Question : The Particulate Matter ( PM - 10 ) exhaled from the polluted atmosphere is often filtered out during the process of:

Option 1: Coughing

Option 2: Sneezing

Option 3: A and B

Option 4: Urination

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 : 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 : If $a − b = 8$ and $ab = 9$, then the value of $a + b$ is ______.

Option 1: $\pm 9$

Option 2: $\pm 7$

Option 3: $\pm 8$

Option 4: $\pm 10$

Question : Oxygen liberated during photosynthesis comes from:

Option 1: Carbon dioxide

Option 2: Water

Option 3: Breakdown of chlorophyll

Option 4: Atmosphere

Question : The value of $\sqrt{–\sqrt{3}+\sqrt{3+8\sqrt{7+4\sqrt{3}}}}$ is:

Option 1: 2

Option 2: 4

Option 3: $\pm 2$

Option 4: –2