CBSE Class 11 Physics Units and Measurements MCQs Set A

Question :  Which one of the following pairs of quantities and their units is a proper match?

a) Magnetic flux – weber

b) Capacitance – henry

c) Impulse – N/sec

d) Power – farad

Answer :  Magnetic flux – weber

Question :  One second is defined to be equal to

a) 9192631770 periods of the cesium clock

b) 1650763.73 periods of the cesium clock

c) 652189.63 periods of the krypton clock

d) 1650763.73 periods of the krypton clock

Answer :  9192631770 periods of the cesium clock

Question :  One yard in SI unit is equal to

a) 0.9144 metre

b) 1.0936 kilometre

c) 1.9144 metre

d) 0.09144 kilometre

Answer :  0.9144 metre

Question :  One pico farad is equal to

a) 10^–12 farad

b) 10^–24 farad

c) 10^–18 farad

d) 10^–6 farad

Answer :  10^–12 farad

Question :  ‘Torr’ is the unit of

a) pressure

b) volume

c) density

d) flux

Answer :  pressure

Question :  Very large distances such as the distance of a Planet or a star from Earth can be measured by

a) Parallax method

b) All of these

c) Millikan’s oil drop method

d) Spectrograph

Answer :  Parallax method

Question :  Joule second is a unit of

a) angular momentum

b) torque

c) energy

d) power

Answer :  angular momentum

Question :  Temperature can be expressed as derived quantity in terms of

a) None of these

b) mass and time

c) length and mass

d) length, mass and time

Answer :  None of these

Question :  Unit of specific resistance is

a) ohm – m

b) ohm/m

c) ohm m³

d) ohm/m²

Answer :  ohm – m

Question :  Unit of magnetic moment is

a) ampere–metre²

b) weber–metre²

c) ampere–metre

d) weber/metre

Answer :  ampere–metre² 

Question :  Dimensional analysis can be applied to

a) All of these

b) to convert from one system of units to another

c) deduce relations among the physical quantities

d) check the dimensional consistency of equations

Answer :  All of these

Question :  The dimensions of pressure is equal to

a) energy per unit volume

b) energy

c) force

d) force per unit volume

Answer :  energy per unit volume

Question :  Which is dimensionless?

a) Force/acceleration

b) Velocity/acceleration

c) Energy/work

d) Volume/area

Answer :  Force/acceleration

Question :  The division of energy by time is X. The dimensional formula of X is same as that of

a) power

b) electric field

c) momentum

d) torque

Answer :  power

Question :  Which of the following is a dimensional constant?

a) Gravitational constant

b) Dielectric constant

c) Refractive index

d) Relative density

Answer :  Gravitational constant

Question :  The magnitude of the difference between the individual measurement and true value of the quantity is called

a) absolute error

b) relative error

c) None of these

d) percentage error

Answer :  absolute error

Question :  Systematic errors can be

a) either positive or negative

b) negative only

c) positive only

d) None of these

Answer :  either positive or negative

Question :  Random error can be eliminated by

a) taking large number of observations and then their mean

b) measuring the quantity with more than one instrument

c) eliminating the cause

d) careful observation

Answer :  taking large number of observations and then their mean