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CBSE Questions for Class 11 Engineering Physics Units And Measurement Quiz 13 - MCQExams.com

The dimension of 12ϵoE2 permittivity of free space and E:
Intensity of electric field) is



      

  • [MLT1]
  • [ML2T1]
  • [ML1T2]
  • [ML2T2]
The radius of a sphere is measured as (10±0.02 %) cm. The error in the measurement of its volume is 
  • 25.1 cc
  • 25.12 cc
  • 2.51 cc
  • 251.2 cc
A particle is moving with a velocity 35 m/s along positive x-axis.It's acceleration is towards negative X-axis with the magnitude 4m/s2 then the distance covered by the particle in the 9th second:-
  • 1m
  • 98m
  • 54m
  • 153m
The vector sum of three forces having magnitudes |F1|=100N,  |F2|=80N &  |F3|=60N acting on a particle is zero. the angle between F1  & F2 is nearly:-
  • 530
  • 1430
  • 370
  • 1270
Two constant force F1andF2 acts on a body.these forces displaces the body from point P(1, -2, 3) to Q (2, 3, 7 ) in 2s starting from rest.force F1 is of magnitude 9 N and acting along vector (2ˆi2ˆj+ˆk) . the positions are in meter. find work done by F1.
  • 12J
  • +12J
  • 36J
  • 36J
A force is given by F=at+bt2, where t is time, the dimensions of a and b are respectively :
  • [MLT4] and [MLT1]
  • [MLT1] and [MLT0]
  • [MLT3] and [MLT4]
  • [MLT3] and [MLT0]
The radius of a sphere is measured to be (4.0 +2.0) cm the maximum percentage error in the measurement of the volume of the sphere is 
  • 10 %
  • 15 %
  • 20 %
  • 25 %
If the constant of gravitation (G), Planck's constant (h) and the velocity of light (c) be chosen as fundamental units. The dimension of the radius of gyration is
  • h^{-1/2} c^{1/2} G^{1/2}
  • h^{1/2} c^{-3/2} G^{1/2}
  • h^{1/2} c^{-3/2} G^{-1/2}
  • h^{-1/2} c^{-3/2} G^{1/2}
In the equation { S }_{ nth }=u+\dfrac { a }{ 2 } \left( 2n-1 \right) , the letters have their usual meanings. The dimensional formula of S_{nth} is
  • \left[ { ML }^{ 0 }T \right]
  • \left[ { ML }^{ -1 }T^{ -1 } \right]
  • \left[ { M^{ 0 }L }T^{ -1 } \right]
  • \left[ { M^{ 0 }L }T^{ 0 } \right]
A physical quantity x depends on quantities y and Z as follows  : x= Ay+B tan (Cz), where A, B and C are constants . Which of the following do not have same dimensions ?
  • x and B
  • C and z^{ -1 }
  • y and B/A
  • x and A
The term (1/2)pv^{ 2 } occurs in Bernoulli's  equation , with \beta being the density of fluid and V its speed . The dimensions of this term are 
  • \left[ { M }^{ -1 }{ L }^{ 5 }{ T }^{ 2 } \right]
  • \left[ { M }{ L }{ T }^{ 2 } \right]
  • \left[ { M }{ L }^{ -1 }{ T }^{ -2 } \right]
  • \left[ { M }^{ -1 }{ L }^{ 9 }{ T }^{ -2 } \right]
Two resistance are measured in ohm and is given as:-
{ R }_{ 1 }=3\Omega \neq 1%
{ R }_{ 2 }=6\Omega \neq 2%
When they are connectrd in parallel, the percentage error in equivalent resistance is
  • 3.33\%
  • 4.5\%
  • 0.67\%
  • 1.33\%
The pair of physical quantities, that have difference dimensions is 
  • Planck's constant and angular momentum
  • Energy density and pressure
  • Relative density and plane angle
  • Specific heat capacity and latent heat
The dimension of the ratio of magnetic flux and the resistance is equal to that of:
  • induced emf
  • charge
  • inductance
  • current
If pressure is (P), velocity (V), and time (T) are taken as the fundamental quantities, then the dimensional formula of force is
  • \left[ P ^ { 1 } V ^ { 1 } T ^ { 1 } \right]
  • \left[ P ^ { 1 } V ^ { 2 } T ^ { 1 } \right]
  • \left\lceil P ^ { 1 } V ^ { 1 } T ^ { 2 } \right\rceil
  • \left[ P ^ { 1 } V ^ { 2 } T ^ { 2 } \right]
In a system of units if force (F), acceleration (A) and time, (T) are taken as fundamental units then the dimensional formula of energy is -
  • FA^{2}T
  • FAT^{2}
  • F^{2}AT
  • FAT
If the radius of the earth were to shrink by 1% its mass remaining the same, the acceleration due to gravity on the earth's surface would
  • Decreased by 2%
  • Increased by 2%
  • Remain unchanged
  • Increased by 1%
Dimensional formula [{ M }^{ 1 }{ L }^{ 0 }{ T }^{ -2 }] is equal to dimensional formula of 
  • Surface tension
  • surface energy
  • Both A and B
  • None of these
Dimensional formula of momentum is :
  • MLT
  • M^{-1} L^{-1} T^{-1}
  • ML^{-1} T^{-1}
  • MLT^{-1}
Dimensions of rate of change of flux are equivalent to those of 
  • voltage
  • current
  • 1/charge
  • charge
If  S = \dfrac { d } { t } + \dfrac { e } { ( f - t ) ^ { 2 } } ,  where  S  is the displacement of the body in time  t .  Find the dimensions of  e  and  f
  • \mathrm { LT } , \mathrm { T }
  • \mathrm { LT } ^ { 2 } , \mathrm { T }
  • \mathrm { L } ^ { 2 } \mathrm { T } , \mathrm { T } ^ { - 3 }
  • LT, T ^ { 2 }
The dimensional formula for the acceleration, velocity and length are \alpha { \beta  }^{ -2 }, \alpha { \beta  }^{  -1 } and \alpha y. What is the dimensional formula for the coefficient of friction ? 
  • \alpha \beta y
  • { \alpha }^{  -1 }{ \beta }^{ 10 }{ y }^{ 0 }
  • { \alpha }^{ 0 }{ \beta }^{ -1 }{ y }^{ 0 }
  • { \alpha }^{  0 }{ \beta }^{ 0 }{ y }^{ 0 }
The dimensions of the ratio of angular momentum to linear momentum:
  • \left[ { M }^{ 1 }{ L }^{ -3 }{ T }^{ 0 } \right]
  • \left[ { M }^{ 0 }{ L }^{ 1 }{ T }^{ -2 } \right]
  • \left[ { M }^{ 0 }{ L }^{ 0 }{ T }^{ -1 } \right]
  • \left[ { M }^{ 0 }{ L }^{ 1 }{ T }^{ 0 } \right]
The dimensions of universal gas constant is
  • \left[ { M }^{ }{ L }^{ 2 }{ T }^{ -2 }{ \theta }^{ -1 } \right]
  • \left[ { M }^{ 2 }{ L }^{ }{ T }^{ -2 }{ \theta }^{ } \right]
  • \left[ { M }^{ }{ L }^{ 3}{ T }^{ -1 }{ \theta }^{ -1 } \right]
  • None of these
Velocity gradient has same dimensional formula as
  • Frequency
  • angular momentum
  • velocity
  • none of these
The dimension of electric permittivity is
  • M{L}^{3}{T}^{4}{A}^{-2}
  • M{L}^{-3}{T}^{4}{A}^{2}
  • {M}^{-1}{L}^{3}{T}^{4}{A}^{2}
  • {M}^{-1}{L}^{-3}{T}^{4}{A}^{2}
Find dimension formula of polarisation?
