Units and Measurements
Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is a derived unit in the SI system?

Derived units are obtained by combining base units. Examples include the Newton (N), Joule (J), and Pascal (Pa).

Metre (m)
Candela (cd)
Newton (N)
Kelvin (K)
3

Which physical quantity is dimensionless?

Dimensionless quantities are those without any physical dimensions, like angles and refractive index.

Angular displacement
Force
Pressure
Density
1

The SI unit of luminous intensity is:

The SI unit of luminous intensity is the candela (cd).

Watt
Lumen
Candela
Lux
3

Which of the following has the same dimensional formula as momentum?

Momentum is given by \( p = mv \) with dimensional formula \([MLT^{-1}]\).

Force
Impulse
Energy
Power
2

The number of significant figures in \( 0.000560 \) is:

Leading zeros are not counted as significant figures. Only the digits 5, 6, and the trailing 0 are significant.

2
3
4
5
2

Dimensional formula of work done is:

Work is the product of force and displacement. Hence its dimensional formula is \([ML^2T^{-2}]\).

\([MLT^{-2}]\)
\([ML^2T^{-2}]\)
\([M^2L^2T^{-3}]\)
\([ML^2T^{-1}]\)
2

Which of the following pairs have the same dimensions?

Torque and work both have the dimensional formula \([ML^2T^{-2}]\).

Force and Energy
Work and Torque
Pressure and Power
Momentum and Energy
2

One angstrom is equal to:

One angstrom (\( \text{Å} \)) is a unit of length equal to \( 10^{-10} \) m.

\( 10^{-8} \) m
\( 10^{-9} \) m
\( 10^{-10} \) m
\( 10^{-12} \) m
3

Which of the following is a dimensionless constant?

Refractive index is the ratio of two similar quantities (speed of light), making it dimensionless.

Gravitational constant
Refractive index
Planck’s constant
Boltzmann constant
2

Which of the following quantities has different dimensions?

Pressure has the dimensional formula \([ML^{-1}T^{-2}]\) while the others represent forms of energy or work.

Work
Energy
Pressure
Torque
3

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