Acids, Bases and Salts — Science STD 10 — Question

In which one of the following birth control methods, a small portion of oviducts of a woman is removed by surgical operation and the cut ends are ligated?

The animal which does not have eyes that look sideways is :

A soft iron bar is inserted inside a current-carrying solenoid. The magnetic field inside the solenoid:

The element with atomic number 14 is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?

How much of the net primary productivity of a terrestrial ecosystem is eaten and digested by herbivores?

A student is testing water to know which is best for cleansing purposes with soaps. He would find that the cleansing action of soaps is best when he uses water obtained from.

In a convex spherical mirror, reflection of light takes place at :

Which among the following elements has the largest atomic radii?

On adding zinc granules to freshly prepared ferrous sulphate solution, a student observes that

10mL of a solution of NaOH is found to be completely neutralised by 8mL of a given solution of HCl. If we take 20mL of the same solution of NaOH, the amount of HCl solution (the same solution as before) required to neutralise it will be: