Units, Dimensions and Errors MCQ Question with Answer

Units, Dimensions and Errors MCQ with detailed explanation for interview, entrance and competitive exams. Explanation are given for understanding.

Question No : 1
Which of the following does not have the same
dimension?

Electric flux, electric field, electric dipole moment

pressure, stress, Young's modulus

Electromotive force, potential difference, electric
voltage

Heat, potential energy, work done.

Question No : 2
The ratio of the dimension of Planck's constant and
that of moment of inertia is the dimension of

time

frequency

angular momentum

velocity

Question No : 3
Out of the following pair, which one does not have the
same dimensions?

angular momentum and Planck's constant

impulse and momentum

moment of inertia and moment of force

work and torque.

Question No : 4
Parsec is the unit of

time

distance

frequency

angular acceleration

Question No : 5
A. Specific gravity of a fluid is a dimensionless quantity
R . It is the ratio of density of fluid to density of water

both A and R are correct and R is the correct
explanation of A.

both A and R are correct but R is not the correct
explanation of A

A is correct but R is false

both A and R are false

Question No : 6
A force $F$ is given by $F = a t + b t^{2}$ where $t$ is time, what are the dimension of $a$ and $b$ .

M L T^{1}, M L T^{0},

M L T^{3}, M L^{2} T^{4},

M L T^{- 4}, M L T^{- 4},

M L^{- 3} T, M L T^{- 4},

Question No : 7
Which of the following is not a unit of Young's modulus?

N m^{- 1}

N m^{- 2}

d y n e c m^{- 2}

m e g a p a s c a l