[ Question Bank ] - 2022 — Science STD 10 — Question

How many valence electrons are there in the outermost shell of silicon?

What type of chemical reaction is used to extract metals from their naturally occurring compounds like oxides or chlorides?

In the earlier class, you had prepared the solution of dry yeast for observation of yeast. Which substance is prepared by its use on commercial basis?

One wants to see a magnified image of an object in a mirror. What type of mirror should one use?

Mercury and…………are two metals in the liquid state at room temperature.

What are the female sex cells in humans called?

Which property of copper metal is utilised in making thin wires?

What is meant by the refractive index of a substance?

Which type of mirror is usually used as a rear-view mirror in motor cars?

What is the other name of sex cells?