Question : Lens is made up of:

Option 1: Pyrex glass

Option 2: Flint glass

Option 3: Ordinary glass

Option 4: Cobalt glass

Question : Which type of glass is used for making glass reinforced plastic ?

Option 1: Pyrex glass

Option 2: Flint glass

Option 3: Quartz glass

Option 4: Fibre glass

Question : What is an endothermic reaction ?

Option 1: Reaction in which heat is released

Option 2: Reaction in which heat is Absorbed

Option 3: Reaction in which neither heat is released nor absorbed

Option 4: None of these

Question : Alfalfa is the name of a kind of:

Option 1: Forest

Option 2: Crop

Option 3: Grass

Option 4: None of these

Question : What is the value of $x$ in the equation $\sqrt{\frac{1+x}{x}}-\sqrt{\frac{x}{1+x}}=\frac{1}{\sqrt6}$?

Option 1: –2

Option 2: 3

Option 3: 2

Option 4: None of these