CBSE Questions for Class 11 Engineering Physics Units And Measurement Quiz 5 - MCQExams.com

The extent to which a given measurement agrees with the standard value for that measurement is known as :
  • Accuracy
  • Precision
  • Accuracy and Precision
  • None of these
The ratio of dimensions electric field and magnetic field is,
  • $$MT^{1}L^{-1}$$
  • $$MT^{-1}L^{-2}$$
  • $$MT^{2}L^{-1}$$
  • $$LT^{-1}$$
On dividing  dimension of gravitational constant by the dimension of surface tension we get
  • $$M$$
  • $$ML^{2}$$
  • $$M^{-2}L^{3}$$
  • None of he above
The mass of an object is measured by two students (true weight is 12 kg)
Student 1: He measures 12 kg
Student 2: She measures 12.5 kg
Measurement of which student is more accurate.
  • Student 1
  • Student 2
  • Both are equally accurate
  • Cannot be compared.
In lab one student obtained a weight measurement of $$3.2 kg$$ for a given substance, but the actual or known weight is $$10 kg$$, then his measurement is :
  • accurate
  • not accurate
  • precised
  • not presiced
The dimensions $$[ML^{-1}T^{-2}]$$ may be of
  • pressure
  • energy per unit volume
  • force
  • linear momentum
The dimensions of $$\dfrac{QV}{C}$$ is,($$Q$$=charge,$$V$$=voltage,$$C$$=capacitance,take dimension of current as $$k$$)
  • $$M^{2}L^{-4}T^{-6}k^{-1}$$
  • $$M^{2}L^{4}T^{-6}k^{-2}$$
  • $$M^{2}L^{-4}T^{6}k^{-2}$$
  • $$M^{2}L^{4}T^{-6}k^{1}$$
 Dimension of energy in terms of force ($$F$$), length( $$L$$) and time ($$T$$) is
  • $$F$$$$L$$
  • $$L$$$$T$$
  • $$LF\times\dfrac{1}{T}$$
  • none of the above
________ refers to the degree of conformity and correctness of something when compared to a true or absolute value. Fill the appropriate answer.
  • Accuracy
  • Precision
  • Accuracy and Precision
  • None of these
________ reflects quality of measuring instrument.
  • Precision
  • Accuracy
  • Accuracy and Precision
  • None of these
The degree to which several measurement provide answer very close to each other is known as:
  • Accuracy
  • Precision
  • Accuracy and Precision
  • None of these
Which of the following pair of quantities do not have the same dimensions?
  • Light year,time period
  • Light year,distance
  • Impedance,resistance
  • None of these
Match the following.
List IList II
A.Angular momentum1.$$[M^{-1}L^2T^{-2}]$$
B.Torque2.$$[M^1T^{-2}]$$
C.Gravitational constant3.$$[M^1L^2T^{-2}]$$
D.Tension4.$$M^1L^2T^{-1}]$$
  • C-2, D-1
  • A-4, B-3
  • A-3, C-2
  • B-2, A-1
Which of the following is not a unit of mass?
  • Slug
  • Kilogram
  • Ton
  • Newton
The dimensions of universal gravitational constant are ___________.
  • $$\left[ { L }^{ 1 }{ M }^{ 0 }{ T }^{ 0 } \right] $$
  • $$\left[ { L }^{ 2 }{ M }^{ 1 }{ T }^{ 0 } \right] $$
  • $$\left[ { L }^{ -1 }{ M }^{ 1 }{ T }^{ -2 } \right] $$
  • $$\left[ { L }^{ 3 }{ M }^{ -1 }{ T }^{ -2 } \right] $$
_______ refers to a state of strict exactness.Fill the appropriate answer.
  • Accuracy
  • Precision
  • Accuracy and Precision
  • None of these.
If we weigh a given substance five times, and get 5 kg each time, then your measurement is very __________.
