Question : Which element was arbitrarily assigned a value of 4.0 in the 'Halogens' section in 1922 by Linus Pauling, an American scientist?

Option 1: Fluorine

Option 2: lodine

Option 3: Astatine

Option 4: Bromine

Question : Teeth and Bones acquire strength and rigidity from

Option 1: Calcium

Option 2: Fluorine

Option 3: Chlorine

Option 4: Sodium

Question : If $\cos\theta = \frac{35}{37}$, then what is the value of $\cot \theta$?

Option 1: $\frac{12}{35}$

Option 2: $\frac{35}{12}$

Option 3: $\frac{37}{12}$

Option 4: $\frac{12}{37}$

Question : Which of the following is used to chemically test starch?

Option 1: Chlorine solution

Option 2: lodine solution

Option 3: Sulphur solution

Option 4: Bromine solution

Question : The amount of chlorine available in water after disinfection is called as

Option 1: Free chlorine

Option 2: Residual chlorine

Option 3: Free available chlorine

Option 4: Combined available chlorine