NEET Practice Questions (MCQs) with Answers & Solutions

Wien’s law                               

Rayleigh  law

Planck’s law of radiation             

Stefan’s law of radiation

IR radiations are used for long distance photography

IR radiations arise due to inner electron transitions in atoms

IR radiations are detected by using a bolometer

Sun is the natural source of IR radiation

Radiation

Convection

Conduction

Temperature remains unchanged

1                 

0.5

0                 

Infinity

${\mathrm{\lambda }}_1$                     

${\mathrm{\lambda }}_2$

 ${\mathrm{\lambda }}_1$ and ${\mathrm{\lambda }}_2$         

  ${\mathrm{\lambda }}_1, {\mathrm{\lambda }}_2, {\mathrm{\lambda }}_3$ and ${\mathrm{\lambda }}_4$

Less heat and more cold           

More heat and more cold

More heat and less cold             

Less heat and less cold

e = a                     

$\mathrm{e}=\frac{1}{\mathrm{a}}$

 $\mathrm{e}={\mathrm{a}}^2$                    

$\mathrm{a}={\mathrm{e}}^2$

Rough surfaces are better radiators than smooth surface

Highly polished mirror like surfaces are very good radiators

Black surfaces are better absorbers than white ones

Black surfaces are better radiators than white

Ice covered with white cloth will melt more

Ice covered with black cloth will melt more

Equal ice will melt under both clothes

It will depend on the temperature of surroundings of ice

 ${\mathrm{e}}_{\mathrm{\lambda }}$= ${\mathrm{a}}_{\mathrm{\lambda }}$= ${\mathrm{E}}_{\mathrm{\lambda }}$          

${\mathrm{e}}_{\mathrm{\lambda }}$${\mathrm{E}}_{\mathrm{\lambda }}$=${\mathrm{a}}_{\mathrm{\lambda }}$

 ${\mathrm{e}}_{\mathrm{\lambda }}$= ${\mathrm{a}}_{\mathrm{\lambda }}$${\mathrm{E}}_{\mathrm{\lambda }}$              

 ${\mathrm{e}}_{\mathrm{\lambda }}$${\mathrm{a}}_{\mathrm{\lambda }}$${\mathrm{E}}_{\mathrm{\lambda }}$ = constant