  • Accurate
  • Precised
  • Accurate and Precised
  • Cannot be judged
Accuracy of potentiometer can be easily increased by :
  • increasing resistance of wire
  • decreasing resistance of wire
  • increasing the length of wire
  • decreasing the length of wire
The relation between force '$$F$$' and density '$$d$$' is $$F=\displaystyle\frac{x}{\sqrt{d}}$$. The dimensions of $$x$$ are:
  • $$[L^{-1_{/2}}M^{3_{/2}}T^{-2}]$$
  • $$[L^{-1_{/2}}M^{1_{/2}}T^{-2}]$$
  • $$[L^{-1}M^{3_{/2}}T^{-2}]$$
  • $$[L^{-1}M^{1_{/2}}T^{-2}]$$
Dimensions $$[ML^{-1}T^{-1}]$$ are related to
  • Torque
  • Work
  • Energy
  • Coefficient of viscosity
If acceleration ($$A$$), mass ($$M$$), velocity ($$V$$), time ($$T$$) are the fundamental units, then the dimensions of height will be
  • $$V{ T }^{ -1 }{ M }^{ 2 }\quad $$
  • $$AM{ T }^{ -1 }$$
  • $${ A }^{ -1 }{ M }^{ 3 }{ V }^{ -1 }$$
  • $$A{ T }^{ 2 }$$
The dimension of universal gravitational constant is :
  • $$[M^{-2}L^{-3}T^{-2}]$$
  • $$[M^{-2}L^2T^{-1}]$$
  • $$[M^{-1}L^3T^{-2}]$$
  • $$[ML^2T^{-1}]$$
The pressure on a square plate is measured by measuring the force on the plate. If the maximum error in the measurement of force and length are respectively $$4\%$$ and $$2\%$$, then the maximum error in the measurement of pressure is :
  • $$1\%$$
  • $$2\%$$
  • $$4\%$$
  • $$8\%$$
Are senses reliable for accurate measurement?
  • True
  • False
The dimension of the universal constant of gravitation $$G$$ is
  • $$\left[ M{ L }^{ 2 }{ T }^{ -1 } \right] $$
  • $$\left[ { M }^{ -1 }{ L }^{ 3 }{ T }^{ -2 } \right] $$
  • $$\left[ { M }^{ -1 }{ L }^{ 2 }{ T }^{ -2 } \right] \quad $$
  • $$\left[ M{ L }^{ 3 }{ T }^{ -2 } \right] \quad $$
Which one of the following pair of quantities has same dimension?
  • Force and work done
  • Momentum and impulse
  • Pressure and force
  • Surface tension and stress
Which of the following physical quantities has a unit but no dimensions?
  • Relative velocity
  • Relative density
  • Angle
  • Energy
Possible errors with screw gauge are
  • Systematic error
  • Backlash error
  • Personal error
  • All these
The dimension of permittivity ($${ \varepsilon  }_{ 0 }$$) are ______. Take $$Q$$ as the dimension of charge.
  • $${ M }^{ 1 }{ L }^{ -2 }{ T }^{ -2 }{ Q }^{ -2 }$$
  • $${ M }^{ -1 }{ L }^{ -3 }{ T }^{ 2 }{ Q }^{ 2 }$$
  • $${ M }^{ -1 }{ L }^{ 2 }{ T }^{ -3 }{ Q }^{ -1 }\quad $$
  • $${ M }^{ -1 }{ L }^{ 3 }{ T }^{ -2 }{ Q }^{ -2 }\quad $$
The error which follows a particular rule is
  • Personal error
  • Systematic error
  • Random error
  • Gross error
The order of magnitude of $$379$$ is
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
Which of the following is dimensionless?
  • Force/acceleration
  • Velocity/acceleration
  • Volume/area
  • Energy/work
If the speed of light (c), acceleration due to gravity (g) and pressure (p) are taken as fundamental units, the dimensions of gravitational constant (G) are:
  • $$c^0gp^{-3}$$
  • $$c^2g^3p^{-2}$$
  • $$c^0g^2p^{-1}$$
  • $$c^2g^2p^{-2}$$
The number of significant figures in $$0.00210$$ is
  • five
  • six
  • four
  • three
Calculate area enclosed by a circle of diameter $$1.06\ m$$ to correct number of significant figures.
