Find the upcoming numbers in this series. 12, 43,

Which one of the following oxides reacts with both acid and base?

Which of the following is the ratio of Oxygen to Nitrogen in the air?

A man inside an artificial satellite feels weightlessness because the force of attraction due to earth is –

What is the most basic criteria used to decide whether something is alive?

Which is the longest bone in the human body?

Tungsten is used for the construction of filament in an electric bulb because of its 

‘Therm’ is the unit of –

A positively charged particle enters a uniform electric field directed downward. The force acting on the particle is:

Cathode rays when obstructed by metal cause emission of -

Stereo was invented by                .