Question : Find the value of $\frac{\frac{1}{3} + \frac{1}{4}[\frac{2}{5}-\frac{1}{2}]}{1\frac{2}{3} \text{of} \frac{3}{4}-\frac{3}{4} \text{of} \frac{4}{5}}$.

Option 1: $\frac{37}{78}$

Option 2: $\frac{37}{13}$

Option 3: $\frac{74}{78}$

Option 4: $\frac{74}{13}$

Question : The percentage of oxygen in the air is approximately:

Option 1: 100%

Option 2: 1%

Option 3: 78%

Option 4: 21%

Question : The highest volume of gases in the lower atmosphere is comprised of

Option 1: Hydrogen

Option 2: Carbon dioxide

Option 3: Oxygen

Option 4: Nitrogen

Question : Directions: Which of the following numbers will replace the question mark (?) in the given series?
29, 36, 44, 53, 63, ?

Option 1: 74

Option 2: 76

Option 3: 78

Option 4: 72

Question : The chief source for the production of nitrogenous fertilizers is:

Option 1: Ammonia

Option 2: Nitric acid

Option 3: Nitrogen

Option 4: Nitrogen dioxide