1. What is the dimensional formula of electric current?
A.
[M^0 L^0 T^0 I^1]
B.
[M^1 L^1 T^-1 I^0]
C.
[M^0 L^0 T^1 I^1]
D.
[M^1 L^0 T^-2 I^1]
Correct Answer:
[M^0 L^0 T^0 I^1]
Explanation:
Electric current is a fundamental physical quantity, so its dimensional formula is represented by I or [M^0 L^0 T^0 I^1].
2. Which symbol represents the dimension of electric current?
A.
M
B.
L
C.
I
D.
T
Correct Answer:
I
Explanation:
In the dimensional system, I is used to represent the dimension of electric current.
3. Electric current is classified as which type of physical quantity in dimensional analysis?
A.
Derived quantity
B.
Dimensionless quantity
C.
Fundamental quantity
D.
Scalar derived quantity only
Correct Answer:
Fundamental quantity
Explanation:
Electric current is one of the seven SI fundamental physical quantities, and its fundamental dimension is denoted by I.
4. What is the dimensional formula of the SI unit ampere?
A.
[M^0 L^0 T^0 I^1]
B.
[M^1 L^0 T^-1 I^0]
C.
[M^0 L^1 T^-1 I^1]
D.
[M^1 L^2 T^-2 I^-1]
Correct Answer:
[M^0 L^0 T^0 I^1]
Explanation:
The ampere is the SI base unit of electric current, so its dimensional formula is [M^0 L^0 T^0 I^1].
5. If electric current is denoted by I, which statement about its dimensions is correct?
A.
It has dimensions of time
B.
It has dimensions of length
C.
It has dimensions of electric current, I
D.
It has no dimensions
Correct Answer:
It has dimensions of electric current, I
Explanation:
The symbol I directly denotes the fundamental dimension of electric current.
6. Which of the following correctly expresses the dimensions of electric current using fundamental dimensions?
A.
M^1L^1T^-2
B.
M^0L^0T^0I^1
C.
M^1L^0T^-1
D.
M^0L^1T^0
Correct Answer:
M^0L^0T^0I^1
Explanation:
Since electric current is a fundamental quantity, its powers of mass, length, and time are zero, while the power of current is one.
7. What is the dimensional symbol for electric current in the M-L-T-I system?
A.
M
B.
L
C.
T
D.
I
Correct Answer:
I
Explanation:
The M-L-T-I system uses I as the fundamental dimension for electric current.
8. The dimensions of electric current are independent of which set of dimensions?
A.
Mass, length, and time
B.
Current only
C.
Mass and current
D.
Length and current
Correct Answer:
Mass, length, and time
Explanation:
Electric current is a fundamental quantity, so it is not expressed in terms of mass, length, or time.
9. Which dimensional formula corresponds to a quantity whose only fundamental dimension is electric current?
A.
[M^1 L^0 T^0 I^0]
B.
[M^0 L^1 T^0 I^0]
C.
[M^0 L^0 T^0 I^1]
D.
[M^0 L^0 T^1 I^0]
Correct Answer:
[M^0 L^0 T^0 I^1]
Explanation:
A quantity having only the dimension of electric current has zero powers of M, L, and T, and a first power of I.
10. In dimensional notation, what is the power of the electric-current dimension in the dimensional formula of electric current itself?
A.
0
B.
1
C.
2
D.
-1
Correct Answer:
1
Explanation:
The dimensional formula of electric current contains I to the first power, so the power of the current dimension is 1.
Short questions are currently unavailable for this page.