Question

choose the correct alternative for the following.....:::

Answer 1

5) ( b) electrical to machenical .
4) (a) nitrogen

Answer 2

1. Nitrogen gas is used in bulbs. Hence option (a) is correct.
2. Energy transformation in a washing machine is from electrical energy to mechanical energy. Hence option (b) is correct.

EXPLANATION:

• Nitrogen gas is used in electric bulbs because it does not react with the tungsten filament.
• Nitrogen gas maintains an inert atmosphere they prevents the evaporation of filament and helps in reducing its oxidation.
• Halogen gases such as chlorine or oxygen would corrode the heated filament on contact hence they are not used in light bulbs.
• Hydrogen gas has high thermal conductivity hence they are not suitable to use in general lighting.
• In washing machine, electrical energy is converted to rotational kinetic energy or mechanical energy
• The washing machine is a device that is used to wash clothes. The washing machine has a wash tub that rotates in a circular direction with dirty clothes, water, and detergent in it. This movement removes dirt or stain from the clothes.

Hence Nitrogen gas is used in electric bulbs and energy transformation in washing machine is from electrical energy to mechanical energy.

#spj3