Test: International System of Units & Significant Figures (April 1) - JEE MCQ

Among the given physical quantities work is not a fundamental quantity whereas all other three physical quantities are fundamental quantities.

The SI units is based on seven base units. These are metre, kilogram second, ampere, kelvin mole and candela.

Among the given units metre is not a unit of British system whereas all other belong to this system.

Parsec is the unit of distance.
1 parsec = 3.08 x 10¹⁶ m
Parsec is the distance at which average radius of earth's orbit subtends an angle of 1 arc second.

The final result should be 3 significant figures.

Radius of the sphere, r = 1.41cm
(3 significant figures)
Volume of the sphere,

= 11.736 cm³
Rounded off upto 3 significant figures = 11.7 cm³.

Difference in masses
= m₂ - m₁ = 20.17 g - 20.15 g
= 0.02 g (correct upto two places of decimal)

Among the given quantities displacement gradient is a unitless quantity.

G = 6.67 × 10⁻¹¹ N m² kg⁻²
= 6.67 × 10⁻¹¹ × (kg m s⁻²)(m²)(kg)⁻²
= 6.67 × 10⁻¹¹ × [(1000 g) × (100 cm) × s⁻²] × (100 cm)² × (1000 g)⁻²
= 6.67 × 10⁻⁸ g⁻¹ cm³ s⁻²

= 4 × 10⁻² steradian