Question : Thinner particles responsible for deteriorating the air - quality resulting in the damage of vital organs are referred as PM:

Option 1: 15.5

Option 2: 10.5

Option 3: 2.5

Option 4: 20.5

Question : Air quality depicting PM - 2.5 is more hazardous to:

Option 1: Archaeological Monuments

Option 2: National Parks

Option 3: Botanical Garden

Option 4: Old Men and Women

Question : If $(x+\frac{1}{x}):(x-\frac{1}{x})=5 : 3$, then the value(s) of $x$ is/are:

Option 1: $\pm 1$

Option 2: $\pm 2$

Option 3: $\pm 3$

Option 4: $0$

Question : The antiparticle of an electron is

Option 1: Positron

Option 2: Proton

Option 3: Alpha particles

Option 4: Beta particles

Question : The square root of $\frac{2+\sqrt{3}}{2}$ is:

Option 1: $\pm \frac{1}{\sqrt{2}}(\sqrt{3}+1)$

Option 2: $\pm \frac{1}{2}(\sqrt{3}-2)$

Option 3: $\text{none}$

Option 4: $\pm \frac{1}{2}(\sqrt{3}+1)$

Question : Removal of carbon particles from air involves the principles of

Option 1: Precipitation

Option 2: Filtration

Option 3: Electrophoresis

Option 4: Sedimentation