Pakistan MCQs

Greenhouse gases reduce outgoing infrared energy loss.
Human emissions strengthen the natural greenhouse effect.

Polymers contain repeated structural units.
They may form by addition or condensation processes.

SO2 and nitrogen oxides form acids in the atmosphere.
Acid deposition can harm ecosystems and materials.

Addition polymerization opens double bonds without small-molecule byproducts.
Polyethene forms from ethene.

Carbohydrates include sugars, starch, glycogen, and cellulose.
Their biological roles include energy supply and structural support.

Condensation polymerization joins bifunctional monomers.
Water or another small molecule is often released.

Protein sequence determines folding and function.
Proteins act as enzymes, structures, receptors, and transporters.

The molecule has two carbons and an alcohol group.
The correct name is ethanol.

Enzymes lower activation energy and increase reaction rate.
They are selective for particular substrates and conditions.

The molecule has a two-carbon carboxylic acid chain.
Its IUPAC name is ethanoic acid.

The word 'happily' describes how the children played.
A word that modifies a verb in this way functions as an adverb.

Qualitative analysis determines what is present.
It may use color changes, precipitates, spectra, or instrumental signals.