What type of lens is used to correct nearsightedness (myopia)?

Which type of wave requires a material medium to travel and cannot propagate through vacuum?

Which vitamin deficiency causes pellagra characterised by dermatitis diarrhoea and dementia?

Which everyday device converts direct current into alternating current for household appliance use?

Which device converts electrical energy into light energy using a glowing filament?

What is the primary function of white blood cells?

Which gas is most abundant in the Earth's atmosphere?

Which part of the human ear converts sound vibrations into electrical signals for the brain?

What is the term for the study of weather patterns?

Which common property of water describes water molecules being attracted to each other through hydrogen bonds?

Which everyday process explains how noise-cancelling headphones work?