CBSE
If σ = surface change density, ε = electric permittivity, the dimensions of is same as
electric force
electric field intensity
pressure
electric charge
A physical quantity A is related to four observables a, b, c and d as follows :
. The percentage errors of measurement in a, b, c and d are 1%, 3%, 2% and 2% respectively. What is the percentage error in the quantity A ?
12 %
7 %
5 %
14 %
The dimensions of kinetic energy is
[M2L2T]
[ML2T]
[ML2T-2]
[ML2T-1]
The physical quantity having dimensions [M-1L-3T3A2] is
resistance
resistivity
electrical conductivity
electromotive force
The potential energy of a particle varies with distance x from a fixed origin as ; where A and B are constants. The dimensions of AB are
If the figure below represents a parabola, identify the physical quantities representing Y and X for constant acceleration
X = time, Y = velocity
X = velocity, Y = time
X = time, Y= displacement
X = time, Y = acceleration
The dimensional formula of magnetic flux is
[MLT-2A-1]
[ML2T-1A-1]
[ML2T-1A-2]
[ML2T-2A-1]
The dimensions of σb4 are (where, σ = Stefan's constant and b = Wein's constant).
[ M0L0T0 ]
[ ML4T-3 ]
[ ML-2T ]
[ ML6T-3 ]
The SI unit of gravitational potential is
J
J-kg-1
J-kg
J-kg2
A gas bubble forms an explosion under water which oscillate with a period T ∝ paρbEc, where p is the static pressure, ρ is the density ofwater and E is the total energy of explosion. Then, the values of a, b and c will be