  •  $$ 0.883 m^2$$
  •  $$ 0.0883 m^2$$
  •  $$ 0.88333 m^2$$
  •  $$ 0.8830 m^2$$
Subtract $$2.5 \times {10}^{4}$$ from $$3.9 \times {10}^{5}$$ and give the answer to correct number of significant figures.
  •  $$ 3.6\times 10^6$$
  •  $$ 3.6\times 10^5$$
  •  $$ 36\times 10^5$$
  •  $$ 36\times 10^6$$
The order of magnitude of 0.00701 is:
  • -3
  • -1
  • 2
  • 1
The amplitude of a damped oscillator of mass $$'m'$$ varies with the time  't' as $$A=A_0e^{-at/m}$$. The dimension of $$'a'$$ are:
  • $$ML^0T^{-1}$$
  • $$M^0LT^{-1}$$
  • $$MLT^{-1}$$
  • $$ML^{-1}T$$
If $$y$$ represents the pressure and $$x$$ represents the position then dimensional expression of $$\int { \dfrac { dx }{ \sqrt { p^{ 2 }- y^2}  }  } $$
  • $$[ML^2T^{-2}]$$
  • $$[M^{-1}L^2T^{2}]$$
  • $$[M^{-1}L^2T^{-2}]$$
  • $$[ML^2T^{2}]$$
If 'muscle times speed equals power', then what is the ratio of the $$SI$$ unit and the $$CGS$$ unit of muscle?
  • $$10^{5}$$
  • $$10^{3}$$
  • $$10^{7}$$
  • $$10^{-5}$$
Dimensional formula of $$\dfrac{megnetic\, flux}{electric\, flux}$$ is 
  • $$[LT^{-1}]$$
  • $$[TL^{-1}]$$
  • $$[L^3T^2 A^{-2}]$$
  • $$[M^0L^0T^0]$$
The dimensions of a modulus of elasticity are:
  • [$$MLT^{-2}$$]
  • [$$M^{2}L^{-1}T^{-2}$$]
  • [$$ML^{-1}T^{-2}$$]
  • [$$ML^{-2}T^{-2}$$]
Dimensional formula for pressure head is 
  • $$[M^0L^0T^0]$$
  • $$[ML^{-1}T^{-2}]$$
  • $$[M^0L^1T^{-2}]$$
  • $$[M^0L^1T^0]$$
Round off to $$3$$ significant figures,
a) $$20.96$$
b) $$0.0003125$$
  • $$21.0, 312\times 10^{-4}$$
  • $$21.0, 3.12\times 10^{-4}$$
  • $$2.10, 3.12\times 10^{-2}$$
  • $$210, 3.12\times 10^{-4}$$
Which one of the following does not have the same dimensions 
  • Work and energy
  • Angle and strain
  • Relative density and refractive index
  • Plank constant and energy
Dimension of work done is
  • $$\left[ L ^ { 2 } M ^ { 1 } T ^ { -2} \right]$$
  • $$\left[ L ^ { 2 } M ^ { 2 } T ^ { 2 } \right]$$
  • $$\left[ L ^ { 2 } M ^ { 0 } T ^ { 0 } \right]$$
  • $$\left[ L ^ { 2 } M ^ { 2 } T ^ { -3 } \right]$$
$$L^{-1}M^{1}T^{-2}$$ are the dimension for________.
  • Pressure
  • Power
  • Force
  • Work
Of the following pairs of physical quantities, which one is dimensionally odd?
  • Stress and pressure
  • Energy and work
  • Young's modulus and stress
  • Frequency and angle
Dimensional formula of pressure is :
  • $$[ML^{-1} T^{-2}]$$
  • $$[ML^{-2} T^{-1}]$$
  • $$[M^{-1} LT^{-2}]$$
  • $$[ML^{-2} T]$$
Velocity gradient has same dimensional formula as:
  • Angular frequency
  • Angular momentum
  • Velocity
  • None of these
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