L¹T⁻²]
C.
[M¹L²T⁻²]
D.
[M¹L¹T⁻¹]
😑 View Answer Rough Work Error
ANSWER :
B. [M¹L¹T⁻²]
4.
Which of the following physical quantities is a vector quantity (possessing both magnitude and direction)?
A.
Mass
B.
Displacement
C.
Speed
D.
Distance
😑 View Answer Rough Work Error
ANSWER :
B. Displacement
5.
Which of the following best describes the key difference between distance and displacement?
A.
Distance is a vector quantity while displacement is a scalar quantity
B.
Distance and displacement are always numerically equal in every situation
C.
Distance is the total path length travelled (scalar); displacement is the shortest straight-line distance between initial and final positions (vector)
D.
Displacement is always greater than distance
😑 View Answer Rough Work Error
ANSWER :
C. Distance is the total path length travelled (scalar); displacement is the shortest straight-line distance between initial and final positions (vector)
6.
The principle of homogeneity of dimensions states that:
A.
Dimensional formulas can never be used to verify equations
B.
Only scalar quantities possess dimensions
C.
Only quantities having the same dimensions can be added, subtracted, or equated
D.
All physical quantities must have identical units
😑 View Answer Rough Work Error
ANSWER :
C. Only quantities having the same dimensions can be added, subtracted, or equated