The most reactive of the halogens

A sudden drop in barometric pressure indicates which of the following?

Which of the following is not an insulator?

For a non-relativistic particle, the ratio of phase velocity to group velocity of de Broglie waves is:

Which device measures temperature?

Gauss's law is applicable only to:

Compared to fresh Water, the freezing point of sea water is -

An electric bulb is rated 100 W and 220 V. What is the current through the bulb?  

Which of the following particles in motion, having the same kinetic energy, has the shortest wavelength?

Which among the following nuclei is more stable based on neutron-to-proton ratio?