In the rainy season,on a clear night,the black seat of a bicycle becomes wet because:

What would happen if the greenhouse effect were not present?

Heat radiations propagate with the speed of

If $E$ is the total energy emitted by a body at temperature $T \ K$ and $E_{max}$ is the maximum energy emitted by it at the same temperature,then:

Select the incorrect statement.

The following figure shows two air-filled bulbs connected by a $U$-tube partly filled with alcohol. One bulb is painted black and the other is painted white (or silver/shiny). What happens to the levels of alcohol in the limbs $X$ and $Y$ when an electric bulb placed midway between the two bulbs is lighted?