MCQ
Which of the following statements is wrong
  • A
    Rough surfaces are better radiators than smooth surface
  • Highly polished mirror like surfaces are very good radiators
  • C
    Black surfaces are better absorbers than white ones
  • D
    Black surfaces are better radiators than white

Answer

Correct option: B.
Highly polished mirror like surfaces are very good radiators
(b) Highly polished mirror like surfaces are good reflectors, but not good radiators.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Similar questions

When current flows through a conductor, then the order of drift velocity of electrons will be
Fundamental frequency of pipe is $100 \mathrm{~Hz}$ and other two frequencies are $300 \mathrm{~Hz}$ and $500 \mathrm{~Hz}$ then
Solid targets of different elements are bombarded by highly energetic electron beams. The frequency $(f)$ of the characteristic Xrays emitted from different targets varies with atomic number $Z$ as
The string of pendulum of length $l$ is displaced through $90^{\circ}$ from the vertical and released. Then the minimum strength of the string in order to withstand the tension, as the pendulum passes through the mean position is
A person cannot see distinctly at the distance less than one metre. Calculate the power of the lens that he should use to read a book at a distance of $25 \mathrm{~cm}$
The first law of thermodynamics is concerned with the conservation of
Initial pressure and volume of a gas are $P$ and $V$ respectively. First it is expanded isothermally to volume $4 \mathrm{~V}$ and then compressed adiabatically to volume $V$. The final pressure of gas will be
A body of mass $m$ is taken from earth surface to the height $h$ equal to radius of earth, the increase in potential energy will be
A ${ }^{238} U$ nucleus decays by emitting an alpha particle of speed $v m s^{-1}$. The recoil speed of the residual nucleus is (in $m s^{-1}$ )
The carrier frequency generated by a tank circuit containing $1 n F$ capacitor and $10 \mu \mathrm{H}$ inductor is