UNIT I: Nature of Physical World and Measurement - Online Test

Q1. The density of a material in CGS system of units is 4 g cm-3 . In a system of units in which unit of length is 10 cm and unit of mass is 100 g, then the value of density of material will be
Answer : Option C
Explaination / Solution:
No Explaination.


Q2. If the force is proportional to square of velocity, then the dimension of proportionality constant is
Answer : Option D
Explaination / Solution:
No Explaination.


Q3. The dimension of (μ0ε0)1/2  is
Answer : Option C
Explaination / Solution:
No Explaination.


Q4. Planck’s constant (h), speed of light in vacuum (c) and Newton’s gravitational constant (G) are taken as three fundamental constants. Which of the following combinations of these has the dimension of length?.
Answer : Option A
Explaination / Solution:
No Explaination.


Q5.

A length-scale (l) depends on the permittivity (ε) of a dielectric material, Boltzmann constant ( kB), the absolute temperature (T), the number per unit volume (n) of certain charged particles, and the charge (q) carried by each of the particles. Which of the following expression for l is dimensionally correct?

Answer : Option B
Explaination / Solution:
No Explaination.