What type of balances are used in laboratories?

What types of waves are used in a SONAR ?

What type of toilets are used in aeroplanes?

(i) What type of drug is used in sleeping pills? (ii) What type of detergents are used in toothpastes? (iii) Why the use of alitame as artificial sweetener is not recommended?

What type of reflector is used in a box-type solar cooker ?

The normality of conc. HCl used in the laboratory is

What type of a propellant was used in Russian rockets such as proton?

Which barometer is generally used in laboratories to measure atmospheric quite accurately ?

Which of the following substance (s) is/are used in laboratory for drying purposes ?