CBSE Questions for Class 11 Engineering Physics Units And Measurement Quiz 4 - MCQExams.com

The dimensions of torque are
  • $$[MLT^{-2}]$$
  • $$[ML^2T^{-2}]$$
  • $$[ML^2T^{-1}]$$
  • $$[M^2L^2T^{-2}]$$
How many order of magnitude are there in one million?
  • 5
  • 4
  • 6
  • None of above
Dimensional formula of power is
  • $$[M^2L^2T^{-2}]$$
  • $$[ML^2T^{-3}]$$
  • $$[M^2LT^{-2}]$$
  • $$[MLT^{-2}]$$
The thickness of a metal sheet is measured to be $$326 mm$$. Express its order of magnitude in mm.
  • $$10^0$$
  • $$10^1$$
  • $$10^2$$
  • $$10^3$$
1 $$\mathring{A}$$ is equal to :
  • $$0.1$$ nm
  • $$10^{-10}$$ cm
  • $$10^{-8} m$$
  • $$10^{-4} \mu$$.
The dimensions of magnetic field in $$M, L, T$$ and $$C$$ (coulomb) are given as
  • $$[MLT^{-1}C^{-1}]$$
  • $$[MT^{2}C^{-2}]$$
  • $$[MT^{-1}C^{-1}]$$
  • $$[MT^{-2}C^{-1}]$$
Which of the following quantities has a unit but dimensionless?
  • Strain
  • Reynolds number
  • Angular displacement
  • Poisson's ratio
Using mass $$(M)$$, length $$(L)$$, time $$(T)$$ and current $$(A)$$ as fundamental quantities, the dimension of permeability is
  • $$\displaystyle \left [ M^{-1}LT^{-2}A \right ]$$
  • $$\displaystyle \left [ ML^{-2}T^{-2}A^{-1} \right ]$$
  • $$\displaystyle \left [ MLT^{-2}A^{-2} \right ]$$
  • $$\displaystyle \left [ MLT^{-1}A^{-1} \right ]$$
The quantity/ quantities that does/do not have mass in its/their dimensions is/are : 
  • specific heat
  • latent heat
  • electrical potential difference
  • electrical resistance
Count total number of Significant Figures in 3.0800
  • 3
  • 5
  • 1
  • 2
Count total number of significant figures in 3500
  • 1
  • 2
  • 3
  • 4
Dimensional formula of power is :
(West Bengal/NTSE Stage-l/2013)
  • $$[M^{2}L^{2}T^{-2}]$$
  • $$[ML^{2}T^{-3}]$$
  • $$[M^{2}LT^{-3}]$$
  • $$[MLT^{-2}]$$
A physical quantity $$X$$ is expressed as velocity $$\displaystyle =\sqrt{\dfrac{X}{Density}}$$ The dimension of $$X$$ are 
  • $$ML^{-1}T^{-2}$$
  • $$MLT^{-2}$$
  • $$MLT^{-1}$$
  • $$ML^{-1}T^{-3}$$
Count total number of significant figures in 0.00418
  • 5
  • 4
  • 3
  • 6
The magnetic moment has dimensions of
  • $$\left [LA\right ]$$
  • $$\left [L^{2}A\right ]$$
  • $$\left [LT^{-1} A\right ]$$
  • $$\left [L^{2} T^{-1} A\right ]$$
Which of the following physical quantities do not have same dimensions?
  • Pressure and stress
  • Tension and surface tension
  • Strain and angle
  • Energy and work
Which of the following pair of quantities do not have the same dimensions?
  • Potential gradient, electric field
  • Torque, kinetic energy
  • Light year, time period
  • Impedance, reactance
The thickness of a newspaper sheet is of the order of 
  • 0.1 m
  • 0.1 cm
  • 0.1 mm
  • 1 micrometre
If the units of mass, length and time are doubled, then what happen to the unit of 'relative density'?
  • doubled
  • remains same
  • tripled
  • equatrepled
State whether the following statement is True or False. 
The prefix used for $$\displaystyle { 10 }^{ 3 }$$ is kilo.
  • True
  • False
The prefix used for denoting an order of magnitude of $$\displaystyle { 10 }^{ 6 }$$ is ___________.
  • Giga
  • Kilo
  • Mega
  • Micro
The dimensions of Planck's constant are
  • $$\left [ML^{-3} T^{-1}\right ]$$
  • $$\left [ML^{-2} T^{-1}\right ]$$
  • $$\left [M^{0}L^{-1} T^{-3}\right ]$$
  • $$\left [ML^{2} T^{-1}\right ]$$
The error in measurement caused by positioning the eye incorrectly is called
  • parallel error
  • standard error
  • eye error
  • parallax error
Why are metre scales are made very thin?
  • To avoid breakage and parallax
  • To avoid parallax and error in measurement
  • To avoid breakage and error in measurement
  • To make it cheap
Which of the following is not a reading of meter scale?
