Which common safety device in electrical circuits breaks the circuit when current exceeds a safe limit to prevent fires?

Which common food item is fortified with iodine in many countries to prevent deficiency related disorders?

Which simple machine uses a grooved wheel and rope to lift heavy objects with reduced effort?

Which membrane surrounds the lungs and reduces friction during breathing movements?

Which common kitchen tool functions based on the principle of a wedge to separate materials?

Which macronutrient is the body's primary and most efficient source of quick energy?