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.

Crystal size in igneous rocks is determined by rate of cooling i.e, the time taken by magma to cool down. 

Hence, the slower the rate of cooling the larger the crystals. The faster the rate of cooling the smaller the crystals.

The "Pradhan Mantri Shram-Yogi Maandhan" scheme was launched on 15-02-2019. Under the PM-SYM scheme, the workers will get amount of Rs. 3,000 pension after attaining the age of 60 years. 

Grameen Bank is a microfinance and community development bank first started in Bangladesh in the year 1983. By the name itself, it is mainly for the village people to give small loans (microcredit).

Government imposes taxes to run the machinery of the state. Taxes serve as the main source of income for the government revenue.