Questions

Argon gas is used in fluorescent and incandescent light bulbs to stop the oxygen in the light bulbs from corroding the hot tungsten filament.

The use of argon in light bulbs prevents the evaporation of the tungsten filaments, which results in increased light bulb life.

Argon is also used to create an inert atmosphere for growing semiconductor crystals, arc welding and for processes that need protection from other kinds of atmospheric gases.

Group 1 metals are also called as alkali metals with reactive in nature and low melting points. They are soft and produce hydrogen and alkaline metal hydroxide solution when they react with water.

The idiom “blow off steam” means to express one’s anger, usually noisily and harmlessly, thereby relieving one’s tension. The above sentence states that one should not waste one’s time and utilise it in releasing negative energies to get charged up. Only option 1 goes with this meaning, hence option 1 is correct.

John Shepherd-Barron was the inventor of ATM (automated teller machine), which was opened on 27th June, 1967 by Barclays bank.

2016 Australian Open –Men's Singles. Novak Djokovic was the defending champion and successfully defended his title, defeating Andy Murray, 6–1, 7–5, 7–6 in arematch of the previous year's final, and the fourth Australian Open final between the pair.