Which one of the following pairs of materials serves as electrodes in chargeable batteries commonly used in devices such as torch, electric shavers etc?

Physico-chemical characteristics of water in water sources undergo changes due to

Which of the following statements are correct?
(a) Teflon and dacron are polymers
(b) Neoprene is synthetic rubber
(c) Polythene is polyethylene polymer
(d) Natural rubber is chloroprene

The alpha particle carries two positive charges. Its mass is very nearly equal to that of

Which one of the following elements is alloyed with iron to produce steel which can resist high temperatures and also have high hardness and abrasion resistance?

The characteristic odor of garlic is due to

Sulphuric acid is used in the manufacture of
(a) Fertilizers
(b) Dyestuff intermediates
(c) Pigments and paints
(d) Storage batteries

The most reactive among the halogens is

The offending substance in the liquor tragedies leading to blindness etc, is

The difference between a nuclear reactor and an atomic bomb is that