  • $$2.5 cm$$
  • $$15 cm$$
  • $$1.5 mm$$
  • $$0.4 m$$
The relation between force 'F' and density 'd' is $$F=\displaystyle\frac{x}{\sqrt d}$$. The dimensions of $$x$$ are
  • $$\displaystyle [L^{-1{/2}}M^{3{/2}}T^{-2}]$$
  • $$\displaystyle [L^{-1{/2}}M^{1{/2}}T^{-2}]$$
  • $$\displaystyle [L^{-1}M^{3{/2}}T^{-2}]$$
  • $$\displaystyle [L^{-1}M^{1{/2}}T^{-2}]$$
Which method is used by astronomers to calculate how far the star is?
  • Parallax
  • Equillax
  • Purplex
  • None
The dimensional formula for Reynold's number is ________.
  • $$[L^0M^0T^0]$$
  • $$[L^1M^1T^1]$$
  • $$[L^{-1}M^1T^1]$$
  • $$[L^1M^1T^{-1}]$$
The dimensions of Planck's constant is the same as the product of
  • force and time
  • force, displacement and time
  • force and distance
  • time and displacement
The physical quantity having the dimensions $$\displaystyle \left[ { M }^{ -1 }{ L }^{ -3 }{ T }^{ 3 }{ A }^{ 2 } \right] $$ is :
  • Resistance
  • Resistivity
  • Electrical conductivity
  • Electromotive force
Which of the following is the parallax angle in the shown diagram?
508699_0fdb3a64352e4b7d88f7a65c15c7fbbb.png
  • d
  • p
  • q
  • r
Parallax method is suitable for the measurement of:
  • ball
  • planet
  • vehicle
  • distance between cities
What is the approximation made in the parallax method?
  • All distances measured between two points on earth is zero.
  • All distances measured between two points on earth is constant.
  • Distance between a point on the earth and the planet is very large as compared to the distance between two points on earth's surface.
  • No approximation is made.
The relation between $$\theta$$ , $$b$$ and $$D$$ is:
(where $$\theta$$ is the parallax angle, $$b$$ is the distance between two points of separation, $$D$$ is the distance of source from any point of observation)
  • $$\theta = \dfrac{b}{D}$$
  • $$\theta=\dfrac{D}{b}$$
  • $$\theta = b\times D$$
  • $$\theta = b^2\times D$$
Which of the following represent the number 300,000,000 :
  • $$3 \times  10^6$$
  • $$3 \times  10^7$$
  • $$3 \times  10^8$$
  • $$3 \times  10^9$$
  • $$3 \times  10^{-9}$$

Students A,B and C measure the diameter of a copper ball using the same screw gauge. A takes 5 readings, B takes 9 readings and C takes 8 readings. The measured value will be most accurate for
  • B
  • A
  • C
  • all
$$1$$ femtometre is equivalent to 
  • $$10^{15} m$$
  • $$10^{-12} m$$
  • $$10^{-15} m$$
  • $$10^{-9} m$$
Which of the following is the best method to measure microscopic distances?
  • Optical microscope
  • Meter scale
  • Screw gauge
  • Diffraction pattern
Which of the following is the smallest unit?
  • millimetre
  • angstrom
  • fermi
  • metre
To minimise parallax error, the observer should place the object :
  • as near to the scale of the ruler as possible and the eye must be directly above the scale
  • as far to the scale of the ruler as possible and the eye must be directly above the scale
  • as near to the scale of the ruler as possible and the eye must be to the right of the scale
  • as near to the scale of the ruler as possible and the eye must be to the left of the scale
Parallax method is useful 
  • for measuring speed of the light.
  • for measuring distances of star.
  • for finding the intensity of the light.
  • None of the above.
If $$n$$ denotes a positive integer, $$h$$ the Plancks constant, $$q$$ the charge and $$B$$ the magnetic field, then the quantity $$\begin{pmatrix} \dfrac{nh}{2\pi qB}\end{pmatrix}$$ has the dimension of
  • Area
  • Length
  • Speed
  • Acceleration
Parallax is the apparent displacement of an object because of:
  • change in observer's point of view
  • change in object's position
  • changes both in observers point of view and object's position
  • consistency in observer's point of view
The effect of parallax is used to measure:
  • distances to nearby objects
  • distances to nearby stars
  • nearness of atoms in substances
  • the object and image distance in optical experiments
Which of the following statements regarding dimensions is correct?
  • The dimension of any physical quantity includes the power fundamental physical quantities.
  • Radian is a fundamental physical quantity having dimension.
  • Mutual inductance has no dimension.
  • Dimension of work is same as rate of work done
In which of the following pairs, the two physical quantities have different dimensions?
  • Plancks constant and angular momentum
  • Impulse and linear momentum
  • Moment of inertia and moment of a force
  • Energy and torque
Parallax method is based on which of the following principle?
  • Disparity
  • Lutz Kelker bias
  • Trilateration
  • Triangulation
Error due to eye vision is termed as :
  • climax error
  • sight error
  • parallax error
  • visional error
A star's distance ($$d$$) and its parallax angle ($$p$$) are related to each other as:
  • $$d=\dfrac{1}{p}$$
  • $$d=\dfrac{1}{p^2}$$
  • $$p=\dfrac{1}{d^2}$$
  • none of these
A physical quantity has term of velocity,and force which are proportional to it .It is known that it does not depend on any other physical quantity ,so its dimension can be,
  • $$ML^{2}T^{-3}$$
  • $$MLT^{3}$$
  • $$ML^{2}T^{3}$$
  • none of the above
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