Science MCQs

Baking a cake produces new substances irreversibly a chemical change.

Hydrocarbons contain only hydrogen and carbon atoms.

Crude oil (petroleum) is the primary source of hydrocarbons for fuels.

Combustion produces heat water vapor and carbon dioxide.

Fertilizers add essential minerals like nitrogen phosphorus potassium to soil.

NPK stands for Nitrogen Phosphorus and Potassium key fertilizer nutrients.

Excess fertilizers can run off into water bodies causing algal blooms and pollution.

Hydrogenation adds hydrogen to oil making it solid like Banaspati ghee.

Nickel is commonly used as a catalyst in the hydrogenation process.

Plastics are polymers made from many small repeating units called monomers.