Physical World and Measurement

SI unit of permittivity is

Options

(a) C²m²N² (b) C²m⁻²N⁻¹ (c) C²m²N⁻¹ (d) C⁻¹m²N²

Correct Answer:

C²m⁻²N⁻¹

Explanation:

Coloumb force is F = (1/4πε₀) (q₁q₂/r²) Substituting the units of all, we get N = […]

The unit of thermal conductivity is

Options

(a) Wm⁻¹K⁻¹ (b) JK⁻¹ (c) WmK (d) JK

Correct Answer:

Wm⁻¹K⁻¹

Explanation:

The heat current related to difference of temperature across the length l of a […]

Pascal-second has the dimensions of

Options

(a) force (b) energy (c) pressure (d) coefficient of viscosity

Correct Answer:

coefficient of viscosity

Explanation:

Pascal second (Ns/m²) is the unit of dynamic viscosity and its […]

The magnetic moment has dimensions of

Options

(a) [LA] (b) [L²A] (c) [LT⁻¹A] (d) [L²T⁻¹A]

Correct Answer:

[L²A]

Explanation:

No explanation available. Be the first to write the explanation for this question by […]

Dimensions of electrical resistance are

Options

(a) [ML²T⁻³A⁻¹] (b) [ML²T⁻³A⁻²] (c) [ML³T⁻³A⁻²] (d) [ML²T³A²]

Correct Answer:

[ML²T⁻³A⁻²]

Explanation:

No explanation available. Be the first to write the explanation for this question by […]

Dimensions formula for surface tension is

Options

(a) [M²L⁰T⁻²] (b) [ML⁰T⁻²] (c) [M⁰LT⁻¹] (d) [M²L²T⁻¹]

Correct Answer:

[ML⁰T⁻²]

Explanation:

No explanation available. Be the first to write the explanation for this question by […]

The number of significant figures in 0.06900

Options

(a) 5 (b) 4 (c) 2 (d) 3

Correct Answer:

4

Explanation:

No explanation available. Be the first to write the explanation for this question […]

The dimensions of universal gas constant are

Options

(a) [ML²T⁻²θ⁻¹] (b) [M²LT⁻²θ] (c) [ML³T⁻²θ⁻¹] (d) None of these

Correct Answer:

[ML²T⁻²θ⁻¹]

Explanation:

According to Ideal gas equation,  PV = nRT where P is the […]

Which of the following measurement is most precise?

Options

(a) 5.00 mm (b) 5.00 cm (c) 5.00 m (d) 5.00 km

Correct Answer:

5.00 mm

Explanation:

Precision is the degree to which […]