  • \left[ { L }^{ -2 }T^{ 1 }{ A }^{ 1 } \right]
  • \left[ { L }^{ 2 }T^{ 1 }{ A }^{ -1 } \right]
  • \left[ { L }^{ 2}T^{ 1 }{ A }^{ 1} \right]
  • \left[ { L }^{ -3}T^{ -1 }{ A }^{ 1} \right]
If \eta represents the coefficient of viscosity and T the surface tension, then the dimension of \cfrac{T}{\eta} is same as that of:
  • length
  • mass
  • time
  • speed
Dimensional formula of modulus of elasticity is
  • \left[ M ^ { 0 } L ^ { - 1 } T ^ { - 2 } \right]
  • \left[ M ^ { 1 } L ^ { - 1 } T ^ { - 2 } \right]
  • \left[ M ^ { 1 } L ^ { 1 } T ^ { - 2 } \right]
  • \left[ M ^ { -1 } L ^ { - 1 } T ^ { - 2 } \right]
Given  x = a + b t + c t ^ { 2 }  where  x  in metre and  t  in second. Find the dimensional formula of  b
  • L
  • L T ^ { - 1 }
  • L T ^ { - 2 }
  • L ^ { 2 }
The radius of nucleus is r = r_0 A^{{1}/{3}}, where A is mass number. The dimensions of r_0 is 
  • [MLT^{-2}]
  • [M^0 L^0 T^{-1}
  • [M^0 L T^0]
  • None of these
If L be the inductance, R resistance and C be the capacitance of a capacitor, then dimensional formula of \cfrac {L}{R} and RC are
  • M^oLT^{-1}ML ^oT^{-1}
  • M^oL^oT,MLT^o
  • M^oL^oT, 1
  • M^oL^oT, M^oL^oT
The dimensions of (\mu_{0}\epsilon_{0})^{-\dfrac {1}{2}} are
  • [L^{-\dfrac {1}{2}} T^{\dfrac {1}{2}}]
  • [L^{\dfrac {1}{2}} T^-{\dfrac {1}{2}}]
  • [L^{-1} T]
  • [L T^{-1}]
If C be the capacitance and V be the electric potential,then the dimensional formula of CV^2 is 
  • [ML ^{-3} TA]
  • [M^oLT^{-2} A^o]
  • [ML ^1 A^{-1 }]
  • [ML^2T^{-2} A^o]
Given  x = a + b t + c t ^ { 2 }  where  x  in metre and  t  in second. Find the dimensional formula of  C
  • L
  • L T ^ { - 1 }
  • L T ^ { - 2 }
  • L ^ { 2 } T ^ { 2 }
Given that m is the mass suspended from a spring  force constant k. The dimension of the formula for \sqrt{m/k} is same as that for 
  • frequency
  • time period
  • velocity
  • wavelength
Velocity gradient has dimension of
  • Force  
  • Frequency
  • Surface tension 
  • momentum 
The Earth's radius is 6371\ km. The order of magnitude of the Earth's radius is
  • 10^3
  • 10^2
  • 10^7
  • 10^5
The diagram shows a cuboid block made from a metal of density 2.5g/{cm}^{3}
What is the mass of the block?
1647084_f928bdb31fbb4bd0b578f2af7b6d3ebe.png
  • 8.0kg
  • 16kg
  • 50g
  • 100g
The dimensional formula of pressure is 
  • [MLT^{-2} ]
  • [ML^2T^{-2} ]
  • [ML^{-1}T^{-2} ]
  • [M^0L^{-1}T^{-2} ]
The dimension of \frac {1}{2} \varepsilon _ o E^2 ( \varepsilon _ o   is the permitivity of free space and E is electric field) is 
  • [ML^2T^{-1} ]
  • [ML^{-1} T^{2} ]
  • [ML^2 T^{-2} ]
  • [MLT^{-1} ]
In the density measurement of a cube, the mass an edge length are measured as \left( 10.00\pm 0.10 \right) kg and \left( 0.10\pm 0.01 \right) m, respectively. The error in the measurement of density:
  • 0.10kg/{m}^{3}
  • 0.31kg/{m}^{3}
  • 0.07kg/{m}^{3}
  • 0.01kg/{m}^{3}
  • No answer
The dimensional formula for the magnetic fields is 
  • [MT^{-2} A^{-1} ]
  • [ML^2T^{-1}A^{-2} ]
  • [MT^{-2}A^{-2}]
  • [MT^{-1} A^{-2}]
The dimension of Magnetic flux.
  • ML^{2}I^{-1}T^{-3}
  • ML^{2}I^{-4}T^{-2}
  • ML^{2}I^{-1}T^{-2}
  • None of these
Which of the following does not have the dimension of force?
  • Potential gradient
  • Energy gradient
  • Weight
  • Rate of change of momentum
If P and Q have different non-zero dimensions, which of the following operations is possible?
  • P+Q
  • PQ
  • P-Q
  • 1-\dfrac{P}{Q}
The pairs of physical quantities that have the same dimensions in (are):
  • Reynolds number and coefficient of friction
  • Curie and frequency of a light wave
  • Latent heat and gravitational potential
  • Planck's constant and torque
Taking frequency f, velocity v and density \rho to be the fundamental quantities then the dimensional formula for momentum will be?
  • \rho v^4f^{-3}
  • \rho v^3f^{-1}
  • \rho v f^2
  • \rho^2v^2f^2
If  x,v and a denote the displacement, the velocity and the acceleration of a particle
executing simple harmonic motion of time period T, then which of the following do not
change with time?
  • \dfrac{aT}{v}
  • aT+2\pi v
  • a^2T^2+4\pi^2 v^2
  • aT
  • vT
The dimensions of time constant are:
  • [M^0L^0T^0]
  • [M^0L^0T]
  • [MLT]
  • None of these
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