A greenhouse gas is a gas that produces heat in the atmosphere when its concentration increases.
A greenhouse gas is a gas that produces heat in the atmosphere when its concentration increases. It gets stuck in the environment and can't escape the internal layer of the atmosphere of Earth. These gases cause pollution as they contaminate the environment.
Examples of greenhouse gases: Carbon dioxide, Chlorofluorocarbon, Methane, sulphur dioxide, etc.
Therefore, oxygen is not a greenhouse gas.
Match the following:
List-I (Metal in drinking water) | List-II (Maximum prescribed concentration in ppm) |
---|---|
A) Mn | I) \( 0.05 \) |
B) Zn | II) \( 3.0 \) |
C) Cd | III) \( 0.005 \) |
D) Cu | IV) \( 5.0 \) |
A block of certain mass is placed on a rough floor. The coefficients of static and kinetic friction between the block and the floor are 0.4 and 0.25 respectively. A constant horizontal force \( F = 20 \, \text{N} \) acts on it so that the velocity of the block varies with time according to the following graph. The mass of the block is nearly (Take \( g = 10 \, \text{m/s}^2 \)):