The dimension of , is permittivity of free space and E is electric field is
[ML2T-2]
[ML-1T-3]
[ML2T-1]
[ML2T-1]
B.
[ML-1T-3]
The density of material in CGS system of units is 4g/ cm2.In a system of units in which unit of lengths is 10 cm and unit of mass is 100 g, the value of density of material will be
0.4
40
400
400
B.
40
M = dV
d= M/L3
d = 4 g/cm3
If the error in the measurement of radius of sphere is 2%, then the error in the determination of volume of the sphere will be
4%
6%
8%
8%
B.
6%
Which two of the following five physical parameters have the same dimensions?
1) Energy density
2) refractive index
3) dielectric constant
4) Young's modulus
5) Magnetic field
2 and 4
3 and 5
1 and 4
1 and 4
C.
1 and 4
If the dimensions of a physical quantity are given by Ma Lb Tc, the physical quantity will be
pressure if a = 1, b = -1, c= 2
velocity if a = 1, b = 1, c = -2
acceleration if a = 1, b = 1, c =-2
acceleration if a = 1, b = 1, c =-2
A.
pressure if a = 1, b = -1, c= 2
Dimensions of velocity = [ M0L1T-1]
Here, a = 0, b =1, c = -1
Dimension of acceleration = [ M0L1T-2]
Dimension of force = [ M1L1T-2]
Dimension of pressure = [M1L-1T-2
The physical quantity is pressure.