Science MCQs

Drip irrigation targets the root zone directly while sprinkler irrigation wets the entire soil surface from above.

Mustard seeds are a common spice added to pickles for their distinct flavor and aroma.

Isopropyl alcohol is the active ingredient that effectively kills germs and microorganisms.

A hot iron nail is used to melt and create small holes in the bottom of the plastic bottle for water to sprinkle out.

A clean dry jar ensures no unwanted microbes are present to spoil the jam during storage.

The mixture needs time for all components to integrate fully and for hydrogen peroxide to neutralize any bacterial spores in the ingredients.

Thread is used to suspend the water-filled bottles at a height above the potted plants to create gravity-fed water pressure.

Acetic acid the main component of vinegar provides the characteristic sour taste in pickles.

Sealing the jar creates an anaerobic environment preventing the entry of air which carries spoilage microorganisms and oxygen that can degrade the food.

The Y-shaped tube splits the sound path from the single funnel into two separate paths leading to each ear.